or Connect
AVS › AVS Forum › HDTV › Local HDTV Info and Reception › Charlotte, NC - OTA
New Posts  All Forums:Forum Nav:

Charlotte, NC - OTA - Page 62

post #1831 of 7659
Does anyone have any idea why the OTA digital channel of WCCB 18 is breaking up badly? Also pretty much the same thing and unwatchable via DirecTV which tells me that the problem is not on my end since DirecTV is obviously picking up the same weak signal.
post #1832 of 7659
Quote:
Originally Posted by bdfox18doe View Post

Their PSIP generator has crashed.. the channels you list are their native RF channels, the PSIP generator makes them show up as 46 and 55, as well as insert the EPG.

Did WCNC's PSIP generator crash recently. I moved my UHF antenna to see if I could get some more distant channels and WCNC cnannels 36-1 and 36-2 moved to 22-1 and 22-2.
BTW, nothing distantly new either.
post #1833 of 7659
Quote:
Originally Posted by Trip in VA View Post

Stations in Charlotte boosting power:

WHKY-DT
WCNC-DT (Increase height, not power)
WTVI-DT
WMYT-DT
WUNG-DT (Increase in height more than power)
WAXN-DT

For most of them, the power increase will be negligible. WAXN-DT will go from 50 kW to 150 kW, WTVI-DT from 2.2 to 2.6 kW, WHKY-DT from 600 kW to 950 kW from a different tower. Everything else will be minor. All will probably not occur on 02/17/09, but some months after.

- Trip

Cool thanks.
post #1834 of 7659
Quote:


WAXN-DT will go from 50 kW to 150 kW,

WAXN-DT will go to 90Kw by April 15. The step to 150Kw will be in 2010 as the antenna has to be changed from Non-DA to DA. We must protect WFMY-DT, Channel 51 in Greensboro.
post #1835 of 7659
Quote:
Originally Posted by hornmdt View Post

Does anyone have any idea why the OTA digital channel of WCCB 18 is breaking up badly? Also pretty much the same thing and unwatchable via DirecTV which tells me that the problem is not on my end since DirecTV is obviously picking up the same weak signal.

same here with me also, twc and ota, house was basically unwatchable last night
post #1836 of 7659
Sorry for the problem, we've been dealing with mutiple component failures in the microwave link to the transmitter. Should be better now and hopefully will hold in until parts arrive.

As to WCNC-DT, other than some incorrect mpeg program ID's, their PSIP appears to be fine at this point in time.
post #1837 of 7659
Quote:
Originally Posted by nctarheel View Post

I have read from various sources that in order for a station to broadcast a program in HD, a switch must be flipped, literally. If the flip is not switched to HD, then an HD program will be pillarboxed or windowboxed. What would happen if the HD switch was not turned off, and was activated whilst a non-HD program is being shown?

You would get a black screen, no content.
post #1838 of 7659
Quote:
Originally Posted by nctarheel View Post

I have read from various sources that in order for a station to broadcast a program in HD, a switch must be flipped, literally. If the flip is not switched to HD, then an HD program will be pillarboxed or windowboxed. What would happen if the HD switch was not turned off, and was activated whilst a non-HD program is being shown?

Technically three things must happen

1) The content must be produced (encoded, etc etc) in a HD resolution (usually 720 or 1080i for broadcast content) and the equipment that transmits the content must be capable to passing along that content

2) if any sort of VCR, DVR, Digital Converter etc is in use it has to be able to receive that signal and output it in a format usable by the viewer (i.e. if you've got a TIVO Series III or HD, you can set it to 420 and watch HD content on a SD TV...)

3) The TV has to be set up depending on the user's preference (720p, 1080i etc)



Generally most HD channels *will not* show all their content in HD. Local daytime TV and commercials will usually be in SD and this will not cause the TV to black out... what may happen though, depending on your equipment and settings is you may see a SD picture floating in the middle of a 1080i screen etc. I get this often as this is what our HD cable boxes do by default - HD channels are sending information for a full 1080i picture, but SD is send down centered in the middle. This is corrected by changing the box or the TV setup to stretch programming in SD resolution.

