Bouncing LoRa Signals Off the Moon [video]

Re:Bouncing LoRa Signals Off the Moon [video] by ale42 on Friday May 05, 2023 @10:06AM (#35829390)

I was hoping for some QRP (low-power) transmissions... but not. I just looked quickly at the video, but as far as I understand they used 500 W of output power and 8-m dishes. People are doing EME (bouncing signals on the moon) on the same frequency with as low as 5 W of power and a 1.5m dish (see https://hb9q.ch/2018/?page_id=37).

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Re:Bouncing LoRa Signals Off the Moon [video] by SPACE_LAWYER on Friday May 05, 2023 @10:38AM (#35829802)

qrp off the moon @ the path loss is insane

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Re:Bouncing LoRa Signals Off the Moon [video] by ale42 on Friday May 05, 2023 @11:06AM (#35830167)

It definitely is... but people do it!

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Re:Bouncing LoRa Signals Off the Moon [video] by 1024core on Friday May 05, 2023 @11:26AM (#35830476)

But these are college kids. Cut them some slack.

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Re:Bouncing LoRa Signals Off the Moon [video] by jaywalk on Friday May 05, 2023 @12:03PM (#35831134)

They haven't even sent any signals yet. They got as far as using a spectrum analyzer to verify they're outputting on the correct frequency.

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Re:Bouncing LoRa Signals Off the Moon [video] by drmpeg on Friday May 05, 2023 @01:44PM (#35832670)

Apples and oranges. Those numbers are for a 50 Hz bandwidth mode. LoRa is 125 kHz, so it has a 34 dB disadvantage.

Also, those numbers require the HB9Q 50 foot dish to be at the other end.

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