ANDE is catching up to ISS. Now at about 0100z on the 5th, ANDE's footprint is just touching ISS's. And ISS is on packet on 145.825 just like ANDE.
Over the next several hours, ANDE will get closer to ISS and then move out in front.
I suspect that ISS has no chance at hearing the weak ande, and ANDE might not hear ISS, but the best chance will be monitoring ANDE's downlink for any double hop packets via ISS.
Since both spacecraft respond VIA ARISS, then a double hop packet might try the path UNPROTO APRS VIA ARISS,ARISS. A slightly more efficient path (shorter packet) might be APRS VIA WIDE2-2.
See the ANDE-OPS web page: http://www.ew.usna.edu/~bruninga/ande-ops.html
Good luck! Bob, WB4APR
Since ISS is unlikely to hear ANDE, why not be a bit more explicit and reduce the likelihood of the sats colliding with eachother (transmissions, not the sats themselves, hi)? I'd use a path of APRS via RS0ISS-4,ANDE-1.
-Joe, N8FQ
On Tue, 4 Dec 2007 20:48:31 -0500 "Robert Bruninga" bruninga@usna.edu wrote:
ANDE is catching up to ISS. Now at about 0100z on the 5th, ANDE's footprint is just touching ISS's. And ISS is on packet on 145.825 just like ANDE.
Over the next several hours, ANDE will get closer to ISS and then move out in front.
I suspect that ISS has no chance at hearing the weak ande, and ANDE might not hear ISS, but the best chance will be monitoring ANDE's downlink for any double hop packets via ISS.
Since both spacecraft respond VIA ARISS, then a double hop packet might try the path UNPROTO APRS VIA ARISS,ARISS. A slightly more efficient path (shorter packet) might be APRS VIA WIDE2-2.
See the ANDE-OPS web page: http://www.ew.usna.edu/~bruninga/ande-ops.html
Good luck! Bob, WB4APR
Since ISS is unlikely to hear ANDE, why not be a bit more explicit and reduce the likelihood of the sat's packets colliding with each other... I'd use a path of: APRS via RS0ISS-4,ANDE-1.
Thanks Joe. Yes, that is the best idea...
But come to think of it, ANDE does not have the best ears either... Oh well. Glad to hear ISS back up. Maybe if someone can catch PCSAT-1 on a mid day sunny pass and ISS, they might get a double hop...
Bob
Putting ISS first in the hop path seems to be the best strategy since ISS is above ANDE and the ISS antenna is Earth facing. Since ISS has a fairly high output, it is more likely to be heard by ANDE than the other way around. The draw back is that since ANDE is much harder to hear, one on the ground may not know if they had a successful hop through ANDE if no one hears the relayed packet.
Kenneth - N5VHO
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga Sent: Tuesday, December 04, 2007 9:25 PM To: 'Joe Veldhuis'; amsat-bb@amsat.org Subject: [amsat-bb] Re: ANDE - ISS dual hop?
Since ISS is unlikely to hear ANDE, why not be a bit more explicit and reduce the likelihood of the sat's packets colliding with each other... I'd use a path of: APRS via RS0ISS-4,ANDE-1.
Thanks Joe. Yes, that is the best idea...
But come to think of it, ANDE does not have the best ears either... Oh well. Glad to hear ISS back up. Maybe if someone can catch PCSAT-1 on a mid day sunny pass and ISS, they might get a double hop...
Bob
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Also the global APRS network that collects these packets and feeds the two pages: http://pcsat.aprs.org and http://www.ariss.net is an inherrently designed dupe eliminator. So if the packet is heard on the first hop, the second hop will be ignored as far as the FINDU.COM data base is concerned.
So you have to either parse the entire live APRS data stream for these packets, or look at your own TNC logs to see them.
Bob, WB4APR
-----Original Message----- From: Ransom, Kenneth G. (JSC-OC)[BAR] [mailto:kenneth.g.ransom@nasa.gov] Sent: Wednesday, December 05, 2007 11:11 AM To: bruninga@usna.edu; Joe Veldhuis; amsat-bb@amsat.org Subject: RE: [amsat-bb] Re: ANDE - ISS dual hop?
