The Inmarsat-4 F3 satelite was launched by a Proton-M launch vehicle from Baikonur in Kazakhstan at 2243 UT on 18 August 2008. I set my receiver on 1018.5 MHz during the early morning hours of 19 August. and connected it to the SDR-14 which recorded the signal spectrum on a so-called waterfall display. When I woke up at 0400 UT I tried to detect signals on 1020.5 MHz without result. Tried the same again at 0500-0515 UT - again without result. This is not to say that "absence of evidence is evidence of absence"! However, after leaving home at 0545 UT I let the SDR-14 record the signal spectrum around 1018.5 during the rest of the day. The table below summarizes all receptions made. The last signals from Briz-M were received about 12 hours after launch.
|Reception #||Date||Time (UT)||Notes||Adjacent mission event|
|1||19 August 2008||0237-0238||Single carrier, rapid Doppler||Briz-M shutdown at 0227 UT|
|2||19 August 2008||0239-0241||Two carriers 12 kHz apart? Rapid Doppler|
|3||19 August 2008||0249-0323||Three carriers 0, +/- 16 kHz|
|4||19 August 2008||0348-0425||Three carriers 0, +/- 16 kHz|
|5||19 August 2008||0617-0627||Two carriers +/- 16 kHz||Briz-M firing 0725-0730 UT. The S/C separated at 0746 UT.|
|6||19 August 2008||0853-0923||Single carrier|
|7||19 August 2008||1011-1031||Single carrier|
|8||19 August 2008||1053-1103||Two carriers +/- 16 kHz|
The strange shapes of the spectrogram traces are explained in a previous article on Briz-M tracking.
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