NOTICE
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 connector (see Figure 2-3 | Amplifier rear panel - Connections, Pos. (c)) of the amplifier.
ACOM 2020S 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 connector
Connect a suitable coaxial cable from the transceiver output to the amplifier RF INPUT SO-239 connector
(see Figure 2-3 | Amplifier rear panel - Connections, Pos. (d)), using PL-259 plug.
NOTICE
In order to avoid a damage (not covered by the warranty), turn off your transceiver's
internal antenna tuner.
e) RF OUTPUT connector
NOTICE
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 Figure 2-3 | Amplifier rear panel
- Connections, Pos. (e)) to the antenna switch or tuner, or to antenna for the respective frequency band.
f) RCU connector
Connect the ACOM 2020S - RCU R05 connection cable (part of delivery - see 1.4 Equipment Supplied, Pos. 3)
from the connector RCU (see Figure 2-3 | Amplifier rear panel - Connections, Pos. (f)) to the connector
AMPLIFIER located on the RCU rear panel (see Figure 2-6 | RCU model R05 rear panel, Pos. (i)).
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