[Amps] Tuning

[Bill Turner]

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?
___________________________________________________________

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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