Furuno FCV-1200L, Service Manual

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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 Function
VTX H/L
Supply voltage for TX power amplifier (+B voltage)
KP TX H/L Pulsed carrier signals for transmission
TRX SIG H/L Echo signals (output from ES board)
TRX TVG H/L TVG and Gain control voltage for receiver amplifiers
LOCAL 1 H/L First local carrier signals
LOCAL 2 H/L Second local carrier signals
VTX CONT H/L Controls VTX H/L voltage
PD H/L
Reduces transmission power
TRX ST 1 Status signal of frequency; 15 - 200 kHz or 400 kHz.
TRX ST 2 Status signal of the ES board connection
EXIF ST Status signal of the EXIF unit connection
ETR SIG Echo signal output (8 bit binary code) from EXIF unit to MAIN board
ES SIG Echo signal from internal transceiver unit to EXIF unit
EKPI H/L Trigger signal inputted from external transceiver unit
KPO H/L Trigger output for external transceiver unit
EXTXD/RXD CPU data communication line between EXIF 1 and MAIN board