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Paths through PCsat



PCsat users:
In looking at a 18 hour log of PCsat for today, I think there is a
missunderstanding of how to set the path for an APRS satellite.

Take a look at the following log (truncated to paths only) to see how
Paths of WIDEn-N and TRACEn-N are being added to the PCsat path.  This not
only adds 14 bytes to every packet, but it also causes dozens of dupes
all over the continent for each successful packet drastically increasing
QRM everywhere.

There should never be anything in a PCsat path other than via W3ADO-1 (or
its other calls) since everyone in the footprint has an equal chance at
hearing every downlink packet.  There is just no need for these multi-hop
extensions totally cluttering the 145.825 frequency with 5 to 14
terrestrial copies of every successful packet!  Remember, these
terrestrial copies are also on 145.825 thus jamming other potential users.

I am amazed that anything gets through this mess...

What you don't see below is the 5 to 15 copies of EACH packet that I had
to filter out of the file...

ZL1***>APRS,W3ADO-1,ZL3AI-4,MARLEY-1*,WIDE3-3:HOT STUFF AT BLUFF..
ZL2**>APU16K,W3ADO-1,ZL3AI-4,MARLEY-1*,WIDE3-3::ZL2VAL   :i dont think
CU7***-3>APU16M,W3ADO-1,F4CEP-15,F1EUC-14,F1PRY-2,F5JSD-14,TRACE3*,WIDE7-7:...
F4***-3>APRS,W3ADO-1*,TRACE5-5,DF5FF-10,I,DB0GV-15,I:
VK2***>APU24L,W3ADO-1*,SGATE,VK8ZAB-6,I:=3430.44S/15047.40E]:
2E1***>CQ,W3ADO-1,F4CEP-15,F1EUC-14,F1PRY-2,G3OJZ-6,TRACE3*,WIDE7-7:>Hello
SM0***>UY1P24,W3ADO-1*,TRACE5-5,SM6TKY-2,I:
OH9**>APU24L,W3ADO-1*,RELAY,WIDE3-3,TRACE5-5,SM6TKY-2,I:
OH1**-3>APU24L,W3ADO-1*,TRACE5-5,SM6TKY-2,I:
SM0***>APK101,SK5MK*,W3ADO-1,TRACE5-5:
KS4**-6>APRS,W3ADO-1*,SGATE,TRACE3-3/1:
SM3***>APU16K,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE3-2,WIDE7-7,F1EFQ,I:=6309.22N...
I6***>W3ADO,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE3-2,WIDE7-7,F1EFQ,I:
DO9**>APU16K,W3ADO-1,F4CEP-15,F1EUC-14,F6KLH-2*,TRACE3-1,WIDE7-7,F1EFQ,I:
OE3**>APU24L,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE3-2,WIDE7-7,F1EFQ,I:
I6***>W3ADO,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE3-2,WIDE7-7,F1EFQ,I:
SM7***>APD213,W3ADO-1,F4CEP-15,F1EUC-14,F6KLH-2*,TRACE5-2,F1EFQ,I:
2E1***>CQ,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE3-2,WIDE7-7,F1EFQ,I:
F9**>TEST,W3ADO-1,F4CEP-15,F1EUC-14,F6KLH-2*,TRACE3-1,WIDE7-7,F1EFQ,I:
G4***>APU16M,W3ADO-1,F4CEP-15,F1EUC-14,F6KLH-2*,TRACE3-1,WIDE7-7,F1EFQ,I:
F6***>F9XG,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE3-2,WIDE7-7,F1EFQ,I:
EA7**>APRSAT,W3ADO-1,F4CEP-15,F1EUC-14*,TRACE7-4,WIDE5-5,F1EFQ,I:
F6***-5>APU24L,W3ADO-1,WIDE7-3,TRACE3-1,SGATE,F1EFQ,I:
F6***>APU24L,W3ADO-1,TRACE5-3,WIDE7-5,SGATE,F1EFQ,I:
N3***-3>APK101,KD4QIA-7*,WIDE3-1,W3ADO-1/1::KF4ZYN-9 :

I saved this next one as an example of a typical Kenwood short packet with
a proper path for comparision:

N3ZLL-9>S9ST1V,W3ADO-1*:'gW4l!/K\]"42}

It is digipeated once, everyone sees it.  One packet.  0.5 seconds total
channel utilization time.  I hope we can educate users to properly setup
their stations for PCsat and other UI digipeating satellites in the future
so that we can all use the channel efficiently..

de WB4APR@amsat.org, Bob

PCsat WEB  page     http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ:       http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs     http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages     http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES     http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite  http://www.toad.net/~wclement/bruninga/mic-lite.html

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