Furuno FCV-1200L Service Manual page 9

Figure 2.2 Signal flow diagram; Black Box & Monitor Type
Details of each signal shown in figures 2.1 and 2.2
Note; H: high frequency L: low frequency
Name
VTX H/L
KP TX H/L
TRX SIG H/L
TRX TVG H/L
LOCAL 1 H/L
LOCAL 2 H/L
VTX CONT H/L Controls VTX H/L voltage
PD H/L
TRX ST 1
TRX ST 2
EXIF ST
ETR SIG
ES SIG
EKPI H/L
KPO H/L
EXTXD/RXD
Function
Supply voltage for TX power amplifier (+B voltage)
Pulsed carrier signals for transmission
Echo signals (output from ES board)
TVG and Gain control voltage for receiver amplifiers
First local carrier signals
Second local carrier signals
Reduces transmission power
Status signal of frequency; 15 - 200 kHz or 400 kHz.
Status signal of the ES board connection
Status signal of the EXIF unit connection
Echo signal output (8 bit binary code) from EXIF unit to MAIN board
Echo signal from internal transceiver unit to EXIF unit
Trigger signal inputted from external transceiver unit
Trigger output for external transceiver unit
CPU data communication line between EXIF 1 and MAIN board
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