11785H/27500 3/4
11785 is the frequency of the transponder or multiplex in MHz.
Some receivers will want this in GigaHertz - 11.785 GHz.
H means horizontal polaratiy or polarisation.
27500 is the Symbol Rate (in kiloymbols per second).
3/4 is the FEC or "Forward Error Correction" rate.
To get a specific channel in the mux with most receivers, you enter the above parameters and hit "tune" , "find", "scan" or similar.
The box should them dispaly a channel list for you to select from - i.e. the channels it found on the multiplex that corresponds to the 11785H/27500 3/4 settings that you entered.
Other receivers may respond by asking for a Program ID or PID. There are separate PIDs for the video and audio channels and they are lsited at
http://www.lyngsat.com/hotbird.html and simialr sites if needed.
Chris Muriel, Manchester