I get digital noise, mostly on channel seven, at different times. just checking the 'report' from the STB it says: quality- 100%, signal- 64%, S/N ratio- 32db. so how good are these figures? obviously quality is not a problem. what determines quality anyway? thanks,
Reported "quality" is a rubbery number related to decoded bit error rate. At 100% it infers effectively zero decode errors, which doesn't really fit with noise causing an issue.
Question time - are you seeing those numbers at the same time as the noise is present? If so, the STB reckons all is good at its output but the downstream teev is bitching. What does that tell you?
Which is normal with digital now can you think of a commonality when it happens we have channel 44 problems with certain overcast conditions and serious storms not that it matters unless gasoline is on
I should suggest once timing is established a house survey be done and any interfering wall warts or electrical devices be audited
No those are the figures when the picture is fine. I will try to get some when the pic is bad. btw I have several digital FTA devices including the Telstra T-Box, and believe it or not, it handles interference rather well. what local devices could possibly cause interference with the digital FTA transmission? the noise often comes between 4:30 and 7:30, but at other times too of course. I have a good antenna system set up, but my four way splitter amp is plastic (Kingray) and I wondered if the interference could be getting in that way, and if a metal one would be superior in that regard? any recommendations? also notice the interference comes more during wind, storm, and heat! but I removed the (fringe area) antenna dismantled and cleaned all the element connections and redid the cable connection. that boosted the signal level a bit. this was about 12 months ago now tho.
I can have good signal level and quality, and getting a good picture, but when there is interference present the interference gets to a certain level and suddenly the digital TV signal strength and signal quality just fall off a cliff and head towards zero. The picture and sound either just disappear or are completely unwatchable because of picture breakup, sound gone, etc
Digital TV works well while it is working, but there is no gradual degradation with increasing interference, it just suddenly stops working altogether.
I'm in a reception "black spot". High voltage powerline insulator breakdown is a problem with hot, dry North winds. Cars with "hot" unsuppressed ignitions are a nightmare for reception.
(On that note I've seen a "hot" ignition car put wide rolling bands of noise all over the SBS analogue signal. Talk about a high powered spark transmitter! _All_ the digital TV was just wiped out with this car, which for a time belonged to the lad next door.)
Just as an addendum, I've recently replaced a general VHF channel 2-12 aerial with a log-periodic Channel VHF 6-12 antenna.
My old VHF aerial had pretty poor signal strength up at Channel 11-12 (where digital 2 and 10 are located), and the new aerial has vastly improved performance on these two channels, which are much more reliable now
It is 39C today with a north wind but there is no power-line interference today, and reception on all digital channels is perfect.
I just ran "setup" and those Digital above vanished entirely but get 9 on Analogue? I will when I feel need arises just call a TV antennae/aerial guy they should know. Not keen on getting on roof myself
In that case, it might be the area. I often loose 9 & 10 grp. now 7, 9,
7 10 groups of channels.
Naah, if I'm at roof top, I have line of sight, but freznel affects might kick in.
Same area. The longest UHF TV aerial from Jaycar combined with something like this
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Current combination is about 6m from ground.
Thank you for the technical assistance, but frankly, give the general content on TV these days, I would find it hard to invest the time, effort and money in researching a suitable mast, then gaining council approval, then installing it.
Bit cloudy and snowy at time, but far more reliable than the digital channels.
I don't do that. Just put two backets onto peaked end of house(not barge board) and then put both aerials on top of a piep of thin pipe and lifted it up and clamped to the brackets. By "lift", I meant used and acro prop actually.
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