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Images are all in order, but some have missing packets.

The problem with SSTV is the power required. From some looking it seems that transmitting would need at least 5 watts. This wouldn't be feasible running on the balloon, as it was powered by Energizer Ultimate Lithium batteries.

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Oh, yeah FM transmitters can require a fair bit of power.

What is it using then, LoRA type stuff?

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Yep, the radio link runs LoRa on the 33 cm band (915 MHz)
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