Parts List/Tune Up Info

MARINE RADAR
RA775UA
 Technical description that is not described on FCC Form 731 and an
attached instruction book for Type RA775UA.

1. Function of each electron tube, semiconductor or other active circuit

device Rule's No.2.983 (d) - (6)

1.1 Electron tubes

Symbol No. Description Type Function

V1 Magnetron M1489 Transmitting tube

1.2 Semiconductor in the chassis of the scanner unit

Symbol No. Description Type Function

U2 Limiter diode NJS6931 Receiver protector at X-band

U3 Front end with X-band NJT1959 RF amplifier, local oscillator and mixer
amplifier

1.3 Semiconductoron SCAN PCB

Symbol No. Description Type Function

D1 IC 74LS00F Quadruple 2 input AND

D2 IC AC235AFP Scanner controller

N1 IC 78L18F Voltage regulator

N2 IC 7805FM Voltage regulator

N3 IC TC35095AF 8ch A/D converter

N4 IC uPC451G2 Dual Op-amp

N5 IC uPC803G2 Dual Op-amp

N6 IC uPD74HC4066 Analog switch

G

N7 IC AA231AFP Logarithmic amplifier

V1,V3 Transistor 2SC3735 Pulse amplifier

V2 Transistor 2SC1462 Pulse amplifier

V4 Transistor 2SC2712 Switching high voltage

2
V5 Transistor 2SA1154 Switching high voltage

Symbol No. Description Type Function

V6 FET 2SJ132-Z FET for the switching high voltage

V7 FET 2SK738-Z-E1 FET for the switching high voltage

V8 FET 2SK1450 Switching high voltage

V9 Diode FMU-16S Damping diode

V10,V12 Zener diode RD5.1MB Rectifier for magnetron current

V11 Zener diode RD6.2MB Rectifier for magnetron current

V13 Diode 1SS184 Rectifier for magnetron current

V15 Zener diode RD6.2MB Hold off diode

V16 Transistor 2SA1182 Amplifier

V19 Diode 1SS184 Switching of Tuning

V20 Zener diode RD3.3MB Limiter

V21 Transistor 2SD1005 Output buffer for video

V22 Transistor 2SA1213 Amplifier

V23 Transistor 2SC3735 Buffer amplifier

V24 Diode 1SS123 Output buffer for video

V26 Diode 1SV222 Temperature compensator

V28 Transistor 2SC3356 Pre-amplifier

V30 IC uPA2003GR Septuple transistor array

V31 IC uPA2003C Septuple transistor array

V32 Zener diode RD4.7MB Limiter of trigger

V33 Diode 1SS123 Temperature compensator

V34 Diode 1SS184 Switching of band width

V35,V36 Zener diode RD5.1MB Limiter

3
1.4 Semiconductor in the chassis of the display unit

Symbol No. Description Type Function

H1 LCD module LM64P302 LCD display

U1 Encoder RECW20D-50- Encoder

201-1D

1.5 Semiconductor of MAIN PCB

Symbol No. Description Type Function

D1-D2,D24,D26 IC 74HC541F Octal 3-state buffer

D3 IC AC233CFP Graphic memory controller

D4 IC uPD72020GC- Graphic controller

8-3B6

D5-D8,D13-D14 IC VRAM2M70J 256kX8 VRAM

D9-D12 IC 74HC166F 8-bit shift register

D15 IC SRAM32KX8- 32kX8 SRAM

12CF

D16 IC HD6413003TF1 16bit CPU

6

D17-D18 IC 74HC138F Decoder

D19,D28 IC 74HC273F Octal D-flip-flop

D20 IC EPROM256kX1 256kX16 EPROM

6-12C

D21 IC 24LC04B/SN 512kX8FRAM

D22 IC 74HC74F Dual D-flip-flop

D23,D39 IC 74HC14F Schmitt-trigger inverter

D25,D33 IC 74HC245F Octal bus transceivers

D27 IC 74HC05F Hex. Inverter

D29-D30 IC 74HC595F 8-bit shift register

D31 IC MB89251A-PF Serial data transmitter/Receiver

D32 IC 74HC123F Dual Multivibrators

D34 IC TC35095AF 8ch A/D converter

4
Symbol No. Description Type Function
D35 IC AC232CFP Video signal processor

D36 IC HM62832HJP- 32kX8 SRAM

25

D37 IC MC14046BF Phase locked loop

D38 IC uPD485505G- Line buffer

25

D40 IC 74HC74F Dual D-flip-flop

K1-2,4-6 Photo coupler TLP181BL Isolator

K3 Photo coupler PC356T Isolator

