[AMPS] parasitic suppressors

[Rich Measures]

>
>The first point that we need to realsie is that you only get the parasitics
>if the Barkhausen criteria are satisfied at any particular frequency.  This,
>as Ian says, derives from the factors of gain and phase shift. 
>
>I still don't see any answer as to why the Q of a resistance wire inductor
>should actually be less as frequency increases than a parallel R-L
>combination 

€  It isn't. 

>which provides an impedance asymptotic to the resistance value.
>Which is another way of saying that the impedance tends to the value of the
>shunt resistance.

€  The frequency of oscillation is pretty much fixed.  
In a typical parasite suppressor, roughly equal vhf currents flow through 
R-sup and L-sup.   
Parallel R-L circuits are said to have an admittance. Series R-L circuits 
are said to have an impedance.  .  
>
>In these measurements of suppressors, what was the value of the shunting
>resistance? 

€  100 ohms.  

>If there wasn't one, all bets are off, since you are comparing
>apples and bananas.
>
-  later, Peter


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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