Micom 3f - Page 140

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)