2. +12V DC on Transmit (right position)
The top position is for „normaly open“ configuration.
The bottom position is for „normaly closed“ configuration (shorted
on RX).
(3) FS (Foot Switch) –black RCA connector
This RCA jack is a manual PTT input from a footswitch. This input always is
looking for a closure to ground on transmit.
Foot switch line is isolated with opto-coupler
(4) PTT In (Generic) ) – black RCA connector
This RCA jack accepts "PTT" input from any external device
such as a foot switch a relay or a line containing +5V or
+12V DC from a USB keying device or a PC interface.
PTT IN line is isolated with opto-coupler
BLACK!!
(5) Inhibit (Output) – red RCA connector
For blocking transmit capability of other transmitters if the
Inhibit Mode has been activated use this output RCA jack.
It's either +12V or GND. Jumpers to program this are
located below it's RCA connector socket.
(6) SWR Alarm– red RCA connector
This input RCA jack can accept a "High SWR" alarm (or any
other alarm state) from some external device (such as an
anatenna analyzer amplifier etc.) to block the transmitter
from putitng out any power. This input is expecting either
+5V DC or a closure to ground (programmable via a jumper
located below it's RCA connector socket).