[amsat-bb] Delfi-C3 information

Nico Janssen hamsat at xs4all.nl
Sun May 11 07:57:59 PDT 2008

Hi all,

For those of you who are monitoring the Delfi-C3 telemetry, here is
some information on some of the abbreviations used in the RASCAL
telemetry decoding software:

- OBC     On Board Computer
- OBM     On Board MORON
- MORON   Malfunctioning OBC Recovery OptioN
- ComBo   Combination Board
- EPS     Electrical Power Subsystem
- MeBo    Measurement Board
- RAP     Radio Amateur Platform
- ICB     InterConnect Board

The average RAP 2 beacon frequency is around 145.9318 MHz. The actual
frequency depends on the temperature of the transmitter. Just after
leaving eclipse, when the transmitter is cold, the downlink frequency
is 145.9323 MHz. While the transmitter warms up, the frequency drifts
down to about 145.9313 MHz before entering eclipse again. So during
an ascending pass, this downward drift adds some 500 Hz to the
total observed doppler shift.

I think by now everybody will agree that Delfi-C3 is object 32789,
or 2008-021G.


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