Portland, OR - HDTV - Page 294 - AVS Forum | Home Theater Discussions And Reviews
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post #8791 of 8906 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 8906 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 8906 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 8906 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, 32 views)
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post #8795 of 8906 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 8906 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 8906 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 8906 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.


Linley
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post #8799 of 8906 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 8906 Old 06-07-2017, 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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post #8801 of 8906 Old 07-08-2017, 08:33 PM
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I haven't checked Portland's TV spectrum for several days. This afternoon, when I checked, there is an ATSC 3.0 signal on channel 20 again. The other four WatchTV stations are still silent.
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post #8802 of 8906 Old 08-17-2017, 09:46 PM
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The STA giving WatchTV authorization to transmit an ATSC 3.0 signal expired on August 14th. A search of the FCC's site indicates an extension of that STA (Special Temporary Authority) was refused on May 17th. At this writing, (August 17) there is still a low power ATSC 3.0 signal (38 dB below 1MW channel 22 or about 200 Watts or so) on the air (I am assuming this transmission is from KGW's tower and not at the site east of Vancouver shown on the STA document.) All of the other four WatchTV Portland stations have been and still are silent even though they filed a document with the FCC on July 3, 2017 that they had all been on the air 18 hours a day for the last three months.


The channel 20 ATSC 3.0 signal was apparently at full power (9 kW ERP) from about the first of July until some time near the last of July or early August when it fell to the current low power setting. I did not catch it when this change occurred.


KYJJ-LD ch 24 also has been off the air for some time. It was back up for a short time near the end of July but has gone silent again.
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post #8803 of 8906 Old 08-21-2017, 11:39 AM
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As of yesterday (Sunday, August 20, 2017), KOXI-CD is transmitting an ATSC 3.0 signal at high amplitude again.
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post #8804 of 8906 Old 08-31-2017, 05:35 PM
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In the continuing saga, KOXI-CD, ch. 20 continues to transmit an ATSC 3.0 signal. But, since Sunday, August 28th, it has reverted to its low power mode.
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post #8805 of 8906 Old 12-19-2017, 02:20 PM
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Moving to Bull Mountain - Antenna Suggestion

We will be moving to the Bull Mountain area in a couple of weeks. The house is 2-story so I'd like to put an antenna in the attic space. Where we are moving from we had a rooftop mounted antenna on a single story that worked perfectly for well over 30 years. This is our first 2-story home so I'd like to try using the attic space. I've attached our TVFool report for the new address.
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post #8806 of 8906 Old 12-19-2017, 11:02 PM
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Welcome to Tigard! I moved from SJ to Bull Mtn 21 years ago. I laid a Silver Sensor antenna on the floor behind my TV stand and got great reception without ever moving it. And the TV was on the south wall on the first floor of a 2 story home. The line of sight to the towers to the north is perfect. Never had to use an external antenna. I did just use it as a back-up whenever my cable (Verizon then Frontier) went out, which was rare. You should have no problem with an attic installation.
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post #8807 of 8906 Old 12-20-2017, 08:57 AM
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Welcome to Tigard! I moved from SJ to Bull Mtn 21 years ago. I laid a Silver Sensor antenna on the floor behind my TV stand and got great reception without ever moving it. And the TV was on the south wall on the first floor of a 2 story home. The line of sight to the towers to the north is perfect. Never had to use an external antenna. I did just use it as a back-up whenever my cable (Verizon then Frontier) went out, which was rare. You should have no problem with an attic installation.
Thanks! So if I do want to install in the attic space you'd recommend a Sliver Sensor? I really don't want to pay Dish (the house already has a Dish installed) or Comcast to get just the local stations because we stream everything else.
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post #8808 of 8906 Old 12-20-2017, 12:01 PM
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Originally Posted by Otto Pylot View Post
Thanks! So if I do want to install in the attic space you'd recommend a Sliver Sensor? I really don't want to pay Dish (the house already has a Dish installed) or Comcast to get just the local stations because we stream everything else.
I don't know if Silver Sensors are still available anywhere but there's a vast collection now of indoor HD antennas that should provide equal reception quality. I should have emphasized the location of your house on Bull Mtn. may affect the quality of receptiuon from an attic antenna. I am on the north side of the hill facing directly at the transmission tower array in the West Hills with an uninterrupted view except for the walls of my house and the house just downhill from us. Good luck!
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post #8809 of 8906 Old 12-20-2017, 01:05 PM
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Quote:
Originally Posted by ridgefamus View Post
I don't know if Silver Sensors are still available anywhere but there's a vast collection now of indoor HD antennas that should provide equal reception quality. I should have emphasized the location of your house on Bull Mtn. may affect the quality of receptiuon from an attic antenna. I am on the north side of the hill facing directly at the transmission tower array in the West Hills with an uninterrupted view except for the walls of my house and the house just downhill from us. Good luck!
I'll see what the locals have to say down here based on my TVFool plot. We seem to have LOS and are on a small rise in the neighborhood so we're a tad bit higher than the house across the street and seem to be able to see the mountains clearly from where we are. Wherever we are is. Thanks.
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post #8810 of 8906 Old 03-14-2018, 03:22 AM
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Can someone here tell me what they're seeing on RF41? Is it just 41-1, or is there other programming as well?

