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West Palm Beach, FL - HDTV - Page 9

post #241 of 9284
Sorry for the reposts but is anyone getting a widescreen HD image from WPBF as of now? Are they just transmitting the analog feed over the dig channel or do i again have new hardware probs? LOL
post #242 of 9284
HTnut,

As you indicated, WPBF is transmitting their analog feed over their unmapped digital channel.
post #243 of 9284
Hey Guys,

I am in the Parkland area and I have a DTC-100 with a Color King 5886 in the attic. I mainly put it up there for FM and as an after thought I put a splitter on and ran one side to the DTC-100 and the other for FM. I have only only played with it a couple times but during the day not at night. Channel 12 is the only one that comes in good at least during the day. I forgot what it remapped to. My questions are as follows:

1. Is that splitter possibly causing any problems?

2. Is this antenna the right one to use? It was given to me so I have no ties to it

3. Should I pick up an amp from the shack and give that a try?

Thanks
post #244 of 9284
Thanx Rock.. I feel better now. After my new probs with the Toshiba from the latest update i didnt know if it was me or not... much appreciated sir!
post #245 of 9284
Thread Starter 
ECHOSLOB,

THe Color King 5886 should be fine. Just make sure it's aimed in the direction of the stations you are interested in. (The small end is the "front.")

www.antennaweb.org lets you put in your street address to get a map with radials showing the direction of any stations in your area.

Channel 12 is currently analog only. We should have WPEC-DT on the air on channel 13 sometime in the later half of the month. (Harris is supposed to be here in about two weeks to begin transmitter tests.) Your DTC100 should show the analog channel 12 as 12-0. Once WPEC-DT is up, tune in 13-1. It willl then remap to 12-1.

A correctly functioning splitter will only drop the signal level by 3 or 4 dB. That's usuallly not a big deal unless the signal is marginal to begin with. From Parkland you would probably have trouble with 25 (currently "16-1" until they get their PSIP data in order) but I would think that 28-1, remapped to 29-1, should be viewable. You might need a preamp for your antenna, though.

Sometimes attic installation isn't great for distant, weak signals, and all bets are off if you have a metal roof.
post #246 of 9284
Thanks Dave. I have a tile roof and I am embarrassed to say after I posted I found the instruction sheet and of course the antenna is 180* off The big end is pointed towards Miami. LOL I will switch it around and give the AMP a shot. Thanks.
post #247 of 9284
Thread Starter 
Here's the thread for the Miami/Ft. Lauderdale stations:

http://www.avsforum.com/avs-vb/showt...threadid=43823
post #248 of 9284
My DST 3000 receiver arrived yesterday, up here in Stuart.

At first I only received WPBF as 16-1, then later in the evening I moved my antenna, and was able to pick up FOX on 29-1.

ABC had me bummed, the signal didn't look all that much better than cable, and it was definitely windowboxed. I couldn't get the TV to switch pic sizes (said - not available) and my DST 3000's three modes (Full, Cropped, windowboxed) didn't make any difference on the picture. Later in the evening, I moved the antenna and was able to pick up FOX. Low and behold, the Bernie Mack show came on, and presto - there was a show in full 16:9! I was jazzed! But, I have no clue what res it was in?
post #249 of 9284
Thread Starter 
The feed that WFLX gets from Fox for its 16:9 widescreen shows, like Bernie Mac is in the 480/60p format. Like everything else, WFLX-DT upconverts this to 1080/60i for transmission over-the-air.

At this time all that WPBF-DT is doing is taking their analog 480/60i standard-definition signal from their master control switcher and upconverting it to 720/60p for air, which admitedly doesn't look very good. You can see lots of composite NTSC video artifacts in the picture.They will eventually start passing the ABC HDTV primetime programming in ABC's native 720/60p HD format along with ABC's DolbyDigital 5.1 audio. They just haven't received all of the equipment yet.

The vast majority of ATSC receivers only allow you to zoom, stretch or add gray side panels when receiving standard-definition 480/60i signals. Since these stations are upconverting everything to 1080/60i or 720/60p your receiver locks-out these features. As a workaround, when watching shows that are 4:3 standard-definition shows that are just being upconverted by the station, try feeding the 480i S-Video output of your ATSC DTV receiver into an S-Video input on you HD monitor. It may look a little worse or perhaps little different but at least you'll regain the ability to zoom, stretch or add gray side panels if that is important to you.
post #250 of 9284
Thanks for the info David, and the validation of what my eyes were seeing.

