Telemetry
How we hear a satellite 40,000 km away.
Hearing 40,000 km away
Telemetry is the art of hearing a transmitter the size of a lunchbox from the distance of a full trip around the earth. We do it every day, in real time.
How a link works
uplink commands, low rate, always on downlink housekeeping + payload data doppler the shift that tells us the orbit lock a carrier we hold for the whole pass
The quiet miracle
When you see a satellite's position on the map, that position was measured — not guessed — by a dish catching a signal across forty thousand kilometers of nothing.