The last couple of passes that I have tried seemed to start well - I hear stations using the repeater - but then some sort of digital signal takes over and no other voice activity is heard. Is this some command work being done by the ground controllers?
Thanks
Bob, WA9JDR
During the first and last minutes of a pass over North America, AO-27 is in Digital Mode; all you will hear is packet. In-between is when the AO-27 is in Analog FM mode. Check out http://www.ao27.org for more information.
73, John W9EN DM13LE [email protected]
On Aug 10, 2010, at 6:40 AM, Bob Schmidt wrote:
The last couple of passes that I have tried seemed to start well - I hear stations using the repeater - but then some sort of digital signal takes over and no other voice activity is heard. Is this some command work being done by the ground controllers?
Thanks
Bob, WA9JDR
Sent via [email protected]. 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
Hi Bob,
I think you are new to the satellites, since I haven't heard you on the birds yet. Welcome to the fun world of sat's.
Now to your question. AO-27 is on a timer sequence, 20 seconds of digital - then 7 minutes of voice - then back to 1 full minute of digital - then off.
You may be hearing it switch back to digital mode at the end of the 7 minute repeater mode. Just my guess. There are a number of sites that give you the times for the daily passes. One of them, http://www.ao27.org/AO27/listing.shtml is currently about ten minutes off. (late) Another one you may want to check out is http://sites.google.com/site/ao27satellitescheduler/ a program you can download and use on the daily bases.
I hope this helps and we all will look for you in the future.
73, Rick WA4NVM
The last couple of passes that I have tried seemed to start well - I hear stations using the repeater - but then some sort of digital signal takes over and no other voice activity is heard. Is this some command work being done by the ground controllers?
Thanks
Bob, WA9JDR
Sent via [email protected]. 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
Bob,
That is normal. The voice period is bracketed with telemetry bursts. It is all done by timer.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bob Schmidt Sent: Tuesday, August 10, 2010 8:40 AM To: [email protected] Subject: [amsat-bb] AO-27
The last couple of passes that I have tried seemed to start well - I hear stations using the repeater - but then some sort of digital signal takes over and no other voice activity is heard. Is this some command work being done by the ground controllers?
Thanks
Bob, WA9JDR
_______________________________________________ Sent via [email protected]. 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 (4)
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Alan P. Biddle -
Bob Schmidt -
John Belstner -
Rick - WA4NVM