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Off Frequency on 1290 - Update

A

audioguy

Well gentlemen; today I received a phone call from Sparta-Tomah broadcasting. They recently had their annual performance measurements done, and are operating on frequency within FCC limits. So apparently, they are not the ones at fault.

The problem persists. Do you gentlemen have any other suggestions? This could not be coming from Central/South America, could it? I think we came to the conclusion that the offending station is operating about 200-300 Hz low in frequency, if I remember correctly. The beat note seems to peak to N-S here in the Chicago area.
 
Perhaps try fmscan.org, click on MW, click on single frequency search. When is this occurring? I am 40 miles NW of Chicago and I don't hear the heterodyning during the day or night. Is this right around sunset or sunrise, when a daytime only station is about to leave/just came on the air?
 
The heterodyne was audible just about every night all summer long in the Chicago area and also in SW Michigan. It was reported here on an earlier thread by more than one observer. I heard it until about two weeks ago, when I went on a business trip to Europe. Just before I left, I sent a letter to Sparta-Tomah B/C. There was a message from them on my telephone answering machine when I returned home, stating that their testing service said they were on frequency. Interestingly, I have not heard the heterodyne since. Coincidence? or did they actually discover that they were off, and corrected the problem?!

I am going to continue to monitor occasionally to see if it comes back. If I hear it again, then it probably wasn't them.
 
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