MICOM-3F/3T/3R HF-SSB Owner’s Guide
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Table 5. Accessories Connector Pin Functions (Cont’d)
Pin Designation
Description
20 EXT ALARM
External alarm output (open collector, pulled to ground when external alarm is
activated
21 VPP
Flash programming voltage, input to BDM
22 DSC/KW_ALC
BDM – Data serial clock/kW amplifier ALC
23 SQ GATE
Squelch open/closed indication output
24 DSO/FAN
ON/OFF
BDM – Data serial out/Fan control
25 FREZE/KW TU
BDM – Freeze/kW amplifier tune
26 GND
Ground
27 FWD CLOSE
LOOP
ALC radio loop closure input
28 RXC
Receive input (point-to-point protocol to host/HLC)
29 TXB
RS-232 transmit output to VP-116, PPS, 500W, ASTIC
30 AMP REV
Maintain constant power at 500W transceiver output
31 RXD
Receive input (point-to-point protocol to host/HLC)
32 TX AUDIO OUT
Input to baseband TX path
33 RXB
RS-232 protocol receive input to VP-116, PPS, 500W, ASTIC
34 RX AUDIO OUT Input to baseband RX path
35 RX AUDIO IN
Output from baseband RX path
36 AMP FWD
Maintain constant power at 500W transceiver output
37 VP PTT
PTT output (active low)
38 TXD
Transmit output (point-to-point protocol to host/HLC)
39 TXC
Transmit output (point-to-point protocol to host/HLC)
40 TX AUDIO IN
Output from baseband TX path
41 EXT
RX
AUDIO(2)+
Audio out from the optional ISB processor
42 EXT TX AUDIO(2)- Audio input to the optional ISB processor
43 EXT RX DATA-
Baseband output (0 dBm, 600
Ω
)
44 EXT RX DATA+
Baseband output (0 dBm, 600
Ω
)
