2 ms·
Not at 900MHz. Skywave propagation mode is only available under about 30MHz. Above that, the signal reliably continues on into space. At frequencies this high,
by bigfatkitten 1y ago
Not at 900MHz. Skywave propagation mode is only available under about 30MHz. Above that, the signal reliably continues on into space.
At frequencies this high, you’re realistically limited to near line of sight paths.
- embedding-shape 1y ago> Not at 900MHz Shame, but at least now I understand why, thanks :) > you’re realistically limited to near line of sight paths Wonder exactly how far one would be able to get up to reach 1,000km line of sight, assuming you put both points equally far up. Guessing it's the curvature of the earth that gets in the way at that distance?
- bigfatkitten 1y agoYep. There are cubesats running LoRa payloads in low earth orbit[0], and between mountaintops, terrestrial paths of hundreds of km are possible[1]. [0] https://www.hackster.io/news/fossasat-1-an-open-source-satellite-for-the-internet-of-things-7f31cab00ef5 https://www.hackster.io/news/fossasat-1-an-open-source-satel... [1] https://meshtastic.org/docs/overview/range-tests/ https://meshtastic.org/docs/overview/range-tests/
- embedding-shape 1y ago> Using metal tape measures to build simple quarter-wave monopole antennas is a hack to that’s actually pretty common in the small satellite community This is just too crazy, thanks a lot for sharing these links! :)