Bit of A/V advice if you please
28 April 2008, 10:53 PM
#1
Scooby Regular
Thread Starter
Join Date: May 2002
Location: Dunfermline,Fife Xbox/PS3 Gamertag: RB5black
Posts: 4,746
Likes: 0
Received 0 Likes
on
0 Posts
Bit of A/V advice if you please
Just moved house and put my new Toshiba 40" picture frame TV on the wall.
Sparked up the sky+ after install and the picture was a bit off so I bought a good quality scart cable and the picture is much better. After retuning to work offshore the Wife now say's she's getting some picture distortion from the sound
I think I know the problem is the amount of cables running close to each other and inside the wall cavity running to the TV. I have a very bad mix of A/V cables and power cables for DVD/Xbox/Sky+/PC/360 all in very close contact.
So do I need to use a pass through Av amp to get round this ?
Sparked up the sky+ after install and the picture was a bit off so I bought a good quality scart cable and the picture is much better. After retuning to work offshore the Wife now say's she's getting some picture distortion from the sound
I think I know the problem is the amount of cables running close to each other and inside the wall cavity running to the TV. I have a very bad mix of A/V cables and power cables for DVD/Xbox/Sky+/PC/360 all in very close contact.
So do I need to use a pass through Av amp to get round this ?
29 April 2008, 09:39 AM
#2
Scooby Regular
Join Date: Jul 2003
Location: Surviving as a soldier of fortune on the Los Angeles underground...
Posts: 7,181
Likes: 0
Received 0 Likes
on
0 Posts
The main distorting signal usually comes from the power supplies - if all the cables are in the wall it might be that its just the tv's power cable causing the aggro (Given my own personal experience of Toshiba I'd be blaming that anyway!)
How many of those sources do you have running at the same time? I doubt you'd have them all going at once so if only one is switched on, the only other cable doing anything is the tv power lead.
Normally all the power leads on the rear of the sources come out from the left (as you look at the front), this is usually so you can bunch them all together if you have them stacked and keep them away from the video / audio cables.
It might just be your cable management needs tidied up - no need spending money if an new amp isnt going to fix it.
unplug everything except power leads, gather them together with cables ties or something then re attach all the other leads keeping them as far as practicable from the power leads.
How many of those sources do you have running at the same time? I doubt you'd have them all going at once so if only one is switched on, the only other cable doing anything is the tv power lead.
Normally all the power leads on the rear of the sources come out from the left (as you look at the front), this is usually so you can bunch them all together if you have them stacked and keep them away from the video / audio cables.
It might just be your cable management needs tidied up - no need spending money if an new amp isnt going to fix it.
unplug everything except power leads, gather them together with cables ties or something then re attach all the other leads keeping them as far as practicable from the power leads.
29 April 2008, 09:50 AM
#4
Scooby Regular
Join Date: Jul 2003
Location: Surviving as a soldier of fortune on the Los Angeles underground...
Posts: 7,181
Likes: 0
Received 0 Likes
on
0 Posts
29 April 2008, 10:10 AM
#5
Scooby Regular
Join Date: Sep 2006
Location: Worthing..
Posts: 7,575
Likes: 0
Received 0 Likes
on
0 Posts
You can shield with it, same principle as a faraday cage- Although you may introduce coupling between the carried signal in the cable to the shield which in itself will cause problems. You could manage it by connecting the shield tape to the ground of the connector, and then decoupling it.
A far more manageable way it to have the signal cables seperated from the AC as suggested, and if they do need to cross, cross them at 90 degrees.
A far more manageable way it to have the signal cables seperated from the AC as suggested, and if they do need to cross, cross them at 90 degrees.
29 April 2008, 10:15 AM
#6
Scooby Regular
Join Date: Aug 2007
Posts: 359
Likes: 0
Received 0 Likes
on
0 Posts
i was just cutting some video cable for one of my CCTV cameras and it has some kind of foil insulation inside it, i thought people wore foil hats to stop the aliens controlling there minds ?
might be worth a google actually
29 April 2008, 10:17 AM
#7
Scooby Regular
Join Date: Aug 2007
Posts: 359
Likes: 0
Received 0 Likes
on
0 Posts
found this
Video Cable Shielding — Audioholics Home Theater Reviews and News
A shield on a coaxial cable acts by intercepting electromagnetic energy which it encounters, and shunting that energy to ground, preventing it from reaching the center conductor of the coax where the signal travels. To do this effectively, a shield needs three things: (1) high coverage, so that energy cannot readily pass through holes in the shield, (2) good conductivity, so that energy, once it enters the shield, will find its easiest path to ground; and (3) good connection to ground at the ends of the cable.
The two most common types of shield are foil and braid; cable can be wrapped in a conductive foil, most often aluminum, or it can be wrapped in a braided mesh of tiny wires. Foil and braid have very different characteristics, which, as we will see, accounts for the fact that many cables have both types of shield.
The two most common types of shield are foil and braid; cable can be wrapped in a conductive foil, most often aluminum, or it can be wrapped in a braided mesh of tiny wires. Foil and braid have very different characteristics, which, as we will see, accounts for the fact that many cables have both types of shield.
Trending Topics
29 April 2008, 11:02 AM
#8
Scooby Regular
Join Date: Jul 2003
Location: Surviving as a soldier of fortune on the Los Angeles underground...
Posts: 7,181
Likes: 0
Received 0 Likes
on
0 Posts
yeah, I know coaxial usually has some braiding around it which is what made me think - but as you've stated it needs grounded at either end of the cable - alu foil round the outside wouldn't be able to do that would it?
Think sorting out the wiring is the main thing I'd look at, by the sounds of it the tv's power lead is running parallel to the other cables and causing interference - as Pete has said you need to minimise this as much as possible and if wires must cross then to keep them to 90 degs to one another...
Think sorting out the wiring is the main thing I'd look at, by the sounds of it the tv's power lead is running parallel to the other cables and causing interference - as Pete has said you need to minimise this as much as possible and if wires must cross then to keep them to 90 degs to one another...
29 April 2008, 06:36 PM
#9
Scooby Regular
Thread Starter
Join Date: May 2002
Location: Dunfermline,Fife Xbox/PS3 Gamertag: RB5black
Posts: 4,746
Likes: 0
Received 0 Likes
on
0 Posts
Think sorting out the wiring is the main thing I'd look at, by the sounds of it the tv's power lead is running parallel to the other cables and causing interference - as Pete has said you need to minimise this as much as possible and if wires must cross then to keep them to 90 degs to one another....
I think it's as you say messiah, power cable is causing the grief. I've got a week to go offshore then I'll do my best to seperate the power from the other cables. Getting the Wife to tell me how bad the a distortion I have is like getting blood from a stone.
The cable run under my A/V unit is the main problem rather than the wall internal. I have all the cables stuffed into a very small space and they all run over the prower brick for the xbox and the 360 and I know that can't be good.
Craig.
Thread
Thread Starter
Forum
Replies
Last Post
Sam Witwicky
Engine Management and ECU Remapping
17
13 November 2015 10:49 AM
hedgecutter
General Technical
3
25 September 2015 02:35 PM