[AMPS] Suppressors

[measures]

>
>
>-----Original Message-----
>From: measures <2@vc.net>
>To: Peter Chadwick <Peter_Chadwick@mitel.com>; AMPS <amps@contesting.com>;
>'Steve Thompson' <rfamps@ic24.net>
>Date: 03 August 2000 16:11
>Subject: RE: [AMPS] Suppressors
>
>snip
>>>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.
>
>
>In which case, the inductance contributed by the suppressor must be
>insignificant in the system. 

The suppressor was shorted out by c. 1" of copper wire.  This has c. 
10nH, about the same L as R-supp.  This is why the anode resonance 
changes little. 

>This means that Q of the suppressor alone is
>unimportant - the only thing that counts is its ESR vs frequency
>characteristic.
>
€  VHF ESR is directly related to VHF Q.  

cheers, Steve.  

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


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