'Vario' Airplane Data Controller

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"Vario" Glider/Model airplane data controller
Altitude.jpg
Frequencies 462.61 MHz,462.725 MHz
Frequency Range 462.61 MHz - 462.725 MHz
Mode NFM
Modulation Voice and Data
ACF
Bandwidth 6 kHz
Location United States
Short Description This transmitter is found within the UHF FMRS bands, most likely used at airshows to give off barometric pressure, height in altitude represented by a voice, including various tones representing how high/how low the model plane is in the air.
I/Q Raw Recording
Audio Sample

The altitude never got above 2500 feet and the signal lasted about 20 minutes. Heard this several times over a 4 day period. Possible FLARM hooked up to a drone???