[AMPS] Suppressors

[Steve Thompson]

-----Original Message-----
From: measures <2@vc.net>
To: Steve Thompson <rfamps@ic24.net>; AMPS <amps@contesting.com>
Date: 04 August 2000 15:41
Subject: Re: [AMPS] Suppressors


>>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.
----------
According to Wes' measurements, the suppressor contributes many 10s nH into
the circuit.

>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.


In terms of which defines which, it's the other way round. Q is defined by R
and X. The XL contributed by the suppressor appears to be unimportant in the
overall system, in which case the Q of the suppressor is unimportant in
overall terms. That's not to say that the inductor value in the suppressor
isn't important - you have to choose R and L values to give the ESR vs
frequency characteristic that you need.


Steve.



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