On Wednesday 23 February 2005 16:09, R.Measures wrote:
> On Feb 23, 2005, at 4:11 AM, Dennis12Amplify@aol.com wrote:
> > In a message dated 2/22/05 3:17:22 PM Central Standard Time,
> > TexasRF@aol.com
> > writes:
> >
> > Anyone out there willing to give this test procedure a try? I am at
> > work
> > right now and no access to a big PA to check this out.
> >
> > Standing by for test results!
> >
> >
> > Tom,
> >
> > I have tried that a few times in the past because I was also looking
> > for
> > tuning (or pretuning) shortcuts; and found that the dip meter
> > indicated the
> > output tank's resonant frequency to be slightly lower than the
> > frequency the
> > plate current dip was obtained at.
Forgive me, I haven't been paying attention. Is the resonant frequency
measured with the antenna connected?
>
> Dennis O.: I found the same thing, which is what got me thinking about
> how a Pi-network works -- i. e., that it's actually two L-network /
> Z-transformers in series. However, the confusion is understandable
> since two L-networks in series is similar to a tank circuit in that it
> provides a flywheel effect to augment the non-conduction half of the
> sinewave in other than Class A amplifiers,
Is it valid to look at the pi network as a tuned circuit with a capacitive
divider but the resonant frequency is affected by the low loaded Q when the
load is connected?
Steve
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