Antenna Unit - Furuno FAR-2107 Series Service Manual

7.2 Antenna Unit

7.2.1 RFC board (03P9346A)
The RFC board is used commonly for X-band and S-band radars. The version of the
RFC board can be checked in the "FACTORY TEST". See page.6-19 for details.
1. Control signals
The RFC board and the SPU board of the Processor unit communicate with each other
through RS-422/115.2 kbps by the asynchronous communication method. The overview
of control signals is shown below.
Serial data sent from the SPU board to the RFC board includes GAIN, STC and TUNE
control signals. These signals are processed on the RFC board to control the MD board,
IF board, PWR (RF) board and MIC circuit of the TR unit. The RFC board converts
head line signals, bearing signals, TUNE IND voltage, Magnetron current, DI-Monitor
voltage, and each supply voltage monitored on the TR unit circuit into serial data and
send them to the SPU board.
GAIN
STC
FTC
VRM/EBL
Track Ball
Key SW
CONT.
Power SW
unit
Monitor
Video Sig.
unit
TR/SCANNER unit
Processor unit
(RPU-013)
PULTH WIDTH
GAIN
STC
TX Trigger
TUNU
MBS
PM Lelvel/Enable
RF Tx data
SPU
HD / BP
TUNE IND
(03P9337)
Mag.-Current
DI-Monitor
RF Rx data
IF- Video SIg. MIX
PWR
+24V
(AC/DC)
Fig. 7.2.1 Overview of Control Signals
IF
(03P9335)
B.W
GAIN/STC
IF-Video Sig.
MBS
TUNE IND
TUNU
DI Monitor
TUNE GATE
FET ATT
PIN ATT
TRIG
TRIG
TRIG
TRIG
RFC
HEATER
(03P9346A)
Short pulse
TX-HV PROTECT
MUG. Current
V TRIG
-12V
+5V
+12V
+32V
HEATER
PWR(RF)
(03P9348)
7-5
7.2 Antenna Unit
TUNNING
PIN ATT
MIC
IF(60MHz)
DI Monitor
Mag.
PULSE
Transformer
MD
(03P9244)
HD
BP GEN
BP
(03P9347)