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post #10861 of 10872 Old 07-11-2014, 05:33 PM
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KEMO is not as strong today. My humidity is 61%. KRCB is fine.

KEMO-SD 50.2 appears to be very starved of bits. No audio either. 50.1 is fine.

I have seen this before, time to get a capture and run TSReader!

SHF
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post #10862 of 10872 Old 07-11-2014, 05:39 PM
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There have been huge swings in signal strengths here the last few days again. There have been periods of especially good conditions to Mt. Sutro. The previously troublesome KBCW was SNR 31 dB this afternoon and KPIX was SNR 28 dB. KGO was SNR 31 dB for several hours. The really good conditions were to Salinas again. I've attached a composite spectrum analyzer image showing KSBW towering above all the other VHF stations. Even KCBA was equal to or better than Walnut Grove. The red line is the minimum signal strength of the pilot carrier necessary for the station to decode if the rest of the signal is flat.

A couple hours later KCBA was falling off the cliff.

KFTY was booming at SNR 28 dB.

Chuck
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post #10863 of 10872 Old 07-11-2014, 07:51 PM
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KEMO TSReader output

Hi,

I got a full stream capture of KEMO.

KEMO-SD 50.2 now looks much better than the "I Love Lucy" or other show staring Lucille Ball that was on 50.2 earlier.





I wondered if Lucy was botched when created from the original tape.

Is 1.82 Mbps too low?

SHF
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post #10864 of 10872 Old 07-12-2014, 11:32 AM
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Salinas LPTV is a mess.... or at least most of it is.

During some really good conditions this morning I surveyed the stations down there.

KOTR analog 2 - No longer on the air. No trace of a video carrier under superb conditions.
KMBY-LD 19 - Link problems, picture pixelates all the time.
KLFB-LD 22 - Off the air most of the time and has other issues when it is on the air.
K29AB analog 29 - Link issues, not always repeating KICU. Sometimes has just a ID slide or shows "No signal."
KDJT analog 33 - Has cross hatching interference. (This could be coming from KSDI analog 33 in Fresno although not a trace of KSDI-LD on 44 is detectable here.)
K38JP-LD 38 - Link issues. Pixelates when my TV says 0 errors.
KMMD-LD 39 - Has two dashed lines on the picture. See attachment. What is going on there?

There are a few more LPTV stations down there but I can't receive them.

Don't the owners of these stations ever look at them?

The one exception is KMUV analog 23 a Telemundo station. They now ID like a normal station and have partnered with KION to air a local newscast. I expect they will transition to digital on RF 21 eventually.

Chuck
Attached Images
File Type: jpg KMMD.jpg (113.6 KB, 13 views)
File Type: jpg K29AB.jpg (115.6 KB, 12 views)
File Type: jpg K38JP-Link_Issues.jpg (117.6 KB, 12 views)
File Type: jpg KDJT-Crosshatching.jpg (144.9 KB, 15 views)


Last edited by Calaveras; 07-12-2014 at 02:52 PM.
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post #10865 of 10872 Old Yesterday, 01:26 PM
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KTNC is having trouble with their link this afternoon. Lots of pixelating and long periods with no picture at all. We've had some strange conditions recently but they are very strange today. Still experiencing strong ducting conditions even in the middle of the afternoon.

Chuck

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post #10866 of 10872 Old Yesterday, 01:58 PM
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Signals are down somewhat from normal this afternoon, but not as bad as a couple days ago.

I see what you mean, Chuck, about KTNC. Their signal is holding steady at 23 dB SNR, but the picture on all three sub-channels is going from solid picture to black with a lot of pixelating in between. I noticed that all three are not pixelating the same amount at the same time, so they must be receiving three separate feeds. I wonder what means they use to get their signals from the studio to Mt. Diablo. Would microwave react like that?

Maybe that's what the KGO translator signal looks like when the receiver at Mt. Allison loses the channel 7 signal.

Larry

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post #10867 of 10872 Old Yesterday, 02:05 PM
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Quote:
Originally Posted by SFischer1 View Post
Is 1.82 Mbps too low?
SHF
Good question. I checked other stations and most, except KAXT 1, are allowing more bandwidth than that. Most are 2.5 Mb or better.

From watching KEMO 50.2, the quality of the picture there varies a lot depending on what show is being broadcast. Some look really bad, while others look okay. Some of the real old movies look like they're out of focus.

