Entel hx400 SM v2.10 - 2 PDF

HX400_Manual_V2 00.
doc
CONTENTS
1. INTRODUCTION.............................................................................................................................5
1.1. MODEL NUMBERS ......................................................................................................................5
2. ITEMS SUPPLIED ..........................................................................................................................5
2.1. ACCESSORIES .......................................................................................................................6
3. OPERATING THE RADIO ..............................................................................................................7
4. THEORY OF OPERATION.............................................................................................................7
4.1. THE MICROPROCESSOR ......................................................................................................7
4.1.1. Microprocessor I/O Signals...............................................................................................8
4.1.2. Switch Operation ..............................................................................................................9
4.1.3. Backlights .........................................................................................................................9
4.1.4. Microprocessor Clock and Beat Shift Function.................................................................9
4.1.5. Microprocessor Reset.......................................................................................................9
4.1.6. Discrete Control Signals .................................................................................................10
4.2. AUDIO AND TONE SIGNALLING CIRCUITS ........................................................................11
4.2.1. Received Voice Audio Processing..................................................................................11
4.2.2. Received Tone Processing.............................................................................................12
4.2.3. Transmit Audio Processing.............................................................................................12
4.2.4. Transmit Tone Processing..............................................................................................13
4.3. SYNTHESIZER SECTION .....................................................................................................14
4.3.1. Reference Oscillator .......................................................................................................14
4.3.2. Voltage Doubler. .............................................................................................................15
4.3.3. Loop Filter.......................................................................................................................15
4.3.4. Transmit VCO .................................................................................................................15
4.3.5. Receive VCO ..................................................................................................................15
4.3.6. VCO Power Switching and Buffering ..............................................................................16
4.4. RECEIVER SECTION............................................................................................................17
4.4.1. Antenna Transmit/Receive switching circuit. ..................................................................17
4.4.2. First RF Filter ..................................................................................................................17
4.4.3. RF Amplifier ....................................................................................................................17
4.4.4. Second RF Filter.............................................................................................................18
4.4.5. Mixer Circuit....................................................................................................................18
4.4.6. First IF Filter....................................................................................................................18
4.4.7. First IF Amplifier Circuit ..................................................................................................18
4.4.8. Second LO Tripler Circuit ...............................................................................................18
4.4.9. Second IF Circuit (FM IF IC)...........................................................................................19
4.4.10. Noise Squelch Detector ..............................................................................................19
4.5. TRANSMITTER SECTION.....................................................................................................21
4.5.1. Low Power Transmit Amplifier ........................................................................................21
4.5.2. Transmit Driver Amplifier ................................................................................................21
4.5.3. Final Power Amplifier......................................................................................................21
4.5.4. PA Switching Circuit. ......................................................................................................22
4.6. POWER SUPPLY ..................................................................................................................23
4.6.1. Battery connections and Protection circuit......................................................................23
4.6.2. Main Regulator ...............................................................................................................23
4.6.3. Transmit and Receive Power control circuit ...................................................................23
4.7. MISCELLANEOUS FUNCTIONS...........................................................................................23
4.7.1. Switches. ........................................................................................................................23
4.7.2. Indicators. .......................................................................................................................23
4.7.3. Volume Control. ..............................................................................................................24
4.7.4. Battery Monitoring...........................................................................................................24
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HX400_Manual_V2 00.doc
5. DISASSEMBLY ............................................................................................................................25
5.1. ATTACHING AND REMOVING THE BATTERY PACK ......................................................................25
5.2. DISASSEMBLING THE RADIO......................................................................................................25
5.3. REASSEMBLING THE RADIO ......................................................................................................26
5.4. VISUAL AND MECHANICAL INSPECTION. ....................................................................................26
6. TESTING AND PROGRAMMING SETUP....................................................................................28
7. SPECIFICATIONS ........................................................................................................................29
8. PARTS LISTS...............................................................................................................................30
8.1. CONTROLLER AND PROCESSOR PEC PARTS LIST .....................................................................30
8.2. RF PEC PARTS LIST - HX42X VHF MODELS ...........................................................................34
8.3. RF PEC PARTS LIST - HX48X UHF MODELS...........................................................................40
8.4. RF PEC PARTS LIST - HX41X 66-88MHZ MODELS .................................................................40
8.5. MECHANICAL PARTS LIST AND EXPLODED VIEW – HX4X2 MODELS ..........................................52
8.6 MECHANICAL PARTS LIST AND EXPLODED VIEW – HX4X3 MODELS……………………………...53
9. CIRCUIT DIAGRAMS ...................................................................................................................56
FIGURES
Figure 4.1 Synthesizer Block Diagram .................................................................................................14
Figure 4.2 Receiver Block Diagram......................................................................................................17
Figure 5.1 Exploded View ....................................................................................................................25
Figure 6.1 Test & Programming Setup.................................................................................................28
Figure 7.1 Specifications ......................................................................................................................29
Figure 9.1 Controller and Processor PEC Circuit Diagram Sheet 1 – All Models ................................57
Figure 9.2 Controller and Processor PEC Circuit Diagram Sheet 2 – All Models ................................58
Figure 9.3 Controller and Processor PEC Circuit Diagram Sheet 3 – All Models ..............................599
Figure 9.4 RF PEC Block Diagram – All Models ..................................................................................60
Figure 9.5 Synthesiser Circuit Diagram – VHF Models........................................................................61
Figure 9.6 VCO Circuit Diagram – VHF Models...................................................................................62
Figure 9.7 Receiver Circuit Diagram – VHF Models ............................................................................63
Figure 9.8 Transmitter Circuit Diagram – VHF Models ........................................................................64
Figure 9.9 Synthesiser Circuit Diagram – UHF Models........................................................................65
Figure 9.10 VCO Circuit Diagram – UHF Models.................................................................................66
Figure 9.11 Receiver Circuit Diagram – UHF Models ..........................................................................67
Figure 9.12 Transmitter Circuit Diagram – UHF Models ......................................................................68
Figure 9.13 Synthesiser Circuit Diagram – 66-88MHz Models ............................................................69
Figure 9.14 VCO Circuit Diagram – 66-88MHz Models .......................................................................66
Figure 9.15 Receiver Circuit Diagram – 66-88MHz Models .................................................................67
Figure 9.16 Transmitter Circuit Diagram – 66-88MHz Models .............................................................72
Figure 9.17 HX42x RF Board, TOP VIEW ...........................................................................................73
Figure 9.18 HX42x RF Board, BOTTOM VIEW ................................................................................ 74
Figure 9.20 HX48x RF Board, BOTTOM VIEW ...................................................................................76
Figure 9.22 HX41x RF Board, BOTTOM VIEW ..................................................................................78
Figure 9.23 HX4Xx Control, TOP VIEW …………………………………………………………………….79
Figure 9.24 HX4Xx Control Board, BOTTOM VIEW ………………………………………………………80
Page 3 of 80
TABLES
Table 2.1 Items Supplied........................................................................................................................5
Table 2.2 Accessories ............................................................................................................................6
Table 4.1 Microprocessor Input Signals .................................................................................................8
Table 4.2 Microprocessor Output Signals ..............................................................................................8
Page 4 of 80
INTRODUCTION
The Entel HX400 Series 2 is a PMR handheld two-way VHF/UHF/MB transceiver. It is of heavy
duty, commercial grade construction exceeding MIL-STD 810/C/D/E/F, with up-rated IP55 splash
proof protection.
It is constructed with a microprocessor controlled, temperature compensated Phase Locked Loop

(PLL) frequency synthesizer. Depending on the version, it has either 16 or 255 programmable
channels. Some versions also have an LCD display and Keypad.
The radio features a double conversion receiver and a direct FM transmitter modulator.
A special integrated circuit provides support for sub-audible signalling (all CTCSS & DCS tones).
The transceiver includes the following features:

• Scan mode.
• Four programmable buttons.
• VOX (voice operated transmit).
• Easy-to-read LCD display (depending on version).
• EEPROM memory back-up.
• Stored and/or Keypad DTMF dialling (depending on version).
The battery uses Lithium-ion technology for long life. The Battery system also incorporates a
battery level indicator, a low battery warning bleep/flashing LED, and a built in charge cycle
counter.
The Radio also has an extensive range of accessories.
1.1. Model Numbers

The HX400 Series 2 transceivers are available in many different configurations. Advanced
functions will also depend on model type. Part Number Identification is as follows:
HX42x are VHF models.

HX48x are UHF models.
HX41x are 66-88MHz models
HX4x2 have no display or keypad

HX4x3 have an LCD display but no keypad
HX4x5 have an LCD display and simple 8 button keypad
HX4x6 have an LCD display and full 20 button keypad
2. ITEMS SUPPLIED
Items Model Quantity

Radio HX4xx 1
Antenna CATxx 1
1700mAh Li-Ion battery pack CNB450E 1
Spring loaded belt clip CBH450 1
Intelligent rapid charger* CSAHX 1
User guide UG400 1
Table 2.1 Items Supplied
* CSAHX (only supplied with HX4X2, HX4X2S & HX4X3 models)
Page 5 of 80
2.1. ACCESSORIES
The HX400 Series is supported by a wide range of useful accessories.

For an up to date list visit the Entel web site at www.entel.co.uk
CSAHX 1-way dual slot rapid charger, 110/230v operation

CSBHX 6-way dual slot rapid charger, 110/230v operation
CFC450 Soft leather carry case with strap & Belt loop
CFC456 Soft leather carry case with strap & Belt loop
CLC452 Hard leather carry case with strap & Belt loop
CBH450 Spring loaded belt clip
CMP1/450 Compact medium duty speaker microphone with earpiece jack
CMP450 Heavy duty submersible speaker microphone
EHP9 D-shaped earpiece (plugs into CMP1/450 or CMP450 above)
Tattoo Lightweight Bluetooth earpiece/microphone
X3 Durable, water resistant Bluetooth earpiece/microphone
M10 Ultra small Bluetooth earpiece/microphone
BTPPT Small Bluetooth remote press to talk button
EA12/450 D-shaped earpiece with in-line PTT/microphone & VOX*
EA15/450 Earpiece microphone with transparent acoustic tube & VOX*
EA19/450 D-shaped earpiece with boom microphone and in-line PTT & VOX*
EPH450 D-Shaped earpiece (connects directly to radio)
EPT40/450 Bone conductive earpiece microphone with PTT
CXR5/450 Bone conductive skull microphone with in-line PTT
CXR16/450 D-shaped earpiece and throat microphone with in-line PTT
CHP1/750 Light weight single earpiece headset with in-line PTT &VOX*
CHP450HS Single earpiece ear defender headset with boom Mic and in-line PTT for hard
hat &VOX*
CHP450HD Double earpiece defender headset with boom Mic and in-line PTT for hard hat
&VOX*
CHP450D Double earpiece headband defender headset with boom Mic and in line PTT
&VOX*
CHP450BT Bluetooth double earpiece headband defender headset with boom Mic and ear
cup PTT
* VOX = Voice Operated Transmit (hands free operation)
CXW400 Antenna adapter for external aerial connection
CAT420 Helical antenna VHF
CAT480 Whip antenna UHF
CAT480S Stubby antenna UHF
CAT410-78 78MHz compressed antenna
CAT410-85 85MHz compressed antenna
CAT410-Full/Y 66-77MHz full length antenna
CAT410-Full/G 77-88MHz full length antenna
CAT400-40 30-50MHz antenna
Table 2.2 Accessories
Page 6 of 80
3. OPERATING THE RADIO
For operating instructions, please refer to the User Manual as supplied with each radio. A
description of the controls and indicators is given in that document.
4. THEORY OF OPERATION
The transceiver is constructed on two main printed circuit boards; one containing the
Microprocessor and Audio circuits, and the other containing the Synthesiser, Transmitter and
Receiver circuits.
In order to describe the circuit operation of the radio, the description has been broken down to the
principal functional sections. They are:
1. The Microprocessor.
2. The Audio and Signalling circuits.
3. The Synthesizer.
4. The Receiver.
5. The Transmitter.
These are described, in turn, in the following sections.
4.1. THE MICROPROCESSOR
The heart of the radio is the uPD78F0547 microprocessor (IC5), which is a flexible, powerful, low
consumption device.
IC5 (uPD78F microprocessor) and IC4 (a 1Mbit-SPI-Bus Serial EEPROM) work together holding
all the information that is needed to program any of HX400 series models.
Shared between the internal memory in IC5 and the external serial EEPROM is all the data
needed to make the radio function, including dealer programmed data.
IC5 and IC4 communicate via a 2 wire serial bus.
IC5 IC4 R207 R210
According to the model, the Firmware provides instructions concerning the use of display (or not),
keypad (or not), number of channels, Selective Calling, etc.
According the dealer’s programming, the memories contain data such as:
Channel information including frequency, Squelch type, sub-tones, TX power level, frequency
spacing, the function of the programmable buttons, alignment data such as power levels,
sensitivity, centre frequency, deviation limits, etc..
In the models with a display (HX43x, HX45x and HX46x), the microprocessor (IC5) drives the
segments of the display via the connector CON4.
Page 7 of 80
In the models with keypads, IC5 also reads the tactile keypad matrix formed by switches SW1 to
SW25 as described below.
The microprocessor outputs Beeps and warning tones on pins 48 and 49, these are summed into
the receive and transmit audio paths via an attenuator and summing network.
R50 R51 R10 R41 C11 C6 C7 C22
4.1.1. Microprocessor I/O Signals.
The following is a list of input signals to IC5 and their meaning:
7041_IRQN Interrupt Request from the CMX7041 Audio Processor

BUT_OUT_0 to 4 State (pressed or not) of the various switches
ENCODER0 to 3 LSB to MSB from the BCD encoder channel switch.
PTT Output from the internal PTT switch
EXT_PTT Keying the radio from the ACC connector, instead of the internal PTT
PLL_LD Condition of lock state of the synthesizer
RXD Programming data from an external PC
SW_BAT Battery Voltage from the On/Off switch
RSSI Received Signal Strength Indicator, from the IF sub-system in the RX
SQL Noise Squelch output voltage from the IF
VOL Voltage, between 0.5 and 4.5V, from the Volume Control pot
VOX Signal proportional to voice volume, used to operate the TX in VOX mode
BAT_COM Serial information from/to the IC contained within the battery
Table 4.1 Microprocessor Input Signals
The following is a list of output signals from IC5 and their meaning:
BUT_IN_0 to 4 The state (pressed or not) of the various switches

CS1 Chip Select external serial EEPROM IC4
CMX_OFF Switches OFF the 3.6V regulator which feeds CMX7041
7041_CSN C:BUS Chip Select for CMX7041
PLL_EN Enable for the synthesizer serial data
TX_LED Switch on the red LED indicating TX mode
RX_LED Switch on the green LED indicating RX mode
W/N Selects Wide/Narrow filters in the RX
DA_LE Serial Data to the D/A converter
RS, PW_WR, E_RD, Signals to drive the display in models 3, 5 & 6
DB7 to DB0
POWER_EN Switches ON the voltage SWB+
BACK_LIGHT Switches the illumination of the display in models 3, 5 & 6.
VCO_CON Selects TX or RX VCO
TXD Programming Data to an external PC
TX_EN Signal to switch on the TX circuits
RX_EN Signal to switch on the RX circuits (exclusive with TX_EN)
MIC_EN Enables the microphone
MUTE Mutes the Audio output from the Audio PA
IC_DATA Serial data for the Audio Proc., D/A, Synth & EEPROM.
IC_CLK Clock for loading the serial data
Table 4.2 Microprocessor Output Signals
Page 8 of 80
4.1.2. Switch Operation
Mechanical SPST switches SW1, SW2 & SW4 on the RF Board, tactile switches on the Controller
Board, and the Keypad (where fitted), are arranged in a matrix form.
Signals BUT_IN_0 to 4 are sent in a sequence. Once a switch is activated (depressed) the
microprocessor determines which one according to the “cross-point” of the switch involved
(BUT_IN_x with BUT_OUT_y). The combination XY gives the pressed button.
The functions of the keys, other than the PTT, are dealer programmable and are stored in the
memory of the radio.
SW1 TO SW19, SW25, R133 R106 R83 R61 R63

RF board SW1 to SW3
4.1.3. Backlights
LEDs are used to backlight the keypad and Display (where fitted).
Q16 and Q2 switch the keypad LEDs under control of the microprocessor BACK_LIGHT signal.
Q16 Q2 R3 R12 R125 R126 D15 TO D20
Q1 and Q49 switch the display LEDs via R265 and pin 17 of CON4.
Q1 Q49 R265
4.1.4. Microprocessor Clock and Beat Shift Function
The Microprocessor clock frequency (15.36MHz) is controlled by XT2 and associated

components.
The Beat Shift function allows a small change to be made to the clock frequency. This may move
unwanted spurious signals away from a wanted receive frequency.
Q3 when switched on by the BEAT_SHIFT signal from the Microprocessor by-passes C96 so
changing the clock frequency controlled by XT2.
Q3 R62 R22 R64 C96 C95 C10 XT2
4.1.5. Microprocessor Reset
R84 and C193 provide a short power-on-reset for the microprocessor (RESET) when the 5V
supply turns on.
R84 C193
Page 9 of 80
4.1.6. Discrete Control Signals
Other signals are generated by IC9 (M62364) under microprocessor control. These signals are:
• TX_PWR Transmit Power Level

• RX_FIL Tuning voltage for the front end filters
• FREQ_CON VCXO fine tuning
A fixed DC voltage is applied to pins 1, 4 & 9 of IC9. According to the data sent by the
microprocessor to IC9, via the serial data link, the dc voltage at the corresponding output pins 5, 2
& 3 is set to the required level.
Pin 2 is the reference for the power control loop on the RF Board and sets the TX output power.
The output at pin 3 is the tuning voltage for the RF filters in the receiver on the RF Board, this
varies with the receive frequency.
The voltage at pin 9 is the fine tuning voltage for the Voltage Controlled Crystal Oscillator
reference (VCXO) on the RF Board. When the radio is aligned, fine tuning of some parameters
can be done with the help of the Radio Performance Facility in the software. One of those
parameters is the radio’s centre frequency. Programming the FREQ_CON signal allows the centre
frequency to be accurately adjusted.
IC9 R29 R30 R31
Page 10 of 80
4.2. AUDIO AND TONE SIGNALLING CIRCUITS
The majority of the functionality concerned with Audio and Signalling is accomplished within the
CMX7041Audio Processor (IC3). Some external op-amps also provide buffering and filtering.
The CMX7041 performs simultaneous processing of sub-audio and in-band signalling and audio-
band processing (including frequency inversion scrambling, companding and pre- or de-
emphasis). Other features include a complete FFSK/MSK modem for packetised or free-format
data, two Auxiliary ADC channels with four selectable inputs and up to four auxiliary DAC
interfaces.
The Audio processor is clocked by Crystal XT4 at 19.2 MHz.
Functionality may be divided into Transmit and Receive paths.
Each of those paths may be further sub-divided into:
Voice audio
Tone Signalling audio
4.2.1. Received Voice Audio Processing
The unfiltered audio from the discriminator on the RF Board enters the Controller board via pin 7 of
CON2. This audio is amplified (in IC6A) and FLAT_AUDIO_2 enters IC3 (CMX7041) at pin 16.
Here it is further amplified and high-pass filtered to remove the sub-tones at frequencies below
260Hz.
IC6a R194 R192 R195 C168 C217 C107 C218 IC3
The filtered audio signal leaves IC3 at pin 26 (Audio Out), de-emphasis is applied by R176 & C208
(AUDIO_IN). The audio is buffered by IC6B before reaching pin 24 of IC9 ( VOL1). This is where
the volume control takes place. According the position of the Volume Control Potentiometer (RF
Board) the microprocessor sends the required data to the multiplying D/A (IC9) to set the audio
level at pin 23 (VOL2).
R176 C208 IC6b R209 R42 R67 R66 R49 C222 C13 C87
IC9
Volume controlled audio is then further amplified, audio PA IC, U1, and then applied to either the
internal or the external Loudspeaker.
C2 C4 R6 R7 R8 R9 R13 R14 L1 L2 C35 C3 R57 L9 C15

