Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.



The OSCAR 3 (Orbiting Satellite Carrying Amateur Radio 3) was a rectangular spacecraft 20 × 30 cm with four monopole antennae. It contained a tracking beacon transmitter and a communications repeater. No active attitude control system was employed, and power was furnished by onboard batteries and solar cells.

It was launched piggyback with seven United States Air Force satellites. Weight 16.3 kg. It was the first amateur satellite to operate from solar power and relay signals from Earth. OSCAR 3 was the first true amateur satellite relaying voice contacts in the VHF 2 meter band through a 1 W 50 kHz wide linear transponder (146 MHz uplink and 144 MHz downlink).

OSCAR 3's transponder lasted 18 days. More than 1000 amateurs in 22 countries communicated through the linear transponder. The two beacon transmitters continued operating for several months.

Nation: USA
Type / Application: Amateur communication
Propulsion: None
Power: Solar cells, batteries
Mass: 13.6 kg
Satellite COSPAR Date LS Launch Vehicle Remarks
OSCAR 3 1965-016F 09.03.1965 Va 75-1-2 Thor-DM21 Agena-D with Poppy 4A (Solrad 7B), Poppy 4B, Poppy 4C (GGSE 2), Poppy 4D (GGSE 3), SECOR 3, Dodecapole 1, Surcal 4