[amsat-bb] Re: Delfi-C3 pass 0846 UTC over Denmark

Wouter Jan Ubbels wjubbels at gmail.com
Wed Jul 30 03:11:32 PDT 2008

Hi Ib,

thank you very much for your observations, I presume that the
frequency offset of 9kHz you state takes Doppler into account?
W.r.t. signal strength, it certainly helps a lot to switch
polarization, both the uplink and downlink antennas on the spacecraft
are turnstile antennas, which have circular polarization, which is
max. circular when the long axis of the satellite is in your
direction. Since the circularity / axial ratio of the downlink
antennas is very good (the uplink is somewhat worse), listening on the
opposite circular polarization (provided that you use circular
antennas on your side of course) may wipe out the signal completely:)

73 & hope to work you soon via DO-64

Wouter PE4WJ

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