C35 C36
U1 is dual audio amplifier, with low stand-by consumption and mute capability. The balanced audio
output (bridge connection of both amplifiers) for the internal speaker is taken from pin8 (OUT2+)
and pin 13 (OUT2-). Muting of this signal is achieved by transistor Q11. The AUDIO_MUTE signal
from the Microprocessor silences the audio from the internal speaker.
Page 11 of 80
The balanced audio output of U1 (bridge connection of both amplifiers) for the external speaker is
taken from pin3 (OUT1+) and pin 18 (OUT1-). Muting of this signal is achieved by transistor Q5.
The MUTE digital signal from the
Microprocessor silences the audio from the external speaker.
Q5 R45 R19 R21 C37
4.2.2. Received Tone Processing
IC3 also contain the necessary circuitry to low-pass filter and detect sub-tones or Digitally Coded
Squelch data (CTCSS or DCS) in the incoming audio at pin 16. Once a valid sub-tone or DSC data
(corresponding to the programming) is detected, IC3 communicates that to the microprocessor via
the serial data link, which in turn un-mutes the RX audio.
IC3 IC5
4.2.3. Transmit Audio Processing
Voice from the internal microphone enters the board via pin 10 of CON (INT_MIC). The external
microphone signals (EXT_MIC) enters the unit via pin 6 of CON1. Microphone signals are enabled
by switching transistor Q39 under the control of microprocessor signal MIC_EN. D7 is a limiter to
prevent excessively large signals from overloading the Microphone input.
Q39 R138 R53 C105 C102 C104 C98 L25 L34 D7 R52
The Mic audio (now labelled MIC_IN) is amplified and filtered in IC6D and re-named MIC_PROC
before reaching IC3 at pin 21 (Mic). The CMX7041 is capable of high-pass filtering the incoming
audio (to avoid interference between the low frequency content of the voice and the locally
generated sub-tones) and also applying pre-emphasis (6dB/octave), and to limit the level of the
voice to prevent over deviation. Processed audio leaves the IC3 at pin 23 (MOD1).
IC6d C121 C17 C18 R85 R86 R68 IC3
Levelled audio is further filtered and buffered by IC14b (MOD_AUDIO).
IC14b R175 R178 R179 R43 R183 R197 C205 C206

C207 C212
Voice from IC14b (MOD_AUDIO) is applied to IC9 pin 21where the level is set to provide the
correct deviation, as programmed by the microprocessor, and leaves the IC at pin 22 via R16, R17
& C26 to be added to tones used for selective calling. The main modulating signal is MOD_OUT1
and leaves the board via pin 35 of CON2 (MOD_OUT1) to modulate the TX VCO.
IC9 R18 R40 R26 R27 C16
IC102 and its associated components form a band-pass filter tuned around 800Hz, where the
voice has the maximum energy content. The audio is amplified and full wave rectified by D222, so
producing a DC signal (VOX) proportional to the voice level from the microphone. This signal is
measured by the Microprocessor and the decision whether to put the radio into TX Mode is taken,
depending on the programmed VOX threshold level.
Page 12 of 80
The whole VOX detector circuit is enabled by Q21 under control of the microprocessor signal
VOX_EN.
IC102 Q21 C1 C99 C100 C65 C103 C101 C130 D222 R78
R79 R80 R75 R76 R82 R157
4.2.4. Transmit Tone Processing
IC3 contains the circuits necessary to generate the sub-tones or DSC data (CTCSS or DCS). The
microprocessor controls IC3, via the serial data link, to produce the programmed sub-tone or data
stream. They leave IC3 via pin 24 (MOD2). The sub-tones are then further low pass filtered and
buffered by IC14a (MOD_TONE.)
IC3 IC14a R172 R107 R108 R109 R115 R191 R116 C204
C139 C135 C174 C187 C192
The sub-tones from IC14 (MOD_TONE) enter IC9 at pin 13. IC9 is an M62364 8 Channel
Multiplying D/A Converter with serial data input. Data is stored in an internal register and is used to
convert the voltages applied to the input pins to new voltages at the output pins.
The microprocessor sets the level out of IC9 via the serial data link. The output from IC9 (pin 14
via R35), is the sub-tone modulating signal (MOD_OUT2). This leaves the board at pin 34 of
CON2 to modulate the VCXO reference oscillator. This technique is called “two-point modulation”,
and is very powerful because the low frequencies, which require a relatively low level of
modulation, modulate the reference oscillator, and are “inside” the natural frequency of the loop of
the PLL, whist the higher frequencies (over 260Hz) modulate directly the VCO. Those frequencies
are “outside” the natural frequency of the loop, so the loop filter does not attenuate the modulation.
IC9 R40 R18
The tones inside the audio band are generated by IC9. The DC voltage applied to pin 12 is
converted to a tone by varying the applied serial data. This tone is attenuated and added to the
voice signal via R32, R33 and C23to produce the combined MOD_OUT1 as described above.
IC9 R32 R33 C23
Page 13 of 80
4.3. SYNTHESIZER SECTION
The synthesizer section comprises a MB15E03SL synthesiser IC, a reference oscillator (VCXO),
a loop filter, a Transmit VCO, a Receive LO, the supply switching to enable either of the VCO’s,
and a common output buffer amplifier.
The Synthesiser IC and VCXO run from a 3V supply derived from the +5V supply by R262 and
D29.
IC13 VCXO D29 C265 R262 R129 R213
A technique used in this radio is the dual point, or cross point method, of modulation of the
Reference Oscillator (TCXO). This permits modulation of low frequencies (such as CTCSS) on to
the carrier, that otherwise would require an extremely low frequency modulation of the VCO,
which in turn would require a high loop bandwidth that is not consistent with good spurious
rejection.
Ref. Ref.
Osc Div.
Phase Loop
Comp Filter
Pre- N/N-1
Scaler Div.
VCO
VCO
Buffer
Figure 4.1 Synthesizer Block Diagram
The MB15E03 chip contains the Phase Comparator, the Reference Divider, the Prescaler
Divider, the 11 bit Programmable Divider, and the 7 bit Swallow Divider.
The phase comparator output takes the form of two signals, P and R, the proper combination of
these signals is the source of the tuning voltage for the VCO (VCO_TUNE). Because the signals
P & R are in the range of 0 to 3V, and the varicaps diodes need a larger voltage to cover the
whole band, a voltage doubler is used to produce a 12V rail.
4.3.1. Reference Oscillator
The Reference Frequency for the Synthesiser is divided down from a stable Voltage Controlled
Crystal Oscillator (VCXO) running at 15.3 MHz. The exact frequency of the VCXO may be set
with the control voltage FREQ_CON as described in Section 4.3.
The VCXO output is applied to the Synthesiser IC at pin 1 via R212 and C67. A tap is also taken
to feed the frequency tripler for the 2nd Local Oscillator.
Page 14 of 80
The VCXO is also modulated by low frequency Tone signals. These are buffered in IC8b and
then summed together with the fine tuning signal FREQ_CON in IC8a. The resulting signal is
applied to the VCON input of the VCXO.
VCXO IC8 C74 C100 C73 C170 C67 C145 R54 R39 R40
R85 R48 R184 R221 R206 R128 R212R213
4.3.2. Voltage Doubler.
Q30, Q31 and associated components form an astable oscillator, Q32, 33 & 34 form a buffer to
feed the voltage doubler formed by D8 & D13. A voltage of around 12V is generated to feed the
voltage pump.
Q30 to Q34 R155 R148 R150 R153 R151 R152 R156 C37
C38C62 C39 C40 C97 C140 C150 D8 D13
The Voltage pump is formed by Q11, 27, 28 & 29 and associated components. The function of
the pump is to convert levels between 0-3V from IC13 to levels between 0-12V. Transistors Q11,
27, 28 & 29 are switched on and off by signals P & R, the combined signal is taken from the
collectors of Q28 and Q29 and then fed to the Loop Filter.
Q11 Q27 Q28 Q29 R30 R31 R25 R42 R144 R147 R19
R24 R145 R146 C132
4.3.3. Loop Filter

The loop filter takes the variable pulse width outputs from the Voltage Pump and low pass filters
them to give a DC voltage to control the selected VCO (VCO_TUNE). A Test Point (TP) is
provided via R53 for the monitoring of the VCO control voltage.
R28 R29 R168 R53 C33 C41 C68 C160
4.3.4. Transmit VCO
Q4 (Q502_MB) and its associated circuits form the TX local oscillator, the resonant circuit is
composed of L40, C5, C19, C42, C162, C250, TC2 (L511, C45, C259, C533, C534 _MB) and the
varicaps diodes D3 & D15 (D501 & D502 _MB). The variable capacitance of these diodes tunes
the oscillator to the correct frequency as determined by the synthesizer.
The VCO control voltage from the synthesizer (VCO_TUNE) is applied to D3 (D502_MB); this is
the main tuning element and determines the frequency of oscillation. Modulation for voice and in-
band tones is applied to D15; this frequency modulates the RF output. Low frequency tone
modulation is applied directly to the Reference Oscillator (VCXO).
VHF-UHF Q4 D3 D15 C251C188C250 C163 C164 C162 C19 C5 C42

C59 C263 TC2 R174 R201 R8 L3 L43 L40 L20
66-88MHz Q502 D502 D503 C45 C259 C533 C534 C540 R535 R536
R502 L3 L4 L509 L512
4.3.5. Receive VCO
Q26 (Q501_MB) and its associated components form the RX local oscillator, the resonant circuit is
composed of L41, C21, C23, C24, C248, C87, TC3 (L507, C522, C520, C523, L503, R532,
R533_MB) and the varicaps diodes D4, D26 & D32 (D501 _MB).
Page 15 of 80
The variable capacitance of these diodes tunes the oscillator to the correct frequency as
determined by the synthesizer.
The VCO control voltage from the synthesizer (VCO_TUNE) is applied to the varicap diode
network D4, D26 & D32 (D501 _MB).
VHF-UHF Q26 D4 D26 D32 C249 C21 C87 C23 C248 C24 C34 TC3 R22 L24 L4
L41 L5
66-88MHz Q501 D501 C522 C520 C523 R524 R534 RL502 L503 L508 R532
R533
4.3.6. VCO Power Switching and Buffering
The VCO_CON signal determines which VCO is enabled. Transistors Q36, 37, & 52 provide the
necessary switching of the positive supply.
VHF-UHF Q36 Q37 Q52 C45 C154 C155 C84 C77 R161 L42 L43
66-88MHz Q36 Q37 Q52 C1 C95 C503 L508 L509
A sample of the RF signal from the enabled oscillator is routed to the buffer amplifier, Q35
(Q4_MB), then through C159/R167, to the prescaler input of the Synthesizer IC (IC13 pin 8).
VHF-UHF Q35 C17 C156 C157 C159 R167 R21 R45 R37 R47 L22
66-88MHz Q4 C17 C156 C157 C159 R167 R21 R45 R37 R47 L22
Depending on the state of TXB+ and RXB+, the signal from the buffer Q35 is also routed either via
PIN diode D9 to Q10 to feed the RX mixer (RX mode), or via D12 to Q43 to drive the RF power
amplifier chain (TX Mode).
RX Mode.
When the radio is in Rx mode, RXB+ voltage is present, but TXB+ is not. Consequently Q10 is
powered and D9 conducts, providing a low impedance path to the base of Q10. Q10 amplifies and
buffers the RX Local Oscillator signal providing an output at TX_LO.
Since TXB+ is absent, D12 is in an “off” condition, so there is high impedance to the base of Q43,
and Q43 is also not powered. Consequently there is no output at TX_LO.
Q10 D9 C26 C252 C253 C245 R58 R164 R43 R44 R143
R246 L44
TX mode.
In TX mode the opposite conditions exist; TXB+ is present and RXB+ is not. So Q43 is powered
and Q10 is off. Consequently there is a signal at TX_LO but not at RX_LO.
Q43 D12 C255C256 C30 C83 R162 R165 R160 R248

R249 L45
Page 16 of 80
4.4. RECEIVER SECTION
The receiver is a dual conversion super-heterodyne design with a first intermediate frequency (IF)
of 46.35MHz and a second IF frequency of 450 kHz. The receiver consists of a First RF Filter, a
RF amplifier, a second RF Filter, a first mixer, first IF Filter, an IF amplifier, and an FM IF IC with
associated 2nd IF ceramic filter and discriminator. Audio output from the demodulator is fed to the
Audio circuits as previously described.
Quadrature
Detector
Resonator
Crystal
T/R RF R RF Filter
FM IF System
IF
Switch Filter F Filter 46.35MHz IC Audio
out
Ceramic
X3 Filter
st 15.3MHz Multiplier nd
450kHz
1 LO 2 LO
45.9MHz
Figure 4.2 Receiver Block Diagram
4.4.1. Antenna Transmit/Receive switching circuit.
In the transmit mode TXB+ is applied to the diodes D6-D21 (D6, D701 & D710 _MB) via R33/L15
(R705/L711 _MB), forward biasing both diodes into an "on", conducting, state. The series diode D6
provides a low impedance path from the PA to the antenna. The shunt diode(s) D21 (D701-D710
_MB) shorts the receiver input, RX_IN, protecting the Low Noise Transistor Q5 from damage.
In the receive mode, neither of the diodes are conducting, both are “off”, creating a low impedance
path between the antenna (ANT), and receiver input, (RX_IN) and a high impedance path to the
PA.
VHF-UHF R33 C54 L15 L7 D6 C21

66-88MHz R705 C754 L708 L711 D6 C701 D710
4.4.2. First RF Filter

The next stage is the first RF Filter, which has a pass band characteristic; the centre frequency is
tuned by the voltage on the RX_FIL line which is applied to varicaps diodes D19, D20.
VHF units D19 D20 C82 C60 C35 C76 C51 C146 L19 L16 R142 R141
UHF units D19 D20 C147 C58 C274 C76 C146 L18 L5 R142 R141
66-88MHz D703 C703 C727 C729 C712C732 C704 C761 L704 L705 R702
4.4.3. RF Amplifier
The next stage is the first RF Amplifier Q5. The DC power for this stage is provided from RXB+.
VHF units Q5 C27 C10 C58 R139 R17 L7

UHF units Q5 C69 C14 C28 R1 R18 L1
66-88MHz Q5 C733 R717 R708 R706 R707 R710 L713
Page 17 of 80
4.4.4. Second RF Filter
The next stage is the second RF Bandpass Filter, which also has a pass band characteristic,
tuned by the voltage on the RX_FIL line.
VHF units D11 D10 C75 C29 C266 C56 C72 L13 L18 R140 R1
UHF units D11 D10 C56 C51 C43C143 L35 L18 L6 R140 R139
66-88MHz D704 C706 C734 C767 C768 C707 L706 L707 R702
4.4.5. Mixer Circuit

The next stage is a double balanced mixer. The mixer is made up from two balanced transformers,
L720 and L723, and quad-diode D709.
L720 L723 D706
The RF signal is injected into the primary of L720, and the IF is taken from the centre tap
connection of L720. The 1st LO is injected into the primary of L723. The receive frequency, and
the first local oscillator signal are mixed, and produce four primary frequencies: the sum, the
difference, receive, and first LO (the first LO is equal to the RX frequency minus 46.35 MHz).
Harmonics of the First Local Oscillator (RX_LO) are suppressed by the low pass filter formed by
L8, L23, C81 and C158 before the LO signal is applied to the first mixer via L723.
C81 C158 C32 L8 L23
4.4.6. First IF Filter

The IF signal is next applied to the IF crystal filter, XF3 and associated matching components,
where the 46.35 MHz signal is passed, and all others are rejected.
XF3 R719 C774 C113 C5
4.4.7. First IF Amplifier Circuit

The next stage is the first IF amplifier, which amplifies the first IF of 46.35 MHz before it is applied
to the IF IC (IC1) at pin 16.
Q3 R9 R10 R11 C7
4.4.8. Second LO Tripler Circuit
The 2nd Local Oscillator signal at 45.9MHz is produced in the following way: the reference signal
(VCXO_REF) at 15.3MHz is fed to a Frequency Tripler, Q44. The third harmonic (45.9MHz) is
selected by the resonant circuit formed by L46 and C264 plus the input capacitance of pin 1 of
IC1. This signal is used as the 2nd Local oscillator (IC1 pin 1).
Q44 R210 R251 R253 C260 C277 C257 C264 C259
Page 18 of 80
4.4.9. Second IF Circuit (FM IF IC)

The next stages are contained mostly within the FM IF IC, IC1.
Second IF Mixer
The second IF mixer is where the first IF (46.35 MHz) and second LO (45.9MHz from the RX
Second LO Tripler) are mixed to produce a 450 kHz second IF signal. This circuit is entirely
contained within IC1.
Second IF Filter
The next stage is the second IF filter at 450kHz, where the signal passes from pin 3 of IC1 and is
applied to a ceramic filter, CF3 or CF4, to eliminate adjacent signals outside the second IF pass
band.
Depending on the channel spacing that has been programmed, one of two 450 kHz ceramic IF
filters is selected. In case of 25 kHz spacing the 2nd IF is routed through filter CF3, and if 12.5 kHz
spacing is required then CF4 is selected. Switching is achieved by Q22, D23 & D24 under the
control of the W/N signal from the microprocessor.
IC1 CF3 CF4 D23 D24 Q22 R5 R15 R104 R110 R14 R6
C79 C16
Second IF Amplifier
The filtered 2ND IF is then re-applied to IC1 at pin5 where it is amplified and limited. This circuit is
entirely contained within IC501.
Demodulator circuits
Still inside IC1 the IF signal is fed to a quadrature detector where it is converted to audio. The
major part of the detector is the ceramic resonator CD601. The Q of this device may be changed
to compensate for the differing deviation levels when switching between wide and narrow channel
spacing. This is achieved by Q20, R613 and C8.The recovered audio level is also attenuated
when in Wide mode by R13/Q19. All of this switching is controlled by the W/N signal provided by
the Controller Board.
IC1 Q20 Q19 CD601 R613 R614 R13 R 93 R91 C 617 C6

C131 C171
Recovered Audio leaves IC1 at pin 9 and is routed via R3, C2 and C4 to the Audio stages via
CON2 pin 7 (AF).
IC1 R3 C4 C60
A signal strength output, (RSSI) is provided from IC1 pin 12, and is fed to the Controller Board.
IC1 C611
4.4.10. Noise Squelch Detector
When no RF signal is received, the noise at frequencies above 4 kHz is quite high, however, as
the received signal strength increases this high frequency noise starts to drop rapidly due to the
characteristics of the FM receiver. The level of this high frequency noise is taken as a measure of
the signal strength and used to un-mute (squelch) the audio.
Page 19 of 80
The noise around 16 kHz is band-pass filtered by L14, C125, C111, C167, L30 and amplified in
IC1 (pins 8 & 7) and then by transistor Q2. The noise is full-wave rectified by D14 & D22 and the
proportional DC signal is routed via R90 to the Controller Board (SQL), where the mute (squelch)
decision is taken.
Q19 attenuates the noise signal depending on the wide/narrow selection.
IC1 Q19 Q2 D14 D22 R772 R92 R13 R93 R91 R105 R41 R102 R88 R89 R90
C120 C125 C126 C167 C131 C171 C119 C109 C111 C115 C112 L14 L30
Page 20 of 80
4.5. TRANSMITTER SECTION
The transmit output is formed by taking the output of the TX VCO and amplifying it to the required
level. The TX_VCO has already had the required modulation applied to it in the Synthesiser.
4.5.1. Low Power Transmit Amplifier

The modulated transmit signal is applied to the buffer amplifier based around Q7.
VHF units Q7 R23 R26 R27 R57 C31 C50 C80 L2

UHF units Q7 R26 R27 R35 R57 C31 C50 C80 L2
66-88MHz Q7 R26 R27 R35 C31 C50 C80 L12 C48
4.5.2. Transmit Driver Amplifier

The signal power is further increased in the Driver amplifier stage based around Q8. The gain of
this stage is dependent on the bias, which in turn is set by the current taken in the Final PA stage.
The DC power for this stage is provided directly from the battery supply via the protection fuse.
VHF units Q8 R245 R246 R217 C175 C247 C176 C178 L27 L36
UHF units Q8 R245 R246 R219 R217 C247 C175 C176 C178 C10 L27 L36
66-88MHz Q8 R245 R246 R217 C175 C247 C175 C10 C11 L5 L6 L7 C12 C14
4.5.3. Final Power Amplifier

