User's Manual

Exhibit 6 page 22 of 33

5.3.2. Tuning Adjustment

OM2500A has been design to deliver maximum output power at 50 Ohms load. To deliver

maximum output to a real load you need to adjust the tuning according to your real antenna

impedance.

Entering the TUNE mode is done by pressing the TUNE button. The OM2500A then

switches the transceiver to RTTY and sets the frequency to corresponding segment. By

changing the values of TUNE and LOAD capacitors we tune the PA as per manual tuning

instructions. The optimally tuned amplifier will deliver full output without approaching the

maximum Screen Current of 30mA!

After tuning the amplifier save the settings by pressing SET and PA will automatically tune

frequency of your transceiver to next band segment. Follow the same procedure for all bands

and segments if needed.

By pressing MAN or AUTO buttons PA and TCVR will return to standard operating mode.

Deviding of bands into segments

Band (MHz)

1,8

3,5

Width of the segments (kHz)