Elenos Elr100a

USE AND MAINTENANCE MANUAL
Edition 1
Rev. 1 - 15/12/2005
Code MAN0112
TECHNICAL
SECTION
Via G. Amendola 9 - 44028 Poggio Renatico (FE) - Italy
Ph. +39 0532 829 965 - Fax +39 0532 829 177
E-Mail: eng_dept@elenos.com
Web Site: www.elenos.com
RADIO LINK
RECEIVER
ELR 100A 600 to 1000 MHz 6W
ELR 200A 1700 to 1850 MHz 5W
ELR 200B 2300 to 2500 MHz 5W
Use and maintenance manual
Page 2
Engineering Department PHONE: +39 0532 829 965 - FAX: +39 0532 829 177
AVVISO IMPORTANTE
Il presente apparato utilizzabile solo da
titolari di Concessioni Governative
e/o Autorizzazioni Ministeriali
Elenos Srl
WARNING
The use of this device
is subject
to National Regulations.
Elenos Srl
Page 3
ELR100 - ELR200 RECEIVER SOFTWARE MENU
Main menu
Rx signal level menu Frequency setting menu
Composite deviation menu Audio level menu
Subcarrier deviation menu Squelch level menu
Page 4
VIEW OF THE RECEIVER
View of the receiver with sliding chassis
View of the extractable chassis with modules
Page 5
RECEIVER: extractable chassis with
mounted boards overview
RECEIVER: chassis with bus
connection mounted underview
RECEIVER extractable chassis:
mounted boards in particular
RECEIVER extractable chassis:
power supply board in particular
RECEIVER: ELR200 Front-end
box view
Page 6
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
5 5
4 4
3 3
2 2
1 1

15KHZ LOW PASS FILTER
(Board 2PCB0293_**)
L
O

i
n
JF4 JF5
Coax cable
JF6
JF6
JP2
2nd FILTER
LOW NOISE
AMPLIFIER
1st FILTER
RF INPUT
FRONTAL PANEL
MOTHER BOARD
(Board 2PCB0291_**)
(Board 2PCB0290_**) (Board2PCB0288_**)
(Board 2PCB0289_**)
(Board 2PCB0287_**)
AUDIO PROCESSOR
Coax cable
(Board 2PCB0281_**)
PUSHBUTTONS (2PCB0287_**)
1
( 2PCB0292_0)
(Board 2PCB0295_**)
(Plug-In)
MONITOR
(Plug-In)
FILTER
DISPLAY
JF7
FREQ. SINTHESIZER & VCO
IF AMPLIFIER & DEMODULATOR &
FRONTAL
Coax cable
Coax cable
IF out IF in
CPU
IF monitor
Coax cable
IF
R
F

i
n
p
u
t
PWS
JMB1
10 1
AC INPUT
EXT. DC
JP8
4 1
27Vac
110V
220V
240V
0
(Board 2PCB0283_**)
JP5
10 1 10 1
JP4
JP3
10 1
(Board 2PCB0296_1)
ELR100:
ELR200:
(Board 2PCB0339_0)
FREQ. SINTHESIZER
FREQUENCY CONVERTION FREQUENCY CONVERTION
ELR100:
ELR200:
(Board 2PCB0341_**)
1 1
GENERAL SCHEMATIC RX
GENERAL SCHEMATIC RX
ELR RECEIVERS
/
V1.1
Size Date Sheet of
Design: Pcb Code:
Schematic:
Model: Board Code:
Approved:
B
A
T
T
. L
E
D
R
X
S
IG
N
A
L
A
U
X
B
A
T
T
. L
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D
-
1
2
V
D
G
N
D
D
G
N
D
+
5
V
+
1
2
V
+
1
2
V
+
5
V
+
5
V
+
5
V
+
1
2
V
D
G
N
D
+12V
+
1
2
V
G
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D
G
N
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A
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N
A
L
+
1
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+
5
V
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N
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1
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V
-
1
2
V
-
1
2
V
-
1
2
V-
1
2
V
+
1
2
V
Smb
JC4
JP2
1
Smb
JC8
JP1
1
2
JC1 "N"
JP2 1
JC7
Bnc
JF1 CON14
1234567891
0
1
1
1
2
1
3
1
4Smb
JC7
JF3
CON20
JF2 CON10
123456789
1
0
JP8
CON4
1234
Smb
JC6
JF8
CON10
Smb
JC4
JF3
CON20
JR1
EXT DC +
1
Smb
JC1
JF1 CON14
123456789
1
0
1
1
1
2
1
3
1
4
Line
input
fuse
Voltage
selector
JR3
AC LINE
G
01
1
0
2
2
0
2
4
0
Smb
JC6
JF2
CON10
1234567891
0
EXT. DC
JR2
EXT DC -
1
Smb
JC8
JP2
1
FUSE T2A
MAINS
T1
JF8
CON10
Via G. Amendola 9 44028 Poggio Renatico (FE) Italy
Tel +39 0532 829965 Fax +39 0532 829177
Website WWW.ELENOS.COM
(
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Page 7
EXT. D C
+ -
+
COAX CABLE
WIRE &
FLAT CABLE
JP2
AC LINE
DL5
Pl3
H5
JC4
ELRSAL010
Pl
P2
P3
DL4 P4
ELRSAL011
+l2v
Hl
JP2
JP2
SINT. RX 100
PCB: 2PCB0296_*
BOARD: ELR3408_***
IF AMPLIFIER
PCB: 2PCB0290_*
BOARD: ELR5401_***
DEMODULATOR
PCB: 2PCB0288_*
BOARD: ELR6408_***
ELRSAL008
JC1
ELRSAL005
JC7 JC8
ELRSAL003
JF8
ELRSAL007
JF8
JP8
Pushbuttons
(CPU RX)
JF1
FRONTAL RX
PCB: 2PCB0289_*
LP 15KHz
PCB: 2PCB0281_*
BOARD: ELTR4409_***
RF IN
IF
MONITOR
CPU RX PCB:
2PCB0287_* BOARD:
ELR0408_***
I
0
AC
LINE
I
0
EXT.
