Re: Cal Poly's CP6 Satellite Launching May 5th
Cal Poly's next satellite, CP6, is scheduled to launch on May 5th between 20:00 and 23:00 EDT. Modulation: FSK (but uses LSB cheat to make AFSK) Radio Mode: LSB (neccesary for LSB cheat) Baud Rate: 1200 baud Beacon rate: 1 beacon every 2 minutes
I sure hope they have a true FSK demodulator, because trying to match almost 9000 Hz of Doppler in the blind to within 100 Hz or so to use AFSK for something that only lasts a second will be a real challenge....
But it is good to see something new in space!
Bob, WB4APR
Hi Bob,
I second your comments. Waiting 2 minutes for a 1 second burst is going to be a challenge indeed, even with computer controlled receiver tracking.
Jason, I trust you have the transmit sequence correct?? What's the planned Pout? What's the best link to tech details?
But we can always use a new challenge so the very best of luck to your team.
Regards...Bill - N6GHz
Bob Bruninga wrote:
Cal Poly's next satellite, CP6, is scheduled to launch on May 5th between 20:00 and 23:00 EDT. Modulation: FSK (but uses LSB cheat to make AFSK) Radio Mode: LSB (neccesary for LSB cheat) Baud Rate: 1200 baud Beacon rate: 1 beacon every 2 minutes
I sure hope they have a true FSK demodulator, because trying to match almost 9000 Hz of Doppler in the blind to within 100 Hz or so to use AFSK for something that only lasts a second will be a real challenge....
But it is good to see something new in space!
Bob, WB4APR
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
All,
yes it is a real challenge - but I heard many beacons from CP4 long time ago (sometimes in 5-minutes interval !)
The most important thing is to listen to CW header (6 seconds) - in this time you can adjust the frequency and catch the packet burst. I hope it's the same like CP4.... A running spectrum analyzer software is very helpful. So you can quickly adjust the frequency to the right value.
Some older CP4 reports on my website http://www.dk3wn.info/sat/afu/sat_cp.shtml It's in German but I think you can understand the way I went.
Another way is to record the beacon and then analyze the burst with MixW. There is an CUSTOM AFSK mode.
Keep my fingers crossed and best 73, Mike DK3WN
-----Ursprüngliche Nachricht----- Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im Auftrag von Bill Ress Gesendet: Sonntag, 3. Mai 2009 04:28 An: Bob Bruninga Cc: Jason Anderson; amsat-bb@amsat.org Betreff: [amsat-bb] Re: Cal Poly's CP6 Satellite Launching May 5th
Hi Bob,
I second your comments. Waiting 2 minutes for a 1 second burst is going to be a challenge indeed, even with computer controlled receiver tracking.
Jason, I trust you have the transmit sequence correct?? What's the planned Pout? What's the best link to tech details?
But we can always use a new challenge so the very best of luck to your team.
Regards...Bill - N6GHz
Bob Bruninga wrote:
Cal Poly's next satellite, CP6, is scheduled to launch on May 5th between 20:00 and 23:00 EDT. Modulation: FSK (but uses LSB cheat to make AFSK) Radio Mode: LSB (neccesary for LSB cheat) Baud Rate: 1200 baud Beacon rate: 1 beacon every 2 minutes
I sure hope they have a true FSK demodulator, because trying to match
almost 9000 Hz of Doppler in the blind to within 100 Hz or so to use AFSK for something that only lasts a second will be a real challenge....
But it is good to see something new in space!
Bob, WB4APR
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (3)
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Bill Ress -
Bob Bruninga -
Mike Rupprecht