Message-ID: <37B2744D.810F6573@cableol.co.uk>
Date: Thu, 12 Aug 1999 08:14:21 +0100
From: "Steve Rawlings" <steve.rawlings@cableol.co.uk>
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: Correction to; Measurement of loop antenna current
References: <37B123A5.F924C09D@cableol.co.uk> <003e01bee437$206b7500$0200a8c0@test>
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Dave Brown ZL3FJ wrote:

> . . .   The 5 ohms rf resistance I quoted was the figure for the original
> single loop.  With conductor two conductors in parallel the
> figure is close to 1.25ohms.  Corresponding DC figure is just over 0.1 ohms.
> The present loop matching xfmr has a 13 turn (50 ohm) primary and 2 turns on
> the loop side secondary. Never been quite sure why it dropped to quarter of
> what it was originally rather than just half.  Anyone else had the same
> experience?

Many thanks for the information Dave.  I'll keep this in mind as I seek to
reduce my loop resistance from its present value of 1.7 ohms DC.   But now that
I know the magnitude of the RF current involved, I'm concerned that, once I have
reduced the losses, I will end up cooking the ATU tuning capacitors!

Electric field antennas present us with problems due to high voltage; and
magnetic field antennas present us with problems due to high current.  It's all
part of the fun, I guess . . . .

Regards to all,
Steve GW4ALG
steve.rawlings@cableol.co.uk