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Digital signal anomaly


johndrew
Resolved

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A short while ago I posted with a question with regard to a TV digital box installation link text; all has gone well but I have an anomaly which hopefully someone can clear up for me.

The digital TV suffers from a poor signal on the ITV channels (ITV 1, 4, 5 and the associated +1 offerings) only; all other channels are good; this is from the signal strength indicator which is incorporated into the TV setup menu. As a result I get 'pixelation' (picture break up) on occasion. However, when viewed through the digital box and using the RF loop aerial these channels are perfect with no break up of picture when those through the TV digital receiver are doing so.

The aerial source for both TV and digital box is the same so logically it must be the sensitivity of the equipment fed. Is this a known 'feature' of some equipment, a result of transmission power or a combination of things? Can anyone shed any light on this?

Many thanks in anticipation.

1: http://Another digital changeover question

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morddwyd

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Might be johndrew's problem, but I don't think there's an analogue transmitter left within 100 miles of here.

What we've got is all we're getting!

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dms_05

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morddwyd - not necessarily. Some digital Mux's will only be increased to full power on the very final final DSO day. Like you we have no adjacent analogue TX's but still the Mux on Ch 49 is at 25% of it's final power. Odd but true! Even in analogue areas most people now have digital sets of one type or another and the need to worry about the final 5% of analogue viewers is effecting the 95% who are DSO'd. However this was the system set up many years ago when no one expected people to switch so quickly and easily to digital. So it' s still worth waiting for the final set of changes.

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johndrew

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dms_05

I had not considered the particular scenario you outlined above, but that could be exactly why only one set of channels (ITV) is affected. I guess I shall have to sit back and see what happens when the analogue transmitters are turned off; hopefully the signal will be boosted and the TV will register the increase in signal strength.

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morddwyd

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dms_05

Not really a question of adjacent analogue transmitters.

I don't think there are any left in the whole country.

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