Portland, OR - HDTV - Page 294 - AVS Forum | Home Theater Discussions And Reviews
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post #8791 of 8800 Old 03-20-2017, 02:51 PM
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looks like there has been a change in whats avail on Kunp Ch 47
16.1 KUNP-LD
16.2 TBD http://en.wikipedia.org/wiki/TBD_(TV_network)
16.3 Charge! http://en.wikipedia.org/wiki/Charge!_(TV_network)

and a change on Kpdx ch 49
49.1 KPDX-TV
49.2 Escape http://en.wikipedia.org/wiki/Escape_(TV_network)
49.3 Bounce TV http://en.wikipedia.org/wiki/Bounce_TV
49.4 Grit http://en.wikipedia.org/wiki/Grit_(TV_network)

Last edited by skihoodoo; 03-20-2017 at 03:53 PM.
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post #8792 of 8800 Old 03-25-2017, 07:33 PM
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KUNP-LD's use of virtual channel 16.1 is odd. I thought that virtual (and RF) channel was in use in Portland by KORS-CD ch. 16.
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post #8793 of 8800 Old 04-08-2017, 09:47 PM
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Tonight, at least, KUNP-LD (RF channel 47) is transmitting virtual channels 47.1, 47.2 and 47.3. I didn't stop to figure out the program content being sent on those channels.


To make life interesting, KVDO (RF channel 49) is transmitting virtual channels 3.1, 17.1, 27.1 and 37.1.
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post #8794 of 8800 Old 04-15-2017, 08:19 PM
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WatchTV Portland Stations

WatchTV, Inc. has licenses for five Portland area Stations:

KORS-CD ch. 16
KOXI-CD ch. 20
KORK-CD ch. 35
KKEI-CD ch. 38
KOXO-CD ch. 41


The -CD tag on the call letters indicates that these are lower power Class-A TV stations. As such, every quarter the station's operator must certify that the station(s) were on the air 18 hours per day, every day of that quarter. The attached file is the certification letter that the stations' chief engineer uploaded to the FCC six days ago on the 9th of April.


The problem is that a friend and I have monitored these five channels daily over the month of March and did receive any of them at any time. Let me explain that we both are near the WatchTV stations' transmitter site on KGW's tower (he; ~15 miles, me; ~7 miles). We both use outside antennas with preamplifiers (mine; carefully padded to keep it out of overload, his; padding not needed) and we both use spectrum analyzers to measure the signals. In my case, by comparing the noise floor of my measurement ability with the known power of signals emanating from the same location and nearly the same frequency as WatchTV's antenna, I am confident that if there was a signal from WatchTV's antenna it was is less than a few watts in power.


My friend and I periodically measure Portland's TV spectrum. Except for a period of about a week last July when KORS-CD ch. 16 was on at low power showing only a static color-bar display, we have not observed any of these stations on the air for the last year or more. In October of 2015 I asked on this site if anyone had ever observed any of these stations and received no reply. After noting the continued absence, we monitored WatchTV's channels carefully through the month of March (my friend 2 to 4 times a day, me every other day or so). We saw no signals over the month of March.


The bottom line is that these five WatchTV owned stations have apparently been silent for some time; it's for sure they were silent throughout the month of March 2017. Yet they filed a certificate with the FCC that they are on the air 18 hours per day from January 1 to March 31.


All in all, it seems very odd.
Attached Files
File Type: pdf class-a-eligibility-1q2017-20170410-162026134-pdf.pdf (30.7 KB, 25 views)
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post #8795 of 8800 Old 04-18-2017, 06:39 PM
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looks like some stations in Portland are moving after the spectrum auction

New Curr
CH CH Callsign City of License Operator
08 08 KGW PORTLAND, OR Tegna
10 10 KOPB-TV PORTLAND, OR Oregon Public Broadcasting
12 12 KPTV PORTLAND, OR Meredith
15 41 KOXO-CD PORTLAND, OR WatchTV
16 16 KORS-CD PORTLAND, OR WatchTV
20 20 KOXI-CD PORTLAND, OR WatchTV
22 22 KPXG-TV SALEM, OR Ion Media Networks
24 43 KATU PORTLAND, OR Sinclair
25 40 KOIN PORTLAND, OR Nexstar Broadcasting
30 30 KPDX VANCOUVER, WA Meredith
32 45 KNMT PORTLAND, OR Trinity Broadcasting
33 33 KRCW-TV SALEM, OR Tribune
35 35 KORK-CD PORTLAND, OR WatchTV
36 38 KKEI-CD PORTLAND, OR WatchTV
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post #8796 of 8800 Old 04-22-2017, 01:35 PM
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ATSC 3.0 In Portland

