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Date: Mon, 20 Aug 2007 23:10:27 +0100
From: Peter Dodd <g3ldo@ukonline.co.uk>
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Subject: LF: Low noise reception
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An article in the July/August edition of New Zealand magazine Break-In, 
by Don Collie, ZL4GX has an interesting article on a noise rejecting 
receiving loop, which covers 780kHz to 3200kHz. The loop comprises eight 
turns of 1mm wire close wound on a  340mm diameter former and tuned 
remotely with a BB212 varicap diode. So far nothing unusual there. What 
is different is that it it mounted horozontally in an old aluminium 
satelite dish. The quietness comes from the screening effect of the 
dish, provided it is placed high enough above the sources of electrical 
noise that causes most of the problems.
ZL4GX points out that shielding of the feedline and receiver (including 
mains shielding) is essential or some of the advantages of the antenna 
may be lost.
Does this arrangement have merit for 136kHz or 500kHz reception in 
locations having high levels of electrical noise?

Peter G3LDO