[Amps] R. MEASURES PRAYERS ANSWERED

[R L Measures]

On May 31, 2006, at 9:55 AM, Vic K2VCO wrote:

> k7fm wrote:
>
>> I have built amplifiers with and without parasitic suppressors and  
>> have had
>> parasitics in both - but then again, I am only an amateur.
>
> There's a technique described in my old ARRL Handbooks (1960's  
> vintage)
> to test an amplifier for self-oscillation -- at LF, HF, and VHF. It
> describes the testing procedure, and discusses creating a  
> suppressor (in
> the case of VHF parasitics) that will prevent oscillation with the
> smallest amount of loss.

  In an HF amplifier, the old ARRL Handbook test tests HF stability,  
not VHF stability.

> Rather than simply copying suppressors used in
> other amplifiers with physically different layouts, it seems to me  
> that
> this procedure is a reasonable thing to do when building an amplifier.
> It might turn out that no VHF suppressor is needed -- or not.
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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R L MEASURES, AG6K. 805-386-3734
r at somis.org