The transmit signal is further amplified to the desired level by the final power amplifier based
around Q6. The gain of this stage is also dependent on the bias. The transmit signal output from
Q6 passes through a low pass filter to eliminate harmonics and spurious signals. The signal then
passes through the Transmit/Receive Switch circuit and Low Pass filter to the antenna socket.
VHF units Q6 R101 R103 R20 C179 C22 C15 C27 C52 C180 C181 C182 C183
C13 C11 C12 C1 C47 L29 L11 L1 L6
UHF units Q6 R101 R103 R20 C179 C22 C15 C27 C52 C181 C180 C182 C183
C11 C12 C2 L1 L31
66-88MHz Q6 R101 R103 R20 C179 C22 C15 C27 C52 C705 C713 C741 C748
C13 L702 L712 L31
The power for this stage is provided from the Battery via the fuse and the PA current detection
circuit. This current detection circuit measures the current taken by the final stage and uses it to
control the DC bias point for the Driver and Final PA stages.
In order to compensate for variations in gain across the whole band, as well as changing Battery
voltage, comparator (IC9a) monitors the current drawn by the Final PA stage and adjusts the bias
voltage. IC9a sums in the TX_PWR control voltage that sets the final output power.
A sample of the current drawn by Q6 is taken by R34, amplified by IC9B and compared in IC9A
against a voltage, TX_PWR, generated by the Control Board, this being the reference to establish
the desired output power. Any difference is amplified and a correction voltage is applied to the
gates of Q8 and Q6 via R103 & R245. The control of both MOSFETs gives a very wide range, so
Page 21 of 80
even in the event of an open/short antenna the final stage is fully protected and the current drain
from the battery is limited to about 2-3 Amperes.
IC9a IC9b R34R38R59 R94 R98 R137R96 R166 R4 R97

R16 C189 C190 C70 C133 C134 C122 C9
4.5.4. PA Switching Circuit.
Q1 & Q9 form a switch that inhibits the final two stages of the PA in receive mode. This ensures
that no noise or spurious signals are generated in the receive mode. If TXB+ is not present then
Q9 is off, Q1 is consequently conducting and grounds the gates of Q8 and Q6 (no bias). Since
both MOSFETs are “off” any signal that may leak from the RX_LO cannot be amplified and fed to
the antenna or fed back to the RX input. It also prevents any noise being generated by the PA
Transistors which may degrade receive sensitivity.
Q1 Q9 R23
Page 22 of 80
4.6. POWER SUPPLY
4.6.1. Battery connections and Protection circuit

7.2V DC is supplied to the transceiver through the battery terminals CN2. D5 acts as a reverse
power connection protection device. The main feed to the Transmit Driver and Final PA stages is
via BAT+.
CN2 D5 CN1 C18 C142 C177 C199 R50 VOL1
4.6.2. Main Regulator

The main power feed to the rest of the radio comes via the ON/OFF switch built into the Volume
control. The next circuit section is a very low drop-out regulator chip IC5 which produces the main
+5v supply for the radio.
IC5 R216 C141 C172 C215
4.6.3. Transmit and Receive Power control circuit

Q13 and Q14 provide the switched +5V supplies to Transmitter (TXB+) and the Receiver (RXB+)
respectively. The conduction state of these transistors is controlled by TX_EN and RX_EN, from
the Control Board. Q40 and Q42 control the switching of the supplies to the VCO’s and VCO
buffers.
Q13 Q14 Q40 Q42D1 D30 R 158 R159 C 90 C117 C128
4.7. MISCELLANEOUS FUNCTIONS
4.7.1. Switches.
There are five switches on the RF Board, four of them (SW1 to SW4) are a normal SPST type, the
other, CH1, is a BCD encoder, used to send to the selected channel to microprocessor
(ENCODER1 to 4)
As discussed in section 4.1.2, SW1, SW2 and SW4 are connected to the microprocessor as a
matrix. The function of these buttons can be programmed, as required, by the dealer.
SW3 is not programmable; it grounds the PTT line to the microprocessor. The microprocessor
then takes the required action to place the radio into Transmit.
SW1 to SW4 CH1 R54
4.7.2. Indicators.
Built into Button 3, on the top of the radio, is an indicator containing two LEDs. The lightning of two
LEDs is combined to indicate the following states: Transmit, Receive, Scan, Busy, Low Battery&
SelCall. LED diodes D2 and D27 are driven by the signals TX_LED and RX_LED from the
microprocessor. Colours RED, GREEN or YELLOW can be shown by either illuminating the LEDs
individually or together.
D2 D27 R49 R51
Page 23 of 80
4.7.3. Volume Control.
The volume control is done by electronically by the microprocessor. The voltage across the
potentiometer (part of VOL1) is sent, via R52 and VOL, Con2 pin 19, to the microprocessor. The
level of the audio is then regulated electronically by IC9. This way it is possible to setup, by the
programming of the radio, parameters such as the minimum volume, the volume offset between
tones and audio, etc..
VOL1 R 50 R52 R55
4.7.4. Battery Monitoring

The battery for the HX400 series 2 radios contains an IC that monitors the number of charge
cycles that the battery has been exposed to. This information is sent to the microprocessor via
CN2 pin 2, the BAT_COM line, CON2 pin 33 via R3 and R4.
CN2 IC1 R3 R4
Page 24 of 80
5. DISASSEMBLY
Note: Be sure to switch off the transceiver's power before disassembling it.
5.1. Attaching and Removing the Battery Pack
Instructions for attaching and removing the Battery pack are given in the Operators Manual.
5.2. Disassembling the radio
Please, refer to Figure 5.1 Exploded View.
Figure 5.1 Exploded View
1. Remove the two knobs IM6 & IM7, the D-Rings P2 should come out with them, if not, remove
them.
2. Insert wide flat blade screwdriver between the lower part of the Main Frame IM8 and the Front
Case IM1. Lift the Main Frame until there is clearance (side view) between the bottom of the
board and the plastic housing.
3. Gently pull down the ASS’Y C until shafts of the potentiometer and channel switch are out of
the Case. Be careful with this operation because the RF Board is attached to the Control Board
by the flexible circuit FLX1.
4. Remove the tape SM8 on the connector CON2 (36-pin)
5. Gently unlock the connector and release the flexi, now the RF Board is free from the Front
Case.
Page 25 of 80
IF THE RF-PCB NEEDS TO BE REMOVED FOR REPLACING PARTS THEN:
6. Using solder wick, unsolder the centre pin of the Antenna Connector C4
7. Using long nose pliers unscrew nuts C2
8. Remove the 10 Philips screws, S1, holding the PCB to the Main Frame. Gently remove the
board.
IF THE CONTROL-PCB NEEDS TO BE REMOVED FOR REPLACING PARTS THEN:
9. Insert medium flat blade screwdriver between LATCHES on the sides of the Shield Plate P1
and the Front Case.
10. Gently remove the shield under which is the CONTROL-PCB
11. Remove tape SM7 from CON1 (20-pin), also from CON4 (18-pin) in radios with a display
12. Gently unlock the connector and release the flexi, now the CONTROL Board is free from the
Front Case.
13. To remove CONTROL -PCB, lift it from top and pull it upward.
14. In radios with a display, leave it in place.
5.3. Reassembling the radio
The procedure is the reverse of disassembly.
IF THE CONTROL-PCB WAS REMOVED, THEN:
1. Put the CONTROL -PCB in place. To do this, board has to be inserted from top until it sits into
the bottom slits in Front Case IM1
2. Insert flexi FLEX2 into the 20-pin connector CON1 (also the 18-pin flex into CON4 in radios with
display) and lock it. Put a new tape on it.
3. Put the shield plate P1 over the CONTROL -PCB and lock the LATCHES on the sides.
IF THE RF-PCB WAS REMOVED, THEN:
4. Put RF-PCB in place, replace the 10 screws S1, but do not fully tighten.
5. Replace the two nuts C2, and tighten them.
6. Fully tighten the 10 screws S1.
7. Insert FLEX1 into CON2 and lock it. Put a new tape on it.
8. Insert the shafts of the potentiometer and the channel switch into their holes in Front Case;
gently push ASS’Y C all the way in until the assembly goes no further.
9. Using your thumbs, press the Main Chassis into the Front Case until you hear the distinctive
click when the latches in the back plate sit in their slots.
10. Replace back the knobs.
5.4. Visual and Mechanical Inspection.
Check that the O-Ring seal around the RF Board is not displaced.
Check that all the knobs are tight and correctly located.
In the case of radios with keypads, check that all keys operate correctly, and that no key is
depressed, or trapped under the front cover.
Press all other buttons (including the PTT) and check that you can hear the distinctive click of the
micro-switches.
Page 26 of 80
Operate the Volume Control Knob and the Channel Selector Switch and ensure that the fixing nuts
are tight.
Check that the antenna connector is not loose.
Check that the four battery contact springs move smoothly and are not corroded.
IMPORTANT NOTE.
To ensure that the radio is in a working state and ready to return to service after disassembly,
once the radio has been reassembled, is mandatory to check its functionality.
Page 27 of 80
6. TESTING AND PROGRAMMING SETUP.

Following is a suggested arrangement for testing and programming of a HX400 radio.
Figure 6.1 Test & Programming Setup
Page 28 of 80
7. SPECIFICATIONS
General Specifications
Channel Capacity 16 (HX4x2) or 255 (HX4x3/5/6)
Power Supply Lithium-ion 7.4v 1800mAH Battery
Dimensions H x W x D (mm) [Height
100mm(h) x 62.5mm(w) x 39.5mm(d)
excluding knobs]:
Weight : 275g (with battery and antenna)
Environmental Rating IP55 & MIL STD 810C/D/E/F
Operating Temperature -20° to +55°
Frequency Range VHF low 66-88 MHz
VHF: 136-174 MHz
UHF: 400-470 MHz
UHF upper: 450-520 MHz
Channel Spacing 12.5 kHz / 25 kHz
Transmitter
TX Power VHF - 5 Watts (high) / 1 Watt (low)
UHF - 5 Watts (high) / 1 Watt (low)
Modulation 8K0G3E/16K0G3E
Frequency Stability < ±0.00025% (±2PPM)
Maximum Deviation ±2.5 kHz(Narrow)/ ±5 kHz(Wide)
Spurious Emissions -68 [dBc]
Hum & Noise -40[dB]
Receiver
Sensitivity -0.25uV (12dB SINAD)
Spurious Rejection -60dB
Adjacent Channel Selectivity -60 dB (Narrow) , -70 dB (Wide)
Rated Audio 1W
Audio Distortion < 5% (1 kHz 60%)
Figure 7.1 Specifications
Page 29 of 80
8. PARTS LISTS
8.1. Controller and Processor PEC Parts List
Capacitors Capacitors
Ref Entel P/N Description Ref Entel P/N Value Description
C1 30101044600 0.1u Ceramic C161 30101051600 1u Ceramic
C2 30101051600 1u Ceramic C165 30101044600 0.1u Ceramic
C3 31102266310 22u 10V Tantalum C168 20100002100 0 SMD. 0603
C4 30101051600 1u Ceramic C169 00000000000 n/f Not Fitted
C5 00000000000 n/f Not Fitted C173 30101036600 0.01u Ceramic
C6 00000000000 n/f Not Fitted C174 30102216600 220p Ceramic
C7 30101036600 0.01u Ceramic C187 30101036600 0.01u Ceramic
C8 30101044600 0.1u Ceramic C191 20100002100 0 SMD. 0603
C9 30101044600 0.1u Ceramic C192 30102216600 220p Ceramic
C10 30102005600 20p Ceramic C193 30101044600 0.1u Ceramic
C11 30101015600 100p Ceramic C195 31001067200 10u 10V Tantalum
C15 31001067200 10u 10V Tantalum C200 30101015600 100p Ceramic
C18 30104705600 47p Ceramic C203 31004757200 4.7u10V Tantalum
C19 30102216600 220p Ceramic C204 00000000000 n/f Not Fitted
C20 30101044600 0.1u Ceramic C205 20104712100 470 SMD. 0603
C21 30104716600 470p Ceramic C206 20104722100 4.7k SMD. 0603
C22 30101036600 0.01u Ceramic C207 20101042100 100k SMD. 0603
C24 30101044600 0.1u Ceramic C209 20100002100 0 SMD. 0603
C26 30104716600 470p Ceramic C211 31004757200 4.7u10V Tantalum
C33 31102266310 22u 10V Tantalum C212 30101036600 0.01u Ceramic
C34 31201077200 100u 10V Tantalum C213 30101036600 0.01u Ceramic
C35 31201077200 100u 10V Tantalum C214 31004757200 4.7u10V Tantalum
C37 30101051600 1u Ceramic C218 30104705600 47p Ceramic
C38 30101051600 1u Ceramic C219 31001067200 10u 10V Tantalum
C57 30101051600 1u Ceramic C222 30101051600 1u Ceramic
C64 30101044600 0.1u Ceramic C226 31001067200 10u 10V Tantalum
C95 30102005600 20p Ceramic
C96 30102005600 20p Ceramic
C98 30101044600 0.1u Ceramic
C99 30104716600 470p Ceramic
C100 30108205600 82p Ceramic
C101 30101044600 0.1u Ceramic
C102 30104716600 470p Ceramic
C103 30101044600 0.1u Ceramic
C104 30104716600 470p Ceramic
C105 30104716600 470p Ceramic
C106 30101044600 0.1u Ceramic
C107 30101051600 1u Ceramic
C121 30101051600 1u Ceramic
C127 30101044600 0.1u Ceramic
C129 30101044600 0.1u Ceramic
C130 30101051600 1u Ceramic
C135 30104716600 470p Ceramic
Page 30 of 80
Ref Entel P/N Description Ref Entel P/N Value Description
C136 30102005600 20p Ceramic
C137 30102005600 20p Ceramic
C138 31004757200 4.7u 10V Tantalum
C139 30101015600 100p Ceramic
C148 30101044600 0.1u Ceramic
C149 30101036600 0.01u Ceramic
Inductors Miscellaneous
Ref Entel P/N Value Description Ref Entel P/N Value Description
L1 00000000000 N/F Not Fitted XT2 56015360900 15.36MHz Crystal
L2 431451Y4000 FERRITE Inductor XT4 56019200900 19.20MHz Crystal
451
L3 431451Y4000 FERRITE Inductor
451
451
451
451
451
L9 42030170600 10uH Inductor
451
451
451
451
Page 31 of 80
Resistors Resistors
R1 20104732100 47k SMD. 0603 R76 20103332100 33k SMD. 0603
R2 20101012100 100 SMD. 0603 R77 20101042100 100k SMD. 0603
R3 20104732100 47k SMD. 0603 R78 20101032100 10k SMD. 0603
R4 20101012100 100 SMD. 0603 R79 20101032100 10k SMD. 0603
R5 00000000000 n/f Not Fitted R80 20106840100 680k SMD. 0603
R6 20101032100 10k SMD. 0603 R81 20104732100 47k SMD. 0603
R7 20103342100 330k SMD. 0603 R82 00000000000 n/f Not Fitted
R8 20101032100 10k SMD. 0603 R83 20104732100 47k SMD. 0603
R9 20102742100 270k SMD. 0603 R84 20104732100 47k SMD. 0603
R10 20102222100 2.2k SMD. 0603 R85 20101532100 15k SMD. 0603
R11 30102242600 0.22u Ceramic Cap R86 20101042100 100k SMD. 0603
R12 20106812100 680 SMD. 0603 R87 30101051600 1u Ceramic Cap
R13 20101032100 10k SMD. 0603 R106 20104732100 47k SMD. 0603
R14 20101032100 10k SMD. 0603 R107 20101042100 100k SMD. 0603
R15 20101002100 10r SMD. 0603 R108 20101242100 120k SMD. 0603
R16 20104712100 470 SMD. 0603 R109 20101242100 120k SMD. 0603
R17 20102232100 22k SMD. 0603 R113 20101222100 1.2k SMD. 0603
R18 20100002100 0 SMD. 0603 R115 20101002100 10 SMD. 0603
R19 20100002100 0 SMD. 0603 R116 20102222100 2.2k SMD. 0603
R20 30101044600 0.1u Ceramic R119 20101042100 100k SMD. 0603
R21 20104732100 47k SMD. 0603 R120 20101042100 100k SMD. 0603
R22 20104732100 47k SMD. 0603 R122 20104732100 47k SMD. 0603
R23 20101222100 1.2k SMD. 0603 R123 20104732100 47k SMD. 0603
R25 20102232100 22k SMD. 0603 R124 20104732100 47k SMD. 0603
R26 20102222100 2.2k SMD. 0603 R125 20106812100 680 SMD. 0603
R27 00000000000 n/f Not Fitted R126 20106812100 680 SMD. 0603
R28 20101012100 100 SMD. 0603 R130 20104732100 47k SMD. 0603
R29 20101042100 100k SMD. 0603 R131 20101042100 100k SMD. 0603
R30 20101042100 100k SMD. 0603 R132 20101002100 10 SMD. 0603
R31 20101042100 100k SMD. 0603 R133 20104732100 47k SMD. 0603
R32 20102232100 22k SMD. 0603 R135 20104732100 47k SMD. 0603
R33 20101042100 100k SMD. 0603 R136 20101032100 10k SMD. 0603
R34 20101042100 100k SMD. 0603 R138 20102222100 2.2k SMD. 0603
R35 20101022100 1.0k SMD. 0603 R157 20108242100 820k SMD. 0603
R36 20101022100 1.0k SMD. 0603 R170 20101042100 100k SMD. 0603
R37 30104716600 470p Ceramic Cap R171 20101042100 100k SMD. 0603
R38 20104732100 47k SMD. 0603 R172 20100002100 0 SMD. 0603
R39 20100002100 0 SMD. 0603 R173 20101042100 100k SMD. 0603
R40 00000000000 n/f Not Fitted R175 30101044600 0.1u Ceramic Cap
R41 20101022100 1.0k SMD. 0603 R176 20101032100 10k SMD. 0603
R42 00000000000 n/f Not Fitted R178 30104741600 0.47u Ceramic Cap
R43 20106840100 680k SMD. 0603 R179 30101044600 0.1u Ceramic Cap
R45 20102232100 22k SMD. 0603 R181 20101042100 100k SMD. 0603
R49 20101042100 100k SMD. 0603 R183 20102222100 2.2k SMD. 0603
R50 20101012100 100 SMD. 0603 R188 20104732100 47k SMD. 0603
R51 20101012100 100 SMD. 0603 R192 20101042100 100k SMD. 0603
R52 20101032100 10k SMD. 0603 R194 20102232100 22k SMD. 0603
R53 20102222100 2.2k SMD. 0603 R195 20101042100 100k SMD. 0603
R57 20104722100 4.7k SMD. 0603 R197 20104722100 4.7k SMD. 0603
R60 20103312100 330 SMD. 0603 R207 20101042100 100k SMD. 0603
R62 20101042100 100k SMD. 0603 R238 20104732100 47k SMD. 0603
R63 20104732100 47k SMD. 0603 R239 20104732100 47k SMD. 0603
R64 20101052100 1.0M SMD. 0603 R240 20104732100 47k SMD. 0603
R65 20104732100 47k SMD. 0603 R241 20104732100 47k SMD. 0603
R66 20102232100 22k SMD. 0603 R264 20100002100 0 SMD. 0603
R67 20101042100 100k SMD. 0603 R265 20104712100 390 SMD. 0603
R68 20101042100 100k SMD. 0603 R266 20104732100 47k SMD. 0603
R70 20101532100 15k SMD. 0603 R268 20104732100 47k SMD. 0603
R71 20104732100 47k SMD. 0603 R269 20104732100 47k SMD. 0603
Page 32 of 80
Resistors Resistors
R75 20104732100 47k SMD. 0603
Semiconductors Semiconductors
D1 501KDZ56700 KDZ5.6V Zener 5.6V Q1 520C4040400 KRC404 Transistor
NPN
D7 500DS122400 KDS122 Diode Dual Q2 520A3050400 KRA305 Transistor PNP
D15 600C1700200 170TGKT LED single Q3 520C4116400 2SC4116 Transistor
NPN
D16 600C1700200 170TGKT LED single Q5 520C4100400 KRC410 Transistor
NPN
NPN
NPN
D19 600C1700200 170TGKT LED single Q9 520SJ208500 2SJ208 MOSFET P-
Channel
NPN
D28 500DS121400 KDS121 Diode Dual Q11 520C4100400 KRC410 Transistor
NPN
NPN
IC3 535X7041000 CMX7041 Audio Proc Q21 520A3050400 KRA305 Transistor PNP
IC4 5321024T100 25LC1024 EEPROM Q25 520A3050400 KRA305 Transistor PNP
IC5 530F0547000 78F0547 Microproc Q39 520A3050400 KRA305 Transistor PNP
IC6 538M324V200 NJM324 Quad Op-Amp Q41 520C4040400 KRC404 Transistor
NPN
IC9 53162364100 M62364FP 8Ch. A/D Q49 520A3050400 KRA305 Transistor PNP
IC11 53771754000 TK71750S 5V Fixed
Regulator
IC14 53875W01400 TA75W01 DualOpAmp
IC15 537C5233400 MIC5219- 3.6V Fixed
3.6BM5 Regulator
IC102 53771754000 TK71750S 5V Fixed
Regulator
U1 5388547T200 TDA8547 Audio Amp
Page 33 of 80
8.2. RF PEC Parts List - HX42x VHF models
C1A 30101036600 0.01u Ceramic C65 30104716600 470p Ceramic
C5 30101305600 13p Ceramic C69 30102705600 27p Ceramic
C9 31001067200 10u 10V Tantalum C73 31001067200 10u 10V Tantalum
C13 30105605600 56p Ceramic C77 30101044600 0.1uf Ceramic
C14 30101015600 100p Ceramic C79 30101044600 0.1uf Ceramic
C31 30101036600 0.01uf Ceramic C110 30101026600 1000p Ceramic
C33 31102266310 22u 16V Tantalum C112 30101051600 1u Ceramic
C38 00000000000 n/f Not Fitted C117 00000000000 n/f Not Fitted
C47 30104705600 47p Ceramic C132 30101051600 1u Ceramic
C48 41102211000 220nh Inductor C133 30101044600 0.1u Ceramic
Page 34 of 80
C158 30102205600 22p Ceramic
C159 30100206600 2p Ceramic Trimmers
C160 30101044600 0.1u Ceramic TC2 33002005000 20p Trimmer Cap
C162 30100106600 1p Ceramic TC3 33002005000 20p Trimmer Cap
C163 00000000000 n/f Not Fitted
C164 00000000000 n/f Not Fitted
C166 30101044600 0.1u Ceramic
C167 30101044600 0.1u Ceramic
C170 30104716600 470p Ceramic
C171 30102205600 22p Ceramic
C172 30101044600 0.1u Ceramic
C175 30101026600 1000p Ceramic
C176 30101005600 9p Ceramic
C177 31002267200 22u 10V Tantalum
C178 00000000000 n/f Not Fitted
C179 00000000000 n/f Not Fitted
C180 00000000000 n/f Not Fitted
C181 00000000000 n/f Not Fitted
C182 00000000000 n/f Not Fitted
C183 30103305600 33p Ceramic
C184 00000000000 n/f Not Fitted
C185 30101305600 13p Ceramic
C186 30100702600 7p Ceramic
C188 00000000000 n/f Not Fitted
C189 30101044600 0.1u Ceramic
C190 30204758300 4.7u Ceramic
C194 30101044600 0.1u Ceramic
C199 30101044600 0.1u Ceramic
C215 30101044600 0.1u Ceramic
C216 00000000000 n/f Not Fitted
C220 30101044600 0.1u Ceramic
C232 00000000000 n/f Not Fitted
C243 30101026600 1000p Ceramic
C244 30102005600 20p Ceramic
C245 00000000000 n/f Not Fitted
C246 30101036600 0.01u Ceramic
C247 00000000000 n/f Not Fitted
C248 30100602600 6p Ceramic
C249 00000000000 n/f Not Fitted
C250 30102216600 220p Ceramic
C251 30101015600 1.5p Ceramic
C252 30101036600 0.01u Ceramic
C253 30100802600 8p Ceramic
C254 30101005600 9p Ceramic
C255 30100802600 8p Ceramic
C256 30101036600 0.01u Ceramic
C257 30101036600 0.01u Ceramic
C259 30101036600 0.01u Ceramic
C260 30104705600 47p Ceramic
C263 30100106600 1p Ceramic
C264 30101505600 15p Ceramic
C265 31001067200 10u 10V Tantalum
C266 30102205600 24p Ceramic
C272 00000000000 n/f Not Fitted
C277 30103316600 330p Ceramic
C611 30101036600 0.01u Ceramic
Page 35 of 80
C617 30101015600 100p Ceramic
C774 30108205600 82p Ceramic
L1 42028170900 coil.smd Inductor CF3 550C450E90 450kHz_25k Ceramic Filter
0
L2 41102211000 220n Inductor CF4 550C450G90 450kHz_12.5 Ceramic Filter
0 k
L3 41301022000 1u Inductor XF3 551753SB90 46.35MHz Crystal Filter
0
L4 41205612000 560n Inductor VCXO 561535SA90 15.3MHz VCXO
0
L5 41203912000 390n Inductor
L6 42030170600 coil.smd Inductor CN1 62004303000 Fuse 3A SMD Fuse
L7 41101011000 100n Inductor CN2 6910GDBC04 Batt Terminal Contact
00
L7A 42030170800 coil.smd Inductor CON2 63062103600 36PIN CONN Conn.
L8 41103301000 33n Inductor
L9 42030170600 coil.smd Inductor CH1 65284300001 CHANNEL Rotary Encoder
SW
L10 42030170600 coil.smd Inductor SW1 642DA01101 PTT Switch Switch
1
L11 42040130500 coil.smd Inductor SW2 642FA01201 MICRO SWT Switch
1
L12 30102005600 20pF Ceramic Cap SW3 642FA01201 MICRO SWT Switch
1
L13 41205602000 56n Inductor SW4 642FA01201 MICRO SWT Switch
1
L14 41901022000 1m Inductor
L15 41101022020 1u Inductor VOL1 65184340001 Pot. Vol. SW Potentiome-ter/
Switch
L16 41204701000 47u Inductor
L17 20100002100 0 SMD. 0603
L18 41204701000 47u Inductor
L19 41205602000 56n Inductor
L20 41301022000 1u Inductor
L22 41102211000 220n Inductor
L23 20100002100 0 SMD. 0603
L24 41301022000 1uh Inductor
L26 30103905600 39p Ceramic
L27 41106R81000 6.8n Inductor
L28 30101036600 0.01u Ceramic
L29 41101022020 1uh Inductor
L30 41901022000 1mh Inductor
L36 42030170800 coil.smd Inductor
L39 00000000000 n/f Not Fitted
L40 41201010000 100n Inductor
L41 41208201000 82n Inductor
L42 41205612000 560n Inductor
L43 41301022000 1u Inductor
L44 41102211000 220n Inductor
L45 41102211000 220n Inductor
L46 41205612000 560n Inductor
L720 419617PT000 coil Inductor
L727 41201512000 150n Inductor
L728 41205612000 560n Inductor
Resistors Resistors
Page 36 of 80
Resistors Resistors
R1 20101042100 100k SMD. 0603 R89 20104732100 47k SMD. 0603

