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Topic # 224283 10-Nov-2017 13:44
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I have been doing a lot of work on Sky alternatives recently and I keep running into frustrating problems that shouldn't be happening. The latest is very bad pixelation and picture break-up on UHF reception of TV1 and TV2. Our UHF comes through a high-gain antenna on a very high mast from the Mt. Erin Freeview transmitter. We don't have line of sight as there is a hill in the way but until today picture quality has always been excellent and dependable. Today it is very windy and reception has gone to hell for the first time ever, but apparently only on the TV NZ channels. I checked Three and Prime and they seem fine. 

 

I am left wondering if this is a problem at our end or not. If it is, it is going to be a real hassle. Is anyone else experiencing this? Could it be something with the transmitter or a feed? I can see our antenna moving around a little in the wind and the long coax cable also moving a bit (nothing major) but as stated, we only seem to be getting issues with TV1 and 2. I haven't checked the other TV NZ channels. Could it be frequency-related? We have had the antenna set-up for years though we haven't used it much in the past. This is the first time I have ever seen anything like this. How can I tell what is causing this?

 

 





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  Reply # 1899219 11-Nov-2017 11:53
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Yes it's possible the transmitter / transmitting aerials are developing a fault. You could use the signal quality and strength meters of your receiver to check TV NZ channels and compare to others.

 

Rest assured if it is a transmitter fault the appropriate people (Kordia perhaps) will attend to it asap. Have you had a look on the Kordia web site for any known issues?


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  Reply # 1899230 11-Nov-2017 12:32
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Is your aerial solid as, i.e. fixed well, nothing loose, nothing rusted and are all the cable connections solid. 

 

 


 
 
 
 




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  Reply # 1899241 11-Nov-2017 13:22
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Goosey:

 

Is your aerial solid as, i.e. fixed well, nothing loose, nothing rusted and are all the cable connections solid. 

 

 

 

 

As far as I can tell it is. The mast is a DIY job, two solid pipes welded end to end. It is firmly anchored to an unused chimney. It moves back and forth a little in strong wind, but nothing major. The cable connections were solid when I made them. It has been a few years but I don't think they have deteriorated. I can't check them close up. The cable is anchored to the mast part-way down to avoid jiggling the connection and seems fine. I have never had issues before and as I said, other channels seem to be normal. This is why I wondered if it could be at the transmitter end.

 

 





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  Reply # 1899264 11-Nov-2017 14:59
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I took another look at this and am still having the same problem. Frequent but not continuous bad break-up and pixelation of channels on TV NZ mux only. Other muxes seem okay. May be wind-related but I can't establish a clear link. Nothing about this on Network status site so I have to assume it is at my end. The only problem is that the connection to the antenna is virtually unreachable and I'm not sure what I would do with it if I could reach it.

 

Question: We are in a poor reception area and should not be able to get a signal at all. We don't have line of sight and we could only get reception by elevating the antenna a long way above the roof. Even then, there is still a hill in the way. Our signal has always been strong and steady, but from reading I did at the time, I believe we were probably picking up a signal bounce of some kind. There is no way we can see the transmission mast. So could small movements of the antenna elements in the wind cause this kind of thing? Does it have to be a bad connection?

 

 





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  Reply # 1899272 11-Nov-2017 15:35
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No it doesn't have to be a bad connection.
If you're in a poor reception area its common for this to happen.Check the quality levels on all muxes,TVNZ is probably the weakest, and the rest are maybe just above the threshold. A masthead amp is your best bet if there is no better spot on the roof.

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  Reply # 1899584 12-Nov-2017 13:22
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A photo or even better a video of the antenna swaying in the breeze? would be a help.

 

 




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  Reply # 1899586 12-Nov-2017 13:30
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At the moment the breeze isn't blowing, but even when it is, there isn't a lot of movement. Enough to be visible, but only barely. I was just wondering if slight movement of the elements could be enough to affect the picture at this frequency. On reflection, I doubt that is the case but I don't really know. I think what the above poster says is probably more likely, a marginal signal that is tipping over the edge.

 

 

 

 





I reject your reality and substitute my own. - Adam Savage
 


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