Which resonance ?
Certainly not below 2 MHz !
Plate choke resonances, a matter on HIGHER frequencies, are determined
by their inductance and capacitance between turns, not by choke and
bypass capacitors.
If the 50 uH + 8 uH and bypass caps. doesn't appear enough for 3.5 how
they decouple plate from HV filter capacitors ?
Progressively lowering the frequency tube is dynamically more and more
bypassed to gnd, not floating and risking oscillations.
73,
Mauri I4JMY
73,
Mauri I4JMY
> ---------- Initial message -----------
>
> From : owner-amps@contesting.com
> To : Peter Chadwick <Peter_Chadwick@mitel.com>,
amps@contesting.com, "'Radio WC6W'" <wc6w@juno.com>
> Cc :
> Date : Thu, 28 Sep 2000 16:29:02 +0100
> Subject : RE: [AMPS] Feedback path 3-500Z
>
>
> Thanks Marv.
>
> That plate choke must have a lot of RF circulating current in it on
3.5MHz,
> then. Calculating the various resonances in that lot isn't trivial;
you can see
> that depending on band and tuning/loading capacitor settings,
there's a
> resonance somewhere in the 0.5 to 2MHz region.
>
> As usual, the question is: Does it matter?
>
> Tom seems to be saying, 'Yes it can', while Rich appears unconvinced.
>
> Me, I'm fence sitting.
>
> 73
>
> Peter G3RZP
>
>
>
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