D.C.
ELR 100A RECEIVER CABLINGS
Page 8
EXT. D C
+ -
COAX CABLE
WIRE &
FLAT CABLE
AC LINE
JP1
ELRSAL010
ELRSAL011
+l2
l
JC6
JC4
JP2
JP2
PLL RX 200
PCB: 2PCB0339_*
BOARD: ELR4401_***
IF AMPLIFIER
PCB: 2PCB0290_*
BOARD: ELR5401_***
DEMODULATOR
PCB: 2PCB0288_*
BOARD: ELR6408_***
JC1
JC7 JC8
ELRSAL008
JF8
ELRSAL005
Pushbuttons
(CPU RX)
ELRSAL003
FRONTAL RX
PCB: 2PCB0289_*
LP 15KHz
PCB: 2PCB0281_*
ELRSAL007
JF8
JP8
JF1
BOARD: ELTR4409_***
RF IN
IF
MONITOR
CPU RX PCB:
2PCB0287_* BOARD:
ELR0408_***
I
0
AC
LINE
I
0
EXT.
D.C.
ELR 200B RECEIVER CABLINGS
Page 9
EXT. D C
+ -
COAX CABLE
WIRE &
FLAT CABLE
AC LINE
JP1
ELRSAL010
ELRSAL011
+l2
l
JC
JC4
JP2
JP2
PLL RX 200
PCB: 2PCB0339_*
BOARD: ELR4401_***
IF AMPLIFIER
PCB: 2PCB0290_*
BOARD: ELR5401_***
DEMODULATOR
PCB: 2PCB0288_*
BOARD: ELR6408_***
JC7 JC8
ELRSAL008
JF8
ELRSAL005
Pushbuttons
(CPU RX)
ELRSAL003
FRONTAL RX
PCB: 2PCB0289_*
LP 15KHz
PCB: 2PCB0281_*
ELRSAL007
JF8
JP8
JF1
BOARD: ELTR4409_***
RF IN
IF
MONITOR
CPU RX PCB:
2PCB0287_* BOARD:
ELR0408_***
I
0
AC
LINE
I
0
EXT.
D.C.
ELR 200A RECEIVER CABLINGS
Page 10
AA
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Page 11
POWER SUPPLY Board Description
(ELTR0401_1 - 2PCB0283_1)
The ELTR0401_1 POWER SUPPLY BOARD is used to supply all receivers ELR Series together with RF PA power supplies.
From the JP1 connector comes the alternate voltage from the secondary of the power supply transformer (ca. 27Vac)
that is rectified by the diodes bridge B1 and smoothened by electrolytic capacitors C11 and C12. Through the D5 diode
the external battery voltage is connected at the output of the bridge, and it enters from the JP2 connector.
These voltages (mains or batteries) enters in a SWITCHING circuit that haas U5 and T1 as main components; the T1
transformer has three outputs supply the three voltages supplying the whole equipment - once they have been rectified
and stabilized with the U3 U4 and U6 regulators. These three voltages are: +5V, +12V and -12V.
The presence of these votlages is indicated by the DL1 DL3 and DL5 diode leds mounted on the power supply, and by
the led munted on the front panel of the equipment.
The DL4 led and the EXT. DC led on the front panel indicates the presence of the external battery voltage.
The circuit for temperature measurement and thermostaic control of the fan is mounted only on transmitters.

ADJUSTJMENTS:
Adjust the VR1 trimmer in order to obtain a voltage of 14,5-15V at the U4 regulator input (pin 1).
