>
>Subject: Re: [AMPS] TL-922 Filament Transformer Protection
>Date sent: Mon, 7 Jun 99 08:58:18 -0500
>From: Jon Ogden <jono@enteract.com>
>To: <W8JI@contesting.com>, "Amps Reflector"
><amps@contesting.com>,
> "Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk>,
> "Merv Schweigert" <k9fd@htc.net>
>
>> >Ahh. But that was likely a fundamental oscillation, or a low order
>> >mode oscillation supported by the cavity. I can make an amp
>> >"explode" by making it arc on or near the fundamental. I can wipe
>> >out a bandswitch with a HF oscillation, or with excessive drive for the
>> >amount of loading used.
>>
>> OK. Since I have no idea of the frequency the oscillation occured at, I
>> can't confirm or refute your statement.
>
>The nice thing about good circuit theory that follows all the rules is
>it can be used to confirm or "cull out" causes and effects.
>
>Unless you have a very high Z in the shunt components of the HF
>tank at VHF, or some pretty poor wiring or connections, it is
>impossible to have a VHF parasitic arc across a bandswitch.
>
? Impossible? see page 33 in the Oct., 1990 *QST*. I observed no "poor
wiring" in this TL-922.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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