N1 IC TL7759CPS Voltage detector

N2-5 IC THS124 Hole IC

N6,N9 IC uPC451G2 Quadruple Op-amp

N7 IC 78L05F Voltage regulator

N8 IC MB88346BPF 12ch 8bit D/A converter

N10 IC AA239BFP Video controller

V1 FET 2SK1419 Switch

V2 Thyristor 03P2J Over current protector

V3 Zener diode RD10MB2 Voltage regulator

V4 Diode DF10LC20U Voltage protector

V5,V36 Transistor UN211F Buffer amplifier

V6-V7,V39- Diode 1SS123 Switching diode

V40,V43

V8,V10- Diode 1SS184 Switching diode

V11,V17-
V18,V25

V9,V34 Transistor uPA2003GR Transistor array

V12 Zener diode RD5.1MB2 Voltage regulator

V13,V19,V22,V2 Transistor UN221L Buffer amplifier

6,V38,V42

V14 Transistor 2SA1213 CFL amplifier

V15-V16 Transistor 2SD1000 CFL amplifier

5
V20-V21 Transistor 2SC2712 Buffer amplifier

Symbol No. Description Type Function

V23,V27-V33 LED TLG260 Illuminator

V24 Transistor 2SA1213 Buffer amplifier

V35 Transistor 2SD1000 Trigger amplifier

V37 Transistor 2SB799 Output buffer for video

V41 FET 2SK2158 Switch

1.6 Semiconductor of POWER PCB

Symbol No. Description Type Function

D1 IC TC4011BF(N) Quadruple 2 input NAND

K1 Photo coupler TLP181BL Isolator

K2 Photo coupler PC356T Isolator

N1-2 IC uPC494G Switching controller

N3 IC uPC1093T Voltage regulator

V1 Transistor 2SC2873 Voltage regulator

V2,V19-V20, Transistor 2SC2712 Buffer amplifier

V3,V8 Diode DE5SC6M- Rectifier

4061

V4-V5 Diode D1FL20U-4063 Rectifier

V6-V7 Diode RU4A Rectifier

V9,V11 Zener diode RD20MB2 Voltage protector

V10 Zener diode RD10MB2 Voltage regulator

V12,V14,V17,V2 Transistor 2SA1213 Buffer amplifier

2

V13,V15,V18,V2 Diode D1FS4-4063 Switching diode

6

V16,V25,V28 FET 2SK1419 Switch

V21 Transistor 2SC2873 Buffer amplifier

V23-V24 FET 2SK2010 Switch

6
V27 Transistor 2SA1162 Switch

V29 Transistor 2SB1097 Voltage regulator

Symbol No. Description Type Function

V30-V31 Transistor 2SC2712 Voltage regulator

V32,V42 Zener diode RD5.1MB2 Voltage regulator

V33 Transistor UN221L Buffer amplifier

V34-V36 Diode DF10LC20U- Voltage protector

4062

V37 Transistor 2SC3631-Z Switch of H.T.

V38 Transistor UN2113 Buffer amplifier

V39 Diode A1SS123 Switching diode

V40 Transistor 2SA1413-Z Switch of H.T.

V41 Transistor 2SA1213 Switch of H.T.

7
2. Tune up procedure over the power range or at specific operating power levels. Rule's No. 2.983(d)-(9)

2.1 Transmitter
Pulse radars employ a pulse-excited magnetron as the transmitter tube.
The magnetron used in this radar has a fixed cavity resonator which determines the oscillating
frequency. Accordingly, this radar transmitter has no more frequency-adjust circuitry.

2.2 Receiver
Pulse radars receive the reflected signal from targets, therefor receiving signal has the same frequency
as the transmitter power output. Thus, the radar receiver is tuned to the transmitting frequency. This
radar has a super heterodyne type receiver with a Front-End module. The Front-End module consists
of a GaAs FET low noise amplifier, a double balanced mixer and a FET local oscillator. Tuning of the
receiver is accomplished by controlling the local oscillator frequency. The local oscillator consists of a
FET and a varactor diode. It's oscillating frequency is controlled by the voltage across the varactor
diode. Tuning is made by an automatic tuning circuit controlling the voltage, so that the signal
frequency from the mixer coincide with intermediate frequency of the receiver.