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[AMPS] Suppressors

To: <amps@contesting.com>
Subject: [AMPS] Suppressors
From: 2@vc.net (measures)
Date: Thu, 3 Aug 2000 08:08:21 -0700
>
>Steve says:
>
>>The suppressor works in series from the anode to the tank circuit, so it's 
the 
>
>>series equivalent that's most useful in visualising what is going on.
>
>Especially when you remember that if the anode circuit parasitic resonance is
>lower in frequency than the grid circuit parasitic resonance, the thing won't
>oscillate anyway.
>
semi-agreed
>
>For what it's worth, my feeling is that the series inductance lowers the main
>parasitic frequency of the anode circuit below that of the grid circuit. By
>reducing the Q of the parasitic circuit, the amount of loading needed is
>reduced., because the gain at the parasitic frequency is reduced.
>
This is not borne out in practice.  Anode-resonance frequency is not 
changed much when the suppressor is shorted out.  

>I have not yet seen any analysis which shows why the XL of the suppressor 
>should be designed to equal the shunt resistance of the suppressor at any 
particular
>freqeuncy.
>
The goal is to introduce a staggered resonance, sans  ethanol.  The 
resistance, R-supp, forms a lower inductance resonance.  L-supp forms a 
higher inductance circuit with a slightly lower resonance.  The net 
result is broadbanding that is quite similar to stagger tuning IF 
transformers.  .    

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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