[AMPS] Feedback path 3-500Z

[i4jmy@iol.it]

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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> 


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