28
Output power is 2597 W, reflected
power about 2W and screen current is
about +15 mA.
NOTE: If your antenna impedance is
different than real 50 Ohms or screen
current is more than +40mA then can be
necessary to start the M-TUNE
procedure to optimize the PA tuning.
Press MENU, M-TUNE) and make the
manual adjustment.
This is the result after manual
adjustment process. Screen current is
now abt. +5 mA.
These parameters were SAVED.
NOTE: The OM2501A is factory adjusted to a maximum output power of 2500W into a 50 Ohm load.
A unique Tuning table, with TUNE and LOAD values for every band, is supplied with each PA.
When the antenna impedance has greater variance from 50 Ohms, it may be the case that the PA
cannot deliver the full power 2500W, or some of the protection circuits may be automatically
activated. In such cases we recommend doing a manual tuning. (M-TUNE)
The best indication of proper PA tuning is the Screen Current. In the properly tuned PA this should
be within 0 to + 20mA (at full output power).
M-TUNE Tuning procedure:
• Press M-TUNE button. If CAT is active, the TCVR will automatically tune itself to the middle
frequency of the segment. If NO CAT, you must tune the TCVR manually to the segment
center frequency. If NO CAT but using BCD, the band will be changed but the segment will
only be set after keying. (Set CW or RTTY mode in the TCVR.)
NOTE: Set input power to about 25 watts to begin.
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