[amsat-bb] ISS packet mode

Bob Bruninga bruninga at usna.edu
Sun May 2 12:18:37 PDT 2010

>> wouldn't the path be rs0iss-4?

When you look at what others are using, you may see a lot of RS0ISS-4* but do not be fooled.  Remember, that when a user uses any of the GENERIC paths on the uplink, that the ISS does callsign-substitution before digipeating on the downlink.  So you will see everyone with RS0ISS-4* in the dowlink even though they used ARISS, or APRSAT, or whatever on the uplink.  And you cannot tell what they used!

But, If they use WIDEn-N on the uplink, then it will NOT do callsign substitution and will only come back as WIDEn-N MINUS 1.  AND those packets will NOT SHOW UP ON ANY ARISS web page, because there is no way for the global APRS system to know that it went via the ISS.

All of the other APRS satellites, PCSAT, PCSAT2, ANDE and RAFT all responded to the ARISS and APRSAT aliases, and that is the beauty of the system.  Whichever satelltie digpeated, would substite its call so the global APRS system could see what satellite digipeated it.  Unfortunately, in its degraded-state, PCSAT1 only recognizes ARISS when it is recoverd.  All the rest of the time, it ONLY responds to VIA W3ADO-1.

Hope that helps.
Bob, Wb4APR

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