Signal Quality difference betwwn channels

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cosd

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#27811 7-Nov-2008 11:12

I'm having problems with TVNZ bit not TV3, c4, Maori etc. I downloaded a signal qality program and it said that the TVNZ signals were at 60% while the others werwe at 100%. I presume this is why I'm having problems. What does this mean - I had assumed that all frequencies were transmitted from the same aerial so why would I see this difference

cyril7

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#176584 7-Nov-2008 12:06

Most likely reason is interference, you maybe picking up a adjacent channel signal. What Tx are you pointing at and whats your approx location.

Cyril

cosd

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#176600 7-Nov-2008 12:55

Hi Cyril.
I live in Seatoun / Wellington. I've simply plugged my PC into my aerial socket which I no longer use gor Tv as I have Saturn. I'm using Wellington Infill as I couldn't get anything off Kaukau.

cyril7

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#176706 7-Nov-2008 19:03

Hi, from seaton if you cannot see KauKau you need clear site of fitzherbert which is on the hutt hills above NaeNae.

Cyril

cosd

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#176797 8-Nov-2008 10:22

Thanks Cyril.
I think we're pointed there but I still not sure I quite understand. Why do I get perfect TV3 - Are the TVNZ Freeview channels broadacst differently?

cyril7

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#176810 8-Nov-2008 11:45

No all are identical except for frequency, they use the same transmitters model and all sit in the same racking and feed into a common combiner and common antenna. However the channels are spread of 50MHz or so, therefore propagation anomolyies can cause a large difference especially if you are not clear line of sight and clear of freznel zones.

Dont forget Fitzherbert is Vertical, KauKau horizontal, check you are set for Vertical if thats where you are aiming.

Cyril

cosd

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#176949 9-Nov-2008 17:56

Thanks for your help - sounds like I need to do some work with my aerial