Because HD requires much more detailed information it's much more likely to black out if there's a loss of signal... so sudden changes in signal are likely to be most visible on HD channels rather than SD channels.


Hope that helps a bit
post #1839 of 7659
Quote:
Originally Posted by nctarheel View Post

I have read from various sources that in order for a station to broadcast a program in HD, a switch must be flipped, literally. If the flip is not switched to HD, then an HD program will be pillarboxed or windowboxed. What would happen if the HD switch was not turned off, and was activated whilst a non-HD program is being shown?

There is no simple answer and it varies dependent upon station infrastructure and operating procedures.. In our case..FOX Network, 700Club, Raymond, Ellen,Wheel & Jeopardy,Boston Legal, and ACC BB, are all produced and delivered to us in HD. These are recorded or aired Live in HD..and the SD feed is derived in house from these feeds as they air. Usually, this is automatically handled by tally logic so that the correct sources are routed. However if the op forgets to flip the enable switch for the instances that aren't fully logic automated, you would see normal SD and upconverted from SD on the HD even tho the source is HD.
post #1840 of 7659
If the flexicoder is set to an HD port, you will get zero out unless an HD source is fed in, as it reads the SD input data as errors and discards it, much different than a STB.
Since most TV stations have the flexicoder input switched between HD and upconverted SD, that is the switch that most refer to as needing to be in the right position.
post #1841 of 7659
Quote:
Originally Posted by soundguy315 View Post

Since most TV stations have the flexicoder input switched between HD and upconverted SD, that is the switch that most refer to as needing to be in the right position.


Except for those of us who use Harmonic encoders and switch all sources via HD routers
post #1842 of 7659
Does the router pass SD in out as HD? Built in upconverter?
It would be nice to have that luxury here. We use an upconverter with switchable input to get SD content into HD.

I'll trade you an upconverter and a future intern for your Harmonic ;-)
post #1843 of 7659
Quote:
Originally Posted by soundguy315 View Post

Does the router pass SD in out as HD?

Yes, but any SD has to be upconverted to HD to go into the air chain. So our router is switching the HD encoding chains between upconverted SD for non-hd programming, HD network (in the case of WOLO/ABC ,WCCB/FOX is MPEG spliced in the ASi domain),the XDCamHD playback decks, and the Omneon HD Spot server.
Oh yea, and production control in HD for Live News.
post #1844 of 7659
Hi All

The quality of the HD stream I receive from Time Warner is REALLY starting to bug me. Whenever there is a lot of movement on the screen (explosions etc.) I notice significant pixelation. Low motion (talking heads) shots are fine but I still see interesting artifacts when standing really close.

I sadly don't have a blu-ray player for comparison but given how much I'm shelling out each month, I'd welcome any thoughts as to if there is likely to be a noticeable difference when viewing the same content via an OTA stream.

Thanks in advance.

PS My screen is a Sony KDL-46v2500.
post #1845 of 7659
Quote:
Originally Posted by Kaizen28 View Post

if there is likely to be a noticeable difference when viewing the same content via an OTA stream..

Yes.
post #1846 of 7659
Quote:
Originally Posted by bdfox18doe View Post

Yes.

C'mon Bob, you can't just leave me hanging like that.

At least give me something on a scale of 1 to 10.

Thanks for the quick reply!
post #1847 of 7659
TW sends HD at about 6-10Mbit/s, OTA can be as high as 19.39 Mbit/s. Though some of the locals around here are only doing around 11. So you can see that OTA has an advantge from the start, and that is before you start dealing with muxing that channel with others in the cherry picker and dynamic bandwidth compromises.
post #1848 of 7659
All North Carolina TV stations will perform an "analog black-out" test at 6:25pm on Jan 15th for 5 minutes. Some stations will do a second test at 7:30pm the same day. That test will vary in length from 2 to 5 minutes. per NCAB
post #1849 of 7659
I've been following Trip's TVGOS digital deployment listings on rabbitears.info for several months now. I live downtown (28202) in a multistory condo and can not get the WSOC analog feed (to be discontinued in a few weeks anyway) due to severe multi-path interference and have been awaiting to see if WBTV's digital feed will begin transmitting the info. I have a Sony KDL-52V4100 and can pickup all of the digitally transmitted feeds well. Does anyone know WBTV's plans?
post #1850 of 7659
Quote:
Originally Posted by CLT OTA Nut View Post

I've been following Trip's TVGOS digital deployment listings on rabbitears.info for several months now. I live downtown (28202) in a multistory condo and can not get the WSOC analog feed (to be discontinued in a few weeks anyway) due to severe multi-path interference and have been awaiting to see if WBTV's digital feed will begin transmitting the info. I have a Sony KDL-52V4100 and can pickup all of the digitally transmitted feeds well. Does anyone know WBTV's plans?

