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Re: LF: Distance of LF vertical antenna element from lattice work steel

from [Alan Melia] [Permanent Link][Original]
To: <[email protected]>
Subject: Re: LF: Distance of LF vertical antenna element from lattice work steel mast?
From: "Alan Melia" <[email protected]>
Date: Fri, 21 Oct 2016 19:16:51 +0100
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Hi Chris another thought.... put some of the loading coil at the top of the tower, the trouble with this in your situation is that it stops you operating the aerial on other bands.
 
Look at it another way.....you want to avoid diverting current into the tower metalwork until it reaches the full height. It get less important as you go higher, so pull the loading coil 3metres of so away from the base of the tower and run the "vertical section" at an angle to the top of the tower. The tower should be grounded. Also keep it away from brickwork and/or foliage which can be lossy when wet.
 
Alan
G3NYK
----- Original Message -----
Sent: Friday, October 21, 2016 5:54 PM
Subject: Re: LF: Distance of LF vertical antenna element from lattice work steel mast?

Hi Chris,

 

to avoid issues with the mast you can either

 

- Feed the antenna at the top of the tower via an isolating tranformer.

The big disadvantage is that you will have to position the loading coil also at the top of the tower.

 

- Feed the antenna at ground level using a second wire to cancel out the effect of the tower.

 

Have a look here: http://www.strobbe.eu/on7yd/136ant/#Tower.

 

73, Rik  ON7YD - OR7T

 

Van: [email protected] <[email protected]> namens Markus Vester <[email protected]>
Verzonden: vrijdag 21 oktober 2016 18:00
Aan: [email protected]
Onderwerp: Re: LF: Distance of LF vertical antenna element from lattice work steel mast?
 
I'd suggest two to three meters.

73, Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: Chris Wilson <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 21 Okt 2016 4:03 pm
Betreff: LF: Distance of LF vertical antenna element from lattice work steel mast?

21 October 2016


Having improved the grounding here I now want to get at least the
lowest corner of my big horizontal roughly square wire loop up higher
than the apex of my bungalow it's currently tied to. The highest
nearest structure is my 40 foot wind up lattice work steel mast. It
would be most convenient to have the vertical element at this corner.
How far away from the steel mast should the vertical element be to not
have issues please? I strap the window line feeder at the base to form
the vertical so I can also use the horizontal loop on HF bands. Thanks



--


Best regards,
Chris 2E0ILY mailto:[email protected]

My part time LF grabber is at
http://www.chriswilson.tv/grabber.html


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