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Old 09-15-2022, 11:19 AM
fl-mike's Avatar
fl-mike fl-mike is offline
Join Date: Jul 2005
Posts: 1,808

Looking at the spectragram, it looks like 3-phase 60Hz pulse modulations (the black dots in the spectragram) spread across some harmonics in the audio band.

I'm still guessing some big honkin' industrial welder or similar.

I can get a deeper look once IT gets my good audio analysis SW with 3D spectragrams installed on my new laptop. This is from freeware Audacity:
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Mike W
Venice, FL

N164WM RV-6A Slider/O-360/FP Sold 4/2022
N184WM (RV-8) Ready for inspection. Titan IOX-370/ CS/G3X
N184P reserved (RV-8QB) Empennage kit and QB wings in the shop
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Old 09-15-2022, 01:46 PM
F1R F1R is offline
Join Date: Nov 2010
Location: ____
Posts: 944

Thanks Mike,

That is greatly appreciated. There are currently a few professionals involved in the hunt which is looking at several possible sources. Presently the on airport suspect is the Constant Current Regulator for the rwy lights. It may proceed to surrounding area equipment. So far it has not been able to be heard with a hand held VHF radio. Only the 3 ships previously mentioned.

The next few weeks will hopefully find the source and cure the problem.
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