- Trip

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post #8811 of 8906 Old 03-14-2018, 06:08 AM
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Quote:
Originally Posted by Trip in VA View Post
Can someone here tell me what they're seeing on RF41? Is it just 41-1, or is there other programming as well?

- Trip
On PDX 41-1 I get a 480 x 720 @ 29.970 station with infomercials. There are no other sub-channels on 41.

If I can get you any other info please let me know!
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post #8812 of 8906 Old 03-28-2018, 03:38 PM
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fcc at it again :-(

Sounds like the rocket scientists at the fcc have decided to throw away
yet another bunch of spectrum. :-(

Is it known what frequencies our fine stations will get moved to?
I reloaded the famous article 1 but it is very out of date.

I'm thinking about getting a real VHF-LO (and FM) antenna and am
wondering if I should worry about channels 2-4 or just 5 and FM.

Sometimes RF5 comes in perfectly (using a VHF-HI antenna) when
RF33 doesn't, thinking a real VHF-LO antenna might do better.
Should have gotten a VHF-LO antenna back when I got the other 2, but
thought that all the VHF-LO stations were going away. Problem
now is that some of the antenna choices have gone away. :-(
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post #8813 of 8906 Old 03-28-2018, 03:46 PM
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https://www.rabbitears.info/repackch...=&lss=&status=

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post #8814 of 8906 Old 03-30-2018, 04:32 PM
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Thanks, Trip, some useful info there.

So according to that URL, 8 10 12 16 20 22 30 33 35 are staying put.
40 -> 25 KOIN
41 -> 15 KOXO-CD WatchTV
43 -> 24 KATU
45 -> 32 KNMT Trinity
38 -> 36 KKEI-CD WatchTV

8vsb:15: ss=80 snq=0 seq=0 KOXO-CD WatchTV ATSC 3.0 already?
8vsb:16: ss=70 snq=0 seq=0 ATSC 3.0?
8vsb:20: ss=20 snq=0 seq=0 Down in the noise

Stations not listed, and I didn't find a way on that URL to query about a
particular station:

Ran a fresh channel scan yesterday morning and got the following diff:
< program 8vsb:42-1 42.1 KPXG-LD filter="0x0000 0x0030 0x0031 0x0034 0x0035"
---
> program 8vsb:42-1 42.1 KPXG-LD encrypted filter="0x0000 0x0030 0x0031 0x0034 0x0035"

