
User's Manual | ACOM 2S1 | Automatic XCVR Commutator
June 2022
S e c t i o n INSTALLATION | Page 17 of 32
Table 2-2 | Signals and pin out of the CONTROL A/B connector
CONTROL A/B
connectors
Pin Nr.
Pin name
Description
Specification
MIC-type connector,
4-pin, male
(Rear panel.
front view)
1
+13 VDC
Power supply
+(11-14) VDC
2
TX GND
Ground on transmit
-
3
GND, Shield
Ground
-
4
TXINHIBIT
Disables transmission
-
Housing
-
Cable shield
Ground
Table 2-2 | Signals and pin out of the CONTROL A/B connector
1)
Connect commutator's connector
CONTROL
, Pin 1 (+13V) to any DC supply voltage in the
range +(11-14) V available from the transceiver;
2)
Connect commutator's connector
CONTROL
, Pin 2 (TX GND) to the transceiver's output
providing "ground on transmit" (it's usually dedicated for external amplifier T/R control).
Prefer an electronic output to a relay contact.
Transceiver producers give different names to this signal, for instance: TX-GND, SEND,
T/R-LINE, etc. Some transceivers require that "ground on transmit" is implemented via a
software command, or by changing the setting of a switch on the rear panel, or interior
of the transceiver.
Check your transceiver's manual or consult your dealer.
3)
Connect commutator's connector
CONTROL
, Pin 3 (GND, Shield) to the common
transceiver's ground;
NOTICE
The connection cable must be shielded.
4)
Connect commutator's connector
CONTROL
, Pin 4 (TXINHIBIT) to a dedicated transceiver's
input that disables transmission.
Transceiver producers give different names to this input and they are for instance
TX-INHIBIT, MUTE, LINEAR, ATU, etc.