Raul,
HRD is a great program, though the Doppler correction is not quite right. Also, at some time the FT-847 support got broken. Simon is aware of both these issues, and is doing a full update to make the satellite tracking function a separate program. So don't count HRD out yet. It should be an excellent program.
For now, take a look at SATPC32 here: http://www.dk1tb.de/indexeng.htm Erich has developed the program over the years which handles the FT-847 very well. Once you set it up, it makes operating almost as easy as HF. Almost. Hi Hi! The Doppler correction is very good. With fresh Keps and an accurate computer clock, it easily handles the AO-51 mode S downlink, which has a large and rapidly changing Doppler shift. You can download a fully functional evaluation copy, and give it a try. There are many here who use it and can answer your questions. While not free, it is not expensive, and the registration fee goes directly to AMSAT to support the ongoing and future operations.
73s,
Alan WA4SCA