No TV1, 2, 1+1 or 2+1

I recently moved house to a fringe reception area (Heathcote Valley, Christchurch) and TV1, 2, 1+1 and 2+1 are no longer being received. I'm using the same FreeviewHD equipment with the stored stations as they were before I moved, but a new high gain aerial.

On the missing channels I get the channel name and current program information, but no picture or sound.

Signal strength varies from 26-42 (depending on having the splitter connected or not), but signal quality remains at 0. Previously I had TV3 at a signal strength of only 9, but still had signal quality of 7 and got a clear picture and audio.

I tried retuning 1 of my freeviewHD devices and the missing channels were completely removed.

How is it that these main channels are not being received but all the others are?

How can the signal be as strong as other channels, but have zero signal quality and therefore no reception?

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Permalink Reply by Bill McMurray on December 10, 2013 at 0:37

Hi AM,

During UHF digital transmission all the channels are grouped into three "muxes". The "TVNZ Mux" carries the four channels you are encountering reception problems with. So your problem is that the incoming signal for the "TVNZ mux" is too weak. - Unfortunately it can be quite common to be getting a good signal strength, but a weak signal quality - and the quality is the important one!

This can be caused by many things, - cable, connections, splitter, etc, but the most common is the positioning of the UHF aerial. So I suggest you get a reputable installer to first check the incoming signals of the three muxes where your aerial is currently located. If the TVNZ mux is considerably lower than the other two then the problem is in the aerial location and they need to do some signal tests to try to find a spot on your roof where the three muxes are all coming in with a good strong signal, then move your aerial to that spot.

If the signals from the three muxes are reasonably similar at the aerial, then the problem is somewhere between the aerial and your Freeview HD equipment; and then it's just a matter of testing the signals at the splitter, any connections, then the wall sockets, etc until they find where the signal quality is being lost. - Quite a common fault-finding process and any Installer worth his salt will be very capable of doing this.

Incidentally, when you do an autoscan on all UHF Freeview systems a prompt comes up warning you that an autscan will delete all existing channels. So if someone does an autoscan, when there is a weak signal coming in on one or more muxes, ALL the channels get deleted then ONLY the channels which are transmitting a strong signal at that moment, get reloaded back into the system.

I hope that helps you. Cheers, Bill.

Permalink Reply by AM on December 10, 2013 at 9:15