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[AMPS] TL-922 Filament Transformer Protection

To: <amps@contesting.com>
Subject: [AMPS] TL-922 Filament Transformer Protection
From: measures@vc.net (Rich Measures)
Date: Mon, 7 Jun 1999 09:22:51 -0700


>
>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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