RE: LF: Re: Noisy Earth mat...?

[Laurence KL7 L <hellozerohellozero@hotmail.com>]

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 W@G 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
 
thanks
Laurence
 

---

From: alan.melia@btinternet.com
To: rsgb_lf_group@blacksheep.org
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 -----

From: Laurence KL7 L

To: rsgb_lf_group@blacksheep.org

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...