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On October 4, 1957, at 07:28PM GMT, the Soviet Union successfully lunched SPUTNIK 1.
The world's first man-made artificial satellite.
Sputnik 1 was about the size of basketball, weighed only 84 kilogram, sphere about 0.6 meters in diameter.
It tooks about 98 minutes to orbit the Earth on its elliptical path. Sputnik 1 enters orbit, opened the Space Age.
Here is the file with recorded sound from SPUTNIK 1.
More technical details about Sputnik 1 you may find on the Web Page of RussianSpaceWeb.Com
To commemorate this fact a special event station 3Z50SPU was established by Polish ham radio operator Roman SQ2RH. That event station was on the air for a month starting on the 4th of October 2007. A special QSL card (as above) was available after end the event for all HAMs and SWLs who made QSOs or SWLs with a special event station 3Z50SPU.
You are welcome.
Other amateur special event stations celebrated the 50th Anniversary of SPUTNIK 1 and the 50th Anniversary of the Space were:
UP50SAT QSL via RN3ADS
4U50SPACE QSL via HB9BOU
GB5OSO operated by John G7HIA and Robert G8ATE
HB9SPACE just till 10 of October
On 14 of October 2007 at 13:10 UTC the two way QSO on 20m SSB was made between 3Z50SPU and GB5OSO.
From 04/10/2007 till 31/10/2007 the 3Z50SPU special event station worked 686 QSOs with 45 DXCC on 6 bands and 4 modes.