Figure 2-1 Rear Panel - Connections - Acom 700S User Manual

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
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b) KEY-IN socket
Amplifier input for receive/transmit control from the transceiver.
The transceiver switches the amplifier from receive mode into transmit mode (RX/TX) by grounding of the
KEY-IN input.
Run a shielded cable from the "ground on transmit" socket or terminal on your transceiver to the amplifier
rear panel KEY-IN socket. The KEY-IN socket uses a standard RCA phono plug.
Voltage on the KEY-IN jack does not exceed 12 V and the current is below 6 mA (see
Section
8.2.a) Receive / transmit control
Your amplifier will not work if KEY-IN input is not connected properly.
Transceiver producers give different names to this output and they are for instance
TX-GND, SEND, T/R-LINE, PTT, 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.
May 2021
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Figure 2-1 Rear panel - Connections

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S e c t i o n INSTALLATION | Page 15 of 52
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