User's Manual | ACOM 500S | 160-4
m Linear Power Amplifier
Page 20 of 66 | S e c t i o n INSTALLATION
March 2023
Figure 2-3 | Rear panel - Connections
Figure 2-3 | Rear panel - Connections
a)
GND
stud
First, connect the wing-nut grounding stud of the amplifier (on the rear panel, marked
GND
) to the station's
grounding system (see
Figure 2-3 | Rear panel - Connections
, Pos. (a)).
WARNING
Note that the grounding system may have to withstand currents over 15 A with
insignificant voltage drop on it. Therefore, it may be necessary to improve it considerably,
i.e., to become less resistive, with heavier leads and lower-resistive ground path. The
grounding leads should be at least 4 mm
²
(AWG 11 or SWG 13).
For details and recommendations on the grounding and RF counterpoise system concerning the
electromagnetic compatibility see also Section
3.6.f) Elimination of electromagnetic compatibility (EMC)
b)
KEY IN
connector
This is the amplifier's 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" connector or terminal on your transceiver to the
amplifier rear panel
KEY IN
connector (see
Figure 2-3 | Rear panel - Connections
, Pos. (b)). The
KEY IN
connector
uses a standard RCA phono plug.