A quicky 5 minute test recording had a normal picture and sound,
aside from breakups due to horrible reception (some religious fiction show).
Maybe the encryption is as fictitious as the program material?
8vsb:42: ss=80 snq=57 seq=0 reasonable signal strength but crap quality

RF5 signal quality is pretty low, but this is with a VHF-HI antenna, so...
8vsb:5: ss=79 snq=67 seq=100
program 8vsb:5-3 32.1 KRCW filter="0x0000 0x0030 0x0031 0x0034 0x0035"
program 8vsb:5-4 32.2 AntTV filter="0x0000 0x0040 0x0041 0x0044"
program 8vsb:5-5 32.3 ThisTV filter="0x0000 0x0050 0x0051 0x0054"

If KKEI-CD WatchTV @ RF38 is moving to RF36, what happens to the current RF36?
8vsb:36: ss=75 snq=88 seq=100
program 8vsb:36-1 36.1 KEVE filter="0x0000 0x01E0 0x01E1 0x01E2 0x01E3"
program 8vsb:36-2 36.2 BLBN-2 filter="0x0000 0x0060 0x0061 0x0064 0x0065"
program 8vsb:36-3 36.3 Hope TV filter="0x0000 0x03E8 0x03E9 0x03EA 0x1220"
program 8vsb:36-4 36.4 ETV filter="0x0000 0x1300 0x1320 0x1321 0x05DC"

8vsb:46: ss=78 snq=91 seq=100
program 8vsb:46-1 46.1 KGWZ-LD filter="0x0000 0x0030 0x0032 0x0033"

8vsb:47: ss=69 snq=84 seq=100
program 8vsb:47-3 47.1 KUNP-LD filter="0x0000 0x0030 0x0031 0x0034 0x0035"
program 8vsb:47-4 47.2 TBD filter="0x0000 0x0040 0x0041 0x0044"
program 8vsb:47-5 47.3 Charge filter="0x0000 0x0050 0x0051 0x0054"

8vsb:49: ss=79 snq=88 seq=100
program 8vsb:49-3 17.1 KWVT DT filter="0x0000 0x0030 0x0031 0x0034"
program 8vsb:49-4 27.1 KSLM TV filter="0x0000 0x0040 0x0041 0x0044"
program 8vsb:49-5 37.1 Azteca filter="0x0000 0x0050 0x0051 0x0054"
program 8vsb:49-6 3.1 KVDO filter="0x0000 0x0060 0x0061 0x0064"

And the garbage:

8vsb:57: ss=54 snq=0 seq=0 728-734 MHz
This is after a 700 MHz low-pass filter. Need a *very* serious filter
to knock this crap down.
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post #8815 of 8906 Old 04-01-2018, 01:54 PM
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I looked this morning and the only WatchTV station on in Portland is KOXO-CD, RF41, transmitting ATSC 1.0. The other four WatchTV stations (RF16, RF20, RF35 and RF38 are silent. There was an ATSC 3.0 signal on RF20 for several months through the f all and early winter but it went silent in early February at the same time KOXO-CD RF41 turned on for the first time in memory. My measurement noise floor is 30 dB below RF41 which says if the silent stations are on, their power is very low; 15 watts or less.


Interesting observation. Both KOXO-CD, RF41 and KPXG-LD are on the same tower (KGW). Both stations are licensed for 15 kW ERP. I am about 7 mi away from the tower at an azimuth of roughly 250d from that tower. The received spectrum of both stations is relatively flat indicating my antenna/distribution system is reasonably flat over that range. Yet, I receive RF41, 9 dB higher in power than RF42. I don't know why.


As for the welfare of KEVE-LD, RF36, the FCC provided no protection to low power (the -LD designation) stations in the repack. Thus KEVE-LD will have to leave the air or find a new allocation. This is terribly unfair in that until KOXO-CD turned on in February, none of the five WatchTV stations have been on the air in ATSC 1.0 for literally years while KEVE has been here all along.


