Portland, OR - HDTV - Page 297 - AVS Forum | Home Theater Discussions And Reviews
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post #8881 of 8895 Old 02-22-2019, 10:53 AM
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First of all, with marginal signals, TV tuners vary. One tuner will decode what another tuner cannot. I have two set-top boxes and a TV set in my lab. hooked up to the same antenna and with the same signal amplitude. With marginal signals, the TV set and one of the set top boxes will often not decode signals the other set top boxes will.

Be aware that with DTV, if the set can decode the signal at all, the picture is likely to be perfect. There is a very narrow zone when the signal will pixilate and the sound will break up so this rule is not absolute. This feature of DTV often makes trouble shooting reception problems very difficult. You can be sitting on the very edge of decoding failure and not know it.

As for the stations you mentioned, KUNP-LP transmits virtual channel 47.x on RF channel 34. I am ~9 miles from the station and my records show it's amplitude has been essentially constant for weeks. Signal reception can vary if the transmitter starts distorting (not likely, but possible) or if the trees and growing stuff in the path vary the path loss. At my close in site, I have seen 1 or 2 dB of signal increase as the leaves fell off of the trees (at least I think that's the cause). Also, storms apparently causing wet trees to wave in the path can cause decoding problems. Even at my close-in site I have sat and watched the signal amplitude of the local DTV stations vary several 3 or 5 dB as the wind blew. In marginal conditions, a 1 or 2 dB change can cause signal loss. I'm a little surprised that you can receive this signal in Salem. The coverage maps show the signal is pretty iffy there.

You also mentioned ch. 41 and ch 15. KOXO-CD used to be on RF41 and used a virtual channel ID of 41.x. Many months ago, it moved to RF channel 15 but continued to use the virtual ID of 41.x. In mid February it dropped that ID and used an ID of KOXI-CD virtual 20-1. (To add to the confusion, at the same time, the actual KOXI-CD RF ch. 20 using a virtual 20-1 was also transmitting). Checking this morning, I note that the transmitter on RF 15 is now IDing itself as KORS-CD virtual 16-1 (it should be using the call letters KOXO-CD). Using the wrong call letters is very odd and I assume it is part of the off the air too long problem I noted that the WatchTV stations have in my 2/18/19 posting to this site.

I am completely baffled by your mention of 38.1. That one I don't know.

Linley

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post #8882 of 8895 Old 02-28-2019, 04:52 PM
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Figured out that I was being misled by my old Artec set-top converter box. When I scanned my Sony Trinatron HDTV set with its diagnostic mode, all five of WatchTV's stations show up on the virtual channel list. That is KORS-CD 16.1, KOXI-CD 20-1, KORK-CD 35-1, KKEI 38-1 and KOXO 41-1 are on its channel list.

When tuned to a given virtual channel, the Sony set's diagnostic mode shows what RF channel the set is tuned to. It says that KORS, KORK and KKEI are virtual channels on the KOXO RF channel 15 transmitter. KOXI is properly being transmitted from WatchTV's RF channel 20 transmitter and KOXO's virtual 41-1 is correctly emanating from its RF channel 15 transmitter. This agrees with spectrum analyzer measurements that show only RF channel 15 and 20 of WatchTV's five Portland channels have signals in them.

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post #8883 of 8895 Old 03-04-2019, 09:22 AM
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After reading your post, I took time this morning to see what the Magnavox DVR was receiving for the lower powered stations and found the following (note that some of these line up with your recent findings):


"Channel Not Available" on 3.2, 12.5, 17.3, 17.4, 27.2, 37.2 and 49.6.



Otherwise, 10.5 = 10.1, 10.6 = 10.2, 10.7 = 10.1, 10.8 = 10.4; 12.4 = 12.1, 12.6 = 12.1; 15.3 = 17.1, 15.4 = 17.1; 16.1 = 17.1; 20.1 = 17.1; 36.3 entirely blank as was 36.4 although 36.1 and 36.2 were fine; 38.1 = 17.1; 47.1 through 47.3 were fine; 49.5 = 49.1, 49.7 = 49.1


I've received the 47.x channels for a few years, well before the repack RF channel change. Just took a look at the 36.x channels again and find there indeed is signal strength on .3 and .4--just no video. Also, seems KWVT 17.1 and the WatchTV stations simulcasting its programming are all showing just the station ID bug in the lower right corner. No problem on 17.2 weather channel. Some of the channels listed above such as the 12.x and 49.x channels must be the translators as my channel advance button didn't stop on any 18.x or 19.x channels but manually entering them took me to a 12.1 or 49.1 channel. Neither of the translators carrying the 12.x and 49.x diginets or so it appears. Also just checked the Toshiba TVs in the house and they're all now picking up the 47.x channels so maybe there is hope for the Sony tuner to again receive them.
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post #8884 of 8895 Old 03-11-2019, 09:48 PM
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KOXO-CD RF ch. 15, virt. ch. 41 is off the air tonight.


There is a new on-line TV signal monitoring receiver that can be viewed at: https://m.rabbitears.info/index.php?...107241E4&tno=3 .


