At 06:56 AM 12/22/2004, kwasny wrote:
I have a question that I have never seen the answer to in any amp manuals.
After tuning the amp, how far up or down in frequency can you move without
retuning the amplifer?
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There are lots of variables, especially the antenna, but as a rule of thumb
on 20 meters, I would retune after QSYing about 100 kHz. This is
proportional to frequency, so on 10 meters, about 200 kHz. What you will
notice is a significant change in plate and/or grid current.
A very narrowband antenna such as an inductively loaded dipole will require
the amp to be retuned after a smaller frequency change.
YMMV, but this should get you started.
--
Bill, W6WRT
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