I would be interested in knowing what equipment is being used to read the DTV's PSIP. I can measure the spectrum but cannot read the PSIPs.
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post #8816 of 8906 Old 04-01-2018, 01:58 PM
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I forgot to mention that to remove LTE signals above 700 MHz, the Channel Master model CM-3201 LTE filter is excellent. That is, if one can find one; Channel Master's site indicates that this filter is not in stock. Other jobbers perhaps?
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post #8817 of 8906 Old 04-03-2018, 04:58 PM
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> The other four WatchTV stations (RF16, RF20, RF35 and RF38 are silent.

The hdhomerun tuner says there is *something* on RF15 & RF16.
[ ss = signal strength, "pegs" at 100, overload is above 100,
how much above depends on which tuner revision ]

scan from 2018_04_01 1pm pdt:

8vsb:11: ss=12 snq=0 seq=0
8vsb:12: ss=88 snq=100 seq=100
program 8vsb:12-3 12.1 FOX 12 filter="0x0000 0x0030 0x0031 0x0034 0x0035"
program 8vsb:12-4 12.2 COZI-TV filter="0x0000 0x0040 0x0041 0x0044"
program 8vsb:12-5 12.3 Laff filter="0x0000 0x0050 0x0051 0x0054"
8vsb:13: ss=12 snq=0 seq=0
8vsb:14: ss=23 snq=0 seq=0
8vsb:15: ss=83 snq=0 seq=0
8vsb:16: ss=74 snq=0 seq=0
8vsb:17: ss=22 snq=0 seq=0
8vsb:18: ss=26 snq=0 seq=0
8vsb:19: ss=23 snq=0 seq=0
8vsb:20: ss=21 snq=0 seq=0

> Yet, I receive RF41, 9 dB higher in power than RF42.

Same here (15 "percent" is about 9 dB)
8vsb:41: ss=95 snq=69 seq=100
program 8vsb:41-1 0.0 filter="0x0000 0x0030 0x0031 0x0034 0x0035"
8vsb:42: ss=80 snq=61 seq=100
program 8vsb:42-1 42.1 KPXG-LD filter="0x0000 0x0030 0x0031 0x0034 0x0035"

Hmmm a marketing bs channel number of 0.0 which beats Caption Kangaroo's
channel 1. :-)

> I forgot to mention that to remove LTE signals above 700 MHz,
> the Channel Master model CM-3201 LTE filter is excellent.
> That is, if one can find one; Channel Master's site indicates that
> this filter is not in stock. Other jobbers perhaps?

The web page

http://www.channelmaster.com/TV_Ante..._p/cm-3201.htm

is crap. :-( Wading through the source, I found a URL for
what claims to be a spec sheet

http://downloads.channelmaster.com/S...spec+sheet.pdf

Frequencies Pass: 5 - 699 MHz
Frequencies Block: 700 - 2000 MHz
Input & Output Connector: F-type
Size: 2.375L x .75W x .75H in

No mention of what it does below 5 MHz or above 2GHz.
No mention of dB, much less an actual frequency response graph.
I guess they must have been too busy putting in logos of various
tv networks to include actual necessary specs. :-(
The filter itself might be good or bad, can't tell from their
pathetic marketing. Sorry Channel Master, no sale.

Besides, after the fcc finishes the latest spectrum throw-away,
we'll be needing 608 MHz low pass filters, not the current 700.
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post #8818 of 8906 Old 04-03-2018, 09:18 PM
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There is nothing in the spectrum at my house on channels 15 and 16. I use a >10 dB gain antenna with preamplifiers ahead of the spectrum analyzer achieving a system noise figure of perhaps 7 or 8 dB.


You might experiment by adding attenuation between your antenna and your receiver and see if the signals on those channels falls more than the added attenuation would create on its own.


As for the Channel Master filter, having personally swept three of them I know that they are excellent filters, especially for the money. A friend provided me with the description below when he both swept the filter and disassembled it to study its construction. He also sent a large (2.2 MB) pdf file with photos from his network analyzer that is too large for this site. If anyone is interested, write me at gumm at easystreet dot net for a copy.