R2 20101012100 100 SMD. 0603 R90 20101042100 100k SMD. 0603
R3 20102232100 22k SMD. 0603 R91 20104742100 470k SMD. 0603
R4 20101042100 100k SMD. 0603 R92 20102222100 2.2k SMD. 0603
R5 20101032100 10k SMD. 0603 R93 20102222100 2.2k SMD. 0603
R6 20101032100 10k SMD. 0603 R94 20106830100 68k(1%) SMD. 0603
R7 20101012100 100 SMD. 0603 R96 20102722100 2.7k SMD. 0603
R8 20101012100 100 SMD. 0603 R97 20104722100 4.7k SMD. 0603
R9 20102212100 220 SMD. 0603 R98 20106830100 68k(1%) SMD. 0603
R10 20101542100 150k SMD. 0603 R101 20103332100 33k SMD. 0603
R11 20104712100 470 SMD. 0603 R102 20103302100 33r SMD. 0603
R12 20101022100 1k SMD. 0603 R103 20101032100 10k SMD. 0603
R13 20102222100 2.2k SMD. 0603 R104 20104722100 4.7k SMD. 0603
R14 20102232100 22k SMD. 0603 R105 20103302100 33r SMD. 0603
R15 20101022100 1k SMD. 0603 R110 20101022100 1k SMD. 0603
R16 20101022100 1k SMD. 0603 R118 20101032100 10k SMD. 0603
R17 20104722100 4.7k SMD. 0603 R128 20101032100 10k SMD. 0603
R18 20101032100 10k SMD. 0603 R129 20101002100 10r SMD. 0603
R19 20101022100 1k SMD. 0603 R137 20102252100 2.2M SMD. 0603
R20 20102212100 220 SMD. 0603 R139 20105632100 56k SMD. 0603
R21 20102722100 2.7k SMD. 0603 R140 20101042100 100k SMD. 0603
R22 20102212100 220 SMD. 0603 R141 20101042100 100k SMD. 0603
R23 20101212100 120 SMD. 0603 R142 20101042100 100k SMD. 0603
R24 20104722100 3.9k SMD. 0603 R143 20100002100 0 SMD. 0603
R25 20101032100 10k SMD. 0603 R144 20101822100 1.8k SMD. 0603
R26 20101032100 10k SMD. 0603 R145 20101012100 100 SMD. 0603
R27 20102722100 2.7k SMD. 0603 R146 20101012100 100 SMD. 0603
R28 20106812100 680 SMD. 0603 R147 20101032100 10k SMD. 0603
R30 20103912100 390 SMD. 0603 R149 00000000000 n/f Not Fitted
R34 20500R10400 0.1 1/2w SMD. 0603 R153 00000000000 n/f Not Fitted
R37 20102212100 220 SMD. 0603 R155 20104702100 47 SMD. 0603
R38 20102740100 270k (1%) SMD. 0603 R156 20101002100 10 SMD. 0603
R39 20101042100 100k SMD. 0603 R158 20103322100 3.3k SMD. 0603
R41 20102242100 220k SMD. 0603 R160 20101032100 10k SMD. 0603
R42 20101032100 10k SMD. 0603 R161 20102202100 22 SMD. 0603
R43 20101032100 10k SMD. 0603 R162 20103312100 330 SMD. 0603
R44 20102722100 2.7k SMD. 0603 R163 20101802100 18 SMD. 0603
R45 20101032100 10k SMD. 0603 R164 20101032100 10k SMD. 0603
R46 20102212100 220 SMD. 0603 R165 20101032100 10k SMD. 0603
R48 20103332100 33k SMD. 0603 R167 20101012100 100 SMD. 0603
R49 20102212100 220 SMD. 0603 R168 20102722100 2.7k SMD. 0603
R50 20101022100 1k SMD. 0603 R174 20100002100 0 SMD. 0603
R51 20102212100 220 SMD. 0603 R180 20102232100 22k SMD. 0603
R52 20100002100 0 SMD. 0603 R184 20101032100 10k SMD. 0603
R56 20100002100 0 SMD. 0603 R201 20101042100 100k SMD. 0603
R58 20103312100 330 SMD. 0603 R206 20101032100 10k SMD. 0603
R59 20102740100 270k (1%) SMD. 0603 R210 20101022100 1k SMD. 0603
R65 20101042100 100k SMD. 0603 R212 20101002100 10 SMD. 0603
R88 20104722100 4.7k SMD. 0603 R213 20101002100 10 SMD. 0603
R217 20100002100 0 SMD. 0603
Page 37 of 80
Resistors Resistors
R218 20104732100 47k SMD. 0603
R219 41101022020 1u Inductor
R221 20101032100 10k SMD. 0603
R242 20102232100 22k SMD. 0603
R243 20102232100 22k SMD. 0603
R244 20102232100 22k SMD. 0603
R245 20101022100 1k SMD. 0603
R246 20101042100 100k SMD. 0603
R248 20102722100 2.7k SMD. 0603
R249 20106812100 680 SMD. 0603
R251 20106840100 680k SMD. 0603
R253 20104712100 470 SMD. 0603
R262 20101002100 10 SMD. 0603
R613 20101822100 1.8k SMD. 0603
R614 20102222100 2.2k SMD. 0603
R719 20105100100 51 SMD. 0603
R772 20103322100 3.3k SMD. 0603
D1 500DS160700 KDS160 Diode Switch Q1 520C4040400 KRC404 Transistor
NPN
D2 60030101300 KBPA3010 LED Q2 520C4075400 KTC4075 Transistor
dual(R/G) NPN
D3 505SV324700 1SV324 Diode Q3 520C4215400 2SC4215 Transistor
Varicap NPN
D4 505SV324700 1SV324 Diode Q4 521SK508300 2SK508 J-FET P
Varicap
D5 502L4004900 DL4004 Diode Q5 521C4226400 2SC4226 Transistor
NPN
D6 50794019000 UPP9401 Diode PIN Q6 521K3476900 2SK3476 RF Power
FET
D7 501KDZ56700 KDZ5.6V Zener 5.6V Q7 521C4226400 2SC4226 Transistor
NPN
D8 00000000000 N/F Not Fitted Q8 521K3475900 2SK3475 RF Power
FET
D9 507DS114700 Diode Switch Diode Switch Q9 520C4040400 KRC404 Transistor
NPN
D10 505SV324700 1SV324 Diode Q10 521C4226400 2SC4226 Transistor
Varicap NPN
D11 00000000000 N/F Not Fitted Q11 520C4075400 KTC4075 Transistor
NPN
D12 507DS114700 Diode Switch Diode Switch Q13 520A3050400 KRA305 Transistor
PNP
D13 00000000000 N/F Not Fitted Q14 520A3050400 KRA305 Transistor
PNP
NPN
D15 505SV239800 1SV270 Diode Q20 520C4040400 KRC404 Transistor
Varicap NPN
D19 505SV324700 1SV324 Diode Q22 520C4040400 KRC404 Transistor
Varicap NPN
D20 00000000000 N/F Not Fitted Q26 521SK508300 2SK508 J-FET P
D21 50794019000 UPP9401 Diode PIN Q27 520A2014400 KTA2014 Transistor
PNP
D22 500DS122400 KDS122 Diode Dual Q28 520C4075400 KTC4075 Transistor
NPN
D23 500DS121400 KDS121 Diode Dual Q29 520A2014400 KTA2014 Transistor
PNP
D24 500DS121400 KDS121 Diode Dual Q30 00000000000 N/F Not Fitted
D26 505SV262800 VARICAP Diode Q31 00000000000 N/F Not Fitted
D27 60030101300 KBPA3010 LED Q32 00000000000 N/F Not Fitted
Page 38 of 80
dual(R/G)
D29 501HZK2A900 HZK2ALL Zener Q33 00000000000 N/F Not Fitted
D32 00000000000 N/F Not Fitted Q35 521C4226400 2SC4226 Transistor
NPN
D709 50428170900 HSMS-2817 Diode Ring Q36 520A3050400 KRA305 Transistor
PNP
Q37 520C4040400 KRC404 Transistor
NPN
Q38 520C4040400 KRC404 Transistor
NPN
Q40 520A3050400 KRA305 Transistor
PNP
Q42 520C4075400 KTC4075 Transistor
NPN
Q43 521C4226400 2SC4226 Transistor
NPN
Q44 500C4080400 KTC4080 Transistor
NPN
Q52 520A3050400 KRA305 Transistor
PNP
IC1 53631136200 TA31136FN FM-IF

