>
>
>-----Original Message-----
>From: measures <2@vc.net>
>To: Peter Chadwick <Peter_Chadwick@mitel.com>; AMPS <amps@contesting.com>;
>'Steve Thompson' <rfamps@ic24.net>
To: <amps@contesting.com>
>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
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|