Stig Östlund

torsdag, april 01, 2010

Amateur Radio satellite Oscar 11

OSCAR-11 achieved 26 years in orbit on 01 March! It was designed, built and launched within a period of six months, using commercially available 'off the shelf' components (COTS).
Once again, congratulations to Professor Sir Martin Sweeting (callsignG3YJO) his team at the University of Surrey and groups of radio amateurs who also contributed to the project. Unfortunately, the satellite wasn't transmitting on its birthday, but was heard briefly, three days later.---The satellite transmits on 145.826 MHz., set receiver to NBFM. OSCAR-11 has a characteristic sound, rather like raspy slow morse code, sending "di di dah dah dah dah dah dah dah" sent over a period of five seconds. If you are receiving a very weak signal, switch the receiver to CW or SSB. You should hear several sidebands around the carrier frequency and should be able to hear the characteristic 'Morse code like' sound on at least one sideband.---
If you need to know what OSCAR-11 sounds like, there is an audio clip on my website which may be useful for identification and as a test signal for decoding. Varning: inget skönt ljud för icke-radioamatörer:
http://www.g3cwv.co.uk/980214t.wav

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