System
IC5 53771754000 TK71750S +5V Fixed
Regulator
IC8 53875W01400 TA75W01FU Dual Op
Amp
IC9 53875W01400 TA75W01FU Dual Op
Amp
IC13 53315E03200 MB15E03SL PLL Freq
Synthesiser
Page 39 of 80
8.3. RF PEC Parts List - HX48x UHF models
C33 31002247500 0.22u 35V Tantalum C112 30101051600 1u Ceramic
C38 00000000000 n/f Not Fitted C117 30104716600 470p Not Fitted
C48 42030100500 30105T Inductor C133 30101044600 0.1u Ceramic
C60 31001067200 10u 10V Tantalum C151 00000000000 n/f Not Fitted
Page 40 of 80
C155 30104716600 470p Ceramic
C156 30104716600 470p Ceramic Trimmers
C157 30100502600 5p Ceramic TC2 33002005000 20p Trimm. Cap
C158 30101805600 18p Ceramic TC3 33002005000 20p Trimm. Cap
C159 30100206600 2p Ceramic
C160 30101036600 0.01u Ceramic
C162 3010R501600 0.5p Ceramic
C163 00000000000 n/f Not Fitted
C164 00000000000 n/f Not Fitted
C166 30101044600 0.1u Ceramic
C167 30101044600 0.1u Ceramic
C170 30104716600 470p Ceramic
C171 30102205600 22p Ceramic
C172 30101044600 0.1u Ceramic
C175 30101026600 1000p Ceramic
C176 30100702600 7p Ceramic
C177 31002267200 22u 10V Tantalum
C178 30102705600 27p Ceramic
C179 00000000000 n/f Not Fitted
C180 30102705600 27p Ceramic
C181 00000000000 n/f Not Fitted
C182 30100802600 8p Ceramic
C183 30100401600 4p Ceramic
C184 30100401600 4p Ceramic
C185 00000000000 n/f Not Fitted
C186 00000000000 n/f Not Fitted
C188 30104705600 47p Ceramic
C189 30101044600 0.1u Ceramic
C190 30204758300 4.7u Ceramic
C194 30104716600 470p Ceramic
C199 30101044600 0.1u Ceramic
C215 30101044600 0.1u Ceramic
C216 00000000000 n/f Not Fitted
C220 30101044600 0.1u Ceramic
C232 00000000000 n/f Not Fitted
C243 30101026600 1000p Ceramic
C244 30101205600 12p Ceramic
C245 00000000000 n/f Not Fitted
C246 00000000000 n/f Not Fitted
C247 30104716600 470p Ceramic
C248 30100502600 5p Ceramic
C249 30102216600 220p Ceramic
C250 30100502600 5p Ceramic
C251 30100106600 1p Ceramic
C252 30101036600 0.01u Ceramic
C253 30100602600 6p Ceramic
C254 00000000000 n/f Not Fitted
C255 30100802600 8p Ceramic
C256 30101036600 0.01u Ceramic
C257 30101036600 0.01u Ceramic
C259 30101036600 0.01u Ceramic
C260 30104705600 47p Ceramic
C263 30100106600 1p Ceramic
C264 30101505600 15p Ceramic
C265 31001067200 10u 10V Tantalum
C274 30100602600 6p Ceramic
C277 30103316600 330p Ceramic
C611 30101036600 0.01u Ceramic
Page 41 of 80
C617 30101015600 100p Ceramic
C774 30108205600 82p Ceramic
L1 41101011000 100n Inductor CF3 550C450E900 450kHz 25k Ceramic Filter
L2 41102201000 22n Inductor CF4 550C450G900 450kHz 12.5k Ceramic Filter
L3 41203912000 390n Inductor XF3 551753SB900 46.35MHz Crystal Filter
L4 41203912000 390n Inductor VCXO 561535SA900 15.3MHz TCXO
L5 41203912000 390n Inductor
L6 42030100500 30105T Inductor CN1 62004303000 FUSE 3A FUSE
SMD
L7 42030120500 30125T Inductor CN2 6910GDBC040 Batt Contact CONTACT
L7A 00000000000 n/f Not Fitted CON2 63062103600 36PIN CONN Connector
L8 41101801000 18n Inductor
L9 42030120500 30125T Inductor CH1 65284300001 CHANNEL Rotary Encoder
SW
L10 42030120500 30125T Inductor SW1 642DA011011 PTT Switch Switch
L11 42030130700 30137T Inductor SW2 642FA012011 MICRO SWT Switch
L12 30100802600 8p Ceramic SW3 642FA012011 MICRO SWT Switch
L13 00000000000 n/f Not Fitted SW4 642FA012011 MICRO SWT Switch
L14 41901022000 1m Inductor
L15 41102211000 220n Inductor VOL1 65184340001 Pot. Vol. /SW Potenti-
ometer/Switch
L16 42030100500 30105T Inductor
L17 20100002100 0 SMD. 0603
L18 42030100500 30105T Inductor
L19 42030100500 30105T Inductor
L20 41203912000 390n Inductor
L22 41102201000 22n Inductor
L23 41101801000 18n SMD. 0603
L24 41203912000 390n Inductor
L26 30103305600 33p Ceramic
L27 42028170900 40093T Inductor
L28 00000000000 n/f Not Fitted
L29 41102211000 220n Inductor
L30 41901022000 1mh Inductor
L31 42030100500 30015T Inductor
L35 41102701000 27n Inductor
L36 42030130700 30137T Inductor
L39 42030120500 30125T Not Fitted
L40 41202201000 22n Inductor
L41 41202401000 24n Inductor
L42 41203912000 390n Inductor
L43 41203912000 390n Inductor
L44 41102701000 27n Inductor
L45 41102201000 22n Inductor
L46 41205612000 560n Inductor
L727 41201512000 150n Inductor
L728 41205612000 560n Inductor
Resistors Resistors
R1 20105632100 56k SMD. 0603 R89 20104732100 47k SMD. 0603
R2 20101012100 100 SMD. 0603 R90 20101042100 100k SMD. 0603
R3 20102232100 22k SMD. 0603 R91 20104742100 470k SMD. 0603
R4 20101042100 100k SMD. 0603 R92 20102222100 2.2k SMD. 0603
R5 20101032100 10k SMD. 0603 R93 20102222100 2.2k SMD. 0603
R6 20101032100 10k SMD. 0603 R94 20106830100 68k 1% SMD. 0603
R7 20101002100 10 SMD. 0603 R96 20102722100 2.7k SMD. 0603
Page 42 of 80
Resistors Resistors
R8 20102212100 220 SMD. 0603 R97 20104722100 4.7k SMD. 0603
R9 20102212100 220 SMD. 0603 R98 20106830100 68k 1% SMD. 0603
R10 20101542100 150k SMD. 0603 R101 20103332100 33k SMD. 0603
R11 20103322100 3.3k SMD. 0603 R102 20103302100 33 SMD. 0603
R12 20102212100 220 SMD. 0603 R103 20101032100 10k SMD. 0603
R13 20102222100 2.2k SMD. 0603 R104 20104722100 4.7k SMD. 0603
R14 20102232100 22k SMD. 0603 R105 20103302100 33 SMD. 0603
R15 20101022100 1k SMD. 0603 R110 20101022100 1k SMD. 0603
R16 20101012100 100 SMD. 0603 R118 20101032100 10k SMD. 0603
R17 20101022100 1k SMD. 0603 R128 20101032100 10k SMD. 0603
R18 20104722100 4.7k SMD. 0603 R129 20101002100 10 SMD. 0603
R19 20101022100 1k SMD. 0603 R137 20102252100 2.2M SMD. 0603
R20 20104712100 470 SMD. 0603 R139 20105632100 56k SMD. 0603
R21 20102722100 2.7k SMD. 0603 R140 20101042100 100k SMD. 0603
R22 20102212100 220 SMD. 0603 R141 20101042100 100k SMD. 0603
R23 20101042100 100k SMD. 0603 R142 20101042100 100k SMD. 0603
R25 20101032100 10k SMD. 0603 R144 20102722100 2.7k SMD. 0603
R26 20101032100 10k SMD. 0603 R145 20101012100 100 SMD. 0603
R27 20104722100 4.7k SMD. 0603 R146 20101012100 100 SMD. 0603
R28 20103922100 3.9k SMD. 0603 R147 20101032100 10k SMD. 0603
R34 20500R10400 0.1 1/2w SMD. 0603 R153 00000000000 n/f Not Fitted
R37 00000000000 n/f Not Fitted R155 20104702100 47 SMD. 0603
R38 20102740100 270k (1%) SMD. 0603 R156 20101002100 10 SMD. 0603
R39 20101042100 100k SMD. 0603 R158 20103322100 3.3k SMD. 0603
R41 20102242100 220k SMD. 0603 R160 20101032100 10k SMD. 0603
R42 20101032100 10k SMD. 0603 R161 20102202100 22 SMD. 0603
R43 20101032100 10k SMD. 0603 R162 20103312100 330 SMD. 0603
R44 20102722100 2.7k SMD. 0603 R163 20101802100 18 SMD. 0603
R45 20101032100 10k SMD. 0603 R164 20101032100 10k SMD. 0603
R46 20102212100 220 SMD. 0603 R165 20101032100 10k SMD. 0603
R48 20103332100 33k SMD. 0603 R167 20101012100 100 SMD. 0603
R49 20102212100 220 SMD. 0603 R168 20101022100 1k SMD. 0603
R50 20101022100 1k SMD. 0603 R174 20100002100 0 SMD. 0603
R51 20102212100 220 SMD. 0603 R180 20102232100 22k SMD. 0603
R52 20100002100 0 SMD. 0603 R184 20101032100 10k SMD. 0603
R56 20100002100 0 SMD. 0603 R201 20101042100 100k SMD. 0603
R58 20103312100 330 SMD. 0603 R206 20101032100 10k SMD. 0603
R59 20102740100 270k (1%) SMD. 0603 R210 20101022100 1k SMD. 0603
R65 20101042100 100k SMD. 0603 R212 20101002100 10 SMD. 0603
R88 20104722100 4.7k SMD. 0603 R213 20101002100 10 SMD. 0603
R217 20100002100 0 SMD. 0603
R218 20104732100 47k SMD. 0603
R219 20101012100 100 SMD. 0603
R221 20101032100 10k SMD. 0603
R242 20102232100 22k SMD. 0603
R243 20102232100 22k SMD. 0603
R244 20102232100 22k SMD. 0603
R245 20101022100 1k SMD. 0603
R246 20101042100 100k SMD. 0603
Page 43 of 80
Resistors Resistors
R248 20104722100 4.7k SMD. 0603
R249 20101012100 100 SMD. 0603
R251 20106840100 680k SMD. 0603
R253 20104712100 470 SMD. 0603
R262 20101002100 10 SMD. 0603
R613 20101222100 1.2k SMD. 0603
R614 20101222100 1.2k SMD. 0603
R719 20105100100 51 SMD. 0603
R772 20103322100 3.3k SMD. 0603
D1 500DS160700 KDS160 Diode Switch Q1 520C4040400 KRC404 Transistor
NPN
D2 60030101300 KBPA3010 LED dual(R/G) Q2 500C4080400 KTC4080 Transistor
NPN
D3 505SV324700 1SV324 Diode Varicap Q3 521BFQ67400 BFQ67W Transistor
NPN
D4 505SV324700 1SV324 Diode Varicap Q4 521SK508300 2SK508 J-FET P
D5 502L4004900 DL4004 Diode Q5 521C4226400 2SC4226 Transistor
NPN
D6 50794019000 UPP9401 Diode PIN Q6 521K3476900 2SK3476 RF-Power
FET
D7 501KDZ56700 KDZ5.6V Zener 5.6V Q7 521C4226400 2SC4226 Transistor
NPN
D8 00000000000 N/F Not Fitted Q8 521K3475900 2SK3475 RF Power
FET
D9 507DS114700 Diode Diode Switch Q9 520C4040400 KRC404 Transistor
Switch NPN
D10 505SV279800 1SV279 Diode Varicap Q10 521C4226400 2SC4226 Transistor
NPN
D11 505SV279800 1SV279 Diode Varicap Q11 520C4075400 KTC4075 Transistor
NPN
D12 507DS114700 KDS114 Diode Switch Q13 520A3050400 KRA305 Transistor
PNP
D13 00000000000 N/F Not Fitted Q14 520A3050400 KRA305 Transistor
PNP
NPN
D15 505DV154700 KDV154 Diode Varicap Q20 520C4040400 KRC404 Transistor
NPN
D19 505SV279800 1SV279 Diode Varicap Q22 520C4040400 KRC404 Transistor
NPN
D20 505SV279800 1SV279 Diode Varicap Q26 521SK508300 2SK508 J-FET P
D21 50794019000 UPP9401 Diode PIN Q27 520A2014400 KTA2014 Transistor
PNP
D22 500DS122400 KDS122 Diode Dual Q28 520C4075400 KTC4075 Transistor
NPN
D23 500DS121400 KDS121 Diode Dual Q29 520A2014400 KTA2014 Transistor
PNP
D24 500DS121400 KDS121 Diode Dual Q30 0000000000\ N/F Not Fitted
D26 505SV324700 1SV324 Diode Varicap Q31 00000000000 N/F Not Fitted
D27 60030101300 KBPA3010 LED dual(R/G) Q32 00000000000 N/F Not Fitted
D29 501HZK2A900 HZK2ALL Zener Q33 00000000000 N/F Not Fitted
D32 505SV239800 1SV270 Not Fitted Q35 521BFQ67400 BFQ67W Transistor
NPN
D709 50428170900 HSMS-2817 Diode Ring Q36 520A3050400 KRA305 Transistor
PNP
Q37 520C4040400 KRC404 Transistor NPN
Q38 520C4040400 KRC404 Transistor NPN
Page 44 of 80
Q40 520A3050400 KRA305 Transistor PNP
Q42 520C4075400 KTC4075 Transistor NPN
Q43 521C4226400 2SC4226 Transistor NPN
Q52 520A3050400 KRA305 Transistor PNP
IC1 53631136200 TA31136FN FM IF System

IC5 53771754000 TK71750S +5V Fixed
Regulator
IC8 53875W01400 TA75W01F Op Amp Dual
U
U
IC13 53315E03200 MB15E03SL PLL.Frequency
Synthesiser
8.4. RF PEC Parts List - HX41x 66-88MHz models
C6 30101036600 0.01u Ceramic C55 00000000000 n/f Not Fitted
Page 45 of 80
C45 30105605600 56p Ceramic C117 30104716600 470p Not Fitted
C134 30101044600 0.1u Ceramic
C155 00000000000 n/f Not Fitted
C160 30101044600 0.1u Ceramic
C611 30101036600 0.01u Ceramic
C167 30101044600 0.1u Ceramic

C707 30101516600 150p Ceramic
C184 30105605600 56p Ceramic
C712 30104716600 470p Ceramic
C194 30104716600 470p Ceramic
C732 30104716600 470p Ceramic
C733 30101016600 100p Ceramic
Page 46 of 80
C247 30102236600 0.022u Ceramic
C760 30102236600 0.022u Ceramic

C761 30101044600 0.1u Ceramic
C762 30101044600 0.1u Ceramic
C767 30104716600 470p Ceramic
C768 30101505600 15p Ceramic
C770 30104705600 47p Ceramic
C774 30108205600 82p Ceramic
C777 30103905600 39p Ceramic
C779 30101005600 10p Ceramic
C780 30101005600 10p Ceramic
C781 30103905600 39p Ceramic
C784 30101036600 0.01u Ceramic
L1 42028170900 40093T Inductor CF3 550C450E900 450kHz Ceramic Filter
25k
L2 41102711000 270n Inductor CF4 550C450G900 450kHz Ceramic Filter
12.5k
L3 431451Y4000 451Y Ferrite XF3 551753SB900 46.35MHz Crystal Filter
L4 20102212100 220R SMD. 0603 VCXO 561535SA900 15.3MHz TCXO
L5 42030130700 30137T Inductor
L6 42030100700 30105T Inductor CN1 62004303000 FUSE 3A FUSE
SMD
L7 42030130700 30137T Inductor CN2 6910GDBC040 Batt CONTACT
Contact
L8 41106801000 68n Inductor CON2 63062103600 36PIN Connector
CONN
L11 42028170900 40093T Inductor
L12 30101505600 15p Ceramic CH1 65284300001 CHANNEL Rotary Encoder
SW
L14 41901022000 1mh Inductor SW1 642DA011011 PTT Switch
Switch
L22 41102711000 270n Inductor SW2 642FA012011 MICRO Switch
SWT
L23 20100002100 0 SMD. 0603 SW3 642FA012011 MICRO Switch
SWT
L29 20104712100 470R SMD. 0603 SW4 642FA012011 MICRO Switch
SWT
L30 41901022000 1mh Inductor VOL1 65184340001 Pot.Vol. Pot-/Switch
L31 42030130700 30137T Inductor
L33 431451Y4000 451Y Ferrite
Page 47 of 80
L34 431451Y4000 451Y Ferrite
L36 42028170900 coil Inductor
L44 41102211000 220n Inductor
L45 41102711000 270n Inductor
L46 41205612000 560n Inductor
L46 41205612000 560n Inductor
L502 20100002100 0 SMD. 0603
L503 20102212100 220R SMD. 0603
L507 41203301000 33n Inductor
L508 41301022000 1u Inductor
L509 41301022000 1u Inductor
L511 41208201000 82n Inductor
L512 41302222000 2u2 Inductor
L702 42030100700 30105T Inductor
L704 41204701000 47n Inductor
L705 41204701000 47n Inductor
L706 41204701000 47n Inductor
L707 41204701000 47n Inductor
L711 41301022000 1u Inductor
L713 41204712000 470n Inductor
L725 41203901000 39n Inductor
L727 41201512000 150n Inductor
L728 41205612000 560n Inductor
Resistors Resistors
R1 20104732100 47k SMD. 0603 R123 20104732100 47K SMD. 0603
R2 20101012100 100 SMD. 0603 R124 20104732100 47K SMD. 0603
R3 20102232100 22k SMD. 0603 R128 20101032100 10k SMD. 0603
R4 20101042100 100k SMD. 0603 R129 20101002100 10 SMD. 0603
R5 20101032100 10k SMD. 0603 R133 20104732100 47K SMD. 0603
R6 20101032100 10k SMD. 0603 R135 20104732100 47K SMD. 0603
R7 20101002100 10 SMD. 0603 R136 20101032100 10k SMD. 0603
R8 20102212100 220 SMD. 0603 R137 20102022100 2k SMD. 0603
R9 20102212100 220 SMD. 0603 R144 20101822100 1.8k SMD. 0603
R10 20101542100 150k SMD. 0603 R145 20101012100 100 SMD. 0603
R11 20103322100 3.3k SMD. 0603 R146 20101012100 100 SMD. 0603
R12 20102212100 220 SMD. 0603 R147 20101032100 10k SMD. 0603
R13 20102222100 2.2k SMD. 0603 R148 20102732100 27k SMD. 0603
R14 20101032100 10k SMD. 0603 R149 20106822100 6.8k SMD. 0603
R15 20101022100 1k SMD. 0603 R150 20102732100 27k SMD. 0603
R16 20101012100 100 SMD. 0603 R151 20102722100 2.7k SMD. 0603
R17 20101022100 1k SMD. 0603 R152 20104722100 4.7k SMD. 0603
R18 20104722100 4.7k SMD. 0603 R153 20106822100 6.8k SMD. 0603
R19 20101022100 1k SMD. 0603 R154 20102222100 2.2k SMD. 0603
R20 20104712100 470 SMD. 0603 R155 20104702100 47 SMD. 0603
R21 20101032100 10k SMD. 0603 R156 20101012100 100 SMD. 0603
R22 20104732100 47K SMD. 0603 R157 20108242100 820k SMD. 0603
R23 20101042100 100k SMD. 0603 R158 20103322100 3.3k SMD. 0603
R24 20101022100 1k SMD. 0603 R160 20101032100 10k SMD. 0603
R25 20101032100 10k SMD. 0603 R162 20103312100 330 SMD. 0603
R26 20102222100 2k2 SMD. 0603 R163 20101042100 100k SMD. 0603
R27 20104722100 4.7k SMD. 0603 R164 20101802100 18 SMD. 0603
R28 20108212100 820 SMD. 0603 R165 20101032100 10k SMD. 0603
R29 20100002100 0r SMD. 0603 R166 20101032100 10k SMD. 0603
R30 20101022100 1k SMD. 0603 R167 20101012100 100 SMD. 0603
Page 48 of 80
Resistors Resistors
R31 20101022100 1k SMD. 0603 R168 20105622100 5.6k SMD. 0603
R32 20102232100 22k SMD. 0603 R170 20101042100 100k SMD. 0603
R33 20101042100 100k SMD. 0603 R171 20101042100 100k SMD. 0603
R34 20500R10400 0.1 1/2w SMD. 0603 R172 20100002100 0 SMD. 0603
R35 20101512100 150 SMD. 0603 R173 20101042100 100k SMD. 0603
R37 20101012100 100 SMD. 0603 R175 30101044600 0.1u Ceramic
R38 20102740100 270k (1%) SMD. 0603 R176 20101032100 10k SMD. 0603
R39 20101042100 100k SMD. 0603 R178 30101044600 0.1u Ceramic
R40 20101042100 100k SMD. 0603 R179 30102242600 0.22u Ceramic
R41 20102242100 220k SMD. 0603 R180 20102232100 22k SMD. 0603
R42 20101032100 10k SMD. 0603 R181 20101042100 100k SMD. 0603
R43 20101032100 10k SMD. 0603 R183 20102222100 2.2k SMD. 0603
R44 20102722100 2.7k SMD. 0603 R184 20101032100 10k SMD. 0603
R45 20101532100 15k SMD. 0603 R188 20104732100 47k SMD. 0603
R46 20102212100 220 SMD. 0603 R192 20101042100 100k SMD. 0603
R47 20102212100 220 SMD. 0603 R194 20102232100 22k SMD. 0603
R48 20102242100 220k SMD. 0603 R195 20101042100 100k SMD. 0603
R49 20102212100 220 SMD. 0603 R197 20104732100 47k SMD. 0603
R50 20101022100 1k SMD. 0603 R205 20102232100 22k SMD. 0603
R51 20102212100 220 SMD. 0603 R206 20101032100 10k SMD. 0603
R52 20100002100 0 SMD. 0603 R207 20101042100 100k SMD. 0603
R53 20101042100 100k SMD. 0603 R210 20101022100 1k SMD. 0603
R54 20101032100 10k SMD. 0603 R212 20101002100 10 SMD. 0603
R55 20101022100 1k SMD. 0603 R213 20101002100 10 SMD. 0603
R56 20100002100 0 SMD. 0603 R217 20100002100 0 SMD. 0603
R57 20104722100 4.7k SMD. 0603 R218 20104732100 47k SMD. 0603
R58 20103312100 330 SMD. 0603 R219 20101012100 100 SMD. 0603
R59 20102740100 270k (1%) SMD. 0603 R221 20101032100 10k SMD. 0603
R60 20103312100 330 SMD. 0603 R240 20104732100 47k SMD. 0603
R62 20101042100 100k SMD. 0603 R241 20104732100 47k SMD. 0603
R63 20104732100 47k SMD. 0603 R242 20102232100 22k SMD. 0603
R64 20101052100 1M SMD. 0603 R243 20102232100 22k SMD. 0603
R65 20101042100 100k SMD. 0603 R244 20102232100 22k SMD. 0603
R66 20102232100 22k SMD. 0603 R245 20101032100 10k SMD. 0603
R67 20101042100 100k SMD. 0603 R246 20103332100 33k SMD. 0603
R68 20101042100 100k SMD. 0603 R248 20104722100 4.7k SMD. 0603
R69 20101532100 15k SMD. 0603 R249 20106812100 680 SMD. 0603
R70 20101532100 15k SMD. 0603 R251 20106842100 680k SMD. 0603
R71 20104732100 47k SMD. 0603 R253 20104712100 470 SMD. 0603
R75 20104732100 47k SMD. 0603 R262 20101002100 10 SMD. 0603
R76 20103332100 33k SMD. 0603 R266 20104732100 47k SMD. 0603
R77 20101532100 15k SMD. 0603 R268 20104732100 47k SMD. 0603
R78 20101032100 10k SMD. 0603 R269 20104732100 47k SMD. 0603
R79 20101032100 10k SMD. 0603 R270 20104732100 47k SMD. 0603
R80 20106842100 680k SMD. 0603 R502 20100002100 0 SMD. 0603
R81 20104732100 47k SMD. 0603 R505 20100002100 0 SMD. 0603
R83 20104732100 47k SMD. 0603 R522 20101032100 10k SMD. 0603
R84 20104732100 47k SMD. 0603 R523 20100002100 0 SMD. 0603
R85 20101532100 15k SMD. 0603 R524 20101032100 10k SMD. 0603
R86 20101042100 100k SMD. 0603 R532 20100002100 0 SMD. 0603
R87 30101051600 1u Ceramic R533 20100002100 0 SMD. 0603
R88 20104722100 4.7k SMD. 0603 R534 20101032100 10k SMD. 0603
R89 20104732100 47k SMD. 0603 R535 20103922100 3.9k SMD. 0603
R90 20101042100 100k SMD. 0603 R536 20101032100 10k SMD. 0603
R91 20104742100 470k SMD. 0603 R613 20101822100 1.8k SMD. 0603
R92 20102222100 2.2k SMD. 0603 R614 20102222100 2.2k SMD. 0603
R93 20102222100 2.2k SMD. 0603 R702 20101042100 100k SMD. 0603
R94 20106830100 68k SMD. 0603 R703 20101042100 100k SMD. 0603
R96 20102722100 2.7k SMD. 0603 R705 20102212100 220 SMD. 0603
R101 20103332100 33k SMD. 0603 R707 20105622100 5.6k SMD. 0603
Page 49 of 80
R102 20103302100 33 SMD. 0603 R708 20101032100 10k SMD. 0603

