Decode LoRa satellites with an SDR

Group

Satellite & navigation

In the mode list

Satellites, 436 / 868 MHz

What LoRa satellites is

LoRa from satellites and space gateway services on 400 - 440 MHz and 868 / 915 MHz: the LoRa decoder with a Doppler-wide channel filter that follows the carrier through every frame (shift of up to +-10 kHz at 436 MHz and +-20 kHz at 868 MHz, rate of up to 150 - 300 Hz/s), a Doppler curve of the pass drawn from the frames, public presets (unverified) and the pass planner naming the satellite.….

Frequencies and settings

OnAir takes any frequency you type; the numbers above are the mode's starting point and the range its table describes. In the app the shortcut label is Satellites, 436 / 868 MHz.

What OnAir shows

LoRa from satellites and space gateway services on 400 - 440 MHz and 868 / 915 MHz: the LoRa decoder with a Doppler-wide channel filter that follows the carrier through every frame (shift of up to +-10 kHz at 436 MHz and +-20 kHz at 868 MHz, rate of up to 150 - 300 Hz/s), a Doppler curve of the pass drawn from the frames, public presets (unverified) and the pass planner naming the satellite. Receive only.

Limits and what it was checked with

Checked with generated signals and impairments; recordings of real signals welcome.

Which radio you need

This is a shortwave mode, so the radio has to tune HF. An SDRplay, Airspy HF+ or an RTL-SDR in direct-sampling mode do that directly; with a HackRF an HF upconverter or a direct-sampling receiver is the usual route. A long wire or loop antenna matters more than the radio.

Receiving and the law

Questions about LoRa satellites

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