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a) GND stud - First connect the grounding stud of the amplifier (located on the rear panel and
marked GND – Fig. 2-1) to the grounding system of the shack.
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.
N O T E
Voltage on the KEY-IN jack does not exceed 12V and the current
is below 6mA. See also S. 8-2(a).
N O T E
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
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.
It can be used for improving the receive/transmit (RX/TX) switching safety.
C A U T I O N
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.
Summary of Contents for 700S
Page 1: ...OPERATING MANUAL ...