OSCAR-1

OSCAR-1 was launched on December 12, 1961, as a secondary payload aboard a Thor-Agena rocket from Vandenberg Air Force Base in California. It hitchhiked alongside the primary payload, a U.S. military reconnaissance satellite called Discoverer 36. OSCAR-1 was built by amateur radio enthusiasts in the San Francisco Bay Area for approximately $60.

OSCAR-1 transmitted a simple Morse code beacon spelling 'HI' at approximately 144.983 MHz for about 22 days before its batteries were depleted. The satellite did not have solar panels and relied entirely on non-rechargeable batteries, limiting its operational lifetime. Over 500 amateur radio operators in 28 countries reportedly received the signal during those three weeks.

OSCAR-1 was built by a group of amateur radio enthusiasts organized under Project OSCAR, based in the San Francisco Bay Area. The project was led by individuals including Lance Ginner and Chuck Towns, who convinced the U.S. Air Force to carry their small satellite as a secondary payload. Project OSCAR later evolved into AMSAT (Radio Amateur Satellite Corporation), which continues building amateur satellites today.

OSCAR-1 proved that private citizens could design, build, and successfully operate a satellite, predating the modern CubeSat movement by decades. It was the first satellite built by non-government entities and demonstrated that amateur radio could work in space. The success led to a continuing series of OSCAR satellites, with over 80 amateur satellites launched since 1961.