R103 20101032100 10k SMD. 0603 R709 20104732100 47k SMD. 0603
R104 20104722100 4.7k SMD. 0603 R710 20100002100 0 SMD. 0603
R105 20103302100 33 SMD. 0603 R717 20101022100 1k SMD. 0603
R106 20104732100 47k SMD. 0603 R718 20101002100 10 SMD. 0603
R107 20101042100 100k SMD. 0603 R719 20105102100 51 SMD. 0603
R108 20101242100 120k SMD. 0603 R772 20103322100 3.3k SMD. 0603
R109 20101242100 120k SMD. 0603
R110 20101022100 1k SMD. 0603
R113 20101222100 1.2k SMD. 0603
R115 20101002100 10 SMD. 0603
R116 20102222100 2.2k SMD. 0603
R118 20101032100 10k SMD. 0603
R119 20101042100 100k SMD. 0603
R120 20101042100 100k SMD. 0603
R122 20104732100 47K SMD. 0603
D1 500DS160700 KDS160 Diode Switch Q1 520C4040400 KRC404 Transistor NPN
D2 60030101300 KBPA3010 LED dual(R/G) Q2 500C4080400 KTC4080 Transistor NPN
D3 501KDZ56700 KDZ5.6V Zener 5.6V Q3 521BFQ67400 BFQ67W Transistor NPN
D4 00000000000 N/F Not Fitted Q4 521C4226400 2SC4226 Transist. NPN
D5 502L4004900 DL4004 Diode Q5 521BFQ67400 BFQ67W Transistor NPN
D6 50794019000 UPP9401 Diode PIN Q6 521K3476900 2SK3476 RF-Power FET
D7 500DS122400 KDS122 Diode Dual Q7 521C4226400 2SC4226 Transistor NPN
D8 500DS122400 KDS122 Diode Dual Q8 521K3475900 2SK3475 RF Power FET
D9 507DS114700 Diode Diode Switch Q9 520C4040400 KRC404 Transistor NPN
Switch
D10 00000000000 N/F Not Fitted Q10 521C4226400 2SC4226 Transistor NPN
D11 00000000000 N/F Not Fitted Q11 520C4075400 KTC4075 Transistor NPN
D12 507DS114700 KDS114 Diode Switch Q13 520A3050400 KRA305 Transistor PNP
D14 500DS122400 KDS122 Diode Dual Q19 520C4040400 KRC404 Transistor NPN
D15 00000000000 N/F Not Fitted Q20 520C4040400 KRC404 Transistor NPN
D23 500DS121400 KDS121 Diode Dual Q22 520C4040400 KRC404 Transistor NPN
D27 60030101300 KBPA3010 LED dual(R/G) Q27 520A2014400 KTA2014 Transistor PNP
D28 500DS121400 KDS121 Diode Dual Q28 520C4075400 KTC4075 Transistor NPN
D29 501HZK2A900 HZK2ALL Zener Q29 520A2014400 KTA2014 Transistor PNP
D30 500DS120400 KDS120 Diode Dual Q30 520C4075400 KTC4075 Transistor NPN
D32 00000000000 N/F Not Fitted Q31 520C4075400 KTC4075 Transistor NPN
D501 505SV228300 1SV228 Diode Varicap Q32 520C4075400 KTC4075 Transistor NPN
D701 507VC131800 HVC131 PIN Diode Q37 520C4040400 KRC404 Transistor NPN
D703 505SV228300 1SV228 Diode Varicap Q38 520C4040400 KRC404 Transistor NPN
D704 505SV228300 1SV228 Diode Varicap Q39 520A3050400 KRA305 Transistor PNP
D709 50428170900 HSMS-2817 Diode Ring Q40 520A3050400 KRA305 Transistor PNP
D710 507VC131800 HVC131 PIN Diode Q41 520C4040400 KRC404 Transistor NPN
Q42 520C4075400 KTC4075 Transistor NPN
Page 50 of 80
IC1 53631136200 TA31136FN FM IF System Q52 520A3050400 KRA305 Transistor PNP
IC5 53771754000 TK71750S +5V Fixed Q501 521C4226400 2SC4226 Transistor NPN
Regulator
IC8 53875W01400 TA75W01F Op Amp Dual Q502 521C4226400 2SC4226 Transistor NPN
U
U
IC13 53315E03200 MB15E03SL PLL.Frequency
Synthesiser
Page 51 of 80
8.5. Mechanical Parts List – HX4x2 Models
Page 52 of 80
Page 53 of 80
Page 54 of 80
Page 55 of 80
9. CIRCUIT DIAGRAMS
The following circuit diagrams for the HX400 Series 2 radios are included below:
Figure 9.2 Controller and Processor PEC Circuit Diagram Sheet 1 – All Models
Figure 9.4 RF PEC Block Diagram – All Models
Figure 9.5 Synthesiser Circuit Diagram – VHF Models
Figure 9.6 VCO Circuit Diagram – VHF Models
Figure 9.7 Receiver Circuit Diagram – VHF Models
Figure 9.8 Transmitter Circuit Diagram – VHF Models
Figure 9.9 Synthesiser Circuit Diagram – UHF Models
Figure 9.10 VCO Circuit Diagram – UHF Models
Figure 9.11 Receiver Circuit Diagram – UHF Models
Figure 9.12 Transmitter Circuit Diagram – UHF Models
Figure 9.9 Synthesiser Circuit Diagram – 66-88MHz Models
Figure 9.10 VCO Circuit Diagram – 66-88MHz Models
Figure 9.11 Receiver Circuit Diagram – 66-88MHz Models
Figure 9.12 Transmitter Circuit Diagram – 66-88MHz Models
Figure 9.17 HX42x RF Board, TOP VIEW
Figure 9.18 HX42x RF Board, BOTTOM VIEW
Figure 9.23 HX4Xx Control Board, TOP VIEW
Figure 9.24 HX4Xx Control Board, BOTTOM VIEW
HX42x are VHF models.

HX48x are UHF models.
HX41x are 66-88MHz models.
Page 56 of 80
A B C D E F G H
BUT_IN_4
1
BUT_IN_3 R?
C? FLDMO R? SWB+
2 CON2
J?
BUT_IN_2 R22 R3 PLL_EN
C?
C?
C95 3
BUT_IN_1 R64 PLL_LD
Q?
Q?
C96 C10 Q2 4
BUT_IN_0 R64 R? +5V BACK_LIGHT W/N
SW1 SW6 SW11 SW16 R62
R?
Q3 Q? 5
R?
Q16 IC_CLK
S? S? S? S? 6
1 IC_DATA
7
BEAT_SHIFT AF
D15
D17
D20
R270
R?
1 2 8
BUT_OUT_0 TX_LED
7041_IRQN
XT2
CMX_OFF
7041_CSN
BUT_IN_4
BUT_IN_3
BUT_IN_2
BUT_IN_1
BUT_IN_0
D?
D?
D?
9
BUT_OUT_1 RX_LED
PLL_EN
SW2 SW7 SW12 SW17
RESET
10
BUT_OUT_2 BAT+
D19
D18
D16
CS1
S? S? S? S? +5V 11
BUT_OUT_3 SW_BAT
D?
D?
D?
12
BUT_OUT_4 SWB+
C45 13
R125
R126
RX_EN
R12
R?
R?
R?
C? 14
SW3 SW8 SW13 SW18
R? +5V C? RX_FIL
+5V 15
R63 RSSI
S? S? S? S? C9 16
VCO_CON
R135
R?
17
R?
C? SQL
R240 18
20
19
18
17
16
15
14
13
12
11
10
R81 R136 TX_EN
9
8
7
6
5
4
3
2
1
R?
C66 19
SW4 SW9 SW14 SW19 SW_BAT R? VOL
20
FLMDO
VDD
VDD
IRQN
EVSS
VSS
REGC
PLL_LE
7041CSN
EEP1CSN
EEP0CSN
XTAL1
XTAL2
RESET
FLMDO_CTRL
BUT_IN_4
BUT_IN_3
BUT_IN_2
BUT_IN_1
BUT_IN_0
R? KEY_IN TX_PWR
2 S? S? S? S? 21
R83 BUT_IN_0
22
FREQ_CON
21 80 23
R? TX_LED TX_LED ANG_SEN SENSOR BUT_OUT_1
22 79 24
SW5 SW10 SW15 SW25 R106 RX_LED RX_LED VOX_EN VOX_EN PTT
23 78 25
W/N W/N BUSY BUSY BUT_OUT_3
S? S? S? S? 24 77 26
R? PLL_LD PLL_LD EXT_MUTE MUTE BUT_OUT_0
25 76 27
R133 ENCODER0 ENCO_0 INT_MUTE AUD_MUTE ENCODER0
26 75 28
DA_LE DA_LE POWER_BUTTON ENCODER1
R?
R132 27 74 29
VCC RS TX_EN TX_EN ENCODER2
28 IC? 73 30
PW_WR RX_EN RX_EN ENCODER3
BAT+ SWB+
29
E_RD uPD78F ICDATA
72
IC_DATA
31
30 71 32
CON4J? DB7 7041RDATA 7041_RDATA
SWB+
31
DB6
IC5 IC_CLK
70
IC_CLK BAT_COM
33
1 32 69 34
VCC DB5 MIC_EN MIC_EN MOD_OUT2
R1
R?
3 Q? 2 33 68 35
Q9 GND DB4 BAT MOD_OUT1
3 34 67 36
D7 DB3 VOX VOX
4 35 66 37
Q?
C197 D6 DB2 SQL SQL

5 36 65 38
D5 DB1 RSSI RSSI
C?
C193 6 37 64
C? Q41 D4 DB0 TEMP VOL
D?
7 38 63 D1
RESET D3 POWER_EN EXT_DET EXT_DET
8 39 62 1
D2 EXT_PTT EXT_OBJ2 EXT_OBJ2
BUT_OUT_4
BUT_OUT_3
BUT_OUT_2
BUT_OUT_1
BUT_OUT_0
IC11
R?
R?
R124 R84 9 40 61 2 CON1
VOICE_OP
J?
VOICE_CS
IC?
D1 ENCO_2 EXT_OBJ1 EXT_OBJ1 EXT_DET
BCKLGTH
BAT_RDX
BAT_TDX
1 5 10 3
VCO_EN
ENCO_3
ENCO_4
IN OUT +5V D0 EXT_SPK+
AVREF
BEEP1
BEEP0
11 4
AVSS
RD EXT_SPK-
RDX
TDX
PTT
3 4 12 5
EN BYP WR +5V EXT_OBJ1 R?
13 R39 6
+
R71
R38
R65
RS EXT_MIC
D?
C?
R?
R?
R?
14 7
C?
C?
2
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
RESET R? FLAT_AUDIO_OUT
D28 C198 C195 C196 15 8
CS1 R131 FLAT_AUDIO_IN
16 9
4 CS2 R? EXT_PTT1
ENCODER1
17 10
POWER_EN
EXT_PTT
R122
R123
LED+ R? R130 INT_MIC

R?
R?
18 R265 11
LED- C165 INT_SPK+
R?
19 R264 12
C?
GND VCC INT_SPK-
20
ENCODER2
13
ENCONDER3
VCO_CON
BUT_OUT_4
BUT_OUT_3
BUT_OUT_2
BUT_OUT_1
BUT_OUT_0
BACK_LIGHT
CS3
VOICE_OP
RXD
TXD
PTT
KEY_IN GND
14
POWER_EN EXT_OBJ2
15
+5V
16
Q? SWB+ BEAT_SHIFT RXD
17
IC4_25LC1024 Q49 TXD
R?
+5V R4 18
R2 RESET
R?
R51 R50
R?
1 U? 8 19
CS1 CS VCC R? BAT_COM DA_LE
20
R210 C6 FLDMO
2 7 Q? C? 21
7041_RDATA SO HOLD R?
Q1 BACK_LIGTH R? R? VOL2
22
R10 R41
3 6
WP SCLK IC_CLK C7
5 C?
AUDIO_IN
4 5 R11
C?
GND SI IC_DATA
C22 ENTEL HX400 Radios Series 2.0
C?
MOD_AUDIO Title: Contoller & Audio Processor Board
R?
R207 Project: HX400_2.0 File: CNTRL01.chm Page: 1/3

Number: 400.02.CN01 Date: Sep. 29, 2008 Rev. : 2.0
Page 57 of 80
A B C D E F G H
1
2 CON2
J?
CMX_OFF PLL_EN
3
PLL_LD
4
W/N
5
1 C219 C221 C211 IC_CLK
6
C? R170 C200 IC_DATA
7
FLAT_AUDIO_2 R?
R23 AF
C1
+
L1
8
C2
T1
R1 TX_LED
+
R?
R171 9
C?
L4 R113 +3,6V RX_LED
Q10 10
R2 BAT+
11
SW_BAT
12
12
11
10
SWB+
9
8
7
6
5
4
3
2
1
13
C57 RX_EN
R181
R?
14
EPSO
GPI0B
GPI0A
VDEC
IRQN
EPSCSN
EPSCLK
C?
GPI01
DVSS1
BOOTEN2
BOOTEN1
EPSI
RX_FIL
C? 15
MIC_PROC R? IC1 RSSI
R173 C210 16
7041_IRQN VCO_CON
13 48 17
MODULE SYSCLK1 CSN 7041_CSN SQL
14 47 +3.6V 18
DVSS2 SYSCLK2 IC_CLK TX_EN
1 15 46 19
AUDIO_IN AUDIO_IN GPIO2 SERIALCLK VOL
2 2 16 45 20
BUSY BUSY DISC DVSS4 L2
L33 TX_PWR
3 17 IC3___CMX7041 44 21
VOICE_OP VOICE_OP DISCFB N/C L5 BUT_IN_0
4 18 43 22
L3
+3.6V +3.6V ALT REPLYDATA 7041_RDATA FREQ_CON
L?
5 19 42 23
CS3 CS3 ALTFB COMMANDDATA IC_DATA BUT_OUT_1
6 L3 20 41 24
IC_CLK IC_CLK MICFB DVDD PTT
7 21 40 25
+
IC_DATA IC_DATA MIC XTALN BUT_OUT_3
C7
2
8 22 39 C136 26
C8
SENSOR SENSOR AVSS1 XTAL/CLK BUT_OUT_0
9 23 38 XT4 C214 C213 27
C6
GND MOD1 MOD1 DVEC ENCODER0
10 24 37 28
AUDIOOUT
1
C5
GND MOD2 MOD2 DVSS3 ENCODER1
AUXADC1
AUXADC2
AUXADC3
AUXADC4
AUXDAC1
AUXDAC2
AUXDAC3
AUXDAC4
11 29
GND ENCODER2
AVSS2
VBIAS
12 C137 30
AVDD
GND R176 ENCODER3
31
AUDIO_IN R?
32
C208 33
+
C?
Q?
25
26
27
28
29
30
31
32
33
34
35
36
BAT_COM
C3
L6 Q8 34
L4
C4
3 MOD_OUT2
C138 C173 CMX_OFF 35
MOD_OUT1
36
37
L?
38
L7 L31
+
+3.6V SWB+
C?
D?
L?
C?
C?
D1
C201 C203 C202 IC? 1
SWB+
5 1 2 CON1
J?
OUT IN EXT_DET
R188
R?
3
IC15 EXT_SPK+
+5V 4 3 4
C20 BYP EN EXT_SPK-
5
+
EXT_OBJ1 R?
C?
R39 6
C?
C?
2
C? T?
C228 Q7 EXT_MIC
C226 C227 C229 7
C?
R28 IC9 FLAT_AUDIO_OUT
R?
8
R29 FLAT_AUDIO_IN
4 C? 1 5 9
VIN1 VDD R? TX_PWR EXT_PTT1
4 2 10
VIN2 VOUT1 R? RX_FIL MOD_OUT2 INT_MIC
C25 9 3 R30 R31 11
VIN3 VOUT2 (TONES) INT_SPK+
12 10 12
VIN4 VOUT3 R? FREQ_CON R32 R33 INT_SPK-
13 11 13
MOD_TONE VIN5 VOUT4 R? R? MOD_OUT1
16 14 14
VIN6 VOUT5 R35 (VOICE) EXT_OBJ2
21 15 15
MOD_AUDIO VIN7 VOUT6 R?
C23 +5V
24 22 16
C?
VOL1 VIN8 VOUT7 RXD

6 23 17
DA_LE LD VOUT8 VOL2 TXD
7 19 18
IC_CLK CLK RESET RESET
8 18 C? 19
IC_DATA DI IC?
VDAREF R? DA_LE
20 17 20
GND DO TONE_AUDIO R26 FLDMO
C16 21
R?
R27 22
R18
R? R?
C24
R?
5 R34
C?
R40
R269
R? R? R? +5V ENTEL HX400 Radios Series 2.0
R16 R17 Title: Contoller & Audio Processor Board
Project: HX400_2.0 File: CNTRL02.chm Page: 2/3
Page 58 of 80
A B C D E F G H
C168
R194 C217 SW_BAT
+5V C? C? C? 1
AF R? FLAT_AUDIO_OUT
L9 2 CON2
J1
R21 PLL_EN
R192 C107 3
R?
L?
R? PLL_LD
4
1 R120 R45 W/N
2 5
+
- Q?
R? MUTE IC_CLK
C?
C?
C36 C35 C15 Q5
R?
R?
9 1 R19 6
C?
- R195 IC6A FLAT_AUDIO_2 IC_DATA
8 3 C37 7
C?
C?
IC6C R? + AF
C129 10 U?A
8
+ C? TX_LED
U?C C218 9
C?
C149 RX_LED
R?
R119 R20 10
C?
C?
C35 BAT+
C148 11
C18 C? SW_BAT
12
C?
U1_TDA8547 EXT_SPK- SWB+
+ 13
RX_EN
R68 20 1 14
R? MIC_PROC VCC1 IC? GND1 RX_FIL
19 2 L1 15
R85 C2 R7 NC5 NC1 RSSI
C? 13 - R6 18 3 16
FLAT_AUDIO_IN R? R? OUT1- OUT1+ L? EXT_SPK+ VCO_CON
IC6D 14 17 4 17
R86 C?
R? IN1- MODE SQL
C161 12 R13 16 5 18
R? +
U?D
R? IN1+ SVRR TX_EN
2 R14 15 6 19
R? IN2+ SELECT VOL
C17 14 7 L2 20
C?
C? C?
MIC_IN VOL2 R? IN2- NC2 TX_PWR
13 8 21
R8 R? OUT2- OUT2+ L? INT_SPK+ BUT_IN_0
C121 C4 12 9 22
R9 NC4 NC3 FREQ_CON
11 10 23
C14 VCC2 GND2 BUT_OUT_1
24
+
PTT
C?
25
+
Q?
R42 R67 R? AUDIO_MUTE BUT_OUT_3
C?
5 U?B C3 Q11 26
R? R? + INT_SPK- R57 BUT_OUT_0
7 27
R209 IC6B C? VOL1 ENCODER0
R?
6 R15 28
AUDIO_IN R?
C?
R?
- ENCODER1
C87 29
R66 C103 ENCODER2
C222 Q21 30
R?
C8 ENCODER3
R49 31
C?
C9 T1 +5V
C? 32
INT_SPK+
C13 33
3
R1 R2 VOX_EN BAT_COM
R76 34
R75 MOD_OUT2
35
R25 VOX MOD_OUT1
5
+5V C7 D222 36
R? TONE_AUDIO C101
1 37
+
C8
C99 C65 4 38
R43 MOD_AUDIO IC102
U1
C6 D1
R7
3
C5
R? -
D2
C11 C130 R157 D1
R175 R178 R179 MIC_IN R4 R3
R82
8
R?
R6
R197 1
2
MOD1 R78 R79
5 IC2B C1 2
C? C? C?
+ EXT_DET CON1
J2
C100
R5
7 R80 3
C10
IC14 B EXT_SPK+
(VOICE) 6 4
C207 - EXT_SPK-
C205
R?
R?
R?
R?
C206 R183 5
C?
C212 EXT_OBJ1 R9
R39 6
4
EXT_MIC
7
FLAT_AUDIO_OUT
4 Q25 8
FLAT_AUDIO_IN
9
+5V R? Q? EXT_PTT EXT_PTT1
10
R60 INT_MIC
R?
+5V R77 11
INT_SPK+
12
EXT_PTT1 INT_SPK-
13
C? 14
L? L? MIC_IN EXT_OBJ2
D? 15
R? D7 +5V
L25 L34
R?
C192 R115 16
MOD_TONE R52 RXD
17
C98 TXD
8
18
C?
MOD2 R172 R107 R108 R109 Q39 RESET
R?
3 IC?A R191 19
R? R? R? R? + Q? R? EXT_MIC DA_LE
1 20
IC14A R138 FLDMO
(TONES) 2 21
- IN_MIC
C204 C139 C135 C174 C187
R?
22
C?
C?
C?
C?
C?
MIC_EN
5
4
C106 C105 C102 C104

R?
R116
C?
C?
R53 ENTEL HX400 Radios Series 2.0
C?
C?
Title: Contoller & Audio Processor Board

Project: HX400_2.0 File: CNTRL03.chm Page: 3/3
Page 59 of 80
Figure 9.4 RF PEC Block Diagram – All Models

