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AM - Carrier "drift" caused by atmospheric conditions

kfbkfb

kfbkfb

KCMO AM 710 was off the air at night a few days ago, so I listened to part of Red Eye Radio on WLS AM 890 on a SONY CFD-S70 boombox radio.

Sometimes, the signal from WLS sounded like the carrier was a little offset, I've heard incorrectly decoded SSB radio audio a few times and WLS sounded like that, varying between normal and slightly garbled.

I've read some about AM broadcasting, but I haven't read anything about the AM carrier frequency being modified by atmospheric conditions during long distance reception, does that happen?


Kirk Bayne
 
That effect might be caused by "selective fading," where the amplitude and/or phase relationships of the AM carrier and its sidebands do not change identically, over time.
 
It can also be caused by ground wave and sky wave arriving at slightly different times and you get sort of a phasing sound where one path cancels out the other.
 
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