OM POWER OM2500 A, Instruction Manual

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Please note!
If the input power is higher than 15 W and the power amplifier is not correctly tuned, the safety
devices will switch to STBY.
After switching the amplifier to PTT, the amplifier will automatically reset and switch back to OPR
mode after approximately 2 seconds.
5. Set TUNE in such a way, that the TUNE-LED lights up maximum left.
6. Set LOAD in such a way, that the TUNE LED on the TUNE scale lights up under
the “ V ” sign. If it is possible to obtain the LOAD in 2 positions, set the position
that is father to the right.
7.
Repeat tuning several times according to 5 and 6.
8. Increase the input power until an output power of approximately 2500 W is reached.
9. Repeat steps 6 and 7
10. Set TUNE to maximum output power
After this procedure the amplifier is tuned correctly and ready to give 3500W output power in all
operation modes. At optimal tuning and full output power a positive 50mA voltage goes through the
second grid. On 24 and 28 MHz bands optimal tuning can be achieved when one or two LEDs are lit
up to the left from the position “V”. If less output is desired you can simply decrease the load of the
transceiver.
Please note: Should the amplifier demonstrate any malfunctions during
tuning or should it not behave in accordance witch the description,
interrupt the tuning procedure immediately and check the amplifier!
Be sure to have not done any mistakes in choosing bands or TUNE/LOAD
values!
Be sure that SWR is not higher than 1:2 and input power is LOW!
After excluding human mistakes you will be able to work for long time with
this amplifier!