Possible new problem TVI
 

I assume many will go to over-the air reception of local channels to get the
highest versions of HD (Cable and satellite can't do this).

Does this mean we go back to having TVI problems
as we did before cable?

Dave K4JRB

Possible new problem TVI
 

On Mon, 15 Jun 2009 15:43:02 -0400, David Thompson wrote:

I assume many will go to over-the air reception of local channels to get
the highest versions of HD (Cable and satellite can't do this).

Does this mean we go back to having TVI problems as we did before cable?

Dave K4JRB

I switched to digital about 3 years ago. All over-the-air, no cable or
satellite. The little bit of TVI had been seeing went away entirely when
I switched.

---
Rich W2RG

Possible new problem TVI
 

In m "David Thompson"
wrote:

I assume many will go to over-the air reception of local channels to
get the highest versions of HD (Cable and satellite can't do this).

Does this mean we go back to having TVI problems
as we did before cable?

On the other hand, it means I no longer live in a channel 2 area; maybe
I'll finally try 6 meters.

--
Bert Hyman St. Paul, MN

Possible new problem TVI
 

"Rich Griffiths" wrote in message
communications...


I switched to digital about 3 years ago. All over-the-air, no cable or
satellite. The little bit of TVI had been seeing went away entirely when
I switched.

But sometimes the circuits in the TV pick up TVI directly. In my
unfortunate case, a big tube Sony, circa 1995, is on a digital cable box
that outputs S-video/stereo audio to the TV. When I put antennas too close
to the living room, I caused analog TVI in the form of SSB "wah-wah" in the
audio, with flashing and streaking in the picture. (Had I been getting in
at RF channel frequencies, digital would have shown tiling and audio
dropout, which it didn't.) I filtered the heck out of those three cables
and it only helped a little. I think the internals of the set are the
receiving antenna(s).

I don't see a Faraday cage for a 35" TV in my future.
She-who-must-be-obeyed wouldn't like it, either.

"Sal"

Possible new problem TVI
 

"Sal M. Onella" wrote in message
...

"Rich Griffiths" wrote in message
communications...


I switched to digital about 3 years ago. All over-the-air, no cable or
satellite. The little bit of TVI had been seeing went away entirely
when
I switched.

But sometimes the circuits in the TV pick up TVI directly. In my
unfortunate case, a big tube Sony, circa 1995, is on a digital cable box
that outputs S-video/stereo audio to the TV. When I put antennas too
close
to the living room, I caused analog TVI in the form of SSB "wah-wah" in
the
audio, with flashing and streaking in the picture. (Had I been getting in
at RF channel frequencies, digital would have shown tiling and audio
dropout, which it didn't.) I filtered the heck out of those three cables
and it only helped a little. I think the internals of the set are the
receiving antenna(s).

I don't see a Faraday cage for a 35" TV in my future.
She-who-must-be-obeyed wouldn't like it, either.

"Sal"

If you ground all the inputs, do you still have interference? Common mode
is the usual problem. Given the number of DVD-players, VCR's, surround
sound systems, switchboxes, Media Center computers tied in, you could easily
have more problems than which of seven remote controls to look for.

Possible new problem TVI
 

On Tue, 16 Jun 2009 12:51:04 -0700, Sal M. Onella wrote:

"Rich Griffiths" wrote in message
communications...


I switched to digital about 3 years ago. All over-the-air, no cable or
satellite. The little bit of TVI had been seeing went away entirely
when I switched.

But sometimes the circuits in the TV pick up TVI directly. In my
unfortunate case, a big tube Sony, circa 1995, is on a digital cable box
that outputs S-video/stereo audio to the TV. When I put antennas too
close to the living room, I caused analog TVI in the form of SSB
"wah-wah" in the audio, with flashing and streaking in the picture.
(Had I been getting in at RF channel frequencies, digital would have
shown tiling and audio dropout, which it didn't.) I filtered the heck
out of those three cables and it only helped a little. I think the
internals of the set are the receiving antenna(s).

I guess this analog-to-digital transition is going to be another your-
mileage-may-vary situation, but I do hope it works out for most folks.

Did you also check out the power wiring as another possible antenna? If
proximity of the RF source and the TV system was a factor, I think I'd
worry more about the susceptibility of the receiving system more than the
cleanness of the RF source, and RF getting in by the power cord used to
be a common problem.


I don't see a Faraday cage for a 35" TV in my future.
She-who-must-be-obeyed wouldn't like it, either.

"Sal"

For sure, it's not nice to fool .... OH! ... I guess you mean the
wife :-)

--
Rich

Possible new problem TVI
 

"JB" wrote in message
...

"Sal M. Onella" wrote in message
...

snip

But sometimes the circuits in the TV pick up TVI directly. In my
unfortunate case, a big tube Sony, circa 1995, is on a digital cable box
that outputs S-video/stereo audio to the TV.


snip


If you ground all the inputs, do you still have interference? Common
mode
is the usual problem. Given the number of DVD-players, VCR's, surround
sound systems, switchboxes, Media Center computers tied in, you could
easily
have more problems than which of seven remote controls to look for.

I will try that and see what happens. Thanks.

"Sal"

Possible new problem TVI
 

In article ,
"David Thompson" wrote:

Does this mean we go back to having TVI problems
as we did before cable?

Dave K4JRB

Dave K4JRB,

I ran into a weird problem with our new HDTV. Anytime I would transmit
with over 100 watts the RF was QRMing the remote control receiver inside
the Sony and causing the Menu to flash on and off. No issues at all with
audio or video. The fix was the addition of common mode filters.

Check out the article on page 40 of the July issue of QST for pictures
and more details.


Dick AA5VU