To the ai: Approximate 915 MHz line-of-sight footprint:
Altitude
Ground horizon radius
480 km altitude= radius of ~2,480 km / ~1,540 mi
550 km altitude = radius ~2,650 km / ~1,650 mi
——that’s one fucking transmitter.
So a 915 MHz transmitter on a Starlink satellite could theoretically be heard over a circle roughly 3,000+ miles wide at a time, assuming enough power and antenna gain.
What if it’s a 5w transmitter? Bottom line: 5 W at 915 MHz from Starlink altitude could theoretically cover most/all of its visible footprint, but only with a suitable modulation, antenna, and receiver sensitivity.
Could the sat hear me down here?
From ~550 km altitude:
- A 100 mW (20 dBm) transmitter with a small antenna arrives at the satellite at roughly -126 dBm overhead.
- A 1 W (30 dBm) transmitter arrives around -116 dBm.
Those levels are detectable with a sensitive receiver, especially using narrowband or LoRa modulation and a high-gain antenna on the satellite.
Then it got into lots of chatter and collisions.
But it would be easy to make an internet bridge to get the signal to it and have it rebroadcast
So it’s plausable