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LCN #522 at 864.050 MHz on the San Diego City TRS has a sound unlike the other frequencies.
In the background of every call assigned to this channel there is a strong whistling/warbling signal. I've heard it on my Uniden, and on Mot radios as well.
I thought it might be interference, but there is a predictable 'data' sound to the whistle that changes near the end of the call. I could be fooling myself.
The sound is not subtle, and the same radios on different channels don't exhibit it.
Any ideas what this is from?
In the background of every call assigned to this channel there is a strong whistling/warbling signal. I've heard it on my Uniden, and on Mot radios as well.
I thought it might be interference, but there is a predictable 'data' sound to the whistle that changes near the end of the call. I could be fooling myself.
The sound is not subtle, and the same radios on different channels don't exhibit it.
Any ideas what this is from?