Amateur radio satellite
The first amateur radio satellite was OSCAR-1, launched on December 12, 1961, in the United States.
Other programs besides OSCAR have included Iskra (Soviet Union), RS (Soviet Union and Russia) and CubeSats.
The first amateur satellites contained telemetry beacons. Since 1965, most satellites carry a linear transponder for two-way communications in real time. Some satellites have a bulletin board for store-and-forward digital communications, or a digipeater for direct packet radio connections.
- Martin Davidoff: The Radio Amateur’s Satellite Handbook. The American Radio Relay League, Newington, ISBN 978-0-87259-658-0.
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