reception issue

Reception, channel detection, network issues, CableCARD setup, etc.
chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

reception issue

Postby chuga » Mon Dec 17, 2018 10:21 am

Hi,

Lately I have been having trouble with reception from one antenna. I have two antenna in the attic
1) A DB4, facing roughly south to capture CBS/ABC/FOX
2) A DB2, facing northwest to capture NBC mostly.

Each antenna is run to a separate HDHR Extend (HDTC-2US). No amplification. Both are using latest firmware according to myhdhomerun (20180817)

When I set this up a bit over 1 year ago signal strength was acceptable but over the last few months I noticed the NW facing antenna signal was terrible (trying to watch NBC). I just went in the attic half expecting to see the antenna had fallen over or something but it was OK. I moved it around while monitoring with the signal strength app but it did not improve.

see attached for my TVFool report - the tower is only 30miles away so I would not expect any issue.
http://www.tvfool.com/?option=com_wrapp ... e2d8cf340f

any ideas on what could be wrong or how to troubleshoot?
is a DB2 the wrong antenna for the NBC tower?
do I have some type of co-channel issue with channel 31/CW


thanks

jseymour
Posts: 371
Joined: Sat May 12, 2018 8:46 am

Re: reception issue

Postby jseymour » Mon Dec 17, 2018 10:45 am

More information needed. E.g.: What do you mean, exactly, by "the NW facing antenna signal was terrible"? Have you looked at the station's signal level and quality, and symbol quality? What do they average?

A good place to check on local station issues is to find your market in AVS Forum Local HDTV Info and Reception and check the relevant thread.

chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

Re: reception issue

Postby chuga » Mon Dec 17, 2018 10:48 am

Hi,

For the WXII-TV (NBC) it is

strength 35%
quality 65%
symbol quality 100%

jseymour
Posts: 371
Joined: Sat May 12, 2018 8:46 am

Re: reception issue

Postby jseymour » Mon Dec 17, 2018 11:55 am

Hi,

For the WXII-TV (NBC) it is

strength 35%
quality 65%
symbol quality 100%
Yeah, that signal strength and quality definitely ain't gonna cut it. Do you know what they used to be?

Here's the AVS Forum thread for your market: AVS Forum | Home Theater Discussions And Reviews > HDTV > Local HDTV Info and Reception > Greensboro, NC - HDTV

A quick search didn't throw up anything informative, so you'd have to do more digging. I'd sign up at AVS Forum and ask in that thread of something happened with WXII a month or so ago.

chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

Re: reception issue

Postby chuga » Mon Dec 17, 2018 12:59 pm

I think NBC used to be ~80s for signal strength, so a significant change.

ebo
Posts: 511
Joined: Thu Jan 07, 2010 6:58 pm
Device ID: 1016F746, 101C8CF9, 1041F134, 10532394

Re: reception issue

Postby ebo » Tue Dec 18, 2018 12:35 am

How's your reception of WUNL (PBS)? It's essentially the same location as WXII and also close in frequency (RF 32 compared to RF 31). TV Fool says WXII is on RF 16 with WCWG (CW) on 31, but RabbitEars says both are on 31 and the TSReader data from 6/23/2018 confirms that. They'll move to 16 in the repack, scheduled for 2020. Maybe WXII was on 16 but moved in with WCWG, causing a difference in your reception. Did your reception of WCWG change? Or was it always poor?

These STA request documents could be a clue:
WXII-TV - Request for STA Exhibit.pdf
WXII-TV STA request for interim antenna ENG 03-30-2018.pdf

During tower work they'd have to reduce power or even shut down at times.

chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

Re: reception issue

Postby chuga » Tue Dec 18, 2018 5:55 am

I just tried CW ( channel 12.1 / 31), NBC (channel 12.1 / 31), and PBS (channel 26.1 / 32).
they all have similar reception with signal strength in the 30s, quality in the 50s, and symbol quality at 100%.

how can CW and NBC both be on channel 31?

oddly, when watching for a few minutes in the HDHR viewer app I was not getting any pixelation or issues...

If I were to replace the DB2 and try a new (more directional?) antenna what would be recommended?

thanks

ebo
Posts: 511
Joined: Thu Jan 07, 2010 6:58 pm
Device ID: 1016F746, 101C8CF9, 1041F134, 10532394

Re: reception issue

Postby ebo » Tue Dec 18, 2018 12:46 pm

I just tried CW ( channel 12.1 / 31), NBC (channel 12.1 / 31), and PBS (channel 26.1 / 32).
they all have similar reception with signal strength in the 30s, quality in the 50s, and symbol quality at 100%.
CW should appear as 20.1.
how can CW and NBC both be on channel 31?
The same way Me-TV and Bounce can also be on 31. One carrier can have multiple digital channels. The only restriction to the number is that they must share the total bandwidth (less than 20 Mbps) so adding more subchannels, especially HD ones, degrades the quality of all of them. There are devices that can help with that by creating a bandwidth pool to hand out extra bandwidth momentarily to subchannels as needed, provided they don't all need more at the same time. We will see more major network affiliates sharing broadcast channels as the repack progresses.

