User Manual

 The toroidal transformers are switched on step by step.

 The cooling blower for the final tube is switched on.

 The multi-meter bar graph measures the high voltage; the normal value is 2.8 kV

 The WAIT LED lights up

CAUTION

After switching on, please confirm that the blower is operating properly. Air must be

flowing from the ventilating aperture above the tube. If there is any concern, or no air

flow, press the “OFF”-button immediately !

Heating the tube takes about 150 seconds. After this time the WAIT LED goes out and the

amplifier is ready for operation.

4. Reduce the power output of your transceiver to the minimum!

5. Switch OPR/STBY to OPR position (OPR LED lights up)

6. Choose the TUNE position of multimeter

7. Transmit (mode CW) and increase driver power to 10W (OUTPUT power will be abt.

500W)

CAUTION

If the input power is higher than 15W and the power amplifier is not correctly tuned,

the safety devices will switch to STBY.

After switching the amplifier to STBY, the amplifier will automatically reset and switch back

to OPR mode after approximately 2 seconds.

A tuning table is delivered with the power amplifier. Select a band with band switch and

choose the setting of “TUNE” and “LOAD” according to the table.

NOTE

Delivered tuning table was made for 50 Ohm loading of PA (dummy load). Each amplifier

should have different values depending on used frequency and used type of antenna. Make

your own table valid for your real conditions.

Band

Tune

Load

1.8

3.5