1 - TX (-)

2 - AFSK Key (0V=Keyed)

3 - RX (+)

4 - unused

5 - unused

6 - TX (+)

7 - RX (-)

8 - Ground

9 - Not Used

1 - PTT (0V=Keyed)

2 - RX Audio 0dbm @600 ohm

3 - RX Audio 0dbm @600 ohm

4 - TX Audio 0dbm @600 ohm

5 - TX Audio 0dbm @600 ohm

6 - Ground

7 - unused

8 - unused

9 - unused

Pins 2 and 3, 4 and 5 are 600 Ohm Balanced lines and are isolated through transformers.

RX Audio is fixed at +12 dbm.

TX Audio is adjusted by r-29 on the exciter board.

A - Coupler Ground

B - Coupler Key (0V=Keyed)

C - Coupler Fault (0V=Fault)

D - Coupler ID (0V=Coupler Connected)

E - Tune Pulse (0V=Initate Tune Cycle)

F - Tune Power Request (0V=Request)

G - Bypass (0V=Bypass)

H - +13.6 Volts

I - + 13.6 Volts

J - Key Disable (0V=disable)

K - LPA ID (0V=LPA connected)

L - 115 VAC Line

M - 115 VAC Neutral

N - Overtemp Fault (0V=Fault)

A - +12/28 VDC

B - 115/230 VAC Line

C - unused

D - +12/28 VDC Ground

E - 115/230 VAC Neutral

F - Ground

1 - +13.6 VDC

2 - FAN CONT + ON (signal is active low)

3 - Ground