at the suggestion of 1074j, I have looked specifically at my reception of KMSB and KTTU. I have tended to ignore them as they keep disappearing from my favorites lists. The reasons for this are now somewhat clearer.
KMSB 11/25: I can receive the carrier signal, with a signal quality of around 70, but it never shows an image, or audio. There is no channel name of equivalent analog station number, so I may not be getting the PSIP data, either. It seems to me that I did get this station at one time, but not recently.
KTTU 18/19: This one is even stranger. When I do an auto scan for digital stations, it counts channel 19 as a digital station, but does not add it to the list. If I manually add it, I get a signal quality of 75 (occasionally dropping to 0), but my Dishnet 6000 HD receiver still refuses to add it to the list. When watching channels, I can not manually go to 019-1 either, it will jump to the nearest valid channel, instead. Obviously, I can not tell what the image or sound quality is like if it will never accept 19 as a possible channel. I think I may have been able to get this one in the past, as well.
During the auto scan for digital channels, I am not getting 8 or 9 of the 9 possible digital channels listed on antennaweb.org for this area. But, only 6 end up available for watching. Even KWBA, with a very weak signal of 65 comes in clearly (may be sending lots of redundant data for their SD only broadcasts ?), but the stronger KMSB and KTTU signals are complete no shows. I am about to email the stations directly and confirm their digital broadcast tower locations, and see if they know why their signals are not receivable. Does any one else get the stations OK, and are you using a different digital tuner than mine? These are not high priorities, but I would like to watch 24 with the better PQ, and try Enterprise in 16x9 (possibly HD) on my big screen.
Space Scientists think LIGHTYEARS outside the box! 21 Red 2 Blue