Putting ISS first in the hop path seems to be the best
strategy since
ISS is above ANDE and the ISS antenna is Earth facing. Since
ISS has a
fairly high output, it is more likely to be heard by ANDE than the other way around. The draw back is that since ANDE is much harder to hear, one on the ground may not know if they had a successful hop through ANDE if no one hears the relayed packet.
Kenneth - N5VHO
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga Sent: Tuesday, December 04, 2007 9:25 PM To: 'Joe Veldhuis'; amsat-bb@amsat.org Subject: [amsat-bb] Re: ANDE - ISS dual hop?
Since ISS is unlikely to hear ANDE, why not be a bit more explicit and reduce the likelihood of the sat's packets colliding with each other... I'd use a path of: APRS via RS0ISS-4,ANDE-1.
Thanks Joe. Yes, that is the best idea...
But come to think of it, ANDE does not have the best ears either... Oh well. Glad to hear ISS back up. Maybe if
someone
can catch PCSAT-1 on a mid day sunny pass and ISS, they might get a double hop...
Bob
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:
So if a packet is heard on the first hop, the second hop will be ignored as far as the FINDU.COM data base is concerned.
So you have to either parse the entire live APRS data stream for these packets, or look at your own TNC logs to see them.
OOPS, I was wrong on that sentence too. Since all the Igates feed APRSservers, and the servers also eliminate all dupes, then the only way to see a dual hop-packet is for someone to capture it in their local RF log or for the equally improbable occurrence that the first hop was not heard by ANY Igate anywhere. (the product of two unlikely events). So do not expect to find dual hops captured on any web pages except for local logs.
That's another reason I wanted a dedicated server just for SATgates...
Bob, WB4APR
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert
Bruninga
Sent: Wednesday, December 05, 2007 12:06 PM To: 'Ransom, Kenneth G. (JSC-OC)[BAR]'; 'Joe Veldhuis'; amsat-bb@amsat.org Subject: [amsat-bb] Re: ANDE - ISS dual hop?
Also the global APRS network that collects these packets and feeds the two pages: http://pcsat.aprs.org and http://www.ariss.net is an inherrently designed dupe
eliminator.
So if the packet is heard on the first hop, the second hop
will
be ignored as far as the FINDU.COM data base is concerned.
So you have to either parse the entire live APRS data stream
for
these packets, or look at your own TNC logs to see them.
Bob, WB4APR
-----Original Message----- From: Ransom, Kenneth G. (JSC-OC)[BAR] [mailto:kenneth.g.ransom@nasa.gov] Sent: Wednesday, December 05, 2007 11:11 AM To: bruninga@usna.edu; Joe Veldhuis; amsat-bb@amsat.org Subject: RE: [amsat-bb] Re: ANDE - ISS dual hop?
Putting ISS first in the hop path seems to be the best
strategy since
ISS is above ANDE and the ISS antenna is Earth facing. Since
ISS has a
fairly high output, it is more likely to be heard by ANDE than the other way around. The draw back is that since ANDE is much harder to hear, one on the ground may not know if they had a successful hop through ANDE if no one hears the relayed packet.
Kenneth - N5VHO
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga Sent: Tuesday, December 04, 2007 9:25 PM To: 'Joe Veldhuis'; amsat-bb@amsat.org Subject: [amsat-bb] Re: ANDE - ISS dual hop?
Since ISS is unlikely to hear ANDE, why not be a bit more explicit and reduce the likelihood of the sat's packets colliding with each other... I'd use a path of: APRS via RS0ISS-4,ANDE-1.
Thanks Joe. Yes, that is the best idea...
But come to think of it, ANDE does not have the best ears either... Oh well. Glad to hear ISS back up. Maybe if
someone
can catch PCSAT-1 on a mid day sunny pass and ISS, they
might
get a double hop...
Bob
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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:
Looking at the data from ANDE just now, ANDE has moved well ahead of the ISS. Their footprints no longer merge, at the moment.
73, Dave.
Looks like the next conjunctions will begin Dec 7 after 1400 UTC.
Kenneth - N5VHO
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Dave Aitch Sent: Wednesday, December 05, 2007 11:58 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: ANDE - ISS dual hop?
Looking at the data from ANDE just now, ANDE has moved well ahead of the ISS. Their footprints no longer merge, at the moment.
73, Dave.
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participants (4)
-
Dave Aitch -
Joe Veldhuis -
Ransom, Kenneth G. (JSC-OC)[BAR] -
Robert Bruninga