3 ms·
Bouncing LoRa Signals Off the Moon [video]
- ale42 4y agoI 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 https://hb9q.ch/2018/?page_id=37).
- SPACE_LAWYER 4y agoqrp off the moon @ the path loss is insane
- ale42 4y agoIt definitely is... but people do it!
- 1024core 4y agoBut these are college kids. Cut them some slack.
- jaywalk 4y agoThey 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.
- drmpeg 4y agoApples 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.
- politician 4y agoLoRa (long range radio) is different from LoRA (low rank adaptation of LLMs). Don't upvote this, it's just an annotation for HN to disambiguate two currently popular concepts.
- geuis 4y agoI had to look up the definition of the acronym to be sure. "LoRa" as a term is definitely over subscribed.
- MilStdJunkie 4y agoDon't forget Level Of Repair Analysis https://en.wikipedia.org/wiki/Level_of_Repair_Analysis https://en.wikipedia.org/wiki/Level_of_Repair_Analysis
- appleaday1 4y agohttps://www.nasa.gov/directorates/heo/scan/engineering/technology/disruption_tolerant_networking_overview https://www.nasa.gov/directorates/heo/scan/engineering/techn...
- drmpeg 4y agoTheir advisor is Al Katz, K2UYH whose been doing EME for as long as I can remember.