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
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|