[TowerTalk] Ground radials/elevated radials

[hermans]

Hello,

Since the question is back and actual.
Never saw somewhere a particular cases as: 
- unequal distribution of radians.
- my tower is a triangular selfsupported one.
-My lot has a triangular shape.
I can not reach all azimuths since the tower is only 20' away of the
house which is about thirty width .
Since I can't reach the grass directly from the base of the tower. What
will happen if the distribution of the radials will start 6 or 7 foot
from the tower, connected to a single wire.
Not in all azimuth can be reached and more then half of the number will
be shorter then a Lambda/4 ?
More , is it allowed to change a radial from direction on its run. 
As one can see, this a very irregular shape....

After this question an other will follow about general behaviour of
loaded Tower, and loading technicalities. 

Thanks for reading me.

Jos on4kj  

  

-----Message d'origine-----
De : towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] De la part de Tom Rauch
Envoyé : vendredi 22 octobre 2004 15:51
À : Yo3ctk; towertalk at contesting.com
Objet : Re: [TowerTalk] Ground radials/elevated radials


> The same would hold true for elevated radials?

Elevated radials are overrated. Unless you can get them up
1/4 wl or more in the air, you will still contend with
ground losses when you only use a few radials. Also the
system is NOT fully unbalanced when you use a small
counterpoise. It is in the murkey land of not being balanced
and  not being totally unbalanced.

> I am designing a 4-square for 80m. Full size verticals.
Comteq
> phasing/switching unit. But I need elevated radials for
practical reasons
> (the land below is used for small-size agriculture). I am
not sure how  many
> and how long radials are needed for each antenna. I am not
after the
> ultimate system, only one with decent results.

When I tested systems at a few locations, I found I needed
about 15-20 elevated radials (up about 6 ft) to equal 60 on
the ground. You will still need a choke or current balun to
cool off the feedlines in some cases even with 15 radials.



_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with
any questions and ask for Sherman, W2FLA.

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