Acom 1200S Installation, Operation And Maintenance Manual page 18

KEY-OUT is a low-power open-drain output, make sure that the signal voltage coming
from the respective transceiver connection does not exceed 50 VDC (open circuit) and
the closed-circuit current is below 20 mA.
If your transceiver has a suitable input that disables transmission unless grounded externally, we
recommend that you connect it with a shielded cable terminated in a Phono (RCA) connector to the
KEY-OUT socket (see
Figure 2-2 Rear panel - Connections
ACOM 1200S will operate normally with KEY-OUT unconnected if your transceiver has
no such input.
Transceiver producers give different names to this input and they are for instance
TX-INHIBIT, MUTE, LINEAR, etc. Check your transceiver's manual.
d) RF INPUT socket
Connect a suitable coaxial cable from the transceiver output to the amplifier RF INPUT SO-239 socket (see
Figure 2-2 Rear panel - Connections
In order to avoid a damage, turn off your transceiver's internal antenna tuner.
e) RF OUTPUT socket
If this is the first time you will use a power amplifier in your station, pay attention to the
coaxial cable type from the amplifier's output to the antenna. It must handle the
increased power safely, particularly on the 10- and 6 meters bands. We recommend that
you use RG213 cable or better. Check the same for the antenna switch and tuner, as
well as the whole antenna system (especially multi-band trap antennas).
Connect a suitable coaxial cable with a PL-259 plug from the RF OUTPUT (see
, Pos. (e)) to the antenna switch or tuner, or to antenna for the respective frequency band.
Connections
Page 18 of 60 | S e c t i o n INSTALLATION
User's Manual | ACOM 1200S | 1.8-54 MHz Linear Power Amplifier
NOTICE
, Pos. (c)) of the amplifier.
, Pos. (d)), using PL-259 plug.
NOTICE
NOTICE
Figure 2-2 Rear panel -
August 2021