Page 12
Page 13
55
44
33
22
11
D
D
C
C
B
B
A
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4
1
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R X S I G N A L
R X S I G N A L
- 1 2 V
G N D
+ 1 2 V
- 1 2 V
+ 1 2 V
+ 1 2 V
G N D
G N D
- 1 2 V
+ 1 2 V
+ 5 V
+ 5 V
+ 5 V
D G N D
+ 5 V
+ 1 2 V
- 1 2 V
+ 5 V
P W S T E M P
D G N D
+ 1 2 V
- 1 2 V
P W S T E M P
B A T T E R Y L E D
B A T T E R Y L E D
+ 1 2 V
- 1 2 V
+ 5 V
B A T T E R Y L E D
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Page 14
BUS RX board Description
(ELR1408_1 - 2PCB0292_1)
The BUS RX board secures interconnections between boardsand supplies them with power. These boards are:
ELT100 RECEIVERS (600 1100 MHz)
1. PWS board (ELTR0401_1 - 2PCB0283_1)
2. SINTHESIZER RX 100 board (ELR3408_1 \ 2PCB0296_1)
3. IF AMPLIFIER ELR100 board (ELR5400 \ 2PCB0290_0)
4. DEMODULATOR (ELR6408_1 \ 2PCB0288_1)
ELT200 RECEIVERS (1400 2500MHz)
1. PWS board (ELTR0401_1 - 2PCB0283_1)
2. PLL RX 200 Board (ELR4401_0 \ 2PCB0339_0)
3. IF AMPLIFIER ELR200 Board (ELR5401 \ 2PCB0290_1)
4. DEMODULATOR (ELR6408_1 \ 2PCB0288_1)
ADJUSTMENTS:
Su questa scheda non ci sono punti di taratura.
Page 15
Page 16
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Page 18
CPU RX Board Description
(ELR0408_1 - 2PCB0287_1
The CPU RX controls the main parameters of the receiver and manages the functionning of the graphic LCD.
On this board are: a 8 Bit microprocessor (U1), a 12 bit analog/digital converter with an 8 channel multiplexer (U13),
a 256K EPROM (U4) and a 256K RAM (U3).
The microprocessor controls the graphic display and gives the timings and signals for the functionning of the whole
board. It controls also the frequency synthesizer (U2) installed onthe SYNTHESIZER RX 100 board (ELT3408) for the ELR
100 models, the frequency synthesizer (U1) installed on the PLL RX 200 board (ELR4401) for the ELR 200 models, and
the audio amplifier at programmable gain (U1) on the FRONTAL RX (ELR2408).
The board is supplied through the JP8 connector with three voltages : +12V, -12V and +5V.
ADJUSTMENTS:
This board doesnt need adjustments.
NOTE: The JP9, JP10, JP11 e JP12 jumpers are adjusted in the factory and must not be moved.
Page 19
Page 20
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Page 21
DEMODULATOR Board description
(ELR6408_1 - 2PCB0288_1)
The DEMODULATOR board contains the second convetion at 1.3MHz, the impulse discriminator, the audio MPX
processor and the circuits for deviation and centre tuningmeasurements.
The IF signal at 10,7 dBm with 0 dBm evel comes from the JC8 connector and, together with the 12MHz ocillator
signal, is inserted inthe MX1 mixer; the product of the 1.3MHz mixing going throgh a low-pass filter at 2MHz is applied
to the input of the U1 amplifier and the Q1 transistor that adapt it to the CMOS levels.
The stage that follows is the impulse discriminator (U2) that supplies the demodulated audio signal on TP3; after
passing through the K1 relay that silences it in case of squelch, the audio signal is amplified in amplitude (U3A), filteres
with an 80KHz and a 200KHz low-passes in order to go through a stage that equalize the group delay. The stage with
the U7 and U8 integrated supply the the rectification of the audio signal for thje deviation measurement whilst the U3B
integrate supplies the voltage or the tuning centre.
ADJUSTMENTS:
1. The VR1 variable resistor adjusts the tuning centre; proceed as follows to adjust it correctly:
1.1. Enter the MEASURES>>TUNING INDICATION menu.
1.2. Apply to the RF INPUT connector a signal with a frequncy equal to the reception and amplitude
frequency at -50 dBm. With a spectrum analyzer check that on the IF MONITOR font panel connector ther is
the IF signal with -12dBm amplitude and frequency of 10.7MHz +/- 10 KHz.
1.3. Slowly turn the VR1 variable resistor until the nearest value to 0KHz is red.
2. The VR2 variable resistor adjusts the deviation measurement; proceed as follows to adjust it correctly:
2.1. Enter the MEASURES>>FREQUENCY DEVIATION>>COMPOSITE DEVIATION menu.
2.2. On the RF INPUT apply a signal with a frequency equal to the reception and amplitude frequency
of -50 dBm and modulated +/- 75MHz with a 1KHz note. Check that the set squelch level is comprehended
between -55 dBm and -100 dBm (Men SETUP>>SQUELXCH)
2.3. Adjust the VR3 variable resistor until the display shows a 75.0 KHz value.
NOTA: The CV1 and CV2 capacitive variable resistors and the VR3 an VR4 variable resistors are adjusted in
the factory and must not be touched, since they directly influence the receiver performances.
TEST POINTS:
1. TP1: First IF signal check point; 10.7MHz 50 -90mV RMS
2. TP2: Second IF signal check point; 1.3MHz 9V Peak-Peak
3. TP3: Audio singal check point (for factory adjustment)
4. TP4: 12MHz oscillator check point; 12 MHz 80-150mV RMS
5. TP5: Deviation meaasurement voltage check point; from 0 to 4 Vdc
8. JP1, JP2, JP3: Check points for factory adjustments
Page 22
Page 23
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Page 24
FRONTAL RX Board description
(ELR2408_1 - 2PCB0289_1)
On the FRONTAL RX board are the final stages of the output audio signal, the alarms leds and the power supply
presence leds.
