[opendtv] Re: Comments about the VHF DTV problems from around the country

Cliff Benham posted:

http://www.broadcastingcable.com/article/talkback/279344-ABC_FCC_Working
_on_DTV_Reception_Issues.php

Wow. I had forgotten about the FM trap aspect of this. Indeed, eons ago,
when I first installed the antenna distribution amp, I saw FM
interference in the analog VHF picture. So I installed FM traps on all
non-FM radio drops.

With digital, you just have to know to worry about this. And like Doug
says, hope the traps aren't creating their own nonlinearities.

However in my case, the fact that my downstairs system with FM traps and
my upstairs system without FM traps behave very much the same, leads me
to believe the ABC7 reception problems are unrelated to FM traps.

Also, I have noticed a definite difference in how VHF and UHF digital
behave. In a word, VHF is far more consistent. If you have marginal VHF
reception, it will remain consistently marginal. You'll see the same
level of macroblocking, for example, over a long period of time. Or if
reception is solid, it tends to remain solid. UHF has a way of looking
fine and then going dark, losing the signal completely, and then coming
back temporarily solid.

I suppose that's as one would expect.

Our ABC7 signal went from being totally absent on the 12th at noon, to
being just an artistic mosaic of macroblocks with no sound on Saturday,
to now being actually viewable and audible. Not pretty, thanks to the
persistent streaks and such, but one can actually follow the program
now. So WJLA engineers have obviously been hard at work. It's a real
crying shame they didn't do VHF DTV tests BEFORE the end of the
transition. Maybe at night.

Bert
 
 
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