San Francisco, CA - OTA - Page 410 - AVS | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!


Forum Jump: 
 59Likes
Reply
Thread Tools
post #12271 of 12277 Unread Today, 12:15 AM
AVS Special Member
 
Larry Kenney's Avatar
 
Join Date: Nov 2001
Location: San Francisco, CA
Posts: 2,850
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 214 Post(s)
Liked: 39
I wrote:
I saw it earlier this week when watching "The Voice" via Dish Network. Switched to OTA 11.1 and it's there, too. I think KNTV is the source of the problem! Something there is intermittent.
Bobby replied:
Quote:
Originally Posted by bobby94928 View Post
Larry, I know you also have Comcast. How does it look there? Comcast is fiber fed direct to the POP.
Good point! I don't watch KNTV that often, but I do watch "The Voice" every week. The next time I see pixelation on KNTV on Dish or OTA, I'll check my Comcast feed to see what it looks like there. I haven't noticed any problems with the Comcast KNTV feed so far.

Larry

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
Lots of Broadcasting links and information: http://www.choisser.com/broadcast.html

Check out photos and info on my antennas: http://www. larrykenney.com/tvantennas.html

Larry Kenney is offline  
Sponsored Links
Advertisement
 
post #12272 of 12277 Unread Today, 01:24 AM
AVS Special Member
 
Larry Kenney's Avatar
 
Join Date: Nov 2001
Location: San Francisco, CA
Posts: 2,850
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 214 Post(s)
Liked: 39
I was just surfing the channels and signals tonight are the strongest I've seen in a long time. It's good to see some signs of action in getting the more distant stations.

Larry

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
Lots of Broadcasting links and information: http://www.choisser.com/broadcast.html

Check out photos and info on my antennas: http://www. larrykenney.com/tvantennas.html

Larry Kenney is offline  
post #12273 of 12277 Unread Today, 07:10 AM
AVS Special Member
 
Calaveras's Avatar
 
Join Date: Jan 2007
Location: Mountain Ranch
Posts: 3,722
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 488 Post(s)
Liked: 149
Quote:
Originally Posted by PeninsulaMark View Post
Unplugging the AC from the AMP ----> SNR = 24. Plugging AC in -----> 25.5 . Have three TV's attached to the AMP.

Explanation for 11.1 now at 25 after being 32-33 for weeks ?

I don't know exactly what's going with your setup but your signals are so strong that you can still receive stations through the amp with it powered off by leakage alone. This is telling you that the amp isn't necessary and you may be better off without it.

As far as KNTV is concerned it sounds like you need to start calling KNTV.

Chuck
Calaveras is online now  
post #12274 of 12277 Unread Today, 07:37 AM
AVS Special Member
 
Calaveras's Avatar
 
Join Date: Jan 2007
Location: Mountain Ranch
Posts: 3,722
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 488 Post(s)
Liked: 149
Now that there is a consensus that KNTV is having a problem, the symptoms sound like their transmitter is the issue. I've seen pixelation problems many times on low power stations. Many of us have seen it on KFTY and K03HY.

My observation is that if the link is the problem, then you see pixelation but the SNR is stable. I've actually seen messages on KMMD that say "weak signal" when the link is bad. OTOH, if you see pixelation and the SNR is unstable then there's a transmitter problem. From Mark's report the problem seems to be with their transmitter.

Chuck
Calaveras is online now  
post #12275 of 12277 Unread Today, 08:36 AM
AVS Special Member
 
Otto Pylot's Avatar
 
Join Date: May 2004
Location: San Jose, CA
Posts: 8,057
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 413 Post(s)
Liked: 313
Sounds like until KNTV pulls the plug out of their @@@ and looks into what the cause may be, we're stuck with this problem for awhile
Otto Pylot is online now  
post #12276 of 12277 Unread Today, 10:28 AM
AVS Club Gold
 
Keenan's Avatar
 
Join Date: Aug 2003
Location: Santa Rosa, CA
Posts: 29,188
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 862 Post(s)
Liked: 648
Quote:
Originally Posted by dr1394 View Post
MPEG-2 bit-stream errors are pretty interesting. Exactly where they occur can make a big difference in the visual severity of the impairment. In my simulated example, I stacked the deck to make it more severe.

First, I chose an I-frame (also called a key-frame) that was right after a scene change. Then I flipped a bit that caused the decoder to realize that the bit-stream no longer makes sense. However, in MPEG-2 there is a resynchronization point at the first macroblock for each macroblock row (that is, the left hand side of the image).

Here's what that I-frame looks like. The error is in macroblock row 28 and column 27. The decoder gives up at column 40 (there are 1088/16 = 68 rows and 1920/16 = 120 columns). Since the decoder gave up, the orange video you see on that macroblock row is what's leftover in the frame buffer from a previous frame (in this case, since it's at a scene change, it's obviously different). The decoder resynchronizes on the next macroblock row.
Again, much thanks, those two posts have explained what many of us have seen on and off for years in a very easy to understand and informative fashion. If you need a second career you should try your hand at education!
Keenan is online now  
post #12277 of 12277 Unread Today, 10:33 AM
AVS Club Gold
 
Keenan's Avatar
 
Join Date: Aug 2003
Location: Santa Rosa, CA
Posts: 29,188
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 862 Post(s)
Liked: 648
Quote:
Originally Posted by Otto Pylot View Post

Watching Grimm now and there are sill some sporadic issues. Hopefully a KNBC engineer is reading this. The issues we are seeing now seem to be more audio related than pq.
As an FYI for research on this problem, I watched Grimm on KNTV via Comcast last night and there were zero problems. I have several other KNTV recordings I haven't had a chance to watch yet but when I do I'll report back, but it does seem as if the fiber feed to Comcast is problem free.
Keenan is online now  
Sponsored Links
Advertisement
 
Reply Local HDTV Info and Reception



Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off