The demodulated and processed audio signal coming from the DEMODULATOR board (ELR6408) enters in the digital
level control at 0.1dB (U-U3) steps and is applied on the U5A, U5B and U4B buffers that supply the MPX signals.
Furthermore the signal - after the level control - enters the U4A buffer going through a 15KHz low-pass filter
(ELR4409_0 board) and a deemphasis stage (0-50-75nS). This buffer send a MONO signal to the output.
The LD5, LD6 , LD7 and LD8 leds indicate the presence of power supply voltages to the equipment (EXT. DC,
+12, -12V and +5V).
The LD1, LD2 , LD3 and LD4 leds indicates the respective alarm if alighted.
On JF4 and JF5 conectors on the FRONTAL RX board an optional board can be inserted, that is the ELTR3408: 19KHz
MPX-Subcarrier deviation measure and alarm.
ADJUSTMENTS:
1. The VR2 variable resistor regulates the final stage of the MPX and MONO output signal final level.
2. With the S1 dip-switch, inserting the squelch can be forced in case of Subarrier and noise alarms
(See the legenda on the electrical schematics).
3. With the S2 dip-switch, the deemphasis can be adjusted or excluded, according to the legenda on the
electrical schematics.
TEST POINTS:
1. TP1: Audio signal check point
2. P1: Insert the bordge if the ELR4409_0 board is not installed.
3. Disinsert the bridge if the board is installed.
Page 25
Page 26
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Page 27
LP15KHz Board description
(ELTR4409_0 - 2PCB0281_0)
The ELTR4409 board contains an elliptical-low-pass-active filter with cutoff frequency of 15KHz that limits the MONO
signal band.
The board is standard supplied with the unit.
ELR RECEIVER SERIES:
On the FRONTAL RX board (ELR2408), take off the P1 bridge and insert JD2 and JD1 in the correspondent connectors.
If the PLUG-IN ELTR4409 board is uninstalled, re-connect the P1 bridge.
Board Functionning Description:
The board is supplied with +12V and -12V throught pin 10 and 4 of JD3 connector.
The input signal applied on pin 1 of JD3 is buffered by U1C to be sent to the alliptical active filter FDNR (Frequency
Dependent Negative Resistance) and then to the U2D amplifier. Thi amplifier compensate the loss of the filter and total
gain response at 0 dB. The output filtered signal is on pin 7 of JD3.
The frequency response stays between 0,5dB from 30Hz to 15 KHz whilst the attenuation at 19KHz is more than
45dB.
Frequency response of the ELTR4409_0 board
Page 28
Page 29
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Page 30
IF AMPLIFIER ELR100 Board desription
(ELR5400_0 - 2PCB0290_0)
The ELR 5400_0 board is installed on the ELR model receivers.
On this board are the first conversion stages of frequency, filtering and IF amplifier.
If the RF signal coming from the front-end on the JC4 connector and the local oscillator on the JC6 connector are
mixed by MX1; the product of this mixing is applied on the amplifying chain and filtering made of U4,CF1, U5 and
CF2. At itsw output there is a 10,7 MHz signal.
Once filtered and amplified, the 10,7 MHz signal enter into the U1 limiter. Its output is filtered again and applied at the
U2 input whose functions are as IF final amplifier, supplying the IF output for the demodulator on the JC8 connector,
and the IF MONITOR output on the JC7 connector.
ADJUSTMENTS:
1. The VR1 and VR2 variable resistors adjust the correct reading of the reception signal displayed on the
MEASURES>>RX SIGNAL menu.
Proceed as follows for a correct adjustment:
1.1. Enter the MEASURES>>RX SIGNAL menu. On the RF INPUT connector apply a signal with
frequency equal to the one of -99dBm amplitude and reception. Adjust the VR1 until a value of
-99dBm is displayed.
1.2. On the RF NPUT connector a signal with a frequency equal to the one of -50dBm amplitude
and reception.Adjust the VR3 variable resistor until a value of -50dBm is displayed.
1.3. Repeat point 1 and 2 many times if necessary.
1.4. Vary the amplitude of the -50dBm input signal to -100dBm and check that the measure error
is within +/- 2dB.
2. The VR2 variable resistor adjusts the singnal amplitude on the IF OUT connector; this amplitude must be
0dBm on 50 ohm impedance.
NOTE: The VR4, VR5,VR6 variable resistors and L2, L3,L4,L5, L11, L12 and L13 coils are adjusted in the
factory and must not be touched, as they directly influence the receivers performances.

TEST POINTS:
The TP1 and TP2 test points and P1 and P2 jumpers are used during the final test in the factory.
Page 31
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Page 33
IF AMPLIFIER ELR200 Board description
(ELR5401_1 - 2PCB0290_1)
On this board are the first two frequency conversions (70MHz and 10,7MHz), the 70MHz pre-filtering chain, 10,7 MHz
filtering chain and the limiter with the reception signal measurement.
The RF signal coming from the front-end, on the JC4 connector, is amplified by U6 to go through voltage pin diode
attenuator;when the input signal overpasses the -35 dBm value, the U10 comparator start a loop which keeps constant
the M1 Mixer input level, by checking the voltage check on pin diode attenuator. This prevents the its intermodulation. This
consent the functionning and maintenings of the characteristics of the equipment even with very strong antenna signals.
