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LF: Re: TX with LOOP

To: [email protected]
Subject: LF: Re: TX with LOOP
From: "g3ldo" <[email protected]>
Date: Sat, 25 Jan 2003 23:18:31 -0000
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Werner ON6ND said

----------------------------------------------
Just made a test with a horizontal loop antenna
and made QSO with F6BWO--F6CNI--DL3FDO
At first sight it work FB
Loop perimeter is 85 meters and 12 meters above ground
Series coil is 1.5 mH series cap is home made butterfly 280 pf
plate space is 20mm, current in the circuit is 3.5 Amp
Cap and coil are in the shack , and two wires are going
out through the wall widely spaced from the wall, and so
straight to the loop .
In the shack it smells like ozone Hi
---------------------------------------------
Interesting! Most loops tried in the past have been vertical because then
you only need two supporting masts. If this antenna is square or a rectangle
then you will need four.
I tried making an EZNEC model of this antenna but the results are not
reliable for two reasons: the antenna is an electrically small loop and it
is electrically very close to the ground. Even a free space model seemed
quite lossy (-40+dBi). For what its worth changing the quality of ground
material had little effect on a ground model; unlike a Marconi. The other
characteristic is that the greatest gain was at 45 degrees - good sky wave.
Not the sort of antenna a commercial station would use but it might be good
for amateur sky-wave DX.
Have the USA Lowfers tried this one out?

Regards,
Peter, G3LDO

e-mail <[email protected]>

Web <http://web.ukonline.co.uk/g3ldo>





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