Wbmanx
Posts: 11
Joined: Fri Nov 30, 2018 11:07 pm

Re: reception issue

Postby Wbmanx » Wed Dec 19, 2018 4:43 pm

I just tried CW ( channel 12.1 / 31), NBC (channel 12.1 / 31), and PBS (channel 26.1 / 32).
they all have similar reception with signal strength in the 30s, quality in the 50s, and symbol quality at 100%.
CW should appear as 20.1.
how can CW and NBC both be on channel 31?
The same way Me-TV and Bounce can also be on 31. One carrier can have multiple digital channels. The only restriction to the number is that they must share the total bandwidth (less than 20 Mbps) so adding more subchannels, especially HD ones, degrades the quality of all of them. There are devices that can help with that by creating a bandwidth pool to hand out extra bandwidth momentarily to subchannels as needed, provided they don't all need more at the same time. We will see more major network affiliates sharing broadcast channels as the repack progresses.
Dude you are wrong! CW is on 20.1. It is not a subchannel. WXII is on 12.1 and MeTv is on 12.2. The WCWE (CW) and WXII (NBC)/METV are on different TV Tower. I am looking at on my IPAD app and Rabbit ears. We all know what subchannels are.

signcarver
Expert
Posts: 7818
Joined: Wed Jan 24, 2007 1:04 am
Device ID: 131B34B7 13231F92 1070A18E 1073ED6F

Re: reception issue

Postby signcarver » Wed Dec 19, 2018 5:26 pm

Dude you are wrong! CW is on 20.1. It is not a subchannel. WXII is on 12.1 and MeTv is on 12.2. The WCWE (CW) and WXII (NBC)/METV are on different TV Tower. I am looking at on my IPAD app and Rabbit ears. We all know what subchannels are.
Sounds like you don't know what subchannels are. To begin with the .1 makes it a subchannel even if it were on channel 20 which it isn't (hasn't been sine 2009 and hasn't been on 19 since 2017)... All of them should be on physical channel 31 (roughly 572MHz) WXII is 31.1 (the virtual (display) channel is 12.1) MeTV is on 31.2 (virtual 12.2), CW is 31.3 (virtual 20.1) bounce is 31.4 (virtual 20.2)

After the repack they will all be on physical channel 16

By the way, rabbitears does indeed state that they are all on 31

chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

Re: reception issue

Postby chuga » Thu Dec 20, 2018 6:00 am

If I were to try a new/different antenna any recommendations?

For example one of the GE ones (33692, or 29884 or 33685....).

or I could go with a larger DB4 (current have a DB2).

thanks

jseymour
Posts: 371
Joined: Sat May 12, 2018 8:46 am

Re: reception issue

Postby jseymour » Thu Dec 20, 2018 7:27 am

Again: I think it would be more productive to raise your question in a forum specific to your market: AVS Forum | Home Theater Discussions And Reviews > HDTV > Local HDTV Info and Reception > Greensboro, NC - HDTV

chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

Re: reception issue

Postby chuga » Thu Dec 20, 2018 7:39 am

thanks - I did post on that forum a few days ago but, as of yet, no reply.

jseymour
Posts: 371
Joined: Sat May 12, 2018 8:46 am

Re: reception issue

Postby jseymour » Thu Dec 20, 2018 2:04 pm

thanks - I did post on that forum a few days ago but, as of yet, no reply.
It's unfortunate nobody's seen fit to respond.

Problem is: I don' t know the DB2, I don't know your market, and I certainly don't know what may be up with the station in question. It could be they've dropped their power due to damage or preparation for the re-pack. Perhaps they're not even where TV Fool says they are.

Have you tried contacting the engineering department at the station? I think you need to understand why their signal plunged so badly at your location before you can make any reasonable move.

chuga
Posts: 27
Joined: Mon Jan 18, 2010 6:05 pm

Re: reception issue

Postby chuga » Fri Dec 21, 2018 2:04 pm

well I think I figured out the problem - not surprisingly it was the last thing I tried during troubleshooting.
steps take were:
1) assumed it was something with the reception so bought a different type of antenna (GE / Yagi)..took it back to walmart as it was missing parts. Went to Target and bought a RCA 7511. Tried that and still very poor reception to any channels in that direction.
2) tried aiming the antenna towards the south channels (like Fox 8.1) and still very poor reception
3) at that point thought maybe I have a bad coax or connector so tested the cable with a tester - no issues
4) switched the south facing DB4 to the NW facing coax and it did not work
5) wondered if it could be one of my HDHR boxes so switched my south facing HDHR to the NW antenna and it worked great!

So it is not the antenna/towers or cables. One of my HDHR does not work right...


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