This signal so treated enters the M1 Mixer that makes a mix with the local oscillator signallocated on JC6; the 70 MHZ
result is then filteres, amplified and applied to the M2 Mixer input.
The 59,3 MHz quartzed local oscillator is applied on the other mixer input in order to produce a 10,7MHz signal that is
low-pass filtered and amplified by U8. Its output enters in the 10,7MHz filtering chain.
This filtering chain is formed by 3 delayed ceramic filters of controlled group with bandwidth of +/- 250KHz @ -1dB
and two amplifiers that compensate the loss; the result is an excellent selectivity on the adiacent channeland an optimum
linearity in phase to keep an optimum stereo separation.
The first stag of this filtering chain fomrmed by FCX1 and UCX1 can be excluded or included by moving the weldings of
the J4 and J3 bridges. Consequently the total selectivityis increased or reduced according to necessities.
The FC ceramic filter output (last of the chain) is applied to the U11 input that operates as amplitude limiter
and as logaritmic RSSI (received signal measurement) with an 80dB dynamic. The RSSI on U11 pin 6 and 7 is
thermocompensated and normalized by U12 and U13 and then sent to JP4 pin 10 for display.
The 10,7MHz filtered and limited signal on U11 pin 11 goes through a further filter with a band of +/- 1MHz band to
join the buffers/amplifier U3 and U1. The U3 output is filtered to reduce the harmonics. Its then sent to the IF OUT JC8
connector, whilst the U1 output is sent to the JC7 IF MONITOR.
ADJUSTMENTS:
On this board are a lot of adjustments that directly influence the global performances of the equipment; therefore it is
recommended to make only the adjustments for those whose procedure is indicated. The other point of adjustment not
described are made in the factory and must not be modified.
1. Adjustment of the received signal:
Proceed a follows for a correct adjustment:
1.1. Enter the MEASURES>>RX SIGNAL menu. On the RF INPUT connector apply a signal with frequency
equal to the one received and amplitude of -99dBm and adjust the VR4 variable resistor until the
display shows a -99dBm value.
1.2. On the RF INPUT connector apply a signal with frequency equal to the one received and amplitude of
-40dBm and adjust the VR5 variable resistor until the display shows a -40dBm value.
1.3. Repeat the points 1 and 2 many times if necessary.
1.4. Vary the input signal amplitude from -50dBm to -100dBm and check that the masure error stays
within +/- 2dB.
2. Adjustment of the distortion and separation according to the IF filters insertd:
The IF filtering is normally supplied (FCX 3rd ceramic filter exclueded)in order to guarantee the best stereo separation
and distortion performances.
In case of very strong adiacent signal, a third ceramic filter can be inserted by moving the weldings on J4 and J3
jumpers. The selectivity will be better to the prejudice of the frequency separation and distortion.
Page 34
TEST POINTS:
1. The TS1, TS2 TS3 and TS4 check point are used during tha adjustment in the factory.
2. TP1: 59,3MHz local oscillator check point (200-500mV RMS)
3. TP2 : 10,7MHz signal check point before the ceramic filters.
4. TP3 : Pin diode attenuator control voltage check point (o-11V)
5. TP4 : Received signal measure voltage check point (0-4V)
Page 35
Page 36
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Page 37
Page 38
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Page 39
ELR100 FRONT-END Description (RX FILTER 100 & LNA RX 100 Board )
(ELR 9400 \ ELR7408_0 - 2PCB0291_0)
The FRONT-END of the receiver is made of an alluminium double input filter Combline and a low-noise preamplifier.
The signal coming from the antenna is applied to the inut of the first three-cell filter that makes a pre-filter in order to
be applied to the low-noise preamplifier input (ELR7408). After being amplified, the signal goes through the the second
three-cell filter which improves the signal and assures a high rejection of the frequency image.
The front-end total gain is around 20dB and the rejection of the image frequency at 21,4MHz from the central
band is better than 75 dB.
The entire front-end can be tuned without opening from 500 MHz to 1100 MHz and its bandwidth can be adjusted
from around 2MHz @-1dB up to around 6MHz @-1dB according to the frequency.
ADJUSTMENTS:
1. Connect the TRAKING GENERATOR output of a level analyzer of -40dBm to the receiver RF INPUT.
2. Connect the front-end output (JC4 connector)to the spectrum analyzer input and set a frequency centre equal
to the frequency centre on which the filter has to be adjusted.
3. Set a FREQUENCY SPAN on the spectrum analyzer, so to display the current filter curve.
4. Adjust the C2,C3,C4,C7,C8 and C9 variable capacitors to tune the filter on the desired frequency; seen the
high filter selctivity it is necessary to proceed with light movements not to lose the curve visibilty.
5. Adjsut the SPAN and the vertical scale division of the spectrum analyzer for a detailled visualization of
the curve.
6. Regulates the C1, C5, C6, C10 variable capacitor to obtain the maximum simmetry and maximum gain
of the curve.
7. Adjust the P1, P2, P3 and P4 pistons pushing them towards the inside or pulling them towards the outside in
order to obtain the desired bandwidth.