WatchTV's KOXI-CD is on today (apparently at full power) transmitting what appears to be an ATSC 3.0 signal. The signal's spectrum appears "squarer" than the standard DTV signal (i.e., ATSC 1.0), has no pilot and has short intervals of a narrower spectrum that would correspond to ATSC 3.0's boot up interval. This is the first day of the TV industry's giant NAB show in Las Vegas so the time is ripe for an ATSC 3.0 demonstration. The WatchTV stations are slated for an ATSC 3.0 demonstration this summer. First time I have seen one of WatchTV's transmitters on the air since last July.
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post #8797 of 8800 Old 04-27-2017, 02:32 PM
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Weingard PR-8800 less than 5 miles south of transmitters.

Wrote a program to find data in the log files.

RF16:
2010_02_28
8vsb:16: ss=75 snq=75 seq=100
program 8vsb:16-1 16.1 HSN filter="0x0000 0x0030 0x0031 0x0034"
program 8vsb:16-2 16.2 Bohemia filter="0x0000 0x0040 0x0041 0x0044"
program 8vsb:16-3 16.3 A1 filter="0x0000 0x0050 0x0051 0x0054"

2010_05_10
8vsb:16: ss=76 snq=75 seq=100
program 8vsb:16-1 16.1 HSN filter="0x0000 0x0030 0x0031 0x0034"
program 8vsb:16-2 16.2 A 1 filter="0x0000 0x0050 0x0051 0x0054"

2010_05_26 and all scans since, except for 1 day
8vsb:16: no signal

2016_01_01
8vsb:16: ss=99 snq=0 seq=100
No program listing, just a report of *something* on RF 16.

RF 20 no signal, ever
RF 35 no signal, ever
RF 38 no signal, ever
RF 41 no signal, ever
----------------------
A different tuner (different demod chip) found *something* on RF20 *once*:

2017_04_20
8vsb:20: ss=93 snq=0 seq=0

and *something* on RF16 some times, seems to be there with an amp, but not without an amp:

2011_07_21 ~07:12am no amp
8vsb:16: ss=24 snq=0 seq=0
2011_07_21 ~07:39am with amp
8vsb:16: ss=93 snq=0 seq=0

ss=24 is down in the noise, 93 is a pretty good signal strength level.
Hmmm, 24->93 should be approx. 41 dB, but the amp only claims 13 dB. Very strange.
Again. no program listing, just a report of *something* being there.
----------------------
> ATSC 3.0 signal

Oh goodie, we all get to buy all new tuners, *again*. And the stations will continue
to compress things until it looks like they were shot on 4mm Kodalith, hide what we're
attempting to watch under useless overlays, generate incorrect data streams, and transmit
crappy signals. :-(

> The signal's spectrum appears "squarer" than the standard DTV signal

Perhaps you'd care to post some pngs of this fine SA output? (And of the various 1.0 stations as well.)
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post #8798 of 8800 Old 05-08-2017, 08:29 PM
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Here are spectrum analyzer photos of the RF spectrum of an ATSC 1.0 (ch.22) and an ATSC 3.0 transmitter (ch. 20). (I externally attenuated the ch. 22 signal to the same amplitude as the ch. 20 signal to allow a 1 on 1 comparison) . The ATSC 1.0 signal has a pilot while the ATSC 3.0 signal does not. The "ears" 37+ dB down on the shoulders of the ATSC 1.0 signal are IM artifacts created in the transmitter. They are just nicely within the FCC's emission mask and are quite reasonable in a 1 MW ERP transmitter. The ATSC 3.0 transmitter is much cleaner but it is running at much lower power.


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post #8799 of 8800 Old 05-21-2017, 05:15 PM
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The channel 20 ATSC 3.0 transmitter seems to have gone off of the air. In fact all five of the WatchTV Portland stations are silent.
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post #8800 of 8800 Old Today, 02:24 PM
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Quote:
Originally Posted by LinleyG View Post
In fact all five of the WatchTV Portland stations are silent.
Given that most of the WatchTV stations are operating under a special temporary ATSC 3.0 license that expires in August, this kind of (in)activity is probably to be expected. Apparently some of the testing is related to the "cellular" style DTS system. There was also talk of trying out channel bonding.

http://www.tvtechnology.com/atsc3/00...dts-sta/280385

Of course the real issue is testing ATSC 3.0 in an environment with geographical features as Raleigh and DC are relatively "topographically deficient".
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