7.2 Antenna Unit
7-5
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.
Fig. 7.2.1 Overview of Control Signals
CONT.
unit
PWR
(AC/DC)
SPU
(03P9337)
Mag.
PULTH WIDTH
GAIN
STC
TX Trigger
TUNU
MBS
PM Lelvel/Enable
IF
(03P9335)
RFC
(03P9346A)
TX-HV PROTECT
TRIG
TRIG
TRIG
TRIG
HEATER
Short pulse
MD
(03P9244)
BP GEN
(03P9347)
BP
HD
MUG. Current
V TRIG
PWR(RF)
(03P9348)
-12V
+5V
+12V
+32V
HEATER
B.W
GAIN/STC
MBS
TUNU
TUNE GATE
FET ATT
PIN ATT
MIC
TUNNING
PIN ATT
IF(60MHz)
DI Monitor
PULSE
Transformer
Monitor
unit
GAIN
STC
FTC
VRM/EBL
Track Ball
Key SW
Power SW
Video Sig.
HD / BP
TUNE IND
Mag.-Current
DI-Monitor
IF- Video SIg. MIX
IF-Video Sig.
TUNE IND
DI Monitor
RF Tx data
RF Rx data
+24V
Processor unit
(RPU-013)
TR/SCANNER unit
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