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| Subject: | LF: Low noise reception |
| From: | Peter Dodd <[email protected]> |
| Date: | Mon, 20 Aug 2007 23:10:27 +0100 |
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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 |
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