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IIRC from my drone days, the antennas were spiral (not linear) for FPOV flight on the 2.4Ghz or 5Ghz spectrum. This a) basically prevented interference from WiF
by withinboredom 5y ago
IIRC from my drone days, the antennas were spiral (not linear) for FPOV flight on the 2.4Ghz or 5Ghz spectrum. This a) basically prevented interference from WiFi and b) gave good clean LOS signals for miles. There was still interference, but it wasn’t bad. In Afghanistan (where there were basically no competing WiFi signals) I could get consumer WiFi to go about 2km LOS on the 2.4Ghz bands.
- exikyut 5y agoVery interesting. IIUC, the spiral antennas were... polarizing the signal, such that the Wi-Fi antennas couldn't "see" it, I think? I'm curious how big the antennas (and effective output power) was in Afghanistan. That's pretty cool. I can't figure out what regulatory domain they're in, I wonder if they have one lol...
- withinboredom 5y agoIn Afghanistan, I used an old fashioned DDWRT router with the transmission power turned up to 125milliwatts IIRC? No special antennas like a high gain one. The distance was a backhaul link between routers so we could have civilian internet at the office. There was no regulatory domain other than not interfering with the signals guys or messing up radar returns. My FPOV drone was in the 5Ghz band and I could go for about 1.5 miles before a tree limb would cause significant interference.