4 ms·
Do you have any reading material about this? Intriguing concept.
by humanizersequel 4y ago
Do you have any reading material about this? Intriguing concept.
- retrac 4y agoThe ham radio folks have a hobby called QRP / QRS. Low-power operation. I think the idea is to go the farthest, the slowest, with the least power. The WSPR project uses low-power beacons to study radio propagation: https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software) https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software) You can buy kits that transmit beacons quite a ways for like $50. Or build one from a few parts in the bin and a microcontroller with GPIO pins. Need a licence for any real output power, of course. On LoRa networks: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7435450/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7435450/ And an open-source implementation of one: https://meshtastic.org/ https://meshtastic.org/ LoRa gives several kilometres, practically, in an urban area, with a little coil of wire as an antenna. It uses unlicensed spectrum at legal power limits. It will go much further if given decent antennas and if raised up in a good location. LoRa modules are $10 - $20. A brick-sized box, on top of a tall building, or a pole on a hill. It's standard mesh networking, just quite slow, low power, and long-range. As for SDR: https://wiki.gnuradio.org/index.php/SuggestedReading https://wiki.gnuradio.org/index.php/SuggestedReading