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  #1  
Old 09-13-2022, 06:08 AM
F1R F1R is offline
 
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Default Can Anyone Identify This EMI Source?

This is a short recording of a radio interference tone on 122.8 that has been an intermittent pain and distraction around the airport at CEQ3 for a number of years. Does anybody recognize the tone?

https://youtu.be/YtfD87eAoJo?t=5

A Rocket w/Garmin SL30 & GX60 , Lake 250 with 2 of Garmin XL 250 and a Chipmunk all get blasted with the same tone.
Sometimes on the apron and runway, sometimes in the air in close proximity to the airport.

Last edited by F1R : 09-14-2022 at 02:13 PM.
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  #2  
Old 09-13-2022, 06:51 AM
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rv8ch rv8ch is online now
 
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Default

Quote:
Originally Posted by F1R View Post
Moderators please delete this thread as I am un able to load the video with audio recording
Load it on youtube - which is free and easy - and paste in the link.
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  #3  
Old 09-13-2022, 07:19 AM
F1R F1R is offline
 
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Default Thanks

Quote:
Originally Posted by rv8ch View Post
Load it on youtube - which is free and easy - and paste in the link.
Thanks, hopefully somebody can narrow the search when they hear the recording.
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  #4  
Old 09-13-2022, 08:40 AM
moosepileit moosepileit is offline
 
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Location: Louisville, KY
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Default

Usually an MRI machine... But, that does not look near a medical facility.
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  #5  
Old 09-14-2022, 11:12 AM
F1R F1R is offline
 
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Default

The city is just off the LH wing a couple of miles. We have no MRI within 60 miles. In the foreground however is an almost new large pig farm.

In the city there are several pipe manufacturing facilities. Also pipe coating plants. Perhaps they have a high frequency welder that has un shielded wiring or a non enclosed power supply.
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  #6  
Old 09-14-2022, 11:24 AM
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fl-mike fl-mike is offline
 
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Default

Arc welders are giant spark gap transmitters. Very broadband.
Sounds like 60Hz ish modulation.
Take a handheld and drive near the plants (during operation)
Can you email the audio? I can take a look the spectrum.
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  #7  
Old 09-14-2022, 11:53 AM
Bo1000 Bo1000 is offline
 
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Location: Austin
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Default Numerous large welding operations nearby

Here's one just 2000ft from the airport. http://www.evrazna.com/LocationsFaci...75/Default.asp
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  #8  
Old 09-14-2022, 06:37 PM
Handclutch Handclutch is offline
 
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Location: Bendigo, Australia
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Possibly the pig farm. Pigs are susceptible to stray voltage/current. I was on a pig farm recently and saw the mitigation gear they use - quite sophisticated. I have no idea how it works or what it does but it was a significant installation. There was a unit in each barn.

Jack
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  #9  
Old 09-14-2022, 08:42 PM
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RV6_flyer RV6_flyer is offline
 
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Default

Quote:
Originally Posted by fl-mike View Post
Arc welders are giant spark gap transmitters. Very broadband.
Sounds like 60Hz ish modulation.
Take a handheld and drive near the plants (during operation)
Can you email the audio? I can take a look the spectrum.
There is an "add on" for Firefox (Video DownloadHelper) that will allow one to download and convert (for a fee) to MP3 HQ (256 KBPS). The file is 500K so it could be emailed. Send me a PM with your email address and I will send you the file.
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  #10  
Old 09-14-2022, 10:04 PM
Sam_B Sam_B is offline
 
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Location: Boyceville, Wi
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Default Iím curious

Quote:
Originally Posted by RV6_flyer View Post
There is an "add on" for Firefox (Video DownloadHelper) that will allow one to download and convert (for a fee) to MP3 HQ (256 KBPS). The file is 500K so it could be emailed. Send me a PM with your email address and I will send you the file.
Iím curious about this. Could you send me the mp3? I can run a Fourier Transform to get the peak frequencies up to 0.5 the sampling rate.

Thanks,
Sam
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