said by ticktack :
your HD channels are totally seperate. You need to tune to an HD channel and check the in band status, that will show the SNR for the current frequency you are tuned to.
How high that should be depends on the modulation of the channel. assuiming it is QAM 256 it should be at least 32 but preferably 33 or more.
I did check the in-band stati of both tuners, per the guide that I referenced, and both SNRs there were within the limits that the guide indicates are acceptable.--
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