[Amps] antennas that are 1:1 vswr all over the band
David Kirkby
david.kirkby at onetel.net
Fri Dec 24 09:34:13 EST 2004
Bill Turner wrote:
> At 12:27 PM 12/23/2004, David Kirkby wrote:
>
>> Not what you want I am sure, but here's an interesting exercise for
>> those with some AC theory. The relevance to your question will be
>> apparent to anyone able to get the right answer.
>
>
> I don't think there is a "right" answer, for two reasons:
>
> 1. You have to define what you mean by "resonance"? Is it the
> frequency where the E/I phase shift is zero or the frequency of
> maximum impedance?
Well I thought the definition of resonance in an electrical circuit was
the frequency at which the phase shift is zero.
> 2. What are the values of all the components? They all have an effect.
No. You will get the same answer, no matter what value you choose for L
and C, as long as R=sqrt(L/C), which is what I stated it had to be.
There is no need for me to state L or C - the answer is independent of
them, as long as you make R=sqrt(L/C).
If you want to simulate it, rather than analytically determine it, just
pick a random value for L, a random value for C, and make R=sqrt(L/C).
David Kirkby, G8WRB
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