OM POWER OM2000A+ Manual page 30

Notice: OM2000A+ is factory adjusted to maximum output power of 2000W ( 1500W for US models) to the real
load 50 Ohms. Unique Tuning table with TUNE and LOAD values for every band is supplied with each PA.
When the antenna impedance has greater tolerance, it may be the case that the PA cannot deliver the full power
2000W, or some of protection circuits will be automatically activated. In such a case we recommend to do manual
tuning.
The best indication of proper PA tuning is the Screen Current. In the properly tuned PA to be within 0 to + 20mA
(at full or used output power).
Tuning procedure:

Press M-TUNE button. IF CAT is active, TCVR will automatically tune itself to the middle frequency of the
segment. If NO CAT, you must tune TCVR manually to the segment center frequency. If NO CAT but BCD,
band will be changed but segment will be set after keying. Set CW or RTTY mode in the TCVR. Set input
power to abt. 50%.

Press PTT, check the Ig2 (I Screen on the display). If it is ok (0-20mA), increase gradually the input power
of the PA to reach abt. 70% of its maximum output power.

With TUNE buttons adjust maximum FORWARD POWER while monitoring the Screen current.
Output power is 1507W, reflected power
reached abt. 4W and screen current is abt. -8
Type of supported TCVR and working
mA.
frequency are visible on the display.
If your antenna has different impedance than
real 50 Ohms then is necessary to start the M-
TUNE procedure to optimize PA adjustment
(press MENU, M-TUNE) and make the manual
adjustment.
This is the result after manual adjustment
Type of supported TCVR and working
process. Output power increased to 1585 W.
frequency are visible on the display.
Screen current is now abt. +10 mA.
These parameters were SAVED.
AUTO LED is ON.
AUTO LED is ON.
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