- This topic has 23 replies, 5 voices, and was last updated 12 years, 11 months ago by
.
-
Posts
-
Hi, alas the p[roblem has returned, with the x4 HD channels pixalting, and the picture/sound breaking up. I have followed the given instructions to the letter to re-tune but no difference.
The 6 numbers from my local transmitter ( Emley Moor ) are ch.41,44,47,48,51 and 52.
I have set it to auto retune and immediately cancelled, the manual tuned to each of the 6 aforementioned chanel numbers. All of the with the exception of Ch.41 have tuned in a certain number of channels on the DVB-T setting, but when I try manual tuning for ch.41 I get no channel found, UNLESS I switch the setting to DVB-T2, which I assume is the HD channel as once I switch to this setting it loads/tunes up the hd channels. But, once all that is done, the x4 HD channels are still breaking up and pixelating. I cant understand why this is happening as on Saturday morning ALL HD channels were fine, then last night they all went scrambled again without us touching anything except change channels on the tv in the usual way with the remote.
So I’m stumped as to what to try next. Remembering that the exterior aerial is fine, and we had perfect pictures until a few days ago when this problem started.
Oh dear.
How close are you to Emley Moor ?
Do you have a uhf splitter available. If so can you try fitting it to the aerial input to the box to see if reducing the signal level makes any difference.
Do you have any amplifiers in your system especially a masthead one fitted to get digital before DSO ? If so try removing it.
As before check with close neighbours to eliminate a local interference source.
Do you or your neighbours have Christmas lights?
Hi, thanks for your messages, Graham, we are about 12 miles from the transmitter at Emley Moor, and regarding splitters etc we dont have one of those, just a standard aerial cable running from the new roof aerial, down the building, through the window and plugged into the back of the Humax box.
The neighbour 2 doors down from us does have a lot of christmas decorations fitted to the outside of her house, which are lit and flashing during the evening..but they are off during the daytime and this HD problem is constant.
When the new aerial was installed was a new coax downlead fitted ?
Does the cable go through a wallbox ?
Is the Belling Lee aerial connector properly fitted. Check very carefully for a tiny whisker of screen touching the centre core. Unless the connector has a tiny screw to clamp the core it should be soldered. I usually use F connectors with the appropriate adaptors. These don’t need soldering.
Although unlikely too high a signal may be the problem as the box has a pretty sensitive tuner, a cheap plug in attenuator will solve this. (a splitter will reduce the signal level by a bit more than 50%)
Other than the local source of interference running out of ideas.
Hi Graham, thanks for your help in this matter, its much appreciated although to be honest its a little complicated for my basic knowledge. What I have just done is to contact the company who installed the new aerial, about 10 mins ago and I awaiting a call back from them. If I can get them over here ( probably not till after the holidays) then they can sort it out.
From what I can see, the cable is a potential problem as we have just had a new roof put onto the bungalow and I did notice that there was a few cracks on the cable casing, but, the HD DID work before they left so I didnt question it at the time. Perhaps this could be the problem…
andywhitham – 3 minutes ago »
Hi Graham, thanks for your help in this matter, its much appreciated although to be honest its a little complicated for my basic knowledge. What I have just done is to contact the company who installed the new aerial, about 10 mins ago and I awaiting a call back from them. If I can get them over here ( probably not till after the holidays) then they can sort it out.
From what I can see, the cable is a potential problem as we have just had a new roof put onto the bungalow and I did notice that there was a few cracks on the cable casing, but, the HD DID work before they left so I didnt question it at the time. Perhaps this could be the problem…
Cracks in the cable coax cover is a definite problem. Water in the coax affects some frequencies more than others. Make sure it’s not tracking internally down the coax, if it gets into your set top box it can do some expensive damage.
The coax should have been replaced along with the aerial preferably with double screened WF100 grade coax.
In all probability your old aerial would have been fine if the coax had just been replaced. Were the contractors CAI approved ?
The contractors were hired by the company who own the bungalow we rent, I think they are undergoing a big re-roofing contract at the moment, so we got a new roof, along with new aerial etc. Still awaiting a phone call from them, hopefully get them back here asap.
** Just been outside checking the aerial cable running down the side of the bungalow. Its not best quality, looks very old and when I came back into the house and switched to HD, it seems to be working again, so it looks like the exterior cable could be the fault. Will definately get them to change the whole length of cable from aerial to Humax box when they come.
Unscrew the coax plug that is connected to your box and check carefully for damp (a piece of bog roll makes a good damp tester – assuming you don’t use the old Izal type
). Coax cable makes a good microbore water pipe. I would wind some insulation tape tightly around any cracks in the outer cable as a temporary water protection.
Self amalgamating tape is even better.
- You must be logged in to reply to this topic.