[TowerTalk] Resonance is over rated

[Perry - K4PWO]

Resonance, in the normal sense has nothing to do with the value of impedance 
only in a minimum (for a series tuned configuration) or maximum (parallel 
tuned).  While its possible to make the argument that a dummy load is a 
resonant "antenna" with a Q of 1 (Q=Fr/BW or infinity/infinity) the concept 
of a "resonant frequency" of infinity is counter intuitive.  Since "dummy 
loads" are made with real world components, we know that the "resonant 
frequency" can not be infinity.  So in that sense, the "dummy load" is a 
very low, non unity Q "resonant circuit" but it fails in fitting a second 
order differential equation for circuit analysis.  If the shoe doesn't 
fit...
That still doesn't negate the fact that radiation efficiency is the key to 
propagating a signal.
BTW, I operate a fairly effective "dummy load" on HF... a B&W BWD-180 
terminated folded dipole.  It's pretty flat from 1.8 to 30 MHz. but its 
efficiency is all over the place in that range.
It works but...

73 de Perry - K4PWO


----- Original Message ----- 
From: "Scott McClements" <kc2pih at gmail.com>
To: <towertalk at contesting.com>
Sent: Friday, August 07, 2009 10:57 AM
Subject: Re: [TowerTalk] Resonance is over rated


How do you define resonance?  My dummyload on 80 meters shows an
impedance  of 55 + j0 Ohms, it doesn't get anymore resonant than that.

-Scott, WU2X

On Fri, Aug 7, 2009 at 3:37 AM, Perry - K4PWO<k4pwo at comcast.net> wrote:
> The dummy load isn't resonant
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