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Humax Signal Strength/Quality


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Old 11-04-2011, 20:49
stanandjan
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The Humax provides easy indications of strength and quality for each channel..
Freeview HD sets also allow such measurements.
I have Googled ..but obviously inaptly ..to find how the Quality assessment is determined..
I imagine that the Transmitted sends out a 100% quality signal.
It is interesting that the Quality is often the determinate factor not the Signal Strength.
Hence i was seeking information as to the factors affecting the quality as well as it's measurement..
In passing..
I have tweaked many 470k and 10.7M coils in my time ..hence i am surprised in this digital age at the fragility of the Audio signal ..as in my tests to date.. it always fails before the everso complex digital signal.
Am i alone in my unawareness?

Stan
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Old 11-04-2011, 21:10
grahamlthompson
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It's a measure of how hard the tuners error correction is having to work to recover the original data using the built in redundancy in a digital signal. The more error correction the worse the quality. As the quality falls there's a narrow band where the picture starts to pixellate as the error correction fails to recover every bit in the original data. A small reduction then results in total failure and the picture is lost (The digital Cliff). Signal strength is a poor guide since it's simple to amplify the carrier signal, too much amplification comprimises the tuners abilty to resolve 0's and 1's
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Old 12-04-2011, 00:52
stanandjan
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'very Interesting' as that Hun in Downtown Burbank used to say..
The Panny supposedly measures Error Rate and during the reductions in signal strength i then did.. indicated 0+0E000 thru' out.
I go to bed more aware than when i awoke.. Mnay thanks

Stan
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Old 12-04-2011, 09:28
jcsager
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'very Interesting' as that Hun in Downtown Burbank used to say..
The Panny supposedly measures Error Rate and during the reductions in signal strength i then did.. indicated 0+0E000 thru' out.
I go to bed more aware than when i awoke.. Mnay thanks

Stan
The indications from my Panasonic TV are quite good. I've never seen anything other than 0.00E+00 for the bit error rate on satellite, but it certainly increases for some of the Freeview muxes. My signal indication is a solid 10 except for transponders above 12.5GHz where it drops one notch. The quality indication is 10 for transponders with 22000kS/s symbol rate and drops to 7 for 27500kS/s transponders. Perhaps it measures the noise margin, which of course will be lower for higher symbol rate signals.
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Old 12-04-2011, 20:27
stanandjan
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Thanks Jc..My new Panny only has Freeview HD and i feed in the Humax into HDMI 1..
Feeling nervy at the moment as more people report Screen Bleed..

Stan
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