Furuno FAR-2107 Series Service Manual page 440

2. IF-VIDEO MIX signal input
IF-VIDEO MIX signals in which video signals and 60 MHz IF signals from the TR unit
are superimposed and separated at HPF (30 MHz)/LPF (30 MHz), and outputted as
external monitor signals of Slave-Display-1 and Slave Display-2.
Slave-Display-1 is set as Full-Log signal and Slave Display-2 as Semi-Log signal but
the jumper setting of JP3 to JP6 can change the setting. Video signals are converted into
A/D (8bit) at U46 in the next stage and inputted to the U46, SPU FPGA.
RFC p.c.b
RF unit
IF AMP p.c.b
Log AMP
(Video sig.)
IF input
IF AMP
(60MHz)
IF AMP
(Liner: 60MHz)
GAIN/STC CONT
Fig. 7.3.7 Input of IF-VIDEO MIX signal to the SPU board
The level of video signal from external radar can be adjusted by R401 so that the video
signal level of TP58 becomes 2.0 Vp-p.
See page.4-74 to 4-82 for information on connection of video signals to and from
external devices.
RPU-013
SPU p.c.b
RF Tx/Rx
LPF
(L/C)
IF + Video MIX
MIX
HPF
(L/C)
U87
7-35
AD/DATA
ARPA/MAIN CPU
8bit
SEL A/D
SEL VIDEO
(U83) (U76)
TEST ECHO
TP58
OP VIDEO IN
JP6
JP5
JP4
JP3
Short Puls FIL
(BW: 35MHz)
MIdle Puls FIL
(BW: 10MHz)
DET
Long Puls FIL
(U86)
(BW: 2.5MHz)
U85
BW A/B sel
7.3 Processor Unit (RPU-013)
OP HD OUT-1
HD
OP HD OUT-2
OP BP OUT-1
BP
J617, J618
OP BP OUT-2
SUB Display-1, 2
OP TRIG OUT-1
TRIG
OP TRIG OUT-2
HD IN
BP IN
TRIG IN
J616
Master Radar
R401
U85
OP VIDEO IN
OP VIDEO OUT-1 (FULL LOG)
J617, J618
U78
OP VIDEO OUT-2 (SEMI LOG)
SUB Display-1, 2
U78