Acom 2000A Operating Manual page 12

a) Connect the ground stud of the amplifier Main Unit (on the rear panel, marked GND) to
the station's grounding system (Fig.2-2, Fig.2-3 & Fig 2-4).
b) Connect a coaxial cable with a PL-259 plug from the transceiver output to the amplifier
rear panel RF INPUT socket.
If this is the first time you will use a high power amplifier in your station, pay
attention to the coaxial cable type from the amplifier's output. It must handle
the increased power safely - particularly on the higher frequency bands. We
recommend you use RG213 or better coaxial cable. Similar good quality coaxial
cable should be used throughout your antenna system. Check the power
capability of the antenna selector, the tuner and the antenna itself (especially
multiband trap antennas).
Do not use your transceiver's internal tuner with the 2000A –this can damage
the input of the 2000A
c) Connect a coaxial cable from the amplifier output (on the rear panel, marked RF OUTPUT)
with a PL-259 plug to the antenna selector or tuner or to the antenna for the respective band
Your amplifier will not work if KEY-IN is not connected properly.
Transceiver producers give different names to this output and they are for instance TX-GND,
SEND, T/R-LINE, etc. Some transceivers require that "ground on transmit" is implemented via
a software command, or by changing the setting of a switch on the rear panel, or interior of the
transceiver. Check your transceiver's manual.
d) Run a cable terminated in a RCA phono plug from the transceiver socket providing "ground
on transmit" to the RCU rear panel KEY-IN socket.
If there is a CAT connection between your amplifier and your transceiver, which
carries also the KEY-IN signal, you don't need a separate KEY-IN cable. Not
all transceivers however have this capability. Please see section 7 for more
details.
e) The KEY-OUT socket on the RCU rear panel provides an extra control signal from the amplifier
to the transceiver. It could be used to improve the transmit/receive switching.
If your transceiver has a suitable input that disables transmission, we recommend that you
connect it with a cable terminated in a Phono connector to the KEY-OUT socket of the RCU.
Transceiver producers give different names to this input and they are for instance TX-INHIBIT,
MUTE, LINEAR, etc. Check your transceiver's manual. Consult your dealer or see the
TECHNICAL SUPPLEMENT for details.
If your transceiver has not such an input don't worry - the amplifier will function normally as well
and then the KEY-OUT may remain unused.
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