Mars Express / Mars Odyssey Reception by G3WDG and G4KGC
Antenna: 3m Andrews 0.3f/D dish with CP feed antenna
Receiver: 0.8dB noise figure -> modified prototype WDG002
Waterfall display: AO40rcv
MEX Signal Level: ~30dB S/N in 1Hz bandwidth (Dec 2003)
Odyssey Signal Level: ~20dB S/N in 1Hz bandwidth (Jan 2004)
Sun noise: 16.2dB
Moon Noise: 1.95dB
System noise temperature: ~84K
Results (click all photos to enlarge)
Photo of new dish feed
Photo of original dish feed
Photo of preamp using MGF4919 (~0.55dB NF)
Reception of Mars Express on 17 Dec 2003
recording of above signal (~1MB wave file)
First Reception of Mars Odyssey (on 11 Jan 2004)
Reception of Mars Odyssey on 12 Jan at approx 1434z, showing slow upwards frequency drift caused by Doppler just before "transit"
Reception of Mars Odyssey on 12 Jan at approx 1441z, showing faster downwards frequency drift caused by Doppler shift a little time after "transit"
Reception of Mars Express at 1429z on 13 Jan 2004 very close to spacecraft passing behind Mars (occultation). Doppler is changing more rapidly than seen for Odyssey. (MEX has elliptical orbit, Odyssey believed to be near circular).
Mars Express received at 1430 on 13 Jan 2004. Signal disappeared as spacecraft passed behind Mars.
Rosetta received on 20 March 2004
recording of this signal