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Satellite propulsion thrust equations

Hi folks.
Last week I saw the thread on the South African satellite, which rapidly  
developed into a "we need higher orbit satellites" discussion.
I wondered how high you need to go above a LEO orbit to get some reasonable  
coverage and scribbled a few 'daft' ideas at  _www.g0mrf.freeserve.MEOSAT.htm_ 
To take this forward, or to dismiss it as the case maybe...
My question is:   Is there any available software which can  calculate the 
increase in orbital height for particular changes in mass /  propellant / exhust 
velocity etc?
I've found various formulae at the NASA and ESA sites but there are so many  
variables its difficult to know where to start. - Well, it is rocket  science.
David  G0MRF
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