[amsat-bb] CAPE-1 Tracking

Jonathan Wagner jonathan at jonathanwagner.net
Wed Apr 18 12:18:42 PDT 2007

Hi all,

We are trying to gather a full snapshot of 3 CW beacons from CAPE-1 to 
get an idea of the health of the satellite.  Part of the problem is that 
we don't know exactly where CAPE-1 is located.  TLE's are available on 
W0RPK's website http://showcase.netins.net/web/wallio/CubeSat.htm about 
half-way down.  We managed to hear a weak signal starting about 435.254 
MHz and ending around 435.237 MHz tracking object #31126.  We've 
obtained some information that CAPE may actually be a little behind this 
one even, but we're not sure. 

The satellite is transmitting CW and 9600 baud G3RUH, but currently we 
are primarily interested in the SSB CW.  Also, if you have the 
capability any recordings are more than welcome.  Recordings can be sent 
to jonathan at jonathanwagner.net  If the recording is too large, send me 
an email and we'll figure out how to get it across.  The CW beacon we 
are looking for the most is the beacon 1 which gives us an idea of 
battery health.  The telemetry format is available at 
http://ulcape.org/wiki/CAPE1_Telemetry  There are a few audio examples 
at DTUsat's webpage http://www.dtusat.dtu.dk/index.php?id=94  The second 
file labeled Unknown.wav is what the G3RUH data sounds like in SSB mode 
and has been confused as the letter N. After that signal ends, the next 
CW beacon is about 10-20 seconds away.

The satellite is transmitting at 435.245 +/- doppler.  Any help would be 
greatly appreciated.  Again any recordings or decoded telemetry can be 
sent to me at jonathan at jonathanwagner.net

Jonathan Wagner, KE5FSG
Cell: (337)781-1513

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