Re: [IRCA] Wellbrook versus Beverage comparisons

[Rick Kunath <k9ao@xxxxxxxxxxx>]

Not sure what went odd about the formatting in the message Chuck?

Chuck Hutton wrote:

> The "averaging" is a form of "diversity reception". People have taken measu=
> rements and found that fading is not identical (time-wise) when antennas ar=
> e separated as little as 1/10 of a wavelength and almost non-identical as s=
> eparation reaches 1/4 wavelength. This is a big reason why a long=2C long a=
> ntenna like the Beverage seems to deliver more usable signals.

Yes.

> As for aperture and sampling=2C size is not such a great way to evaluate th=
> ings. A horizontal travelling wave antenna like the Beverage is a very inef=
> ficient sampler. While exact figures depend on ground and height above grou=
> nd=2C a decent rule of thumb is that it extracts about 10% of the signal co=
> mpared to a vertical.

It is inefficient in transfer of energy into the beverage from the 
traveling wave, but the antenna size means that the aperture, i.e. area 
of space that it is coupled into, is still much larger than a typical 
wire loop. Efficiency included. So the effect of averaging the 
ionospheric effects is still there.

I think that's what you just said another way.

Rick Kunath



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