Horizon sat meterDoesn't matter which one for basic alignment, but i like to check all outputs as a precaution, it is not completely unknown for an LNB to be faulty on one port. What are you using to align the dish?
Its a quattro for use with a multiswitchA quattro or a quad?
Quattros are used for distribution systems Each output is one of 4 possible outputs Hi band V / Hi band H / Lo band V / Lo band H.
Quads have 4 outputs all of which do all 4 bands.
If its a quad use any of the outputs.