GRBAlpha has a 9600 baud digipeater on 437.025 MHz for both uplink and downlink. I've sent packets through it, as have a few other people. My understanding is that it's not APRS per se, as it just repeats whatever it hears regardless of format, but it could certainly be used to make QSOs. I was only able to be repeated when the satellite was at high elevations.

-Stephen
N8URE

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