8. Repeat the points 4, 6 and 7 many times if necessary.
Page 40
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Page 41
Page 42
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Page 43
ELR200 FRONT-END (RX FILTER 200 & LNA RX 200 Board)
(ELR A401 \ ELR8401_0 - 2PCB0341_0)
The FRONT-END of the receiver is made of an alluminium double input filter Combline and a low-noise preamplifier.
The signal coming from the antenna is applied to the inut of the first three-cell filter that makes a pre-filter in order to
be applied to the low-noise preamplifier input (ELR8401). After being amplified, the signal goes through the the second
three-cell filter which improves the signal and assures a high rejection of the frequency image.
The front-end total gain is around 22dB and the rejection of the image frequency at 140MHz from the central band
is better than 75 dB.
The entire front-end can be tuned without opening from 1500 MHz to 2500 MHz and its bandwidth can be adjusted
from around 4MHz @-1dB up to around 20MHz @-1dB according to the frequency.
ADJUSTMENTS:
1. Connect the TRAKING GENERATOR output of a level analyzer of -40dBm to the receiver RF INPUT.
2. Connect the front-end output (JC4 connector)to the spectrum analyzer input and set a frequency centre equal
to the frequency centre on which the filter has to be adjusted.
3. Set a FREQUENCY SPAN on the spectrum analyzer, so to display the current filter curve.
4. Adjust the C1, C2,C3,C4,C7and C8 variable capacitors to tune the filter on the desired frequency; seen the
high filter selctivity it is necessary to proceed with light movements not to lose the curve visibilty.
5. Adjsut the SPAN and the vertical scale division of the spectrum analyzer for a detailled visualization of
the curve.
6. Adjust the pistons pushing them towards the inside or pulling them towards the outside in order
to obtain the desired bandwidth.
7. Repeat the points 4 and 6 many times if necessary.

Page 44
ll pistone deve scorrere fino
alle linee tratteggiate quindi la
linguetta interna deve essere
flessibile.
Bloccare con grani M2,5
PARTICOLARI DI MONTAGGIO DEL FILTRO RX 200.
Viti M3X25 con dado e rondella
spaccata di bloccaggio
Particolare linguette
interne in ottone da 0,2mm
All'interno dello
scatolino centrale va
montata la scheda
LNA RX 200
(ELR8401) dove
vanno saldati i due fili
argentati da 0,8mm
Nel foro M6 montare il condensatore
passante e saldarci il cavo
ELRSAL009 (cavetto rosso con la
banana 3mm)
VISTA TOTALE
Page 45
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Page 46
PLL RX 200 Board description
(ELR4401_0 - 2PCB0339_0)
The PLL RX 200 Board containsthe PLL and its connected circuits. On the PCB is the aluminium box containing the
various VCOs whose frequency is controlled by the PLL.
The VCO munted on the PLL RX 200 board varies according to the equipment:
1. ELR 200B Frequency 2300-2500MHz :VCO 2500 (ELTR1400_0 - 2PCB0335_0)
2. ELR 200A Frequency 1500-1800 MHz :VCO 1600 (ELTR2401_0 - 2PCB0336_0) Other VCOs on different
frequencies can be mounted on the PLL RX 200.
The integrated circuit U1 comprehends the frequancy synthesizer that is controlled by the CPU. The auxiliary VCO
output is brought on the board, through the JC2 connector; this frequency is divided by the dividers programmable
inside the PLL and locked in phase to the reference frequency obtianed dividing the TCXO by 10MHz U2. The
phase comaprator output of U1 (pin 2) enters the ring filter that produces the continuous voltage needed to bring
the VCO in frequency.
The ring filter is of the double bandwith kind, controlled by software; in phase of lock of through the pin 1 of U1, it
ischanged over on the maximum bandwidth in order to have a quick locking. As the PLL islocked, the filter is changed
over the mimimum bandwidth for good. This method assures a phase noise reduction caused by the PLL, and in the
modulator a flat response on the low modulating frequency down to 4 Hz.
The DL1 led indicates the PLL locking stage, whilst U6 buffers the VCO control voltage to send it to the CPU
which will dispaly it.
ADJUSTMENTS:
1. The synthesizer has only one adjustment point made of the VR variable resistor, which regulates the readings of
the VCO control voltage value on the SETUP>>FREQUENCY menu.
Variable resistors adjustment:
1.1. Enter the SETUP>>FREQUENCY menu
1.2. Connect trhe voltmeter on TP1 test point
1.3. Set a frequency until 10,0V is red on the voltmeter.
1.4. Adjust the VR1 variable resistor until an indication of 10V appears on the VCO Voltage bar.
1.5. Set a frequency 10MHz higher and check that the writing OUT OF RANGE alights.
1.6. Reset the desired frequency inside the VCO range.
TEST POINTS:
1. On the TP1 test point the VCO (Vcv) control voltage can be measured between 0,5V and 10V.
2. On the TP2 test point is the Vcv valu measurement voltage between 0 and 4V.
Page 47
Page 48
55
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Page 49
A
B
C
D
VCO 2500 Board Description
(ELTR1400_0 - 2PCB0335_0)
The VCO board is mounted inside the ELT-200B transmittersa and ELR-200B receivers.
