HDTV is inexorably moving across the country, even some XX.1, XX.2 channel
leaking across from XE land.

Is this new digital product subject to the same TVI as analog, displaying the
same "sound bars", "herringbone", etc., or do we need to decode new
artifacts to
know if our TVI is from radiated or conducted signals?

The artifacts seen on digital TV, such as they are, are very different
from TVI artifacts on an NTSC broadcast signal. You won't see (or
hear) sound bars, hum bars, herringbone, buzz, at all (unless perhaps
your TVI is so powerful that it's getting directly into the final,
analog stages of the TV... not likely unless you're running a kilowatt
right next door).

You'll tend to see one of two types of interference artifact on DTV
signals:

(1) Macroblocking. Square or rectangular portions of the picture will
freeze, "tear up" or become monochrome.

(2) "Looking for signal" - the whole digital signal "drops out" and
the TV blanks the screen and complains.

The audio will exhibit analogous dropouts - momentary gaps in the
sound, or complete silence when the signal is lost entirely.

The character of the artifacts probably won't be terribly useful in
figuring out if a ham transmitter is involved... you'll have to depend
on the timing (e.g. if macroblocking starts happening when you
key-down, your transmitter may be involved).

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
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