As Chuck pointed out in his post about Salinas/Monterey stations, I don't think a lot of these stations monitor their sub-channels very closely. You see some pretty terrible looking pictures and hear some very bad audio at times.

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post #10868 of 10872 Old Yesterday, 04:28 PM
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Over the years I've been accumulating the identifications of most of the stations I've received here. I made a simple web page listing all the stations linked to an image.

http://www.aa6g.org/OTA_TV/otatv.html

They're listed by virtual channel. Some of the IDs are not what I really wanted but some stations refuse to identify with a call sign and/or channel number. I noticed that KNTV never shows KNTV 11, just Bay Area NBC. Don't they have to identify once an hour? I'm only completely missing KCNS which I just overlooked. Next time it's in I'll get it. If it's not on my list then I have not received it.

Chuck
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post #10869 of 10872 Old Yesterday, 05:34 PM
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Quote:
Originally Posted by Calaveras View Post
...
I noticed that KNTV never shows KNTV 11, just Bay Area NBC. Don't they have to identify once an hour? I'm only completely missing KCNS which I just overlooked. Next time it's in I'll get it. If it's not on my list then I have not received it.

Chuck
KNTV identifies themselves many times each second.

http://www.rabbitears.info/screencap.../35280-0_0.htm

Quote:
Originally Posted by
Program Association Table

PAT Version Number: 1
Transport Stream ID: 397 (0x018d)

PMT PID 48 (0x0030) - Program 3 KNTV HD
PMT PID 64 (0x0040) - Program 4 COZI-TV


Transport Stream ID: 397 (0x018d) uniquely identifies the station. (DTV TSID:)


http://licensing.fcc.gov/cgi-bin/ws....ility_id=35280



KGO RF 7 and RF 35 have the same Transport Stream ID and KTVU RF 44 RF 48 also.


TSID list on RabbitEars:


http://www.rabbitears.info/oddsandends.php?request=tsid

SHF

Last edited by SFischer1; Yesterday at 07:51 PM.
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post #10870 of 10872 Old Yesterday, 07:56 PM
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Quote:
Originally Posted by SFischer1 View Post
KNTV identifies themselves many times each second.

Maybe I'm just way out of date but it used to be that stations had to ID once an hour, i.e. put it on the screen. Not anymore? The data in the digital stream is not used by all TVs when you just tune to a station. This morning I was receiving KRCR on 7 but my TV said it was KGO.

Chuck

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post #10871 of 10872 Old Yesterday, 09:18 PM
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http://en.wikipedia.org/wiki/Station...#United_States

Quote:
Originally Posted by
Another way a television station can transmit its legal identification is to do it continuously by putting readable text in the vertical blanking interval
In Googleing TSID earlier I discovered that the TSID was specified for analog transmissions.

KNTV's TSID for analog was 396, the Digital TSID is 397.

http://licensing.fcc.gov/cgi-bin/ws....ility_id=35280

SHF
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post #10872 of 10872 Old Today, 12:43 AM
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Quote:
Originally Posted by Calaveras View Post
Over the years I've been accumulating the identifications of most of the stations I've received here. I made a simple web page listing all the stations linked to an image.

http://www.aa6g.org/OTA_TV/otatv.html
Beautiful job, Chuck! I've gone through the first 20 channels, but plan to go back and look at the rest later on.

Quote:
Originally Posted by Calaveras View Post
They're listed by virtual channel. Some of the IDs are not what I really wanted but some stations refuse to identify with a call sign and/or channel number. I noticed that KNTV never shows KNTV 11, just Bay Area NBC. Don't they have to identify once an hour? I'm only completely missing KCNS which I just overlooked. Next time it's in I'll get it. If it's not on my list then I have not received it.

Chuck
I noticed that KNTV introduced a new ID recently where they now identify themselves as "Channel 11, Cable 3 and 703"
KOFY has been showing their cable ID as 713 now.

I'm not sure what the FCC ID requirements are now. Maybe the PCIP is a legal ID. I know in the analog days we had to show a visual ID on the hour, or close to the hour during a normal break in programming. I remember having to super the KGO ID for three seconds on the hour during programming such as sports where there wasn't a break near the hour. I have noticed that KPIX and KNTV super their ID at various times now. KNTV does it frequently during the start of the late night shows.

Larry

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