This board is made of two PCBs inside a small alluminium box to assure its shielding. In all transmitters, inside this box
is also the power control circuit (PWR CONTROL TX). All alluminium boxes are fixed to the PCB underneath them with
antivibration rubber rings to reduce the VCO microphone effect.
The first PCB of the VCO 2500 (A part) contains the voltage controlled oscillator that oscillating at a frequency that is
half the output frequncy, the frequency duplicator and a high-pass filter. On the second part of the PCB (B part) is an
Hairpin band-pass filter, realized on special material for low-losses microwaves.
The oscillator circuit is made of the Q4 transistor, of a CR1 coaxial resonator, of a varicap DV1 and capacitors realized
in distributed constants technology. It oscillates in 1150-1250MHz frequancy range. The oscillator is followed by
the first amplifier stage U1, and then a D2 diode, a high-pass filter and the U2 amplifier that form the frequancy
duplicator.
At its output is the oscillator second harmonic, its alrady pre-filtered. The Hairpin band-pass filter, with passing band
2250-2550, is inside a totally shielded cavity. Its use is to clean the carrier from the sub-harmonic and harmonic
products. At the input of this filter, the JC2 connector takes a portion of signal and lead it to the PLL. The VCO
output signal is available on JC6 connector. All VCO circuits are supplied by active filters that have to minimize
the power supply line noise.
ADJUSTMENTS:
The VCO is normally supplied on the required frequency and can cover a band of 25-30MHz thereabouts without
need of adjustments. It is possible to move this band inside the 2350-2500 MHZ range without replacing or adding
components. Only in case the VCO is set at the most high frequencies of its range, it could be necessary to replace
the CR1 resonator with one at a lower frequency.
Information for moving the operating band:
1) The pad A and B determine the VCO operating band.
In particular the A pads determine the frequency,
and the B pads determine the frequency excurtion
(range).
2) To decrease frequency it is necessary to de-solder
some of the A pads disconnecting them from the
central CR1 and then soldering or desoldering some
B pads to adjust the frequency excurtion. As the two
parameters are partly independent it is necessary to
repeat the operations more than once to reach the
desired setting. To prevent malfunctions it is better
not to solder B pads farther the indicated outline.
3) On the contrary, to raise in frequency, it is necessary
to solder some of the A pads connecting them to the
CR1 central and act soldering or de-soldering some
of the B pads to adjust the frequency excurtion. As
these two parametrs are partly independent it is
necessary to repeat the operation a few times before
reaching the desired setting. To prevent malfunctions
it is better not to solder B pads farther the indicated
outline.
Page 50
4) During the operation of modify of the operating band, keep in mind that:
a) The C pads are the positive reaction capacitor; if the capacitor is too big ( too many pads to solder
together to the R19 pin) the oscillator phase noise increases, whilst if the capacitor is too small (few pads
soldered together with R19 pin) the reaction could not be enough to strike the oscillation.
b) The D pads determine the combining between the CR1 resonator and the Q4 transistor base; too many
pads soldered to CR1 pin make the oscillator phase noise worse, whilst too less pads soldered to CR1
pin could make the oscillation stop.
c) To make the oscillator raise in frequency, further to the A pads, one can intervene also on the CR1 taking
off by scratch small parts of the external metallization.
Page 51
Page 52
55
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Page 53
B
C
D
AA
VCO 1600 Board Description
(ELTR2401_0 - 2PCB0336_0)
The VCO board is mounted inside the ELT-200A transmittersa and ELR-200A receivers.
This board is made of two PCBs inside a small alluminium box to assure its shielding. In all transmitters, inside this box
is also the power control circuit (PWR CONTROL TX). All alluminium boxes are fixed to the PCB underneath them with
antivibration rubber rings to reduce the VCO microphone effect.
The first PCB of the VCO 1600 (A part) contains the voltage controlled oscillator that oscillating at a frequency that is
half the output frequncy, the frequency duplicator and a high-pass filter. On the second part of the PCB (B part) is an
Hairpin band-pass filter, realized on special material for low-losses microwaves.
The oscillator circuit is made of the Q4 transistor, of a CR1 coaxial resonator, of a varicap DV1 and capacitors
realized in distributed constants technology. It oscillates in 750-900MHz frequancy range. The oscillator is followed
by the first amplifier stage U1, and then a D2 diode, a high-pass filter and the U2 amplifier that form the frequancy
duplicator.
At its output is the oscillator second harmonic, its alrady pre-filtered. The Hairpin band-pass filter, with passing band
1500-1800, is inside a totally shielded cavity. Its use is to clean the carrier from the sub-harmonic and harmonic
products. At the input of this filter, the JC2 connector takes a portion of signal and lead it to the PLL. The VCO
output signal is available on JC6 connector. All VCO circuits are supplied by active filters that have to minimize
the power supply line noise.
ADJUSTMENTS:
The VCO is normally supplied on the required frequency and can cover a band of 25-30MHz thereabouts without
need of adjustments. It is possible to move this band inside the 1500-1800 MHZ range without replacing or adding
components. Only in case the VCO is set at the most high frequencies of its range, it could be necessary to replace
the CR1 resonator with one at a lower frequency.
