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Dallas, TX - HDTV - Page 213

post #6361 of 7246
Quote:
Originally Posted by nukeboy67 View Post

I recently bought a 32" Sylvania HDTV from the local Best Buy and let me tell you, it out did my old Magnavox. When I ran its first scan, It picked up 72 OTA stations and KUVN-CA. Can anyone else confirm? When I did signal checks on every channel, everyone has been holding steady for an hour now.

72 is pretty good. I believe there are actually 80 subchannels available in most of the DFW metroplex, although once you subtract out all the color bars and simulcasts, you're left with about 65.
post #6362 of 7246
Quote:
Originally Posted by re_nelson View Post

That's a good television with a really hot tuner (probably a 6th generation LG). I have the 19-inch model. The last AutoScan I did netted 83 digital streams. The last analog I was able to receive here was KZFW/6 but they've been gone for almost half a year.

My only complaint about the Sylvania is that the timeout on the on-screen display is too short. When you're watching the signal meter, it vanishes in about 15-20 seconds unless you press any key to keep it active.

The other trait is more of a nitpick. The signal meter shows a scale of 100 but I've never seen anything in excess of 97%, which appears to be its defacto peak.

After some more scanning, I pick up 76 now. During the midnight hours, I pick up 83 channels. When I get home tomorrow, i'm gonna swing the antenna toward Wichita Falls to see if I can get more than KFDX, KJTL, KAUZ etc.
post #6363 of 7246
Anyone else getting random audio dropouts on WFAA Ch 8? I get this with my TV's tuner, OTA DVR tuner and Zenith converter box. TV diagnostics screen shows a brief burst of errors happening when the audio drops out.
post #6364 of 7246
VHF signals like WFAA are more susceptible to interference from sources of electrical noise, like motors, air conditioners, microwaves, etc. Check to make sure that all antenna connections are tightened and that the antenna and cable are isolated from potential interference. It also might be helpful to review the alignment of your antenna; if you optimize the signal for WFAA, you should have no problems picking up the other stations.
post #6365 of 7246
Also, most antennas are a lot more directional at UHF frequencies than at VHF frequencies, so reflections that get attenuated on UHF might not be attenuated so much (or at all) on VHF, resulting in more potential multipath issues.
post #6366 of 7246
Quote:
Originally Posted by ed_in_tx View Post

Anyone else getting random audio dropouts on WFAA Ch 8? I get this with my TV's tuner, OTA DVR tuner and Zenith converter box. TV diagnostics screen shows a brief burst of errors happening when the audio drops out.

I watched for awhile last night but didn't see anything unusual. Is it still happening?
post #6367 of 7246
Quote:
Originally Posted by JHBrandt View Post

I watched for awhile last night but didn't see anything unusual. Is it still happening?

Nope it seems to have straightened out whatever the cause. I'm watching Ch 8's noon news delayed by 30 min with my DVR right now, and all's OK without a glitch.
post #6368 of 7246
I am bringing up a former question that I had raised in the past regarding addition of a second attic antenna allowing for dedicated cable runs to each of two televisions. The southern most, traditional configuration, UHF/VHF antenna is running to our gameroom set and I am considering the addition of a 4228 UHF/VHF antenna spaced approximately 10-15 feet to the north in a direct line from the other antenna (I would suspend the 4228 from eyelet screws already placed in the roof supports using bungie cords). For those who might suggest a splitter, I tried one last week and could not pick up adequate signal strength using a leftover cable with questionable connectors on either end. A signal amplifier is not an option due to non-access to a power source. By using this potential configuration I can run the original RG59 cable from when the house was built in '89 which I know works (currently accessing Verizon FiOS via CC in a TiVo HD) to the second antenna. My principal question is will the original antenna impact signal reception to the second antenna?
post #6369 of 7246
There is zero chance that anyone can accurately predict what WILL happen in your attic. We can guess, but that's all it will be.

Pre-amps are remotely powered, usually from behind a TV set and fed to the amp module through the coax via a DC Pass splitter . You do NOT need local power in the attic. Here's an example from one vendor: http://www.antennasdirect.com/cmss_f...itter_Opt2.pdf

Using the right equipment makes things easier and cheaper.
post #6370 of 7246
What I was actually questioning was the physics of whether one, quite effective antenna, somehow impacts signal reception of another? I presume that someone has attempted this previously. I'm trying to avoid additional plug in devices (amp) in each room thus the comment about attic amplification. My reference there wasn't clear (my apology).
post #6371 of 7246
Quote:
Originally Posted by teasip View Post

What I was actually questioning was the physics of whether one, quite effective antenna, somehow impacts signal reception of another? I presume that someone has attempted this previously. I'm trying to avoid additional plug in devices (amp) in each room thus the comment about attic amplification. My reference there wasn't clear (my apology).

