Weather Station Hardware > Blitzortung
Interference and Noise
Cutty Sark Sailor:
--- Quote from: i_fiorentino on October 10, 2013, 02:59:12 PM ---Wow Mike, thanks for sharing this!
Please, Could you give me an eye to my signal to verify if it's apparently ok?
Here it is: https://www.dropbox.com/s/9gikltg3lpj6383/Signal1.PNG
I also posted the image below.....what meaning this message near the captured strike?
https://www.dropbox.com/s/3vixc4afjizu6ie/Strikes.PNG
Many thanks,
Alessandro
--- End quote ---
I don't know for sure, Alessandro, those signals look pretty clean... for the error message, you might check the 'settings' 'sampling' for 'tracker'...
the settings should be 512 128 and some percentage... mine's set for 30%, and under 'A/D Converter' 56 28 12bits and 2. That might be what's happening.
Mike
Cutty Sark Sailor:
--- Quote from: Timay on October 10, 2013, 02:49:48 PM ---Take a shot of the signal after someone turns on a plasma TV...I think you will be amazed. I had a plasma TV for about a week and then took it back. When the TV was on, it completely wiped out my HF ham radio.
Tim
--- End quote ---
Yeah, Tim. I had a recent spurt of interference that looked very similar to the computer interference. I think was about 55-56Khz. Neighbor next door had just moved their big plasma to an outside wall, facing my garage. Negotiated a slight movement of the TV to the corner of their room, now minimal interference, but still some on rare occasions.
NeverDie:
--- Quote from: Cutty Sark Sailor on October 10, 2013, 02:15:27 PM ---'Interference': Any undesired signal that tends to interfere with reception.
I thought it time to start a thread that brings all our noise knowledge into one place, especially to help those living with frustration and those who may be less experienced and knowledgeable. Perhaps we could bring our troubleshooting, isolating, and resolution tips here, along with any screen captures we might grab.
We all want the clearest signal at the maximum distance that supports the network, and - for myself - there is some 'pride' and curiosity involved. We have healthy servings of those, or we wouldn't get involved it this! Contra-wise, we also want to avoid hindering the network efficiency by ignoring 'nearby' signals... especially as more stations come online in the USA. Our 'long range' capability becomes less a factor, and clean signals become more important... not ignoring the heavier load on the servers due to mucho 'noise' signals.
The first phase would be to identify, if we can, the type and source of interference. And that becomes quite a chore sometimes.
I'll kick it off with the following posts....
Mike
Links to explore:
http://radiojayallen.com/combatting-am-and-sw-interference/ A thorough, simple look-see, although aimed at AM broadcast, it's very applicable, and not technical.
--- End quote ---
Thanks for the helpful info. What is it that you're using to capture the signals and make those nice signal and noise graphs?
Cutty Sark Sailor:
I posted a link, and guess we can post more, to a page regarding intereference... maybe move all the links to the first post as you post 'em. Anyway, he mentions building structure, and discusses the blocking of signals.
I have the opposite issue in this dwelling. The home is covered with (real) foil covered insulation. The encapsulation seems to act as a 're-radiator' for noise... matter of fact, I've only found one 'sweet spot' in the garage where the generated fields are weakest... and one spot only!...
A few weeks ago, I rolled up a couple of 300mm ferrites per Don F's 250mm design, and replaced my 120mm, shielded kit ferrites with them. Possibly because of the increased gain, this longer pair has a better S/N than the 120s overall. And they perform better unshielded.
Antenna type, placement and orientation is important for some types of interference. For e.g. If I only had one source of street light interference, instead of three right now, with this TOA system not directionally critical, I could 'null' one antenna by pointing its 'core' end directly toward the light. However, with the current trinary source and the radiating home shell, that has very little effect. The stronger fields are pretty much detected from 'all directions'.
Cutty Sark Sailor:
--- Quote from: NeverDie on October 10, 2013, 05:02:31 PM ---What is it that you're using to capture the signals and make those nice signal and noise graphs?
--- End quote ---
Those are just screen captures of the signals display of the web interface for the Blitzortung controller. Nothing dramatic or fancy at all.
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