>
>Rich says:
>
> >? When an L-network is resonant, it is a dead short, Peter.
>
>Rubbish. Twaddle. WRONG!!! Do the mathematics of series parallel transforms.
>
? If the reactance of the inductor is equal to the reactance of the
capacitor, the L-network presents a short to the generator. What is the
impedance of a series-resonant circuit?
>> > The Eimac definition of R/XC1 is one. The other definition of Q is a
>>> lot more complicated and gives a different result. I use Eimac Q. I am
lazy.
>
>That's an approximation that applies only to the complete network and falls
>over at low values of Q. It may be one you can get away with - it doesn't
>mean that it's right.
>
? Are Ian's calculations acceptable to you?.
> >> Further, you have not yet given a rigorous definition of
>resonance
> >>capable of being modelled mathematically.
>
>> equal and opposite reactance - - which does not mysteriously
>>disappear whenever a dipmeter is brought near.
>
>Only applicable to very simple circuits, and the 'resonant' frequency that
>it gives is not the resonant frequency that we want - which is where the
>correct non reactive load is presented to the PA tube.
? We have a simple Pi-network. We will connect correct RL and Rout
resistances to the ends of the Pi-network.
>
>>? The advantage of the dipmeter is that it obviates prestidigitations.
>
>Reinforces misconceptions about technical matters.
? Mr. Rauch groused similarly about the intrinsic evils of dipmeters
when I discovered that a directly grounded grid had a slightly lower
resonant freq. than when it was instead grounded through a series
capacitance.
>
- cheers, Peter
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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