Can't get channels we used to be able to.

We live rurally near Otorohanga. Have occasionally had problems with reception of certain channels notably Prime. Usually this has been after strong winds and realigning the aerial fixes this. Usually when this happens the signal is very pixellated.

Now there is absolutely no signal for Prime, Maori, Choice, Central, Al Jazeera, Parliament, National Radio, Concert Programme and others. We can get TV1, 2, 3, 4, the plus 1 channels, Edge and Shopping.

We have checked the aerial alignment, retuned the TV and done a factory reset. None has produced the goods.

Any clues? Nothing has changed our end.

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Permalink Reply by forumuser on February 9, 2015 at 23:58

Hey Alison

If you are getting only one group of channels then it's likley to do with your aerial or the signal path to the transmitter ( even though you have checked properly) is there a clear line of sight to the transmitter? How is your set up from the aerial to the TV? are there any Set to boxes connected, other rooms which may use the same aerial for Freeview?

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Permalink Reply by Biggles on February 10, 2015 at 9:21

Joshua's right. You are missing 2 of the 4 Mux so must be an antenna/cabling problem.

What signal strength is indicating on the 2 Mux you are receiving (CH32 & 34 assuming you point at Te Aroha) compared to the other 2 (Ch 28 & 36)?

Description of you setup and picture of your antenna may help diagnose the problem.

Do you have a masthead Amp?

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Permalink Reply by Alison Sellars on February 10, 2015 at 9:33

There is clear line of sight to Te Aroha but it is a long way away. We don't have a set top box... the TV has the freeview business as an integral part. The aerial is connected to wires in the house and the TV plugged into the aerial socket. There is only one TV. We will check the connections in the roof. Anything else about the aerial we should look at?

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Permalink Reply by Alison Sellars on February 10, 2015 at 9:36

That all sounds helpful. We'll find out about the signal strengths. We don't have a masthead amp.

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Permalink Reply by Biggles on February 10, 2015 at 13:01

Basically make sure it's in excellent condition and the cabling is good quality rg6 co-ax running from the antenna direct to the TV. You say it's connected to wires in the house but they may be old poor quality cable.

Confirm it is a UHF antenna like one of these

http://freeviewforum.co.nz/page/antenna-guide

and is horizontally polarised like those in the link.