Interference - looking for next steps
#1
Question 
Hello everyone,

I have a new BLUE system which I built last weekend. It works great some of the time. I can detect strokes that are over 1500-2000km away easily, and have a good stroke ratio when it works.

However, I have a noise problem (on H-field antennas, mostly E-W loop) that starts in the evening and runs through most of the night into the day. It puts my unit into interference mode. Even if I turn down the gain it does not help because  the spikes are so large. It's like someone turned on a switch or piece of equipment that starts the problem. I think the noise might be close by because I can see it on the E-field antenna too, but I could be wrong about that.

I'm looking for help in finding some posts here in the forum, or at other websites, on recommendations to start tracking down the location of this noise, and decide what nexts actions I should take.

Please see the attached images form the signal page, and other setup data. I can provide other information too if that will help.

I don't mind doing the work and learning new things, I just need a little help getting going. The information to help me might already be out there, but I'm not sure where to look.

Thank you for your time and your help!

Configuration:
  • Manual mode
  • 120mV threshold
My antenna setup:
  • H-field (Two 100cm loops at 90º)
  •   Gain: 16 x 8
  •   Noise: 15-25mVpp
  • E-field
  •   Gain: 10 x 4
  •   Noise: 39mVpp


Attached Files Thumbnail(s)
           
WU: KROCKF4 || CWOP: C9861 || CoCoRaHS: MI-KN-83 || Blitzotung: 1737
Davis Vantage Pro2 Plus --> Meteohub
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#2
http://www.wxforum.net/index.php?topic=20439.0
                   TwinHollies WeatherCenter  Frankfort KY, USA
  Americas Operators at Sferics.us
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#3
(2017-03-29, 02:20)Cutty Wrote: http://www.wxforum.net/index.php?topic=20439.0


Thanks.


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#4
(2017-03-29, 01:33)cbhiii Wrote: However, I have a noise problem (on H-field antennas, mostly E-W loop) that starts in the evening and runs through most of the night into the day. It puts my unit into interference mode. 
  • Gain: 16 x 8
  • Noise: 15-25mVpp

Noise what niose? I'd love to have a noise floor that quiet! 10 * 10 or 10 * 8 (auto) total gain 4,000 or 3,200, noise 50 to 60 mVpp ... You have more gain and much lower noise...

I wonder what those little peaks are on the purple line? The big signal looks like a strike signal to me but I guess your are getting a constant stream of near identical ones rather than random different ones. What's the repetion rate?

BTW the loops don't have to be E-W N-S or even at 90 degrees. One of mine is aligned to reject as much as possible the stonkimg great signals from two VLF stations a few tens of miles away and only filtered to remove the time signal from MSF on 60 kHz. The other angled as far from the first and heavly filtered (17.3 kHz) so that its noise floor is about the same as the other. This means they are only 30 degress apart... Compromise but if I just put them up N-S/E-W all I'd get is the VLF stations and interference mode...
Cheers
Dave.

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