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What is the definition of the different values for sat_mode?

HV
HU
VU
VL
VS
UV
UL
US
SX

Guessing it has to do with the TX/RX bands, but not sure.

Thanks, Jim - KK7A

It must be a mystery.

Not seeing it in the documentation and general Internet searches don't talk much about it either.

See Mode designators: https://en.wikipedia.org/wiki/Amateur_radio_satellite