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RE: LF: vlf stuff

from [Laurence KL1X] [Permanent Link][Original]
To: <[email protected]>
Subject: RE: LF: vlf stuff
From: Laurence KL1X <[email protected]>
Date: Thu, 22 Apr 2010 07:09:03 -0800
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Stefan, Xtain, Danielle, Bob - thanks for the comments -
 
On the QRM from the PC - no I dont get any (problematic) unless the loop is within 3 metres or so of the loop - I have a 15m length of RG58 50 ohm coax to the loop and the background iono/qrn masks any noise that I comes from the unit - Ill take some screen shots and publish.
 
Even some 400m from the nearest power line I can see 60Hz harmonics and some PLC stuff so Ill have to go out into the Plains a bit further.
 
The aim perhaps is to look for W1VLF or other signals (yourselves) sometime in the future -
 
I did some VLF receiving stuff is Asia Pacfic countries over the past few years - an example from China http://kl1x.com/vlfchina.jpg  and from the Polar regions some 30 years ago.
 
 
I didnt get a lot of time last night as I was getting bitten by mosquitoes and was wearing short trousers but we had thunderstorms to our West which spoilt any long distance reception -so much so that Alphas werent visible - The normal US and some other VLF stations were good enough. Ill wait for a quieter time and smother myself with "bug dope" but the loop/preamp was producing good results (its very very quiet) -
 
 I used the loop right next to the Television to calibrate the receiver looking at the sync but I need to revisit this given some of the comments about digital TV's.
 
Laurence KL 1 X in 5
bartlesville OK
http://kl1x.com

 

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