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Topics - sky_listener

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I heard this mode on 3311 kHz USB, 01:40 UTC, Jan. 28 2021. My location is East Coast US. It seemed to use multiple different modes including MFSK, and it was heard several times during a net (primarily USB voice) whose callsigns sounded like Navy MARS. It sounded as if they were testing equipment, so could this mode be new?

A link to a sound file is attached. Thanks for the help!

https://drive.google.com/file/d/1N_0eqJp7IcI-knOdowAvQsLU12MJOBrV/view

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