Question / Help Audio buzzes and pops (putt putt putt ...)

[Charliebrm]

45 second audio sample MP3 linked.

My first day of attempts to record activity and OBS was easy to get working and does a great job BUT - I have this situation of repeating but random periods of a buzz of about a second followed by anywhere from 10s to 30s of putt putt putt ...
It sure sounds like the kind of buzz I'd expect from an analog phono cable with a short in it and the pops from interference. However, I get none of this leaving everything absolutely alone and recording with Audacity instead.

The signal chain is a Audio Technica $80 lavalier, into a small desktop 1/8" to USB convertor (the pass through of a Zoom H1), into a USB port on the case of the computer.

OBS settings are for Recording: High Quality, Medium File Size / Format: MP4 / Encoder: Software (x264)
OBS 24.0.1 - Windows 10 Home, i5-6600, 16 GB RAM, SSD system/program drive, saving to a 1 TB disk drive.

SAMPLE MP3

LOG FILE

 

[Narcogen]

Check that the mic and OBS are set for the same sample rate?

 

[Charliebrm]

For now I suspect it was outside interference. Since the first day, I've been recording over 50 minutes total in 8 clips averaging 5 minutes each. That first day I couldn't go half a minute before the noises showed up.
As to the question from Narcogen, both hardware and software are matched settings.

OBS is very easy to use immediately and get good results. I don't over think the settings, just see that my audio level is responding and hit Record. The mp4's are going into editing in Davinci Resolve anyway.