At 3:25 PM -0400 5/22/08, Manfredi, Albert E wrote:
Craig Birkmaier wrote:Hunold, Ken wrote:Perhaps you might need an analog tuner after next February, but I'd venture a guess that the vast majority of other users would have no need for another NTSC tuner and would benefit from the few extra dB of sensitivity.Why would there be any difference in sensitivity?Because the analog demod can only increase the noise figure of the receiver, all else equal, which directly impacts on sensitivity. The receiver noise floor, i.e. sensitivity, is directly related to antenna temperature (which you can't do much about), channel bandwidth (also fixed), loss in downlead, and receiver noise figure.
All equally true for any analog input from the antenna, be it NTSC, 8-VSB, QAM etc.
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