And yes, a new version will be needed after all the TV stations move to their new channels and LTE moves into the 600 MHz band. A filter for this band could work even better because of the lower frequency and the fact that an empty channel 37 lies between the active UHF TV band and the new LTE band.


My friend's text comments:


________________________


Purchased two; one for de-construction purposes after testing and the second for testing and actual use.

The 50 to 1050 MHz swept output of the filter is attached. IL runs less than 0.5dB up to about 550MHz and then slowly tapers to 3dB down at 692MHz. Almost 5dB down at 698MHz. 72dB down at 749MHz.

De-construction:
Tubular construction is very tough to open
Rubber seals are on each end and these gaskets are entwined in the threads on each end
Neither end would not unscrew
Cut off ends with hacksaw
Found board with the expected multi-section LPF
PCD thickness = 0.064”
Cylinder is nickel plated brass
Ears punched out of the cylinder side wall support the PCB
The ground of the LPF circuit are soldered to these ‘ears’
There are 6 standard thur-hole solenoid coils on one side of the PCB, the ID of the coils was less than 0.125” ; maybe 3/32” ID.
There are 6 very small surface mount capacitors on the opposite side of the PCB

There appears to be two oblong portals (one above and one below the PCB); can be seen by looking at the inside surface. Perhaps these are for tweaking of coils or troubleshooting ports
Access to these portals could not be found on the outside

Everything is constrained by a very tight fit; very interesting mechanical construction. Not sure how they did it.


Circuit appears to be series L, shunt C, series L, shunt C, series L, shunt C, series L, shunt C, a series L in parallel with a C, and finally a series L.
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post #8819 of 8906 Old 04-04-2018, 10:52 AM
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When I posted yesterday, I was having problems with the AVS editor. After re-entering the same thing a couple of times, I became too terse. My commends about the tuner and attenuation are so obtuse that if you don't immediately know what I am talking about, the comments won't be understandable.


Since the spectrum at my house is so empty on ch 15 and ch 16, I theorized that the HD Homerun unit's tuner was perhaps being overloaded and creating interference internally. We who designed and used spectrum analyzers know this problem intimately. The way to sort out if the signal is real vs a signal being created in the receiver is to change the signal's amplitude and observe the apparent change in the suspect signal's amplitude.


Thus if, after inserting 10 dB of attenuation in the signal path I observe the suspect signal's amplitude fall by 10 dB, I am pretty sure it is a real signal. If, on the other hand it falls by 20 dB or even 30 dB I am pretty sure I am observing a signal being created in the receiver. The theory (which works most of the time) is that spurious signals created by simple sums and differences will fall 20 dB. Spurious signals created by third order intermodulation (i.e. 2X one signal plus/minus 1X of another) will fall 30 dB.


You don't have to be paranoid to make good RF measurements, but it helps!
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post #8820 of 8906 Old 05-11-2018, 11:22 AM
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KOIN has a transmitter operating on channel 25, its post re-pack channel. It currently has a 1080i signal with a static display of color bars plus a KOIN-TV ID logo. This transmitter is operating from the old KATU tower just south, down the hill, from KGW's tower. The plan they filed with the FCC is to operate from this tower at lower power during the period that the new antenna, one suitable for the post-repack channel, is mounted on it's main tower.


KOIN has a construction permit for this move and has filed for a STA to operate on the new channel at reduced power. It seems reasonable that KATU and KCRW, the other users of KOIN"s antenna would also operate temporarily from the old KATU site but I have been unable to find any construction permit for them. KATU's filed transition plan includes hardware for such a move so we will just have to wait and see. KOIN is starting to advertise that one will need to re-scan your TV set on June 1.


KOXO is also asking the FCC to transition to its new channel on June 1 but the FCC hasn't acted on this request yet.
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