Re: converting from dipole/inverted vee to beam
- From: Roy Lewallen <w7el@xxxxxxxxx>
- Date: Fri, 26 May 2006 08:32:25 -0700
Jerry Martes wrote:
"Buck" <not@xxxxxxxxx> wrote in message news:g00e72lh8n694shm5fh3bnkva8ovu76koc@xxxxxxxxxxI have a wire dipole and an inverted Vee each cut to resonance on a
desired frequency. I would like to add a reflector and/or a director
(one at the time) to make each one a beam. Will adding the reflector
and/or director change the resonant frequency, or just the impedance?
Thanks
Buck
n4pgw
--
73 for now
Buck
N4PGW
Hi Buck
Isnt Resonance defined as the frequency where the Impedance has *no* reactance? Wouldnt that imply that the resonant frequency of the antenna will always change if its impedance changes?
Can you *ever* change one without changing the other?
You're correct about the definition of resonance.
Buck's statement would have made more sense if it the last words were "just the resistance", and that's likely what he meant.
Sure, you can change the impedance without changing the resonant frequency -- a transformer will do that, for example. At resonance, the resistance will simply be a different value.
But to answer Buck's question, adding another element will almost certainly change both the resistance and reactance at the feedpoint, and therefore the resonant frequency.
Roy Lewallen, W7EL
.
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