Control Cable; Cooling - OM POWER OM2000A+ Manual

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 OM2000A+ have to
be switched earlier than HF is applied (cold switching). Modern transceivers they have a time delay between PTT
switching and power output.
If you are using an 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.
If there is possible to adjust TX delay in your TCVR, set the delay to 10ms, please.
The amplifier is equipped with 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 /2mA)
KEY OUT RCA Phono - Output signal PTT (maximum switching of 30V / 50mA)
See section 7.6. for Control and ANT/BPF connectors PIN-OUT.
Be sure that your power system is correctly wired and properly rated! To use adequately sized and
connected grounding system is also very important!
4.4.

Cooling

The amplifier must be installed in such a way that free flow of hot air from the tube is allowed. Do not
obstruct air intake and exhaust areas of the PA.
The centrifugal blower provides the necessary cooling of the amplifier, even during long contests. The blower is
activated by switching the PA on and it is turned off when cooling is finished (approx. 1-5 min after switching off
the PA depending on the temperature of the tube). Blower working mode is programmable (3 modes). See page
19 for more details.
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