Scott,
How long have you been hearing this "main" noise ?
I have listened to the wave files again, and it still just
sounds like summertime storm noise.
I have been plaqued with different types of "electrical"
and line noise for many years, and this sounds nothing
like the wave files.
Do you hear the noise on 3.5 / 1.8 Mhz ? Even without a resonant
antenna on those bands you should still be able to hear it.
The summertime atmospheric noises typically are not heard
on the upper bands.
73, Tom K5IID
Tom Horton K5IID
Hillsboro, TX
USA-CA All Counties 661---DXCC---5 BAND DXCC
WPX HONOR ROLL---5 BAND WAC---WAZ
Finally back home in Texas after all these years!
"E" sorter for the ARRL W5 QSL bureau
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