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[aprssig] PCSAT-1 Load Management over Europe NOW

Robert Bruninga bruninga at usna.edu
Tue Nov 6 22:17:22 UTC 2007


PCSAT had reset this afternoon at 2147z over the North pacific
approaching california.  Presumably it was lightly loaded.

Therefore we are setting NOW, the WIDEn-N path which limits
duplicate packets to only one per minute.  Please limit your
packets to limit the load on PCSAT.  Still send your Satelite
Simulated Emergency Test email and make contacts, but lighten up
over the peak load over Europe. 

PCSAT PATH is now VIA WIDEn-N (use either WIDE1-1 or WIDE2-2).

We had hoped to hold off on this until 8 Nov (Half way through
the full sun period).  But it will be better to do it now to
save PCSAT>

Enjoy.
Bob, WB4APR
Naval Academy Satellite Lab

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert
Bruninga
> Sent: Tuesday, November 06, 2007 2:39 PM
> To: 'TAPR APRS Mailing List'
> Subject: [aprssig] PCSAT-1 Load Management over Europe
> 
> Change coming for PCSAT-1 to preserve its power budget as long
> as possible. 
> 
> Sent: Tuesday, November 06, 2007 1:42 PM
> 
> 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
users
> 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,
> initially, 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 if PCSAT-1
> crashes we will all lose it.
> 
> Maybe they will eventually learn and give PCSAT-1 and other
> small users some free air time.  We will post announcements
for
> the changeover on 8 Nov.
> 
> Bob, WB4APR
> 
> 
> 
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