[amsat-bb] DELFI-C3 rx report 2008-05-01

[Rob Hardenberg PE1ITR]

Hi,

Today tracked 7 passes of delfic3 all with good signals. The transmitter on 145.930 is random on
and off each pass but its always present. Tracking NORAD# 32787 matches AOS and LOS very well.
Interesting was pass 4 and 5 with low elevation. Signals where good and I could decode some
packets on pass 4. Received signals on pass 5 but decoded nothing because the tx switched on to
late (just before LOS).

I noticed in RASCAL a correlation between the distortion on the downlink system and the OBC System
bus voltage value. When the voltage showed 7~8 volts the distortion was present. It looks like the
distortion intervals has also a correlation to the satellite spin cycle.

1. 1-5-08 07:55:22	08:05:45
2. 1-5-08 09:30:49	09:44:21
3. 1-5-08 11:07:24	11:19:16
4. 1-5-08 12:45:09	12:50:32 elevation < 2
5. 1-5-08 17:25:08	17:30:02 elevation < 1°
6. 1-5-08 18:56:13	19:07:54
7. 1-5-08 20:31:01	20:44:31



73 Rob PE1ITR
http://www.pe1itr.com