You might want to take another look at the link that was posted showing the amplifier in the attic. You don't need a power supply in the attic and you don't need any extra equipment in each room. The power is fed up the coax from one of your TV rooms to an amplifier/splitter. Then the cables come down to each room from that splitter the same way they would form your antenna(s).
post #6372 of 7246
I may be totally off but since both antennas are receiving and not transmitting, I can't see how placing two antennas close to each other would do any harm. If one or both was transmitting, then yea there could be issues.
post #6373 of 7246
Antennas are modeled in free space so that their ideal performance can be calculated. When two or more receiving antennas are placed near each other in real space with real objects nearby, there are unintended and often undesirable side effects due to complex impedance perturbations and the influence of reflections. See why I called it impossible to predict?

All you can do is try it. The worse that can happen is that it doesn't work as you want it to.
post #6374 of 7246
So we now have HOT TV on both 26.1 and 31.3?
post #6375 of 7246
Quote:
Originally Posted by JHBrandt View Post

I watched for awhile last night but didn't see anything unusual. Is it still happening?

Actually, last night coincidentally during another NASCAR race the audio was dropping out a little at the beginning, worse on my Zenith and Insignia converter boxes but did it slightly on the Sony TV too with associated error counts at the instant it happened. But it settled down and stopped happening after 7:30-8PM.
post #6376 of 7246
Thanks for the follow up. That was the type of explanation that I was looking for. I had thought that coinciding antennas could impact one another but I wasn't certain. I may give it a shot if the daughter decides she wants the lifetime TiVo with her in Austin.

Quote:
Originally Posted by ProjectSHO89 View Post

Antennas are modeled in free space so that their ideal performance can be calculated. When two or more receiving antennas are placed near each other in real space with real objects nearby, there are unintended and often undesirable side effects due to complex impedance perturbations and the influence of reflections. See why I called it impossible to predict?

All you can do is try it. The worse that can happen is that it doesn't work as you want it to.
post #6377 of 7246
Quote:
Originally Posted by teasip View Post

What I was actually questioning was the physics of whether one, quite effective antenna, somehow impacts signal reception of another? I presume that someone has attempted this previously. I'm trying to avoid additional plug in devices (amp) in each room thus the comment about attic amplification. My reference there wasn't clear (my apology).

Two antennas can interfere with each other, but at 15 feet apart, I doubt they will. The rule of thumb I've always heard is that to avoid interference, two antennas should be separated by twice the longest wavelength involved. That works out to just over 10 feet for WFAA/8. In practice, they could probably be even closer together without issues, but the risk of problems goes up the closer they get.

The only other concern I'd have is if one antenna were directly behind the other, there might not be enough signal left for the one in back to receive. But again, if they're far enough apart, RF will diffract around the front antenna and still reach the back one.

BTW, if you do go the single antenna, amp, & splitter route, you should definitely use a single amp in front of the splitter. You'll need a splitter with a DC pass on one side, so you can hook up the amp's power supply downstairs (avoiding the need for an AC outlet in the attic).
post #6378 of 7246
Thank you as well. Another exercise would be to remove the traditional boom antenna and hang another 4228 as a replacement for it (two in the attic at that point) and see how they play together. This obviously would only occur if money were burning a hole in my pocket. The best approach at present would be just to try the 4228 for the northern most TV and see what happens while leaving the boom antenna in place.
post #6379 of 7246
London Broadcasting is buying KTAQ. They own KCEN, KYTX, and others.

On an unrelated note, London Broadcasting's stations hold the affiliations for MeTV in their respective markets.

Things that make you go "Hmm..."

- Trip
post #6380 of 7246
Would someone explain why Dallas CBS seems to boycott showing the Houston Texans games?

Last week, they did a late switch from HOU-IND to PIT-BAL. This week they are choosing to not show HOU-MIA, which otherwise all of Fla & TX are showing.

I'm confused.
post #6381 of 7246
Because this is Cowboys country, and there is the usual regional hatred between Dallas and Houston. Games most likely to be seen on CBS are either AFC@Cowboys, AFC@other NFC East teams, or best AFC game in the timeslot if neither of those is happening. HOU@anyone rarely qualifies as the best game, though that NO game in week 3 seems like a good candidate to be shown here.
post #6382 of 7246
Quote:
Originally Posted by grittree View Post

Would someone explain why Dallas CBS seems to boycott showing the Houston Texans games?

Last week, they did a late switch from HOU-IND to PIT-BAL. This week they are choosing to not show HOU-MIA, which otherwise all of Fla & TX are showing.

I'm confused.

If you live north of the President George Bush turnpike, you could watch the Texans on KXII. (Alternatively, if you're as far south as Waxahachie, you might be able to watch them on KWTX.) But if you're like most of us, you're out of luck.