One question: 480/60i? I understand the difference between 480p and 480i, but what's the 60?

Seperate note - for any other Treasure Coast viewers on the thread. I'm using a Toshiba DST 3000 and a Megwave (non-amplified) antenna. I'm receiving WPBF with a solid signal, and WFLX with a varying signal that looks to be about 70% of 100% at best. (Anyone think we should start a seperate Treasure coast thread?)
post #251 of 9284
Hi, I'm new to this so please bear with me. I live in Coral Springs & have an SIR-T150 hooked up to my HDTV set. I tried an indoor antenna with limited success, and then switched to an attic antenna (very proud of myself installing this). The antenna is pointed south since most of the stations I can receive are Miami stations. I do receive WFLX (29-1) quite well, approx. a 65% signal. Although this is one of the strongest signals I get, every once in a while it drops to O% for anywhere from a few seconds up to less than a minute. I have played with the positioning of the antenna with the same results. The strange thing is on some nights this does not happen at all. On Sunday for example, I was able to watch the X-files straight through, no drops, same on Monday for Boston Public. Last night, though, I had to switch to WSVN (ugh) for Malcolm as the drops were very frequent. Does anyone have any ideas? Thanks for any help - this is a great site.
Barry
post #252 of 9284
Quote:


Originally posted by renegadeweeb
Hi, I'm new to this so please bear with me. I live in Coral Springs & have an SIR-T150 hooked up to my HDTV set. I tried an indoor antenna with limited success, and then switched to an attic antenna (very proud of myself installing this). The antenna is pointed south since most of the stations I can receive are Miami stations. I do receive WFLX (29-1) quite well, approx. a 65% signal. Although this is one of the strongest signals I get, every once in a while it drops to O% for anywhere from a few seconds up to less than a minute. I have played with the positioning of the antenna with the same results. The strange thing is on some nights this does not happen at all. On Sunday for example, I was able to watch the X-files straight through, no drops, same on Monday for Boston Public. Last night, though, I had to switch to WSVN (ugh) for Malcolm as the drops were very frequent. Does anyone have any ideas? Thanks for any help - this is a great site.
Barry

I had this problem for a while, due to the use of a computer in my house that was near the coax from the antenna. If you can't trace it to something within your house causing the interference, it is possible that it is something external to your house. I remember somebody on this forum who had a problem with a neon sign at a gas station, I think...
post #253 of 9284
Thread Starter 
Folks commonly throw terms like 480i, 480p, 720p and 1080i around without specifying the temporal resolution, which can vary.

In ATSC you can have:


480/60i=60 fields per second, yielding 30 interlaced frames per second (the same as analog NTSC video)

480/24p=24 progressive scanned frames per second

480/60p=60 progressive scanned frames per second

720/24p=24 progressive scanned frames per second

720/60p=60 progressive scanned frames per second

1080/60i=60 fields per second, yielding 30 interlaced frames per second

And there's even a provision for:

1080/30p and 1080/60p, although currently it isn't possible to transmit these inside of a 6 MHz bandwidth.

So I'm just being a little more specific in describing what the stations are sending.
post #254 of 9284
Thread Starter 
Quote:


Originally posted by aviators99


I remember somebody on this forum who had a problem with a neon sign at a gas station, I think...

That was me! (But it was the neon lighting on the Park Ave. BBQ restaurant near my house.)

Yes, radio frequency interference (RFI), the stuff that causes black and white sparkles in the picture and static in the sound on analog TV can impair digital TV reception and it manifests itself just as you described, Barry: it can cause freezing and intermitent loss of signal.

Impulse noise from man-made sources of RFI is far more common at VHF frequencies than it is in the UHF spectrum but if the UHF signal is low to begin with, as it would be from your distance, it will be more susceptible to interference.

Another source of strong impulse noise is arcing on high-voltage insulators on powerlines. When we go a long time without rain, dirt builds-up on the insulators and acts as a semiconductor, leading to arcing. When the next good rainfall comes, the dirt gets washed away, the arcing subsides and the interference stops.

