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SOUTHERN AFRICAN AMATEUR RADIO SATELLITE ASSOCIATION (SA AMSAT)
Registered as a
non-profit organisation by the South African Department of Social
Development UPDATED 16 July 2010 |
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| BACAR ISS ECHO GAUTENG GROUP | |||
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SA AMSAT
SA AMSAT PAYLOAD ON SUMBANDILASAT
Listen to Dave Long ZS5FR's
Satellite Report on Amateur Radio Mirror
INTERNET STREAM Podcast: www.zs6ro.co.za/podcast
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SUMBANDILASAT RETURNS TO OPERATION SLOWLY 17 July 2010 times UTC South Africa Europe The ground control station will start slowly with the amateur payload and observe if the satellite remains stable and then gradually add more. With recent changes in software please note the following operating procedure. The PTT of the transmitter now STAYS ON for the duration of the payload activation (i.e. 15 min), regardless of a valid “transponder” tone received. Note that this does not get rid of the “cut-off” problem, nor of the requirement to embed a valid tone when you want to use the payload – see detailed explanation below. The following example depicts the ideal usage scenario of the payload: 1. As the satellite comes over the horizon, an unmodulated carrier (“quieting”) will be received by all on UHF 2. Person A starts to transmit on VHF (with valid “transponding” tone embedded in the transmission) and the transmission is relayed on UHF 3. When Person A releases his/her PTT, the satellite will continue to transmit what it is receiving (usually this will be “noise”) for a further ±3s. Nobody should start to transmit during this time! 4.0 At the end of the ±3s period, everybody will again hear the unmodulated carrier. 5. NB: only when this unmodulated carrier is heard should Person B start to transmit. Listen to this mp3 recording as an example of valid usage HERE In simple repeater operation terms , leave a 3 second gap between overs. SA AMSAT ELECTS OFFICE BEARERS
President
Vice President
Secretary/Treasurer
Technology Manager
SAARDT Representative
Regional Organisers SA
RADIO AMATEURS TO TAKE TECHNOLOGY INTO SPACE JOIN SA AMSAT NOW
Members also receive a membership certificate upon joining. If you are already a member and have not received a certificate please send your details to saamsat@intekom.co.za and a certificate will be mailed to you. To join, get all the details here
SATELLITES FOR BEGINNERS WITH
DAVE LONG ZS5FR Download the PowerPoint Presentation here in PDF Download article in word here Download audio presentation here
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NAME THE CUBESAT PROJECT SA AMSAT is inviting radio amateurs to propose a name for its CubeSat project. The project was announced at the recently held Space Symposium and will involve the design and construction of a CubeSat. A CubeSat is a 10 cm cube with a mass of up to 1 kg. The project name should be a single word in any of South Africa’s official languages and reflect the spirit of the project. A good example is the name given to the around the world balloon project which is called lalela, the Zulu word for listen.
Current and planned activity Currently operation is suspended. |
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