I re-tune when I see the output fall off by more than 10%. Or, during
contests, when people stop answering me. -WB2WIK/6
"Nobody needs more than 640k!" -Bill Gates, 1982
> -----Original Message-----
> From: Bill Turner [SMTP:dezrat1242@ispwest.com]
> Sent: Wednesday, December 22, 2004 8:18 AM
> To: kwasny; amps@contesting.com
> Subject: [BULK] - Re: [Amps] Tuning
>
> 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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