DBT-T Lost all freeview channels

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Tel69

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Topic # 223036 9-Sep-2017 15:09

Hi all,

Got a bit of a weird one, I've got a new Panasonic TH-49ex600z (couple of weeks old) and it's been working fine, then all of a sudden in the space of 1/2 a night it lost prime (No signal),
Then it lost all the Mediaworks channels, then all TVNZ channels.
Doing a manual tune so I can check the channel quality the TV notes the quality on channel 32 for example is zero. Same for all the channels.
I've tried another areial outlet in the same room with the same result.
Move the TV to a different room, and all of a sudden it can pick up Mediaworks channels (Channel 32) with a quality of 2-4 out of 10.

Things I have noted, We have a X-Type Magna Phased array aerial which looks to be in a vertical polarity, but sugarloaf (Christchurch transmitter) broadcasts in a horizontal polarity.
Samsung TV's in the bedrooms have no issues getting all channels.
So it definately seems like the Panasonic is very picky but it has been working fine up until a few days ago.

So dodgy aerial/wrong polarity, possible dodgy splitter coupled with a picky TV are my thoughts.

Any other ideas?

Cheers
Terry

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Reply # 1861342 9-Sep-2017 15:35

Are you sure all those aerial sockets throughout your home are connected to the said external aerial?

Id check that first and are they being split at the mast with an amp or is a cable going somewhere first then splitting at a splitter?

Tel69

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Reply # 1861343 9-Sep-2017 15:45

Goosey:
Are you sure all those aerial sockets throughout your home are connected to the said external aerial?
Id check that first and are they being split at the mast with an amp or is a cable going somewhere first then splitting at a splitter?

Yup, I am indeed, they all go out to a splitter in the garage, All nicely labeled.
For the second aerial connection in the lounge I had to go out to the splitter and hook it up, cabeling was laid, but for some reason they had not hooked it into the splitter.
They probably thought I might want a sat dish connection for that aerial connection.

EDIT : Oh, and a brand new house so it all should be in tip top condition.

Tel69

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Reply # 1861351 9-Sep-2017 15:59

UPDATE: Samsung TV's in the bedrooms are now doing the same thing in the bedroom connections.
Only getting Channel 32 (Mediaworks) channels, finding nothing else.
As at last night they would get all channels from all muxes.

andrewNZ

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Reply # 1861356 9-Sep-2017 16:18

Been windy hasn't it? Has the aerial moved?

Location: Dunedin

Tel69

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Reply # 1861361 9-Sep-2017 16:37

andrewNZ: Been windy hasn't it? Has the aerial moved?

It has indeed been windy, went to look at that today and the aerial seems solid and has not moved, main aerial connection going into the house looks fine.
Mind you since this aerial is in essence 4 aerials wired into one connection going into the house I might go up on the roof and check the wiring between each of the aerials going into the main input into the house.
Well since we have a 6 month house inspection on Tuesday by the company that built the place for minor defects (I.E non urgent fixes, in essence anything not going to cause immediate damage to the house).
I might leave it to them and just add it to my list.
Naaaa, I'm interested , will climb up and just check the wiring on the aerials going into the main cable into the house.

EDIT : We have some new houses being built behind us (on the side of the house and in the direction the aerial is pointing).
The one right behind us has just had its roof put on and our aerial is low on our roof (Just up from the gutter).
Could the roof on the house behind us which is quite close have an impact?

Cheers
Terry

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Reply # 1861547 9-Sep-2017 20:32

Wrong polarity = signal halved -> non amplified splitter =signal halved again or worse, not to mention cable loss Plus new obstruction

Spyware

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Reply # 1861554 9-Sep-2017 20:52

Wrong polarity is more like a 20 dB loss.

Ross

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Reply # 1862729 12-Sep-2017 11:26

So, with that new house behind you... does this block the line of sight from your aerial to the TV transmitter? i.e. if your aerial cant see in clear view the mast on the hill (or wherever you are), then its likely this is the problem. I live near a massive block of new housing and I see some pretty stupid installations of TV aerials... i.e. wrong side of the house and trying to grab a signal it cant see.

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Reply # 1862809 12-Sep-2017 13:31

Goosey:

So, with that new house behind you... does this block the line of sight from your aerial to the TV transmitter? i.e. if your aerial cant see in clear view the mast on the hill (or wherever you are), then its likely this is the problem. I live near a massive block of new housing and I see some pretty stupid installations of TV aerials... i.e. wrong side of the house and trying to grab a signal it cant see.

Oh heck yes, the only thing the aerial can see is a big coloursteel roof.
(Aerial is down close to the gutter pointed straight at the house behind us and the new houses eve for the roof behind us is around 2 arm lengths away from our aerial).

Cheers
Terry

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Reply # 1862891 12-Sep-2017 15:39

Builders of the house came over, looked the issue and the main builder had a look of abject defeat seeing where the aerial was.
He looked like he had seen it before.
Strangely enough he said the aerial has to be moved.

Go figure.

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Reply # 1862917 12-Sep-2017 15:46

Hopefully you can get away with an extension pole, all depending on the height of their roof, how much slack you have in the cable and the weight at the top of the extension. Have a look at the mast extensions and you may need an adjustable stay depending on how much height you need.

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Reply # 1862932 12-Sep-2017 16:05

Well with a new house fortunately it is not up to me to fix.
Me personally it should be futher up the roof and not just on an extension pole (currently is not, screwed into the roofing iron on a small stand).
If they try that on me I'll be all over that. (In the current position there will NOT be any cable to extend it anywhere).
"Fit for purpose", and current location it is definately not fit for purpose even on an extension pole.
It needs to move up the roof.

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Reply # 1862934 12-Sep-2017 16:08

I reckon they decided that location based on where a sat dish should have gone. Instead hooked up the yagi.

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Reply # 1862938 12-Sep-2017 16:18

I think there is a mix of answers here, not one definitive one.
But I'll wait until resolution before picking the right ones. (The roof behind us is most definately an obstical, But I'm also thinking polarity to clear it up more at a minimium)

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Reply # 1862945 12-Sep-2017 16:31

Goosey: I reckon they decided that location based on where a sat dish should have gone. Instead hooked up the yagi.

Yes me too, Well and the location for it looked fine if you ignored the road being built behind us when putting it up (but no sections as such).
Behind us was always going to be deveoped even in our own house build it was obvious.

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