With today's technology, the normal LNB is as good as the high stab LNBs used to be. One can still buy a HiStab LNB, but for consumer applications of 4DTV, MPEG-2 and analog you really do not need one. You might want to consider a High Stability LNB if your running a radio station downlink, paging or some other mission critical application as well as subject to extreme temperature deviations.
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These are the numbers that you will need to enter into your MPEG-2 receiver for it to work.
The LNB outputs a range of 950-1450 MHz.
We can figure what frequency your receiver is actually tuned to as follows:
Take for example NASA TV as it exist today on AMC-9 using a transponder frequency of 3880.
The C Band LO of 5150 is the starting number and we subtract the transponder frequency of 3880 from it:
5150 - 3880 = 1270
So your receiver is actually tuned to 1270 MHz which is within the range of 950-1450 MHz that comes from your LNB.
Lets try another one.
KTWO-TV is on satelilte G-10R as it exists today and uses a transponder frequency of 12.108 GHz. The math is a bit different, but simple still.
12.108 - 10.750 = 1358 MHz
Again, this is what your receiver is tuned to.
This math is what makes the LNB so special, it takes the input, whether it is C or Ku Band, and outputs it in a standard range of 950-1450 MHz.