Hi Peter this is not unusual!! I suspect that you need to isolate the loop
feed with a small transformer. It is possible that the feed from the loop is
acting as a wire aerial and is conducting TV RFI and noises from the house
back to the loop. One quick check is to see how sharp the null on the loop
is when it is turned. If all the signal is being picked up by the loop the
null will be sharp and symmetrical. irun a 1.2 m loop with about 16t, which
will receive anyting I can hear on the 60m top Marconi at 12m high.....even
with the loop indoors, but I must then be carefull to switch off
interference sources. When using the loop, you must also disconnect or at
least detune the Marconi, because it will couple signals from all directions
into the loop.
73 de Alan G3NYK
[email protected]
http://www.alan.melia.btinternet.co.uk
----- Original Message -----
From: "dj9dw" <[email protected]>
To: <[email protected]>
Sent: 27 April 2003 09:07
Subject: LF: RX-LOOP
Hello LF-Group,
as a beginner, I built the loop that I found in df8zr´s homepage. 2m dia,
Q=200 seperate grounding 10m off the shack. I did not receive any statione
outside Germany. Too much noise by mains, TV etc. A small marconi, 10m
vertical and 2x10m on top, although fenced in by surroundings, works
satisfactory. I rx G3LDO barely aural to give one example. Facit: there
are
locations where a loop is pretty qualified to detect noisesources - and
nothing else.
vy 73 dj9dw, jo40le, nr Frankfurt, Peter.
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