Alan thanks - Im thinking cos the noise is "Whitish" is
nature that it could be high level iono - certainly I cant finger any of
the local QRM sources or attach it back to the house here either -
but the change has been dramatic - Im going to turn the loop (now
theres an idea!) and see what the deltas are into a
SPM30 and see ifs coming in from a azimuth source or
if it stays flatish perhaps I should as you say look up - the K is
elevated here at the moment too -
Yep we are frozen but not
to any great depth yet... maybe 10
cms
From:
[email protected]To:
[email protected]Date:
Mon, 15 Dec 2014 00:11:33 +0000
Subject: LF: Re: Noisy Earth
mat...?
Hi Laurence.....a bit odd ?? I presume your
ground is frozen hard now so winter ground loss. Just a silly thought I wonder
because a lot of your noise is from 30 to 50km if the mat is reflecting noise
into your loop that would in another position be absorbed in the ground ??
Then again I am used to fence wire being steel or maybe coated iron
.....magnetic conversion rather than rectification, (never quite understood
how Marconi's wire detector worked) ?? ;-)) or is your neighbour using it
as one electrode of his Christmas lights ?
Best Wishes for the holiday
Alan
G3NYK
-----
Original Message -----
Sent:
Sunday, December 14, 2014 11:53 PM
Subject:
LF: Noisy Earth mat...?
It so happens my 10ft diameter multi turn LF loop is now
plonked in the centre of an extensive earth mat consisting of bonded
welded fence wire, and about 100 x 100ft radials, numerous Earth
rods etc part of the MF tx system - Cant detect any diode type effects from
the mat....
Ive noticed since the loop has been surrounded by
this "mat" the induced noise into the loop has increased and the
loop effectiveness at 137kHz has been severely compromised
(about 5dB on Transpolar paths over an optimized positional L400B) -
the mat and the loop are above 2.5 metres apart and not electrically
connected (galvanically isolated) with common mode chokes on the 400
coax - there is no local coupling from the MF Marconi ie I can
short it to ground or bring it down and the background noise (somewhat White
in nature around -95dBm) doesn't change....
So I just wondered
if I should move my loop to a new Green field location away from the radial
mat etc - anyone else noticed similar?? Any
suggestions?
Thanks
Laurence KL7L et al
ps over the pole
is poor this evening so far with a little
spreading...
