OM POWER X8NOM4000A, Instruction Manual, Page: 10 / 38

Page 10 from 38
Rear view of the amplifier OM4000A
AC Sockets Fuses OUTPUT
REMOTE I / O Interface INPUT
4.3. I/O Box and Interface
Control of Amplifier and communication with TCVR as well as Antennas / BPF switching can be
done via the rear panel I/O Interface.
Control cable maintains TX / RX switching of the PA (TX GND). The cable is shielded. On the
side of the power amplifier a CINCH-socket is used. On the side of your transceiver you have to
use a socket suitable for this transceiver. During transmitting the middle pin is connected to
the ground.
The relays of the OM4000A have to be switched earlier than HF is applied (cold switching).
Modern transceivers they have a time delay between PTT switching and power output.
CAUTION
If you are using and older transceiver or transmitters without time delay, we recommend
to connect the PA in such a way that the transmit/receive switch (foot switch for example)
is connected with the KEY IN socket of the amplifier. The KEY OUT socket is to be
connected with the PTT socket at the transceiver.
The amplifier is equipped with two safety devices, which ensure that the output relay is not
switched under power mistakenly (hot switching).