If Board (03P9335) - Furuno FAR-2107 Series Service Manual

7.2.3 IF board (03P9335)

The IF board has different parts in X-band and S-band radars and is not compatibly used
for different types of radars.
IF board for X-band radar
The IF board is comprised of a video detection circuit and the semi-log amplifier circuit
of IF signals (60 MHz). IF signals of 60 MHz and video signals are superimposed and
outputted from the IF board to the Processor unit. Video signals are outputted to allow
connection to an existing type of a sub monitor.
RFC (03P9346A)
TX data
RX data
U17
(FPGA)
Data D0-7
Data D0-7
TUNE SYNC
TUNE SCLK
TUNE DIN
U19
(CPU)
TUNE AD
D MONI AD
MIX Sig.
IF SIG.(60MHz)
and
Video SIG.
03P9335A
PIN ATT CONT
U10 FET ATT
TUNE GATE
SAMPL HOLD
MSB ENABLE
TEST SIG ENABL
U16
(D/A)
U7
(A/D)
2.5V
U12, 1
U13
(D/A)
U11
Fig. 7.2.8 Connection of RFC board IF board
03P9335B
IF board for S-band radar
TEST SIG
STC-CONT
STC DETECT
+12V / +5V / -12V
IF
(03P9335)
TUNE
SDATA/CLK/DATAE
VBW A/B
TUNE GAIN
TUNE IDN
D MONI
7-13
7.2 Antenna Unit
TUNNING
PIN ATT*
X/S band Echo
+5V*
MIC
DI-MONITOR
IF(60MHz)
X band* S band*
PIN ATT none
+5V +9V