04 Mar 08 07:41, TOM WALKER wrote to ROY WITT:


 RW>> Which wasn't due to the digital signals being lost at 100mph. Those
 RW>> satellites sent to different planets use digital radio and their
 RW>> signal isn't lost as they travel at speeds hundreds, if not
 RW>> thousands of times faster than 100mph.

 TW> you need to Review your Theroy a bit there Roy.
 TW> Those XRadio Sats are GeoSynchrinious. They appear to Fixed i nthe
 TW> Sky Traveling at thge sale speed as the Earths Rotation.

I wasn't talking about geosynchronus sats, I was talking about those that
have probed the various planets and their moons.

 TW> IF you rembember soem of your Amsat Theroy you should rembember you
 TW> need to sdo Special Tracxking to follow the Frequency change becasue
 TW> of the Doppler effect as the Sat Travels form Horizon to Horizon.

It's not a frequency change, it's a polarization change...That's why
you'll see different looking antennas which are capable of switching from
one polarization to the other. Circularly polarzed antennas work best for
amateur sat work.

                R\%/itt



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