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post #8885 of 8895 Old 03-14-2019, 07:59 PM
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KOXO-CD RF ch. 15, virt. ch. 41 is back on the air today.


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post #8886 of 8895 Old 03-20-2019, 05:37 PM
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KKEI-CD (RF38, vir.38) began transmitting yesterday.


At the same time KOXO-CD (RF15, vir.41) ceased transmitting.


One cannot be sure, but the two events are probably coupled.


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post #8887 of 8895 Old 03-29-2019, 09:19 PM
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KEVE-LD, RF36, Vir36 has been off the air for four days now. I delayed posting to make sure it wasn't just a small problem. Don't know if it's a big problem or if they are in the process of moving to RF31. Their RF36 transmitter had a long history of periodically tripping off the air and recycling.


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post #8888 of 8895 Old 04-06-2019, 11:19 AM
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KATU Repack update:
http://www.katuengineering.com/hesk/...php?article=49
Quote:
3/14/2019 UPDATE:

Viewers may notice a promo talking about the need to "re-scan" on or after 4/12/2019. That is the tentative date that we hope to move to our new frequency. When this happens, viewers will need to re-scan to receive our signal. This will also mark the move to a lower-power transmitter where our station will live until the old full-power transmitter and antenna are replaced.

As part of an FCC-mandated change to the television broadcast frequencies which broadcasters use, KATU and other stations in the market will be making changes from 2018 through 2020 that will temporarily impact viewers.

As a result of this mandated change, we will be taking advantage of this situation to make much needed improvements to the transmitter and antenna systems we use to bring you programming.

Historically, reception for viewers in some areas has been particularly sensitive to changes in the weather. This has been especially bad as the weather warms up. The reason for this is an antenna and transmission line design problem with the systems on our transmission tower at Sylvan Hill. It has been this way since the Sylvan Tower systems were built back in the year 2000.

In the coming months we are going to completely replace the entire KATU, KOIN and KRCW transmission systems. We are confident that once the work is done our broadcast pattern will be much better without the dead zones that we are experiencing now.

Our new system will be on a different UHF channel. The first step is to install a temporary alternate low power transmitter on our new channel. For some viewers, this will provide immediate improvement, especially if you are located close in town. Viewers in remote areas will be impacted due to the lower power output, however. Once we have moved to the low power transmitter, users may need to rescan for channels in order to receive them.

Once on the new channel with the temporary low power transmitter we will begin the demolition of the old system at Sylvan Hill and then install a new full power system there on our new channel.

We expect once the work is completed, the reception problems that plague Portland and surrounding communities will be a thing of the past.

This is a multimillion dollar project that has been in the planning stages for years.

When done we expect our past transmission problems will be over with the new system able to provide much better reception for those within its reach.

In the meantime, we thank you for your patience as we work through this project.

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post #8889 of 8895 Old 04-08-2019, 08:15 PM
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KEVE-LD RF36 returned to the air Saturday afternoon. Its still experiencing periodic carrier trips.


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post #8890 of 8895 Old 04-12-2019, 09:39 PM
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KKEI-CD has moved from RF38 to RF36. This is its repack channel assignment. It's transmitting several virtual channels, most of them end up being crazy numbers on my set; numbers like 38.1025, etc. At my house, it presents a beautiful spectrum with virtually a textbook shape (i.e. reflection free) for the in-channel portion of its spectrum.


The station, KEVE-LD, that used to be on channel 36 is off the air, at least for the time being. It has a construction permit for RF31 but has not appeared there yet.


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post #8891 of 8895 Old 04-23-2019, 02:25 PM
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If you are suddenly having problems receiving KMNT (RF45 Vir24), it has sharply dropped in power. Last night and today it's down 19 dB in amplitude while all the other Portland DTV stations remain essentially constant (i.e. it's them, not me).


I don't know why. Their STA filed last Friday to reduce their ERP to allow an antenna change for their repack shift to RF34 has is still pending. Something else must be going on.


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post #8892 of 8895 Old 04-23-2019, 10:06 PM
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KWVT-LD on the air tonight on RF11 in Portland. It has five virtual channels: 3-1 KVDO, 17-1 KWVT, 17-2 Weather, 27-1 KSLM and 37-1 Azteca.

Also tonight, KOIN RF25, Vir6 has gained about 7 dB in amplitude since yesterday. Reading vary a bit from day to day so the exact change may vary a bit but the power is quite noticeably greater. That should help reception.


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post #8893 of 8895 Old 04-24-2019, 04:05 PM
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KATU RF43, Vir2 lowered its power substantially today in order to allow construction of its new antenna system. See http://www.katuengineering.com/hesk/knowledgebase.php?article=49 for details.


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post #8894 of 8895 Old 05-11-2019, 09:44 PM
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KKEI-CD RF36, Vir ch. 38 has been 25dB lower than its accustom power when I checked the last three nights. That is if its ERP was 8.6kW as rated, it's down to about 30 Watts now. Being low more than a day or two probably means a bigger glitch than normal. Perhaps the Final amp is down and we are seeing the driver feed-through.


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post #8895 of 8895 Old 05-14-2019, 10:03 PM
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KKEI-cd is up to full power again tonight.


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