ISS

ISS packet mode

Subject: [amsat-bb] ISS packet mode
From: Bob Bruninga
Date: Sun, 2 May 2010 15:18:37 -0400 (EDT)

>> 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



ISS + STS132 (Space shuttle Atlantis)
16 May 2010, 10:41-10:46UTC (19:41-19:46JST)
Photed by JH0XBV
Nagano in Japan
OLYMPUS SP-500UZ
16 seconds F5.0


http://iss.jaxa.jp/iss/map/issgallery.html
http://www.nasa.gov/mission_pages/shuttle/main/


ISS and Atlantis in front of the Sun

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