A B C D E F G H
CON2 RX & TX LOCAL OSCILLATORS TX PA & ANTENNA SWITCH

1 BAT+
1 RTX5V TXB+ SWB+
J? 2
PLL_EN
3
PLL_LD
4 Q8 Q6
W/N VCOB+ Q7
5 RX_VCO U?
TX_LO U? U? U?
IC_CLK Q43 TX_LO
6
IC_DATA Q26 BUF_TX PRE DRIV P.A.
7
V?
AF VCO_CON
8 U?
ANT
TX_LED
9
RX_LED BUFFER
10 Q35 U?
BAT+ VCO_TUNE RX_LO
11
ANT?
SW_BAT BUF_RX ANT
12 U?
SWB+ Q4 Q10
13
V?
RX_EN MOD_OUT1 TX_VCO TX_PWR COMP LOW PASS FILTER 1
14
RX_FIL
15 IC9
RSSI
2 16
VCO_CON FIN RXB+
17 LOW PASS FILTER 2 RX_IN
SQL TXB+
18 & T/R SWITCH
TX_EN
19
VOL
20
TX_PWR
21
BUT_IN_0
22
FREQ_CON
23
BUT_OUT_1
24
PTT
25
26
BUT_OUT_3 FREQENCY SYSTHESIZER & 5V REGULATOR RECEIVER WITH SQL DETECTOR
BUT_OUT_0
27
ENCODER0 SWB+ RF_BPF RF_BPF
28 RX_IN U? MIX RX_LO
ENCODER1 RTX5V
SWITCH DRIVEN BY TX_EN & TX_EN

29 D?
LNA D? 1 2
ENCODER2
30 IC5 VOLTAGE Q5 J?
3 ENCODER3 +R5V
31 DOUBLER
3
5V REG RX_FIL D709
32 Q30-34,D8,13
33
BAT_COM VCOB+
Q13,14,40
34 RIPPLE VOLTAGE TO CON2
MOD_OUT2 PUMP RXB+
35 FILTER
MOD_OUT1 RSSI
TO CTL BRD VIA CON2

36 Q42 Q11,27,28,29 45.45MHz
VCO_TUNE
37
XTAL FIL IC1
38
FIN AF
138-220,35MHz (VHF) P IF SUB-SYSTEM
IC13
Q44
FREQUENCY TXB+ VCXO_REF
360.65-470MHz (UHF) R Q2,D14,22
TO CTL BRD VIA CON2
RX_EN SYNTHESIZER x3
1 NOISE
BUT_OUT_0 TX_EN CER1 CER2 SQL
DETECTOR
SW1 RXB+
S?
FREQ_CON
2 MOD_OUT2 TO ALL CKTS W/N
4 1 "L" = N
BUT_IN_0 VCO_CON 15,3MHz VXCO VCXO_REF
SW2 PLL_LD
S?
2
BUT_OUT_1 PLL_EN
1
IC_DATA U?
D?
+
SW4
S?
IC_CLK CN1
C?
2
C?
C?
C?
C?
BUT_OUT_3 C199 C194
2 D5
PTT BAT+
SW3 C142 C18 C177
S?
1
R49 SW_BAT
VOL1 4
D?
R? RX_LED R55 J? J?
CH1 1 3
D27 +R5V R? R? R?
CN2
2PIN1
R?
J?
D? R54 2 1
S? R52 R50
1 3 2 J?
ENCODER1 BCD VOL R?
J?
4 6
+R5V ENCODER2 ENCODER0
7 ENCODER 9
ENCODER3 BAT_COM
5
D?
2
5
8
D2 R51
D?
R? TX_LED ENTEL HX400 Radios Series 2.0
Title: RF Block Diagram
Project: HX400_2.0 File: RFBLK01.chm Page: 1/1
Number: 400.02.BLK1 Date: Sep. 27, 2008 Rev. : 2.0
Page 60 of 80
Figure 9.5 Synthesiser Circuit Diagram – VHF Models

A B C D E F G H
+7,2V from the ON/OFF switch

SWB+ R1
R155 R154 Q33 C62

C39
R?
47R 2.2K
C1
R149 R153 0.01U
T? C2 D1 D8
1 IC5 27K 6.8K 27K 6.8K Q32
R3
R5
IC?
R148 R150
1 5 C16 T? 0.01U
IN OUT R2 R4 R6
Q34 C97
R151 0.01U
C4
R218 4 T5 C38 T4 2.7K C3 D2
BYP R152 D13
T?
22P
R?
R7
47K
Q31 4.7K
3 Q30 C40
+
EN
C?
0.01U
C?
C?
C215 C37 R156
0.1U C172 C141
C220 10U/10V 22P R27
C?
0.1U 0.1U
C140 220R C150
C15 4.7U
C5
C6
0.01U
D29
R26
R262 R146 C132
C7
+R5V R8 +R3V 100R 1U
2 D3
Regulated +5V (to ALL circuits) 10R R24
R25
+
C265 1K
R213 +R5V
C14
10R
R24
+R5V 10U/10V R147
R9
C145 R129
R118 10K
T7
10R
R?
0.01U
10K R25 Q29
1 4 C13 T6
VCON VCC R11 R23
10K Q11
15,3MHz R31
2 3 C12 1 16 680R
GND O/P R10 OSCIN R R12
C68
JP1 R28
C?
R212 R42 Q27 680R R29
R?
VCXO 10R C67 2 15
OSCOUT P R13 R14
1K
T9
7P
R?
R30 10K Q28
R15
15,3MHz to RX Second Mixer (IF sub-system IC1) 3 14 470R
+
T8
VCXO_REF VP LD/FO R144 C33
C8
1.8K 2.2/16V
R16
3 4 13
FREQ_CON VCC ZC R19
IC13 1K
R17
+R5V C36 5 12 R145 C?
DO PS
+R5V R128 C41
C11
100R
C?
0.1U
C170 10K N/F
R?
+R5V 6 11
470P GND LE
8
R?
100K R168
R40 R221
8
R?
3 7 10 1K VCO_TUNE
R85 R? + XFIN DATA
5 10K 1
R? + IC8A C243
7 2 8 IC1 9
C10
C? +R5V
100K IC8B R? - IC2A 1000P FIN CLK
+ MB15 R53
R?
6 IC2B
C100 R39 - R184 C160
R?
C73 100K
4
100K
C?
0.1U 10K
C?
R22
R21
R20
R19
R18
10U/10V R180
4
R242 R243 R244 R205

22K 22K 22K 22K 22K
R206
R? R?
C74 TP
4 R54 R48 10K +R5V
MOD_OUT2 C? + R? 33K T10
Q38
10K
10U/10V
C9
C114
C49 0.01U
D?
C?
Q40 N/F
Q?
138-174MHz from TX LO
FIN Q14 PLL_LD
Q?
Q?
183,5-219,5MHz from RX LO Q13

D30 PLL_EN
TX_EN C90 D1 R158 IC_DATA
TXB+ 3.3K IC_CLK
R?
Q42
+ C?
RX_EN
D?
470P Q? R159
RXB+ R?
N/F
C128
C?
VCO_CON 10U/10V
C117
5 N/F
C?
RTX5V
VCOB+
ENTEL HX400 Radios Series 2.0
Title: Syntesizer & R/T Power Switch
Project: HX400_2.0 File: VHFSYN01.chm Page: 1/1
Number: 400.02.VH01 Date: Sep. 20, 2008 Rev. : 2.0
Page 61 of 80
Figure 9.6 VCO Circuit Diagram – VHF Models

A B C D E F G H
1
RTX5V TXB+
C83
C?
R249 0.1U
R?
220R
C256
VCOB+ R161 C?
R?
22 C?
L?
C154 C? C155 0.1U
4.7U 470P
R165 R160 L45
R?
R?
C156 10K 10K
C?
Q36 L42 470P TX_LO
2 C?
Q?
8P
C84 L?
C255
C?
C30
0.1U
Q?
9P
TC3 L41 C248 Q43
L24 D26 C?
6P R37
D?
L?
TC?
R?
L? L? 220R R248
D12
R?
D? C? R162 2,7K
Q26
L?
C249 C? L5
R?
330R
D?
C? N/F D32 R45 L22
R?
Q? 10K
C?
D4 L4 C21 R163 D? R143
VCO_CON 39P C87
C?
C?
C23 18R D9
D?
R?
R?
Q? R22 0R C245
Q37 3P C34
10P C24 220R
L?
R?
N/F
C?
1P R44
7P C?
C?
R?
3 2,7K
C45
C?
R58 5P
C?
Q?
Q35 C157
R?
8P 330R Q10
C?
Q?
C263 C26 RX_LO

1P
R164
R?
Q52 10K
6P L40 C5 R21 R47
L?
L43 C?
C253
C251 2,7K 47R
C?
8P
R?
R?
Q? R43
C? C17
R?
L? L? C162 10K L44
C?
L?
C77 91P 1N
TC2 1P Q4
C?
C250
TC?
0.1U
C?
0.1U
C?
N/F L20
C163 D15 R201
VCO_TUNE Q? C159
100K
D?
R?
C?
C252
4 C42 C? C? 2P
L? C?
C? C19 R246
15P C59
C?
C188 10P R8
R?
L3 R174 N/F 220R
N/F D3 C164 0R 100R
C?
R?
R?
N/F RXB+
C?
D?
MOD_OUT1 R167
R?
100R
FIN

Title: RX/TX VCOs & Buffers
Project: HX400_2.0 File: VHFVCO01.chm Page: 1/1
Page 62 of 80
Figure 9.7 Receiver Circuit Diagram – VHF Models

A B C D E F G H
RXB+ R2
R?
100R
C63 C82
C1A
C?
C?
C?
0.01U L7
RXB+ 4.7U 0.01U R139
1 56K 100K R1
R?
L?
C43 R140 100K
R17 24P
C?
R?
R?
RX_FIL 0.01U 4.7K C266 C71
C58 L13 L18
R? C? C? C?
L720 L8
1
L723 L23 RX_LO
R142 24P R141 27P C10 L? L?
4 3 1 5
C?
82P 100K 100P
C28 100K C76 C69 L? L?
R?
R?
RX_IN L19 L16 9P 16P
C? C? C?
D10
C?
C?
C?
C?
C?
2 4 2 2 T?
D?
Q?
L? L? Q5 C81 C158 C32
C?
C?
C?
C75 C29 C56 C72 C272 T?
30P 24P D11 6P 33P N/F 22P 22P N/F
D?
D?
5 1 3 4
C60 C35 D19 C51 C146
C?
C?
C?
C?
N/F D709
30P 24P 8P 30P
3
D?
D?
D20
N/F RSSI
CD601
VCC
2
RXB+
R12 R614
Y?
R?
2.2K
R?
220R C611 W/N
R11 C6
C?
C?
C?
1
C3 0.01U
C617
3.3K 0.01U
R?
C?
R?
0.01U
R613
1.8K C8
C108
C?
C?
0.01U AF
C7 0.1U R3
100P
R10 +
R719 L728 150K C? 0.01U R?
R?
51R 22K C?
C2
XF3
R?
R?
R772
L?
16
15
14
13
12
11
10
2.2U/10V
9
3.3K
C?
1 3 6 4 Q? Q20 Q? C4
R? Q3 470P
MX_I/P
GND
NREC
IF_O/P
QUAD
AF_O/P
NDET
RSSI
3 R9
220R 0.01U
L727 C126 C120
C131
C?
0.01U
2
C5 C? R92 220P C?
C?
C?
C?
L?
13P R?
IC?
IC1 SQL
2.2K
OSC_O/P
L?
L?
RXB+ R93 R13
OSC_I/P
MX_O/P
FIL_O/P
C774 C113 L14
FIL_I/P
2.2K 2.2K
C?
C?
L30
R?
R?
IF_I/P
82P 18P
VCC
DEC
C167 C125
0.1U 0.1U C112 R90
1000UH
C?
R?
VCC 1000UH 1U 100K
R7 Q?
1
8
100R Q19
R?
R253
22P
0.1U
C85
470K
R?
C171 VCC
470R R91
C259 C86 C91 C118 R89
C?
C?
C?
C?
C?
C?
R?
R88 0.1U
0.01U 4.7U 0.1U 0.1U C?
C119 47K
4.7K
L?
R?
R?
L46 R41 D22
4 C79 220K
560NH 0.01U R?
C?
D14
680K C? R6 C109 C111 D?
R? R? C? C?
R251 22K R? D?
D?
C?
VCXO_REF C257 22P C115
C? R105 0.1U
R?
Q? 0.01U D24 33R 0.1U
C264 C16
C?
R210 D23 R14 Q?

Q44 15P
1K C260 R?
C277 C110 C116
C?
C?
C?
47P D? Q2
330P CF3 CF4 22K C?
1000P 1000P
1 3 1 3 4.7U
R102
R110 33R
R?
R5 22K
R?
R?
22K R104
R?
2
4
2
4
Q?
5
R15 Q22
2.2K
R? ENTEL HX400 Radios Series 2.0
Title: Receiver VHF
Project: HX400_2.0 File: VHFREC01.chm Page: 1/1
Page 63 of 80
Figure 9.8 Transmitter Circuit Diagram – VHF Models

A B C D E F G H
BAT+ BAT1+
1
C?
SWB+ R217
R5
C50 0R
470P C27 C52
C?
C?
L11 470P 4.7U
R57
R3
N/F
L?
C?
R23 C175 L36 R20
C?
TXB+ R4 1000P R6
L?
100R 220R
1000P C47
C31 0.01U L1 L6
C15 C?
C?
0.01U L26 L27 47P
L?
L28
TXB+ 39P L? L?
L2 220NH Q8 L?
Q6
C? C? N/F N/F
C80 C180 C181 C183 C13 C11 C12
C48
Q2
Q1
R26 N/F
C?
C?
C?
C?
C176 C178 C179
C?
C?
C?
C?
C?
C?
2 C182
10K L? 9P C? N/F N/F N/F 33P 56P 10P C1
C?
R2
N/F
TX_LO T1 47P
Q7
L?
R219
C?
L12
L?
R27 20P 1UH
R1
4.7K L29
1UH
R245 R103 ANT
R18 R15
1K N/F
10K C44
L39 L10 L9 D6 C?
R246 C22 R101
C?
C?
C247
470P L? L? L? J? ANT
R17
R13
100K N/F 33K
D?
C186 1000P
C?
C246 C? C254 C?
3
0.01U 9P 7P
C185
C?
13P L7A R32
N/F
R24
C184 47K
C?
C?
C?
C46 C53
L?
C244 27P 10P
C?
20P
C122 0.01U
TXB+
L?
C?
BAT+ BAT1+ L15
R14
BAT+ TXB+ 1UH RX_IN
R97 4.7K
TXB+
R11
R166
R38 N/F
R23
D21
8
R21 IC1B R33

4
D?
4
5 220R
270K + R96 C54
C?
R34 IC9B 7 2 R18
R10 - R16 470P
R22
10K
R?
0R1 6 2.7K 1
R59 - IC9A R16
3
BAT+ R20 + 1K
4
Q?
270K IC1A Q1
8
C70 C? C134
C9
C?
TXB+
R12
100P 0.1U 100K

C? 10U/10V
R7
R4 Q9 Q?
C?
C?
2.2M
C190 C189 R137
0.1U R94 R98 C? C133
4.7U
R8
R9
68K 68K 0.1U
5 TX_PWR

Title: TX Power Amplifier, power control & Antenna Switch
Project: HX400_2.0 File: VHFTRM01.chm Page: 1/1
Page 64 of 80
Figure 9.9 Synthesiser Circuit Diagram – UHF Models

A B C D E F G H
+7,2V from ON/OFF switch

SWB+ R1
R155 R154 Q33 C62

C39
R?
47R 2.2K 0.01U
C1
R149 R153 T2 C2 D1 D8
1 IC5 27K 6.8K 27K 6.8K Q32
R3
R5
IC?
R148 C16 R150
1 5 T3 0.01U C97
IN OUT R2 R4 R6
Q34
C4
0.01U
R151
R218 4 T5 C38 T4 2.7K C3 D2
47K BYP R152 D13
R?
R7
220P 4.7K
3 Q30 Q31 C40
+
EN
C?
0.01U
C?
C?
C215 C37 R156
0.1U C172 C141
C? C220 10U/10V 33P R27
0.1U 0.1U
C140 220R C150
C15 4.7U
C5
C6
0.01U
D29
R26
R262 R146 C132
C7
T1
+R5V R8 +R3V 100R 1U
2 Regulated +5V (to ALL circuits) D3
10R R24
R25
+
C265 1K
R213 +R5V
C14
10R
R24
+R5V 10U/10V R147
R9
C145 R129
R118 10K
T7
10R
R?
0.01U
10K R25 Q29
1 4 C13 T6
VCON VCC R11 R23
10K Q11
15,3MHz R31
2 3 C12 1 16 680R
C68
JP1 R28
C?
R212 R42 Q27 680R 0.1U
R29
R?
VCXO 10R C67 2 15
OSCOUT P R13 R14
1K
T9
7P
R?
R30 10K Q28
R15
15,3MHz to RX Second Mixer (IF sub-system IC1) 3 14 470R
+
T8
VCXO_REF VP LD/FO R144 C33
C8
1.8K 0.22/35V
R16
3 4 13
FREQ_CON VCC ZC R19
IC13 1K
R17
+R5V C36 5 12 R145 C?
DO PS
+R5V R128 C41
C11
100R
C?
0.1U
C170 10K 0.01U
R?
+R5V 6 11
470P GND LE
8
R?
100K R168
R40 R221
8
R?
3 7 10 1K VCO_TUNE
R85 R? + XFIN DATA
5 10K 1
R? + IC8A C243
7 2 8 IC1 9
C10
C? +R5V
+ MB15 R53
R?
6 IC2B
C100 R39 - R184 C160
R?
C73 100K
4
100K
C?
0.1U 10K
C?
0.01U
R22
R21
R20
R19
R18
10U/10V R180
4
R242 R243 R244 R205

22K 22K 22K 22K 22K
R206
R? R?
C74 TP
4 R54 R48 10K +R5V
Q38
22K
10U/10V
C9
C114
C49 0.01U
D?
C?
Q40 N/F
Q?
404-470MHz from TX LO
FIN Q14 PLL_LD
Q?
Q?
357,65-423,5MHz from RX LO Q13

D30 PLL_EN
TX_EN C90 D1 R158 IC_DATA
TXB+ 3.3K IC_CLK
R?
Q42
+ C?
RX_EN
D?
470P Q? R159
RXB+ N/F
R?
C128
C?
VCO_CON 10U/10V
C117
5 N/F
C?
RTX5V
VCOB+
Project: HX400_2.0 File: UHFSYN01.chm Page: 1/1
Number: 400.02.UH01 Date: Sep. 20, 2008 Rev. : 2.0
Page 65 of 80
Figure 9.10 VCO Circuit Diagram – UHF Models

A B C D E F G H
1
RTX5V TXB+
C83
C?
R249 0.01U
R?
100R
C256
VCOB+ R161 C?
R?
22 C?
L?
C154 C? C155 0.01U
4.7U 470P
R165 R160 L45
R?
R?
C156 10K 10K
C?
Q36 L42 470P TX_LO
2 C?
Q?
8P
C84 L?
C255
C?
C30
0.1U
Q?
5P
TC3 L41 C248 Q43
L24 D26 C?
5P R37
D?
L?
TC?
R?
L? L? 220R R248
D12
R?
D? C? R162 4,7K
Q26
L?
C249 C? L5
R?
330R
D?
C? 470P D32 R45
L22
R?
Q? 10K
D4 L4 C21 R163 D?
VCO_CON 39P C87
C?
C?
C23 18R D9
D?
R?
Q? R22
Q37 2P C34
6P C24 220R
L?
R?
C?
1P R44
5P C?
C?
R?
3 2,7K
C45
C?
R58 6P
C?
Q?
Q35 C157
R?
5P 330R Q10
C?
Q?
C263 C26 RX_LO

1P
R164
R?
Q52 10K
N/F L40 C5 5P
L?
L43 R21 R47 C?
C253
C251
C?
8P
R?
R?
2,7K 47R R43
Q?
C? C17
R?
L? L? C162 10K L44
C?
L?
C77 10P 220P
TC2 0.5P Q4
C?
C250
TC?
0.1U
C?
C?
N/F L20
C163 D15 R201
VCO_TUNE Q? C159
10K
D?
R?
C?
C252
4 C42 C? C? 2P
L? C?
C? C19 R246 0.01U
5P C59
C?
C188 5P R8
R?
L3 R174 N/F 220R
470P D3 C164 0R 100R
C?
R?
R?
N/F RXB+
C?
D?
MOD_OUT1 R167
R?
100R
FIN

Project: HX400_2.0 File: UHFVCO01.chm Page: 1/1
Number: 400.02.UH02 Date: Oct.10 , 2008 Rev. : 2.0
Page 66 of 80
Figure 9.11 Receiver Circuit Diagram – UHF Models

A B C D E F G H
RXB+ R2
R?
100R 100K R139

C63 C82 C1 N/F R140 100K
C?
C?
C?
R?
R?
L1 8P
0.01U 0.01U C56 C43
RXB+ 4.7U R1 C51
1 100NH
56K C?
R?
L?
R18 C28
RX_FIL 4.7K 0.01U C? C?
C29 L17
R? C? 5P C? 0R L720 D709
D11 L8
D?
D?
1
D10 L723 L23 RX_LO
C35 100K C14 L? R?
C?
R141 18P 4 3 1 5
C?
0.01U R142 C69 100P L35 L? L?
100K
R?
R?
7P
C?
C76
C?
C?
C?
C58 C75 L18 L6 2 4 2 2 T?
D?
RX_IN C? C?
Q?
Q5 C32
N/F C72 C81 C158
C?
C?
C?
C143 T?
L?
L?
5P 6P 18P 18P 18P
5 1 3 4
6P D20 D?
5P D19
D?
3
C146
C?
C?
C?
N/F 3P
C274 RSSI
C147
6P L18 L6
2
L?
L?
CD601
VCC
2
R12 R614
Y?
RXB+ R?
2.2K
R?
220R C611 W/N
R11 C6
C?
C?
C?
1
C3 0.01U
C617
3.3K 0.01U
R?
C?
R?
0.01U
R613
1.8K C8
C108
C?
C?
0.22U AF
C7 0.1U R3
100P
560NH R10 +
R719 L728 150K C? 0.01U R?
R?
51R 22K C?
C60
XF3
R?
R?
R772
L?
16
15
14
13
12
11
10
2.2U/10V
9
3.3K
C?
1 3 6 4 Q? Q20 Q? C4
R? Q3 470P
MX_I/P
GND
NREC
IF_O/P
QUAD
AF_O/P
NDET
RSSI
3 R9
L727 220R 0.01U
C126 C120
C131
C?
150NH 0.01U
2
C5 C? R92 220P C?
C?
C?
C?
L?
13P R?
IC?
IC1 SQL
2.2K
OSC_O/P
L?
L?
RXB+ R93 R13
OSC_I/P
MX_O/P
FIL_O/P
C774 C113 L14
FIL_I/P
2.2K 2.2K
C?
C?
L30
R?
R?
IF_I/P
82P 18P
VCC
DEC
C167 C125
0.1U 0.1U C112 R90
1000UH
C?
R?
VCC 1000UH 1U 100K
R7 Q?
1
8
100R Q19
R?
R253
22P
0.1U
C85
470K
R?
C171 VCC
470R R91
C259 C86 C91 C118 R89
C?
C?
C?
C?
C?
C?
R?
R88 0.1U
0.01U 4.7U 0.1U C?
C119 47K
4.7K
L?
R?
R?
L46 R41 D22
4 220K
560NH C79 0.01U R?
C?
0.1U D14
680K C? R6 C109 C111 D?
R? R? C? C?
R251 22K R? D?
D?
C?
C? R105 0.1U
R?
Q? 0.01U D24 33R 0.1U
C264 C16
C?
R210 D23 R14 Q?

