Freeview DTT - what is the lowest acceptable quality level in scanchannel

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imadog

107 posts

Master Geek

#30755 20-Feb-2009 09:44

Hi Guys,

I have recently moved house in Lower Hutt and just set up my aerial in the roof to receive freeview.

I am pointing at the Fitzherbert (infill) transmitter and get the following quality levels according to the program scanchannelBDA.exe

714000 - 50%
730000 - 65%
762000 - 100%

Does anyone know what the min quality level should be to avoid frame freezes? Its probably unlikely I can get 100% on all 3 channels but Im sure I can increase the 50% mark but is it worth another trip to the roof or is what I have fine?

Cheers

cyril7

9058 posts

Uber Geek

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#196893 20-Feb-2009 12:12

Hi, the % reading from STB quality meters is non calibrated so only a relative guide, how it may really relate is dependant on how its coded, but one could possibly assume 50% is 3dB less C/N than 100%.

It could be your antenna has a lowend drop off, or most likely I find adjusting the aim of the antenna can dramatcially effect the slope across the muxs, this is where a proper Feildstrength meter is invaluable. Is you antenna pointing directly at Haywards, site, this would be a good start.

Does the box also produce BER rates, is the post viterbi decode BER pretty much 0 or E-6 or better on the poor muxs if so then probably not too much to worry about.

At the end of the day if its not pixeling then its most likely fine.

Cheers
Cyril

mcraenz

1140 posts

Uber Geek

#197377 22-Feb-2009 23:00

Not sure about the STBs out there but if you're using an HTPC you can get some strange results that might not be obviously a signal problem but ultimately is.

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imadog

107 posts

Master Geek

#197379 22-Feb-2009 23:03

thanks for the help.

No stutter over the weekend so Im going to leave it as is.