Keyword "polytone"
1 sites have this keyword listed in their metadata, here's one you may hate:
Some more weirdo shortwave fax or digital data transmissions. Don't know what it is, just that it went from lower sideband to upper sideband, gave a polytone burst, transmitter stopped, then another polytone, and it went back to the data or fax
NA5B WebSDR, located in Washington, D.C..
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