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RE: PC2 => PC1 Satellite Link



HI Bob,

I'm still new to how APRS works (asked Santa for a book this Christmas...).  
What prevents the two satellites from sending the same packet back and forth 
to each other, like a big cosmic oscillator?

Greg  KO6TH


----Original Message Follows----
From: "Robert Bruninga" <bruninga@usna.edu>
To: <amsat-bb@amsat.org>
Subject: [amsat-bb] PC2 => PC1 Satellite Link
Date: Sat, 03 Dec 2005 09:22:16 -0500

Today at 1215z we switched the PCSAT2 (on ISS)
downlink to 145.825 so that it operates as a
simplex digipeater on the same frequency as
PCSAT-1.  Just minutes later we saw this packet:

2005 12/03 12:19:10 :
PCSAT2>BEACON,PCSAT-1*,WIDE,qAO,WA4AEJ-5:
T#541,024,027,219,018,016,11101111,0000,1

Which is a telemetry packet from PCSAT2 relayed
via PCSAT-1.  At that time PCSAT2 was over
Quebec and PCSAT-1 was over New Orleans for
a path length of 2260 mi.   We pulled this packet
out of the live downlink on http://pcsat.aprs.org

It also appeared on the live downlink page for
PCSAT2: http://www.findu.com/cgi-bin/pcsat2.cgi?

As PC1 and PC2 go in and out of view of each
other, we welcome reports of any other successful
satellite-to-satellite packets.

PCSAT2 will remain on 145.825 downlink until 7
Dec when it will go back to UHF to avoid any
possible interference with the next ARISS school
contact on the 8th.

PC2 Page: http://web.usna.navy.mil/~bruninga/pec/pc2ops.html
PC1 Page:http://web.usna.navy.mil/~bruninga/pcsat.html

Bob Bruninga, WB4APR
USNA Satellite Lab
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