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LF: Re: Re. Pre-amps

To: [email protected]
Subject: LF: Re: Re. Pre-amps
From: "g3ldo" <[email protected]>
Date: Fri, 27 Apr 2001 13:00:33 +0100
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Many thanks to everone who responded to my comments on pre-amps and loops.I
am still not certain what to do-but at least have some more ideas. I hope
that the >resulting discussion was of general intrest.  73s Laurie.

Hi Laurie,
I have made a number of LF loops and have not had much luck with pre-amps;
they all seemed a bit noisy or I found there were lots of signals around
that shouldn't be there. I found the best loop is the 2m square one that is
described on my web site, wound with Litz wire and without an amplifier.

I confirm that the loop characteristics are very much modified by the nearby
resonant LF transmitting antenna and the fix is to detune the Tx antenna on

It is also a good idea to detune the receive loop on transmit!

Peter, G3LDO

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