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LF: Re: questions about a tx square loop fpr 470KHz

To: "[email protected]" <[email protected]>
Subject: LF: Re: questions about a tx square loop fpr 470KHz
From: VIGILANT Luis Fernández <[email protected]>
Date: Fri, 1 May 2015 11:03:24 +0000
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Thread-topic: questions about a tx square loop fpr 470KHz
Ciao Sandro

I'm not an expert at all, but as there is no answer from others and after seeing your picture
I would not make a vertical loop that way. In my opinion it will be too close to the terrace floor
and the rest of the building

What I have done is a horizontal loop and it works. If you can place 4 poles in the corners of the
building shown in your picture (40mm plastic pipe 1,5m high) then you should get a bigger loop
More than one turn can be better, or at least that's what I have read but not tested
Using the four corners of the buiding may be you can get 7m x 7m loop, and if you make 2 turns
vertically spaced may be you can get something working on 477KHz ???

6mm copper wire can be too heavy and expensive. I used RG59 coax and it works. Cheap and light

I prefer to spend the money in good capacitors

That's my two cents ! ;-)

73 de Luis

De: [email protected] [[email protected]] en nombre de IK1WVQ Mauro [[email protected]]
Enviado: jueves, 30 de abril de 2015 23:16
Para: [email protected]; [email protected]
Asunto: LF: questions about a tx square loop fpr 470KHz

73 to all,

I would like to know your opinion about this:

I can made a square TX loop for 470KHz of 7 * 3 meters (see picture) in the terrace of the building where I live (6 floors).

the questions are:

- it is enough a 6mmq copper electric wire ??  (20W is the output power of my tx).
- single turn or two turns spaced 10cm max ?? (two turns =  less pF required to take the resonance).
- Is this a good idea to start to trasmit on 470KHz WSPR ??

thanks in advance for your attention.

73 de Mauro IK1WVQ

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