Hi All,
I just wonder how successful digi'ing via PCSAT using a TH-D7 has been? I have real trouble with 5watts and have yet to hit it successfully, 50watts yes, but i am sure thats not good. I believe that its down purely to usage here in Europe as she appears to get hit multiple time by the same stations?
Same as AO51 for example, its taken me a few passes to understand that multiple stations transmit at once and cause a strange clash, almost like you need to change freq.. but the signal strength is there!!
Maybe this stops the 5watt stations from actually being relayed??
Just a though and would be interested in your comments, does this happen so much in the US??
Thanks,
Chris Bloy
I wonder how successful digi'ing via PCSAT using a TH-D7 has been?
I believe that its down purely to usage here in Europe as she appears to get hit multiple times by the same stations?
Yes, we noticed that 2/3rds of all PCSAT-1 users are in Europe in a SMALL footprint. While in the USA, there are only half as many users but spread out over a much larger area. SO the congestion must be maybe 4 times worse over there in Europe..
Maybe this stops the 5watt stations from actually being relayed??
Yes, any collision will cause the weaker signal to not be heard. And then the stations just keep trying, further making the problem worse.
We need to find a way to cut back the throughput in Europe, because it is always over Europe that PCSAT-1 dies towards the end of its daylight period. We have asked all PCSAT-1 users to adhere to the User Service Agreement that was posted:
http://www.ew.usna.edu/~bruninga/pcsat/contract.txt
Which is posted on the PCSAT web page: http://www.ew.usna.edu/~bruninga/pcsat.html
Bob, WB4APR
Hi Bob,
Yes, we noticed that 2/3rds of all PCSAT-1 users are in Europe in a SMALL footprint. While in the USA, there are only half as many users but spread out over a much larger area. SO the congestion must be maybe 4 times worse over there in Europe..
I thought as much from looking at findu.com..
Yes, any collision will cause the weaker signal to not be heard. And then the stations just keep trying, further making the problem worse.
I don't know what to do about it, as even after I receive the bulletin of low usage and low sunlight the stations still flood in.. I have the same issue with ANDE and have to use high power to hit and digi too.
Its a shame as this will shorten the live of PCSAT for us all if sometime is not done... ISS I believe suffers from the above as I cannot hit that with a handheld either.. ALmost to the point of giving up. I will keep trying though as I would like to see my 5watt packets digi'd...
All the best, Chris
On 5 Nov 2007, at 20:41, Chris Bloy wrote:
Hi Bob,
Yes, we noticed that 2/3rds of all PCSAT-1 users are in Europe in a SMALL footprint. While in the USA, there are only half as many users but spread out over a much larger area. SO the congestion must be maybe 4 times worse over there in Europe..
I thought as much from looking at findu.com..
Yes, any collision will cause the weaker signal to not be heard. And then the stations just keep trying, further making the problem worse.
I don't know what to do about it, as even after I receive the bulletin of low usage and low sunlight the stations still flood in.. I have the same issue with ANDE and have to use high power to hit and digi too.
Its a shame as this will shorten the live of PCSAT for us all if sometime is not done... ISS I believe suffers from the above as I cannot hit that with a handheld either.. ALmost to the point of giving up. I will keep trying though as I would like to see my 5watt packets digi'd...
Its very difficult to get in at weekends... lots of stations beaconing far to often IMHO.
de John EI7IG
New FIX for PCSAT-1 to manage the load.
Yes, we noticed that 2/3rds of all PCSAT-1 users are in Europe in a SMALL footprint. While in the USA, there are only half as many users but spread out over a much larger area. SO the congestion must be maybe 4 times worse over there in Europe..
Its a shame as this will shorten the live of PCSAT for us all if sometime is not done...
Its very difficult to get in at weekends... lots of stations beaconing far to often IMHO.
We will configure PCSAT-1 to operate like the terrestrial network under the New-N paradigm. This will help prevent uesrs that are using a rate that is too high. We will turn OFF all RELAY, WIDE, ARISS and APRSAT digipeating. We will turn on ONLY WIDEn-N digipeating because it has a built-in dupe elimination filter.
Users will only be allowed to send the same packet once a minute.
Althought this will help protect PCSAT-1 from overload, it will make throughput less since those same people who transmit too much and too often will react by trying to send more often. This will further jam the uplink.
But maybe they will eventually learn and give PCSAT-1 and other small users some free air time.
Bob, WB4APR
Hi Bob,
We will configure PCSAT-1 to operate like the terrestrial network under the New-N paradigm. This will help prevent uesrs that are using a rate that is too high. We will turn OFF all RELAY, WIDE, ARISS and APRSAT digipeating. We will turn on ONLY WIDEn-N digipeating because it has a built-in dupe elimination filter.
Thats a good idea and hopefully will increase the passes that I can work perhaps?
Could you also just check that this path is correct.
currently i have : APRS,ARISS,SGATE,WIDE5-5
should this now be: APRS,WIDE,SGATE??
I hope I understand this correctly.
Thanks, Chris
We will configure PCSAT-1 to operate like the terrestrial network under the New-N paradigm. This will help prevent
uesrs
that are using a rate that is too high.
currently i have : APRS,ARISS,SGATE,WIDE5-5
should this now be: APRS,WIDE,SGATE??
No, for Uiview it should be APRS,WIDE2-2
Users will only be allowed to send the same packet once a minute.
Only "saw" two stations get through PCSAT on the 23:40 UTC pass over central USA. (Orbit #31850). Try again tomorrow I guess.
Thanks for supporting PCSAT! -- 73 de JoAnne K9JKM k9jkm@amsat.org
Only "saw" two stations get through PCSAT on the 6 Nov 23:40 UTC pass over central USA. (Orbit #31850). Try again tomorrow I guess.
Yes, when we changed the path to WIDEn-N, it took a while for people to see the bulletins. But the switch to the universal APRS path of WIDEn-N (Usually WIDE2-2) is being successful at slightly reducing the number of duplicate packets. I wonder if those in Europe have seen an impact?
Bob, Wb4APR
Hi Bob,
I will try again over the weekend and report back on Monday..
Thanks,
Chris - M0DQO Fareham UK, SATGATE
-----Original Message----- From: "Robert Bruninga" bruninga@usna.edu To: "'AMSAT-BB BB'" amsat-bb@amsat.org Date: Thu, 8 Nov 2007 18:14:05 -0500 Subject: [amsat-bb] Re: PCSAT-1 over Europe
Only "saw" two stations get through PCSAT on the 6 Nov 23:40 UTC pass over central USA. (Orbit #31850). Try again tomorrow I guess.
Yes, when we changed the path to WIDEn-N, it took a while for people to see the bulletins. But the switch to the universal APRS path of WIDEn-N (Usually WIDE2-2) is being successful at slightly reducing the number of duplicate packets. I wonder if those in Europe have seen an impact?
Bob, Wb4APR
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participants (4)
-
Chris Bloy -
JoAnne Maenpaa -
John Ronan -
Robert Bruninga