If you're keenly interested in receiving West Palm Beach stations from Coral Springs you might consider an antenna rotator or, better yet (and cheaper, too) just adding a second dedicated antenna pointing north with a seperate coax and an A/B switch to switch between the two antennas.
post #255 of 9284
Thread Starter 
Quote:


Originally posted by james_h
I'm using a Toshiba DST 3000 and a Megwave (non-amplified) antenna. I'm receiving WPBF with a solid signal, and WFLX with a varying signal that looks to be about 70% of 100% at best.

WFLX-DT's transmitter is west of Lantana in east-central Palm Beach County while WPBF-DT is in Martin County so Treasure Coast viewers will need "more antenna" to get WPTV, WPEC, WFLX, WXEL and others that are sited in Palm Beach County with reception comparable to WPBF and WTVX.
post #256 of 9284
David - I think your message got a bit crossed. Based on my signal however, I'll assume WPBF is broadcast from Martin, and WFLX is Lantanna?
post #257 of 9284
Thread Starter 
Yes, thanks. (I have corrected my post.)
post #258 of 9284
I have some interesting comments on my observations since WFLX and WPBF have come on the air. For my UHF-DT I use a 4 Bay Bow tie antenna, originally aimed at Miami. My signal strength for the three Miami DT was 96-97%. The analog signals for the Miami UHF where excellent, no ghosting, although Ch.51 and 69 where a little weaker than the others, but fully watchable. The Palm Beach analogs had strong signals, but heavy ghosting, specially on WFLX and WXEL. WPBF was weak. When WFLX came on the air, I was getting 50% signal, constantly going down to 0%, so I turned the antenna towards their transmitter (I'm in Boca, about 15 miles from the antenna farm). The signal went to 98%, the ghosting on their analog went away. WXEL comes in perfectly in analog, but WPBF was still weak. The big thing is that I did not lose my Miami stations. I still get 95% signal on WPBT, WFOR, and WBZL. The analog transmissions are still good for most except Ch. 33 and ch. 69, which are weaker, although watchable. The kicker is that WPBF-DT is coming in at 85% signal, no dropouts, perfect, while it's analog companion is not what I would consider very watchable, although there is some interference on that frequency, I believe from a an LP station in the Dade county area (when I'm down there that's all that comes in on Ch. 25). So from this I believe that the 8VSB transmission system is very good for range, lower power penetrates better than analog, but is highly sensitive to multipath(ghosting in the analog world). My experience with WFLX reception showed this flaw.

Best viewing,

Jose W2JD

PS- By the way, for the VHF-DT out of Miami I use a 5 element Ch.7-13 Antennacraft beam, aimed at Miami, and get 86% signals.
post #259 of 9284
aviators99 ,David McRoy & W2JD

Thanks to all for your quick responses. I think I will try turning my antenna 180 deg & see if that works (easiest to try). Don't really want to run another cable, that was a pain. I can't imagine what could be causing the interference, but I must have something. I get lots of interference on my cable feed as well that I assumed originated with the cable company, but now I wonder if that is at my end. I did notice that all the electrical wiring for my air conditioning unit is right in that part of the attic so I wonder if that could be the source. I'll experiment with the air on/off tonight before anything else. Thanks again.
Barry
post #260 of 9284
I too have been playing with my antenna today. I had been using a non-powered megawave oriented roughly south - south east toward West Palm.

I was receiving WPBF at 100% and WFLX at 44% average, high of 51%. I switched to my old faithful channelmaster (or somesuch) rabbit ears with UHF loop, and was able to get WFLX up to 93% average, high of 100%.

I don't figure there's much chance of pulling in the Miami stations. If I could, I guess at a minimum I'd have to go with a roof mounted antenna with rotor, which I'd rather not do yet...

Now that I'm getting a stronger signal from WFLX, my DST 3000 has apparently mapped channel 28-1 to 29-1 and is giving me Channel ID info it didn't give before. I'm not getting any behavior like this from WPBF yet (it's 16-1 and no Channel ID).
post #261 of 9284
Thread Starter 
WPBF-DT isn't sending data to instruct receivers to remap yet.

