> Dave says:
> > 1. select an appropriate circuit modeling program
> >
> > 2. construct a model of the tube in question, parametizing
> manufacturing
> > variances
> .
> > 3. construct a model of an amplifier circuit in question, parametizing
> >component tolerances
> >
> > 4. discover combinations of parameters, if any, under which VHF
> >oscillation occurs
> >
> >5. construct models of alternative VHF oscillation-suppressing circuits,
> >and evaluate their effectiveness and side-effects
> The question is how long this will take - especially 1.
Traditional techniques have failed to resolve the case in question --
whether or not VHF oscillations occur, and how to best suppress them if they
do -- in at least 3 years of near-daily interchange on this reflector. The
combatants are personally motivated to conclusively prove their hypotheses;
based on the continuing polarization, no one has come close.
One must consider effectiveness when comparing techniques, not just
convenience or familiarity.
73,
Dave, AA6YQ
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