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Old November 7th 07, 07:26 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Jul 2006
Posts: 757
Default 80m Vertical over lossy soil

On Nov 7, 6:24 am, Denny wrote:


Now, there are those who like elevated radials Christman and those
who hate em Rauch..


Dunno..I can't remember W8JI using elevated verticals..
He may be seeing a large number of people that
run elevated, but don't use enough radials for the
height in wavelength. Most don't, and then wonder
why they don't play as planned..
Most 160m elevated verticals are still going to be low
to the ground as far as wavelength.
Sixty feet is only 1/8 wave. To equal a GP at 1/2 wave
requires appx 60 radials. This also equals 120 radials on
the ground. 1/4 wave up requires appx 8-10 or so radials
to equal the same ground loss.
On 160m, many think they can elevate a vertical 20
ft or so, and use maybe 4-8-10 radials to get good
performance.
It just doesn't work that way. At such a low height in WL,
they need almost as many as a ground mount.
On 160m, a ground mount is really more practical as
everything is large. It will be a lot easier to plant
60+ radials on the ground than it will be to raise the
vertical to a decent height. This might apply to 80m
also for most people..
But on 40m, it's not hard to set up a decent GP,
and my 32 ft whip was fully self supporting.


Now a dipole or vee at 130 feet is simply not going to work on 160,
period... Oh yeah, you can wow the guys at 700 miles with your NVIS
signal, but you will get trampled in a dx pileup...


Heck, W8JI ran a 160m dipole at 300+ ft.. The verticals still
won as a transmit antenna to DX. I think he uses 60 radials,
unless he's added more since that time. I forgot what his
vertical is.. A tower of some fairly tall height... It ain't no
typical ????
brand multiband dummy load on a stick... :/
MK




 
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