Renegadeweeb,

"Cable leakage" is another potential source of interference. It's when the cable TV system in your neighborhood has poor grounding and radiates some of its signal over the air, as well as the system picking up interference from broadcast signals. Cable companies are held to certain standards for this. It might be possible to get them to come out and test for this.
post #262 of 9284
Update on my attempts to solve problem with low cable channels and 'HDTV antenna' grounding...problem worse, more ideas?

I added a "static" bleed thingy...obviously not the official name of it... to the circuit from my attic antenna--down_the_wall->staticthingy->lowband_filter->SIR-T150 cable path but the only (easy) ground nearby was the shield of the Adelphia cable which is grounded outside the house, so the circuit adds EARTH_GND<-Adelphia_cable->staticthingy->VCR->HDTV to the diagram.

Turns out this is worse (who would have guessed that direct coupling would be worse than capacitive coupling ?-).

I checked that the Adephia_Cable shield has continuity to the Earth_ground - fine. So it looks like the static build up on the center conductor is not high enough to discharge across the staticthingy, but high enough to be messing up my low channels (somehow...not sure why this is).

The extra connectors in the HDTV signal path is just enough to make WPBF (off the back of the antenna) unreliable also, so this is getting complicated. Now I have to put the pre-amp back in the circuit or add an antenna switch and a second antenna. I can't believe I'm doing all this for "just television"...
post #263 of 9284
Thread Starter 
Pogo,

A good way to check for impulse noise interference is to look for "sparklies" in you VHF NTSC pictures. If you see impulse noise in the analog picture and the static discharge unit doesn't fix it then your problem isn't coax static buildup. It may be impulse noise from another source like arcing powerline insulators. As I stated in a previous post this can really get out of hand when we haven't had rain in a while and we have high winds that can blow dirt all over the power grid...the exact conditions that we are experiencing right now in south Florida.

I'm looking at all the VHF NTSCs right now here in Lake Worth and they all look clean but how do they look where you are?
post #264 of 9284
Thread Starter 
BTW, I just noticed that WPBF-DT's audio problem isn't a simple channel balance error. They're only in DD 2.0 for the time being and the left and right channels are out of phase with each other.
post #265 of 9284
Quote:


Originally posted by David McRoy
Pogo,

A good way to check for impulse noise interference is to look for "sparklies" in you VHF NTSC pictures. ... all the VHF NTSCs right now here in Lake Worth and they all look clean but how do they look where you are?

Yes, sometimes the problem is organized sparklies, but unplugging and then replugging the "Adelphia_cable->VCR->HDTV" cable clears the image of sparklies and the increased "graininess" of other VHF NTSC channels.

I checked that the Adelphia cable shields are connected to the earth ground, visually and with VOM. What else can I check before I ask Adelphia to help, (which is probably going to cost me)?

Last time Adelphia came out, they unconnected the cable at the VCR, trimmed a little bit off the center conductor, reconnected it and claimed the center conductor "was too long and was shorting inside the unit". Since the problem doesn't come back right away, there is no way to prove them wrong at the moment they are here.
post #266 of 9284
Any word on when WPBF will be broadcasting their Dig signal???
post #267 of 9284
I was just wondering if anyone knows what happened to WHDT? I thought that Gunther had announced they would be 24/7 by May 1st. I can't wait to see Leave it to Beaver in High Definition and pristine monochrome!
post #268 of 9284
Thread Starter 
I still don't see an antenna on Gunther's roof yet. It should be approximately where the old aviation marker mast used to be:

www.whdt.net

They replaced the mast with a large strobe beacon on the north side of the penthouse several months ago.

Meanwhile, WPBF-DT's DD 2.0 audio is in phase now. Still no word on a date for DD 5.1 and ABC-HD passthrough. I'll delve...
post #269 of 9284
Thread Starter 
WPBF-DT expects to begin passthrough of ABC HD programming in June.
post #270 of 9284
? Does WFLX-DT NOT broadcast all day? The last couple of days, I couldn't seem to pick them up until the evening. (I tried today at 3:45 - no luck, and now at 6:15 I've got them). I know I've picked them up midday last week. Are they testing something, or, could it just be atmospherics, or, do they not start broadcasting until a certain time?

James
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