Topband: raised radials
Carl
km1h at jeremy.mv.com
Sat Dec 15 21:23:23 EST 2012
You ever wonder why a few on here are so much louder than their competition
with similar installations when 1-2 keep trying to make us believe it has
nothing to do with the radials beyond a small number? IF he is correct then
why the big difference? Anybody care to offer a guess?
Or the fellow on a city lot that knows he is 10dB below the guy a mile away
out in the country with a big vertical or T with lots of long radials plus a
base mesh....after several years of comparisons. You dont need fancy test
equipment to see that.
Ever wonder why photos of elevated radial BC antennas show a base mesh and a
small number of radials? And then performance tests require a reduction in
power to conform to the canned 120 radials in the ground benchmark signal
strength. Or due to the stations original certification with a full set of
base radials that rotted away and the elevated are the replacements.
Or the person on here who went from an extensive radial system to a full
screen claimed a 5dB improvement but now denys the possibility. Its in the
TB archives from 1998.
A few seem to be in a continuous rut with impedance the only factor they
seem to mention. There is a lot more than just the immediate soil under the
radials that is involved when it comes to field strength many wavelengths or
continents away which also affects the energy in a particular elevation
angle.
Carl
KM1H
----- Original Message -----
From: "Charlie Cunningham" <charlie-> Hee! :- )
>
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Tom
> W8JI
> Sent: Saturday, December 15, 2012 7:12 PM
> To: DAVID CUTHBERT; Carl
> Cc: David Michael Gaytko // WD4KPD; topband at contesting.com
> Subject: Re: Topband: raised radials
>
>
>> That is quite an improvement. I had to have dropped the base impedance
>> from
>> 400 ohms to 40 ohms for it to do that.
>>
>
> Things are often magic when we rely on feelings or emotions to measure
> decibels.
>
>
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