Q44 15P
1K C260 R?
C277 C110 C116
C?
C?
C?
47P D? Q2
330P CF3 CF4 22K C?
1000P 1000P
1 3 1 3 4.7U
R102
R110 33R
R?
R5 4.7K
R?
R?
22K R104
R?
4.7K
2
4
2
4
Q?
5
R15 Q22
1.5K
R? ENTEL HX400 Radios Series 2.0
Title: Receiver UHF
Project: HX400_2.0 File: UHFREC01.chm Page: 1/1
Number: 400.02.UH03 Date: Sep. 23, 2008 Rev. : 1.0
Page 67 of 80
Figure 9.12 Transmitter Circuit Diagram – UHF Models

A B C D E F G H
BAT+ BAT1+
1
C?
SWB+ R217
R5
C50 0R
C27 C52
470P
C?
C?
L11 4.7U 470P
R57
R3
N/F
L?
C?
R35 C175 L36 R20
C?
TXB+ R4 1000P R6
L1
L?
100R L28 470R L31
1000P
C31 0.01U
L27 C15
C?
0.01U L26
L?
TXB+ 33P L?
L2 220NH Q8 L?
Q6
C? C13 C183
2 C80 N/F 4P
C48
Q2
Q1
R26 C12
C?
C?
C?
C?
C?
C176 C11
C?
C?
C?
C?
C?
10K L? 7P C? C178 C181 3P N/F
C? C10 C179 C180 C182
R2
27P 18P N/F 27P 8P

T1 5P N/F
TX_LO Q7
C?
C?
L12
L?
R27 8P C2
R1
4.7K R219 L29 6P

R?
100R 220NH
R245 R103 ANT
R18 R15 C47
C?
1K 10K 100P
L39 L10 L9 D6 C44
TXB+ BAT+ R246 C22 R101
C?
C?
C?
C247
470P L? L? L? J? ANT
R17
R13
100K 470P 33K
D?
3 C186 1000P
C?
C246 C? C245 C?
R23 N/F N/F N/F

100K C185
C?
R?
N/F R32
2P L7
R24
C184 47K
C?
C?
C?
C46 C53
L?
Q?
Q1 C244 13P 11P
C?
10P
Q?
Q9
C122 0.01U
C?
BAT+ BAT1+ L15
L?
R14
220NH
R97 4.7K
TXB+
R11
R166 R33
4 R38 N/F
8
R21 IC1B R23 TXB+ RX_IN

4
5 220R
270K + R96
R34 IC9B 7 2
R10 - R16
R22
C?
0R1 6 2.7K 1 C54 D21
R59 - IC9A R16
D?
3 470P
BAT+ R20 + 1K
4
270K IC1A
8
C70 C? C134
C9
C?
R12
470P 0.1U 100K TXB+

C? 10U/10V
R7
R4
C?
C?
2.2M
C190 C189 R137
0.1U R94 R98 C? C133
R8
R9
4.7U 68K 68K 0.1U
5
TX_PWR
Project: HX400_2.0 File: UHFTRM01.chm Page: 1/1
Number: 400.02.UH04 Date: Oct. 10, 2008 Rev. : 2.0
Page 68 of 80
Figure 9.13 Synthesiser Circuit Diagram – 66-88MHz Models

A B C D E F G H
+7,2V from the ON/OFF switch

SWB+ R1
R155 R154 Q33 C62

C39
R?
47R
C1
2.2K 0.01U
R149 R153 C2
1
T2 D1 D8
IC5 R148 6.8K 27K 6.8K Q32
R3
R5
IC?
27K C16 R150
1 5 T3 0.01U
IN OUT R2 R4 R6
Q34 C97
0.01U
C4
R151
R218 4 T5 C38 T4 2.7K C3 D2
BYP R152 D13
T1
220P
R?
R7
47K
Q31 4.7K
3 Q30 C40
+
EN
C?
0.01U
C?
C?
C215 C37
0.1U C172 C141
C220 10U/10V 33P R27
C?
0.1U 0.1U
C140 R156
C15 C150
100R
C5
C6
1U 4.7U
D29
C132
R26
R262 R146
C7
+R5V R8 +R3V 100R 1U
2 Regulated +5V (to ALL circuits) D3
10R R24
R25
+
R213 1K
C265 +R5V
C?
C14
10R
R24
+R5V 10K
R9
0.01U 10U/10V R129
R147
T7
C145 10R 10K
R?
C152
R118 R25 0.1U Q29
1 4 C13 T6
VCON VCC R11 R23
10K Q11
15,3MHz 1.8K
2 3 C12 1 16 R31
JP1 R28
R212 R42 Q27
820R
R?
VCXO 10R C67 2 15 R29
OSCOUT P R13 R14
T9
7P 0R
R?
R30 10K
R15
15,3MHz to RX Second Mixer (IF sub-system IC1) 3 14 470R R144
+
T8
VCXO_REF VP LD/FO 1.8K C33
4.7/16V
C8
Q28
R16
4 13
C?
3 FREQ_CON VCC ZC
C153 R19
IC13 1K
R17
+R5V 5 12 0.1U R145 C?
C36 DO PS
+R5V R128 100R C41
C11
C?
0.1U
C170 R?
10K 0.1U
+R5V 6 11
470P GND LE
8
R?
100K R168
R40 R221
8
R?
3 7 10 5.6K VCO_TUNE
R85 R? + XFIN DATA
5 10K 1
R? + IC8A C243
7 2 8 IC1 9
C10
C? +R5V
+ MB15 R53
R?
6 IC2B
C100 R39 - R184 C160
R?
100K
4
100K C73
C?
0.1U 10K
C?
0.1U
R22
R21
R20
R19
R18
R180
4
15U R242 R243 R244 R205

22K 22K 22K 22K 22K
R206
R? R?
C74 TP
4 R54 R48 10K +R5V
Q38
10K
10U/10V
C9
C114
C49 0.01U
D?
C?
Q40 N/F
Q?
66-88MHz from TX LO
FIN Q14 PLL_LD
Q?
Q?
112,35-134,35MHz from RX LO Q13

D30 PLL_EN
TX_EN 470P R158 IC_DATA
C90 D1
TXB+ 3.3K IC_CLK
R?
Q42
+ C?
RX_EN
D?
Q? R159
RXB+ N/F
R?
C128
10U/10V
C?
VCO_CON
C117
5 N/F
C?
RTX5V
VCOB+
ENTEL HX400 Land Radios series 2.0
Project: HX400_2.0 File: MBSYN01.chm Page: 1/1
Number: 400.02.MB01 Date: Nov 9, 2008 Rev. : 2.0
Page 69 of 80
Figure 9.14 VCO Circuit Diagram – 66-88MHz Models

A B C D E F G H
1
RTX5V TXB+
C83
C?
0.01U
R249
R?
680R
C256
VCOB+ R2 C?
R?
10R C64 C?
L?
C57 0.01U
4.7U
C?
0.01U
C503 C84
C?
0.1U 0.1U R524 R165 R160
10K L45
R?
R?
R?
C?
C156 10K 10K
C?
Q36 0.1U TX_LO
2 C?
Q?
15P
R534
C255 C30
R?
10K L502
18P
R?
0R Q?
30P C? Q43
L508 C523 R37
3 C527
R?
D?
2
Q? 100R R248
R? Q501 D12
R?
L? R162 4,7K
0R
L?
R?
C? 330R
D?
D501 C522
L?
C?
C95 0R 0R
D?
1 15P R533 R532 R45

C? 470P L22
R?
L507 R? R? 15K
R163 D?
VCO_CON
18R D9
R?
Q?
C520 L503
C525
C?
Q37
R?
30P 220R R44
100P
C?
C?
R?
3 2,7K
C1
C?
Q? C157 R58 C?
1U Q4
R?
47P 330R Q10
C?
Q?
C531 C253
C26 RX_LO
R535 100P 22P
3K9 R164
R?
R?
Q52 10K C?
L?
R21 R47 47P
220R
C?
R?
R?
10K R43
Q?
R536 C17
R?
C540 10K L44
C504 10K
C?
C?
1N
R?
0.1U 0.01U
L512
33P
0R C533
L?
VCO_TUNE 3 C102 C159

D?
2 C?
4 R?
Q?
Q502 47P C252
C?
L? R46 0.01U
C?
C502
R?
L509 D502 C? 220R
C534 C529
C?
L?
C?
470P 0R
D?
1 1.5P 27P L3 R502 RXB+

L511 R? R?
0R R167
L4
R?
D503 C45 100R
C?
220R
R?
R522 56P
D?
R?
MOD_OUT1 R523 R505 10K

R? R?
0R 0R
FIN
ENTEL HX400 Land Radios Series 2.0

Project: HX400_2.0 File: MBVCO01.chm Page: 1/1
Page 70 of 80
Figure 9.13 Receiver Circuit Diagram – 66-88MHz Models

A B C D E F G H
R716
R?
C762 390R
RXB+ C63 R717
C1A 10K 1K L713
C?
C?
C?
R?
0.01U R708
4.7U 0.01U R702
L?
1 RXB+ R?
100K
R?
L725
C43 C43 C?
15P 150P
C?
C?
RX_FIL 150P
0.01U 10R C706 C768 C707 L?
R706 R718 C? C? C? C? C?
L720 L8 0R
1
C733 L723 RX_LO
1.5K R?
L23
R702
R?
4 3 1 5
D?
D?
R?
100K 47P L?
R?
150P 39P C777 C760

C?
C703 C729 D704
L?
L707 39P 0.022U 2 4 2 2 T?
D?
RX_IN C? C?
Q?
Q5 C81 C158
C?
C?
T?
C? L706 C780
C767 33P 33P
C?
C?
C?
R707 C734 10P 5 1 3 4
D?
D?
L?
C704 C761
5.6K 470P 470P
R?
0.01U D709
D703 R710
L?
3
0R
C?
L704
R?
L705
C712 C732
C?
C?
C727
L?
470P 470P RSSI

7P
2
CD601
VCC
2
RXB+
R12 R614
Y?
R?
2.2K
R?
220R C611 W/N
C6 C?
C?
C?
R11
1
C3 0.01U
C617
0.01U R?
3.3K
C?
R?
0.01U
R613
C108 1.8K C8
C?
C?
0.1U AF
C7 0.1U R3
100P
R10 +
R719 L728 150K C? 0.01U R?
R?
51R 22K C?
C19
XF3
R?
R?
R772
L?
16
15
14
13
12
11
10
10U/10V
9
3.3K
C?
1 3 6 4 Q? Q20 Q? C4
R? Q3 470P
GND
NREC
MX_I/P
IF_O/P
QUAD
AF_O/P
NDET
RSSI
3 R9
L727 220R 0.01U
C126 C120
C131
C?
0.01U
2
C5 C? R92 220P C?
C?
C?
C?
L?
13P R?
IC?
IC1 SQL
2.2K
OSC_O/P
L?
L?
RXB+ R93 R13
OSC_I/P
MX_O/P
FIL_O/P
C774 C113 L14
FIL_I/P
2.2K 2.2K
C?
C?
L30
R?
R?
IF_I/P
82P 18P
VCC
DEC
C167 C125
0.1U 0.1U C112 R90
1000UH
C?
R?
VCC 1000UH 1U 100K
R7 Q?
1
8
100R Q19
R?
R253
22P
0.1U
C85
470K
R?
C171 VCC
470R R91
C259 C86 C91 C118 R89
C?
C?
C?
C?
C?
C?
R?
R88 0.1U
0.01U 4.7U 0.1U 0.1U C?
C119 47K
4.7K
L?
R?
R?
L46 R41 D22
4 C79 220K
560NH 0.01U R?
C?
D14
680K C? R6 C109 C111 D?
R? R? C? C?
R251 22K R? D?
D?
C?
C? R105 0.1U
R?
Q? 0.01U D24 33R 0.1U
C264 C16
C?
R210 D23 R14 Q?

Q44 15P
1K C260 R?
C277 C110 C116
C?
C?
C?
47P D? Q2
330P CF3 CF4 22K C?
1000P 1000P
1 3 1 3 4.7U
R102
R110 33R
R?
R5 22K
R?
R?
22K R104
R?
2
4
2
4
Q?
5
R15 Q22
2.2K
R? ENTEL HX400 Land Radios Series 2.0
Title: Receiver
Project: HX400_2.0 File: MBREC01.chm Page: 1/1
Page 71 of 80
Figure 9.14 Transmitter Circuit Diagram – 66-88MHz Models

A B C D E F G H
BAT+ BAT1+
TXB+
1
C?
R705
SWB+ R217 R?
R5
C50 0R 220R
C52
470P C27
C?
470P
C?
L11 4.7U C754
L?
C?
R57
L711 0.022U
R3
N/F
L?
R20 1UH
C?
R35 C175 L36 R?
C?
TXB+ R4 1000P 470R
L?
150R C15
C31 33P 0.01U L702 L712 L31
C?
L6 470P C?
0.01U C10
L?
L7 C12
TXB+ L? L? L?
L2 Q8 L? L?
Q6
C? C? 100P
C748
C80 C705 47P D6
C48
Q2
Q1
R26 C11 C13 C713 C749
C?
C?
D?
L5
C?
C?
C?
2 C14
10K L? C? 7P 22P
18P 150P 30P
C?
R2
L?
TX_LO T1 47P
Q7
C?
L12
R27 15P R219 L708
R1
R?
4.7K 100R
L?
RX_IN
R245 R103 L29
R18 R15 R?
10K 10K 470R

D701 D710
C247
D?
D?
R246 C22 R101
C?
C?
0.022U 0.022U
R17
R13
33K 33K
C784
C?
0.01U
ANT
3
L1 L710 L709
L? L? L? J? ANT
C?
C246 C? C728 C? C714
C122 0.01U 18P 18P 18P
R709
R24
47K
C? C184 C244 C770 C781
BAT+ BAT1+
C?
C?
C?
C?
47P 47P 39P
TXB+ R14 56P
R97 4.7K
R38
8
R21 IC1B
4
4
5
270K + R96 BAT+ TXB+
R34 IC9B 7 2
R10 - R17
R22
0R1 6 2.7K 1
R59 - IC9A R16
3
BAT+ R20 + 1K
4
270K IC1A
R23
8
C70 C?
C9
C?
100K
R?
R12
470P C? C134 100K 10U/10V

R7 0.1U R4 TXB+
C?
C?
Q?
2.2M Q1
C190 C189 R137
4.7U 0.1U R94 R98
R8
R9
68K 68K
Q?
Q9
5 TX_PWR
ENTEL HX400 Land Radios Series 2.0

Project: HX400_2.0 File: MBTRM01.chm Page: 1/1
Page 72 of 80
Page 73 of 80
Page 74 of 80
Page 75 of 80
Page 76 of 80
Page 77 of 80
Page 78 of 80
Figure 9.23 HX4Xx Control Board, TOP VIEW
Page 79 of 80
Figure 9.24 HX4Xx Control Board, BOTTOM VIEW

Page 80 of 80

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HX400_Manual_V2 00.

It is constructed with a microprocessor controlled, temperature compensated Phase Locked Loop

The transceiver includes the following features:

The Radio also has an extensive range of accessories.

1.1. Model Numbers

HX42x are VHF models.

HX4x2 have no display or keypad

Items Model Quantity

The HX400 Series is supported by a wide range of useful accessories.

CSAHX 1-way dual slot rapid charger, 110/230v operation

3. OPERATING THE RADIO

These are described, in turn, in the following sections.

4.1. THE MICROPROCESSOR

IC5 and IC4 communicate via a 2 wire serial bus.

IC5 IC4 R207 R210

R50 R51 R10 R41 C11 C6 C7 C22

4.1.1. Microprocessor I/O Signals.

The following is a list of input signals to IC5 and their meaning:

7041_IRQN Interrupt Request from the CMX7041 Audio Processor

BUT_IN_0 to 4 The state (pressed or not) of the various switches

4.1.2. Switch Operation

SW1 TO SW19, SW25, R133 R106 R83 R61 R63

Q16 Q2 R3 R12 R125 R126 D15 TO D20

4.1.4. Microprocessor Clock and Beat Shift Function

The Microprocessor clock frequency (15.36MHz) is controlled by XT2 and associated

Q3 R62 R22 R64 C96 C95 C10 XT2

4.1.5. Microprocessor Reset

4.1.6. Discrete Control Signals

• TX_PWR Transmit Power Level

IC9 R29 R30 R31

4.2. AUDIO AND TONE SIGNALLING CIRCUITS

The Audio processor is clocked by Crystal XT4 at 19.2 MHz.

Functionality may be divided into Transmit and Receive paths.

Each of those paths may be further sub-divided into:

4.2.1. Received Voice Audio Processing

IC6a R194 R192 R195 C168 C217 C107 C218 IC3

C2 C4 R6 R7 R8 R9 R13 R14 L1 L2 C35 C3 R57 L9 C15

Q5 R45 R19 R21 C37

4.2.2. Received Tone Processing

4.2.3. Transmit Audio Processing

IC6d C121 C17 C18 R85 R86 R68 IC3

Levelled audio is further filtered and buffered by IC14b (MOD_AUDIO).

IC14b R175 R178 R179 R43 R183 R197 C205 C206

IC9 R18 R40 R26 R27 C16

4.2.4. Transmit Tone Processing

IC9 R40 R18

IC9 R32 R33 C23

4.3. SYNTHESIZER SECTION

IC13 VCXO D29 C265 R262 R129 R213

Figure 4.1 Synthesizer Block Diagram

4.3.1. Reference Oscillator

4.3.2. Voltage Doubler.

4.3.3. Loop Filter

R28 R29 R168 R53 C33 C41 C68 C160

4.3.4. Transmit VCO

VHF-UHF Q4 D3 D15 C251C188C250 C163 C164 C162 C19 C5 C42

4.3.5. Receive VCO

4.3.6. VCO Power Switching and Buffering