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Rear view of the amplifier
OM4000 HF
AC SOCKETS FUSES OUTPUT
CONTROL
INPUT
4.3. Control Cable
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 OM4000 HF 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).
KEY IN
RCA Phono
-
Input signal PTT switching voltage / current 5V /2 mA)
KEY OUT
RCA Phono - Output signal PTT (maximum switching of 30V / 50mA)