During the analog era, with a really good antenna I could get just enough of KXII's signal to watch during the day even south of I-30. But since the digital transition, KXII has been strictly a nighttime station this far south.
post #6383 of 7246
Yep I remember a stack of Ch 12 "Cowboy" antennas at Crabtree's Electronics back in the late '60s.. was a big deal back then.

Just saw, or heard, an interesting audio glitch. Was watching Ch 4 Good Day and they ran the new AFLAC ad with the duck and pigeon, frogs on the turntable water lilies, etc. Funny ad. All voice dialog was completely gone! At the beginning there was no audio at all, then the music and sounds kicked in. Like they were only using only 2 of the surround channels.
post #6384 of 7246
Quote:
Originally Posted by ed_in_tx View Post

Just saw, or heard, an interesting audio glitch. Was watching Ch 4 Good Day and they ran the new AFLAC ad with the duck and pigeon, frogs on the turntable water lilies, etc. Funny ad. All voice dialog was completely gone! At the beginning there was no audio at all, then the music and sounds kicked in. Like they were only using only 2 of the surround channels.

I just caught that ad on CBS 11. A lot of the effects are in only the left and right front channels. Every once in a while I forget to switch my preamp (2 channel) to the output of the Dolby processor. All seems OK for a while and then suddenly everything goes silent when something has audio only in the front left and right channels.

Just the price I pay for using a stereo centric system for 5.1.

I tried turning off the left and right front channels and while some of the effects vanished, most of the dialog remained. So I suspect that the audio spent some time as 2 channel with or without some form of surround encoding. Which was then run through (or not) a decoder before transmission as 5.1.
post #6385 of 7246
Quote:
Originally Posted by schultdw View Post

I just caught that ad on CBS 11. A lot of the effects are in only the left and right front channels. Every once in a while I forget to switch my preamp (2 channel) to the output of the Dolby processor. All seems OK for a while and then suddenly everything goes silent when something has audio only in the front left and right channels.

When I heard this I was watching with a Zenith converter box hooked up to my old 27" Sony CRT set in the bedroom. Only thing I do different there is run the L and R out from the converter box directly to a small stereo amplifier, and some decent speakers.
post #6386 of 7246
Quote:
Originally Posted by ed_in_tx View Post

When I heard this I was watching with a Zenith converter box hooked up to my old 27" Sony CRT set in the bedroom. Only thing I do different there is run the L and R out from the converter box directly to a small stereo amplifier, and some decent speakers.

Which reminds me of a problem I haven't though about for a while. I have but rarely use any more a CM7000 converter. One of the things I hated about it and the other CECBs was they only output two channel audio.

So the converter receives a 5.1 channel digital audio signal and is limited to putting out 2 channels. How does it mix down the audio? True Dolby surround seems out of the question as that would require paying royalties so they did something cheap.

Really cheap and simple would be to run front left and right to the outputs ignoring the center and surround channels.

But we will never know exactly what was done because the manufacturers aren't saying.
post #6387 of 7246
They're paying royalties to Dolby to decode it in the first place, or not paying and risking having a pack of greedy lawyers come after them. Most likely a simple Lo/Ro downmix so they can use the same one for both the L/R stereo outputs and the mono mix on RF without having to worry about phasing issues.
post #6388 of 7246
Found this in a "Dolby Digital Professional Encoding Guidelines" manual online... not that I fully understand it but I see there are variables that could have caused what I heard.

Complete Main (CM)
The Complete Main service (CM) is the normal mode of operation. It contains a complete audio program, with dialog, music, and effects. This is the type of audio service typically provided. The CM service can contain from one to 5.1 audio channels. It can be further enhanced with the VI, HI, C, E, or VO services described below. To provide audio service in multiple languages, individual CM services can be created for each language.

Music and Effects (ME)
The Music and Effects (ME) type of Main Service contains the music and effects for an audio program, but not the dialog. The ME service can contain from one to 5.1 audio channels. The primary program dialog is missing and, if any exists, is supplied by providing a D service. Multiple D services in different languages can be associated with a single ME service.

Dialog (D)
The Dialog type of Associated Service is employed to most efficiently offer multichannel audio in several languages simultaneously when the program material is such that the restrictions (no panning, no multichannel reverberation) of a single dialog channel can be tolerated. When the D service is used, the Main Service is type ME. If the D service contains a single channel, simultaneously decoding the ME service allows a complete audio program to be formed by mixing the D channel into the Center channel. Typically, when the Main audio Service is of type ME, there are several different language D services available. The transport demultiplexer can be designed to select the appropriate D service to deliver to the audio decoder based on the listener's language preference as defined by data stored in the receiver memory.
post #6389 of 7246
4 and 5 (KDFW and KXAS) both just went off the air. I wonder what's up.. a little rain? All the others I checked are OK.
post #6390 of 7246
just flipped TV on and KXAS 5 is still out for me OTA. Both are fine on FiOS.
*EDIT*
KDFW 4 hiccup'd OTA. Signal level is not as high as it usually is.
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