[time-nuts] Time and frequency practical exercise 2018 late quarter; precision measure of 432mhz band Sat in Lunar Orbit
tshoppa at gmail.com
Sat Nov 18 10:16:32 EST 2017
Orbital determination from Doppler shift is, IMHO, a far more interesting
and fun STEM project than measuring an absolute frequency. And it does not
require MASERs, it only requires low-grade amateur equipment.
Amateur "Crowdsourcing" of orbital data goes at least as far back to ARRL
collecting Sputnik reception reports both by traffic nets and audio tape.
Doppler shift for a VHF transmitter in low earth orbit is several 10's of
kHz over a period of minutes and this pass-information is incredibly useful
for orbit determination.
And science and technology students have been participating in these
determinations for decades too. A very nice review of the work done 25
years ago by students, was published in QST by N6XT:
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