[amsat-bb] can RF change the orientation of a satellite?
Auke de Jong, VE6PWN
sparkycivic at shaw.ca
Sat Oct 23 18:44:26 PDT 2010
I couldn't help but notice that on this website
http://www.intelsat.com/resources/galaxy-15/faqs.asp about "zombiesat"
Galaxy 15, Intelsat figures that the lack of RF on thr transponder package
since their loss of control earlier this year, will actually make it take
longer to saturate it's momentum-wheel orientation stablizer system. This,
compared to the manufacturer's original estimate of achieving the saturation
condition beuing several months sooner having assumed normal full-load of RF
on the transponders.
My question is: How is this possible? Does the RF put acceleration-forces
on the transmitting antenna of the satellite similar to ion propulsion, or
does the uplink RF push on the receiving antenna? Is there some other
mechanism that can electronically alter the forces acting on the body of the
satellite based on the amount of RF power?
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