If you are new to satellite tracking visit www.amsat.org maintained by The Radio Amateur Satellite Corporation (AMSAT) for excellent articles written for new satellite users.
Ham Radio Deluxe‟s Satellite Tracking support would not be possible without the help of David Taylor and his open source satellite-tracking library. After using David‟s code to get started I wrote my own library, shipped as a DLL with Ham Radio Deluxe and based on NORAD SGP4/SDP4 Implementations by Michael F. Henry.
Note: The most important rule: it's the frequency on the satellite that is important, not the frequency on your radio. This is the most common mistake made when using a satellite.
If you are using two radios for satellite tracking – one for transmit, the other for receive – read this section first, then refer to Synchronizer. Dual radio support is arguably the most flexible way to work with satellites.