Bill
All consumer level LNBFs will drift. See also the
Invacom specs
http://sadoun.com/Sat/Products/Invacom/Single.pdf
The drift is +/-3 Mhz. At 15F, the LNBF will drift to the max.
If you are looking for a commercial level stable LNBF, then prepare to spend $$$ for it.
