i have been trying to dig up some decent info on how the local oscillator in a lnb works, and also what the local oscillator frequencies for different lnbs are.
so far, what ive read says that the local oscillator frequency in a lnb mixes with the frequency received from the satellite, filters them both out, and sends the difference out to the receiver.
so according to that, if you are looking at a transponder that is at 12060mhz and your lo freq is 10750mhz the signal sent down the wire is 1310mhz
12060-10750=1310
that seems simple enough, but here is a curve ball,
i have a superdish stacked lnb.
it apparently has 2 local oscillators, selected by voltage on the cable.
i have read a lot of info on them, but everyone seems to disagree on what the actual frequencies of the two local oscillators are in these lnbs.
i have read 10000mhz, 10600mhz, 10750mhz, 11250mhz, 13850mhz, and 14350mhz!!!!
try to replace the 10750mhz lo freq. in the above equation with a few of these frequencies and it just doesnt make sense.
so does anyone know how this really works, and what the local oscillator frequencies are in this lnb?
thanks,
Denny