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From: "Bill Lewis"
Subject: Re: Coil antenna
Date: Wed, 18 Sep 2002 21:56:11 +0100
Organization: Kijoma Solutions Ltd
References: <firstname.lastname@example.org> <3D888614.email@example.com>
Reply-To: "Bill Lewis"
NNTP-Posting-Date: 18 Sep 2002 21:07:12 GMT
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i think he meant what does he wind it on..
try a ferrite rod as used in LW / MW radios.
a longwave coil is centered about 200kHz, you could resonate that at 25khz
with lots of Capacitance and you may
still be ok for your 3 Meter Range.
if not buy two or three LW coils, stick em on one rod and connect them in
series or wind your own to get sufficient inductance for a reasonably
efficient 25kHz antenna.
wire gauge will need to be thin unless you want a monster coil ;o
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"Rene Tschaggelar" wrote in message
> Coil material is copper.
> gauge is unimportant. Your signal is proportional to the
> enclosed area. And proportional to the number of turns.
> But the inductivity also rises, therefore a few tests
> are necessary.
> Ing.Buero R.Tschaggelar - http://www.ibrtses.com
> & commercial newsgroups - http://www.talkto.net
> Mmsya wrote:
> > Hello all,
> > Please help. I am trying to build an antenna made of a coil to receive
> > signal from a 25KHz. transmitter. I would like to have the coil to be as
> > as possible and to be able to receive the signal within 3 meter
> > have the following question:
> > a- What type of core material should I use for the inductor?
> > b- Is wire guage important?
> > Any other factor should I be concern?
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