Now this begins to make some sense; Of course the geosync satellites do go into eclipse season trice a year, during which each day the satellite is passing through the Earth's shadow for a variable period.
To pass though the shadow of a solar lunar eclipse, the eclipse would have to be visible on the ground at satellite sub-satellite point ( nominal, the equator). For the Inmarsat's this would be at: 24.8 E 25.1 E 64.5 E 109.0 E 143.5 E 178.1 E 218.0 $ 261.9 E 262.4 E 306.0 E 344.5 E But, since there are satellites virtually anywhere along the arc, there is no reason to restrict observations to INMARSAT. But INMARSATs do provide a easy target for an observer with simple L-Band equipment. Of course I would expect to see a shift in an onboard crystal frequency (but not a "jump") simply from the thermal changes. Lester B Veenstra MØYCM K1YCM [email protected] [email protected] [email protected] -----Original Message----- From: Lux, James P [mailto:[email protected]] Sent: Monday, June 29, 2009 7:36 PM To: [email protected]; 'Discussion of precisetimeand frequency measurement' Subject: RE: [time-nuts] Orbiting crystals > -----Original Message----- ................. I think the idea was to look for jumps in a crystal oscillator when it goes through the shadow of a total eclipse. My original suggestion was to look for LEO satellites which had conveniently monitorable oscillator frequencies. Someone else suggested using Inmarsat (because they have a L-band pilot tone), but I think the Inmarsat birds are in Clarke orbit, so you'd have to pick your ground station location (essentially in line with the sun and the bird) to do the test. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
