>
>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
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|