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Re: Trying AO-40

On Monday, Jun 2, 2003, at 14:35 America/Chicago, Edward R. Cole wrote:

> What I haven't seen discussed here is the
> fact that not only is there Doppler due to the orbital movement of 
> AO-40
> but there is earth rotational Doppler and all Doppler effects vary with
> your latitude.


KB9CRY asked this same question the other day in his report of his 
first successful DX contact.  And it is an interesting concept.

But can one assume that for a given position, you could fix your 
reference plane on the earth and make the assumption that only the 
satellite moves?  You would still be taking the rotation of the earth 
into account as it would affect the resulting orbit of the satellite.  
It would seem to be an easier analysis to have a fixed point of 
reference and one moving one as opposed to two moving points.  
Obviously, both move, but I think you could model it the way I 
described.  Would that make it more complex or easier?  It make it 
easier to visualize IMO.



Jon Ogden
NA9D (ex: KE9NA)

Citizen of the People's Democratic Republik of Illinois

Life Member: ARRL, NRA
Member:  AMSAT, DXCC

Ham Radio Webpage: http://www.qsl.net/na9d   <- Updated on 1/12/03!!!
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"A life lived in fear is a life half lived."
                                               - From "Strictly Ballroom"

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