CTI ComTec, Inc. PLA-800 Manuel de l'utilisateur - Page 6

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Tuning Procedure

On the rear panel of the PLA-800 you will see the Power Output Connector or RF Out

(SO239), a High Voltage connector, a Control Voltage Connector, a Push-to-Talk jack, a

Ground Connector, and the Power Input Connector (SO239) or RF In.

Connect the Control Voltage Connector and High Voltage Connector between the

amplifier and power supply. The power supply has the appropriate mating connectors

along with the AC input power plug. The AC input power can be adapted to 115 VAC or

230 VAC service (See power change over section).

Apply the RF in coax connector from your transceiver. A transceiver with a variable

output control should be used. That is, one which can vary the amount of drive power to

the amplifier. Set your drive control on the transceiver to minimum. Connect the PTT

(push-to-talk) connection using the RCA jack to your transceiver. This will put the

amplifier into the circuit when you transmit from your transceiver. In the receive mode,

the amplifier will be in by-pass.

Connect a coax line from the RF OUT to your tuner or directly into your antenna load. An

output power watt meter should be used, in-line with the antenna. This should be used to

tune the amplifier correctly.

Upon completion of the above, double check all connections to make sure they are

installed correctly and tightly.

Apply AC power by switching on the Main Power Switch on the power supply front panel.

The green indicator light will illuminate and the yellow filament light on the amplifier will

illuminate. Be certain that the plate switch on the amplifier is OFF. You will hear the fans

in the amplifier also begin to operate. Let the amplifier warm up for approximately 60

seconds. This will ensure that the filaments of the 4CX250Bs will come up to temperature.

After 60 seconds of warm up, turn on the plate switch located on the front panel of the

amplifier. Observe the meter readings on the amplifier. The plate meter should come off

of the Zero position by about 10 ma. and the screen current meter should read 0 ma. These

are the resting currents for both circuits without drive applied.

Select the desired band for both amplifier and driver. Simply turn the band switch on the

amplifier to the desired band. Place the driver (transceiver) in the CW mode. If you have

a transceiver with an Auto Tune Control, press the auto-tune function.

With the key down on the transceiver, begin to increase the drive control on the transceiver

and bring the plate current on the amplifier to approximately 300 ma. Begin tuning the

plate turning control and the loading control fir a maximum reading on the power watt

meter. If you have a tuner with an SWR meter in the circuit, be sure to tune the SWR for

minimum. Remember, the maximum output with minimum SWR. Continue to tune at this

power level until you are confident that the amplifier is adjusted properly. It is possible to

tune the amplifier too heavily. Continue to adjust the output for maximum by alternating