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

[VIGILANT Luis Fernández <luis@vigilant.es>]

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

EA5DOM

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De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] en nombre de IK1WVQ Mauro [ik1wvq@stmb.it]
Enviado: jueves, 30 de abril de 2015 23:16
Para: rsgb_lf_group@blacksheep.org; rsgb_lf_group@blacksheep.org
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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