hi folks, thought i would try for compass-1. Had a good 81 degree pass my location just now and listened and got the last of a cw beacon as I think it goes/xmits every 8 mins. So to get a beacon is just a matter of luck if it beacons while over head. sounded powerfull though, will be looking for it the next pass's.
kc8gkf
p.s. had to change freq from 437.275 to 437.405 for the packet. wish they were on the same freq. guess I have to decide what one i want to try for. anyone know how they xmit us the pics? or if any pics have been downloaded as of yet?
Hi Jeff,
thank you for listening to COMPASS. Could you decode the beacon or did you record it?
COMPASS is in emergency mode and the beacon is transmitting every 8..9 minutes if the voltage is higher than 2.8 volts. The RX/TX seems to work with voltages down to 2.4 volt. This explains why COMPASS responds to commands but no beacon sends.
If the batteries are charged and the voltage is higher than 3.7 volts (!) - COMPASS will switch autonomous into NORMAL mode. Only in this mode the FM transmitter (437.405MHz) is on and the satellite can send packets on request.
To take a picture the following points must fulfilled: - NORMAL mode - ADCS active and in control mode - that means COMPASS is not tumbling and stabilized, camera is pointing to earth - COMPASS must command to take a picture - everyone :-) should listen to COMPASS and collect the received packets ( 300 Kbyte data ) - request the missing packet frames - compose the frames to an picture
But we are far away from this point. The first goal is - bring back COMPASS into normal operation mode.
Thanks and 73, Mike DK3WN
-----Ursprüngliche Nachricht----- Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im Auftrag von Mr Jeffrey L Ross Gesendet: Freitag, 22. August 2008 05:02 An: amsat Betreff: [amsat-bb] compass-1
hi folks, thought i would try for compass-1. Had a good 81 degree pass my location just now and listened and got the last of a cw beacon as I think it
goes/xmits every 8 mins. So to get a beacon is just a matter of luck if it beacons while over head. sounded powerfull though, will be looking for it the next pass's.
kc8gkf
p.s. had to change freq from 437.275 to 437.405 for the packet. wish they were on the same freq. guess I have to decide what one i want to try for. anyone know how they xmit us the pics? or if any pics have been downloaded as of yet?
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participants (2)
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Mike Rupprecht -
Mr Jeffrey L Ross