Information for moving the operating band:
1) The pad A and B determine the VCO operating band.
In particular the A pads determine the frequency,
and the B pads determine the frequency excurtion
(range).
2) To decrease frequency it is necessary to de-solder
some of the A pads disconnecting them from the
central CR1 and then soldering or desoldering some
B pads to adjust the frequency excurtion. As the two
parameters are partly independent it is necessary to
repeat the operations more than once to reach the
desired setting. To prevent malfunctions it is better not
to solder B pads farther the indicated outline.
3) On the contrary, to raise in frequency, it is necessary
to solder some of the A pads connecting them to the
CR1 central and act soldering or de-soldering some
of the B pads to adjust the frequency excurtion. As
these two parametrs are partly independent it is
necessary to repeat the operation a few times before
reaching the desired setting. To prevent malfunctions
it is better not to solder B pads farther the indicated
outline.
Page 54
4) During the operation of modify of the operating band, keep in mind that:
a) The C pads are the positive reaction capacitor; if the capacitor is too big ( too many pads to solder
together to the R19 pin) the oscillator phase noise increases, whilst if the capacitor is too small (few pads
soldered together with R19 pin) the reaction could not be enough to strike the oscillation.
b) The D pads determine the combining between the CR1 resonator and the Q4 transistor base; too many
pads soldered to CR1 pin make the oscillator phase noise worse, whilst too less pads soldered to CR1
pin could make the oscillation stop.
c) To make the oscillator raise in frequency, further to the A pads, one can intervene also on the CR1 taking
off by scratch small parts of the external metallization.
Page 55
Page 56
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Page 58
SINTHESIZER RX 100 Board Description
(ELR3408_1 - 2PCB0296_1)
This board, installed on the ELR100 receivers, contains the VCO (that functions as 1st local oscillator of the receiver),
the frequency synthesizer and the frequency reference (TCXO).
The VCO, inside a metallic box in order to prevent its shielding, uses the Q5 fet as oscillator and the resonant circuit
is made by a DV1 varicap diode, by a C31 capacitor and by a microstrip technology inductance. On JC6 connector is
the local oscillator output with a 7dBm level whilst on JC5B connector is the PLL signal.
The U2 integrated circuit is the frequency synthesizer controlled by the CPU; the pahse comaprator output of U2 (pin 5)
enters into the ring filter producing a continuous voltage necessary to bring the VCO in frequency.
The synthesizer frequency reference is made of the TCXO U1.
ADJUSTMENTS:
2. The VCO is supplied already adjusted on the desired frequancy with a frequency excursion of 40 MHz approx.
In case the operating frequency has to be changed of some tens of MHz, it is enough to move the
microstripline shortcircuit bridge; to raisethe frequency, solder the shortcircuit pads toward C31, whilst to
decrease the frequency, desolder the pads.
3. The synthesizer has only one adjustment point that is the VR1 variable resistor, that regulates the VCO control
voltage value reading on the SETUP>>FREQUENCY menu. The VR1 adjustment is made in the factory
and it is recommended not to change it.
TEST POINTS:
3. On the TP2 test point is the VCO (Vcv) control voltage can be measured between 0,5V and 10,5V.
4. On the TP1 test point is the Vcv value measurement voltage between 0 and 4V.
Page 59
Page 60
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Page 62
19KHz subcarrier alarm/measure (OPTIONAL) Board description
(ELTR3408_0 - 2PCB0293_0)
This board is an exclusive function of Elenos links: the 19KHz MPX-Subcarrier measure and alarm.
The ELTR3408_0 board is a quick-joint Plug-in and can be installed on all versions of transmitters and receivers.
The MPX signal enters the JP4 pin1 and is sent to U1 that is opportunely polarized and formatted so to have a high
Q band-pass filter temperature compensated . This filters ensures that only the 19KHz MPX-subcarrier goes through,
and with a L+Rsignal attenuation better than 70dB.
At the U1 output the 19Khz signal is rectified by U28 and sent to the U2D buffer which makes it available on the F5
pin 2 for the measurement of the subcarrier level.
Furthermore, the rectified signal is sent to the U2A comparator determining the turning on of the alarm if the MPX
subcarrier is missing (through the VR1 variable resistor that regulates the threshold).
in the stereo modulated signals, the 19KHz MPX subcarrier has a fixed level which corresponds to 10% approx. of the
total deviation. By measuring the sybcarrier level once the signal has been demodulated, it is very easy to measure the
frequency deviation andrealize an alarm for the missing modulation that intervences immediately and precisely if the
subcarrier level goes below a prefixed threshold. All these functions are exclusive of Elenos radio links.
ADJUSTMENTS:
1. The VR1 variable resistor regulates the intevenience threshold of the !19KHz MPX SUBCARRIER alarm and the
led alighting on the front panel (funtion available only on receivers)
2. The VR2 variable resistor regulates the deviation of the 19KHz MPX subcarrier frequancy.
NOTICE! : The adjustment of VR1 and VR2 needs the use of specified precision measuring equipment.
For this reason these adjustments are made in the factory during the final test and must not be modified.
If necessary, refer to the ELENOS technical department for more detailles information.
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USE AND MAINTENANCE MANUAL

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