So here is an interesting development. My TVGOS magically populated last night, but the host channel is Digital Channel 11-0 which would be WTVI!?!?!? Does this make any sense? Will WTVI and not WBTV be providing TVGOS post transition?

Dustin
post #1851 of 7659
Quote:
Originally Posted by Theo1080 View Post

All North Carolina TV stations will perform an "analog black-out" test at 6:25pm on Jan 15th for 5 minutes. Some stations will do a second test at 7:30pm the same day. That test will vary in length from 2 to 5 minutes. per NCAB

Aww.. let's do it in the middle of LOST,NCIS and House...
post #1852 of 7659
hey leave NCIS alone
post #1853 of 7659
Quote:
Originally Posted by Zaxcom View Post

hey leave NCIS alone

You shoudl be watching it in HD and so would not be affected there Zax!
Unless there were no audio................
post #1854 of 7659
true, very true
post #1855 of 7659
I know there are engineers for some of the stations in this area present, so maybe this would be a worthwhile question.

The WCCB gear, how much would it cost to change channels on it? I was looking at Charlotte as a market earlier and I noticed that unlike channel 27, channel 26 looks to be wide open. It might be something to consider if you get complaints in the eastern portion of your coverage area from 27 in Raleigh. Would the antenna work with channel 26, being right next to 27?

Similar story for WAXN. Channel 35 looks open, and depending on what kind of antenna is up there for WSOC, I don't know much about it, but maybe a channel 35 could coexist on the same antenna with the channel 34 WSOC signal without having to protect Greensboro.

I dunno, just thoughts. Maybe WMYT could move off of that horrible channel 39 allocation down to channel 24. Or if this stuff happened, maybe to channel 50 since their tower site is probably far enough away from WFMY to make it work.

- Trip
post #1856 of 7659
Quote:
Originally Posted by Trip in VA View Post

The WCCB gear, how much would it cost to change channels on it? - Trip

Not even under consideration. But I do know the costs having worked on a "few" dtv's now. And it is a
significant cost.
post #1857 of 7659
I mean, just moving one channel down. Would the antenna handle it? I'm curious what equipment would have to be replaced (aside from the mask filter) for just one step down.

- Trip
post #1858 of 7659
Quote:
Originally Posted by Trip in VA View Post

I mean, just moving one channel down. Would the antenna handle it? I'm curious what equipment would have to be replaced (aside from the mask filter) for just one step down.- Trip

Antennas are typically channel cut. And, dependent upon the transmisison line used tuning stubs that have to be adjusted for lowest SWR. The RF network (channel filter, Magic T RF switch), is channel cut and tuned as well. Also, the transmitter ouput cavities would have to be retuned,exciter channels changed, and a few other things.

We're doing this exact same thing now at WAKA-DT changing a 3-Tube transmitter from Ch-55 to Ch-42.
post #1859 of 7659
Quote:
Originally Posted by Trip in VA View Post

I dunno, just thoughts. Maybe WMYT could move off of that horrible channel 39 allocation down to channel 24.

WMYT did ask to move to channel 46 which is currently occupied by analog WJZY close by, so as to get away from co-channel interference from WKTC-DT in Columbia SC. But the FCC turned them down because of adjacent-channel interference with WYCW-DT in Asheville.
post #1860 of 7659
I'm aware, thus why I suggested 24. I think they tried to get 24 once before but I couldn't find the dismissal documents to find out why. Regardless, it looks doable now if it wasn't before.

- Trip
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Local HDTV Info and Reception
AVS › AVS Forum › HDTV › Local HDTV Info and Reception › Charlotte, NC - OTA