Acom 1200S Manuale operativo - Pagina 8

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b) KEY-IN jack - 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 output of your transceiver, providing "ground on transmit", to the KEY-IN

input on the amplifier rear panel (RCA PHONO jack – Fig. 2-1). Use a standard RCA PHONO plug for

connection to the amplifier.

Transceiver manufacturers give different names to this output, for example: TX-GND, SEND, T/R LINE,

RELAY, and others. In some transceivers "ground on transmit" output should be activated by a menu

or via changing a switch on the rear panel or inside the transceiver. See instructions in your transceiver

manual.

c) KEY-OUT jack - transmit-enabling control output from amplifier to the transceiver.

The KEY-OUT jack on the rear panel provides an extra control signal from the amplifier to the transceiver.

This can be used for improving the receive/transmit (RX/TX) switching safety.

If your transceiver has a suitable input, that disables transmission unless grounded externally, we

recommend this to be connected to the KEY-OUT jack of the amplifier. Use shielded cable terminated

with а standard RCA PHONO plug.

Voltage on the KEY-IN jack does not exceed 12V and the current

is below 6mA. See also S. 8-2(a).

Your amplifier will not work if the KEY-IN input is not connected

correctly. If you experience any difficulty consult your dealer.

Fig. 2-1 Rear panel connections

KEY-OUT is a low-powered open-collector output, make sure

that the signal voltage coming from the respective transceiver

connection does not exceed 50VDC (open circuit) and the closed-

circuit current is below 20mA.

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