[padarom]

Hi All,

Does anyone know of a ground loop isolator that can be attached to a freeview coax cable. I'm running freeview into a multiroom av distributor and the picture quality is poor. Quality is fine when the signal is run straight to a TV so I suspect this to be a ground loop issue.

[Daniel SL]

what is the "multiroom av distributor"?

[roscopip]

Keene stuff is pretty good. Is it running through a coaxial distribution unit or as composite direct to each screen or over twisted pair?

Keene Electronics

[padarom]

The AV distribution system is a Niles ZR6 audio and VS6 video system. Actually the arial feed is coming through a BT Vision box then to the AV multiroom distribution system.

[dj-dulux]

I would have thought that a ground loop is unlikely, I've never come accross it in a domestic setting. Have you checked the levels, is it possible that the signal is too great and overloading the Niles?

Dupe...

[charris cy]

Originally Posted by padarom

The AV distribution system is a Niles ZR6 audio and VS6 video system. Actually the arial feed is coming through a BT Vision box then to the AV multiroom distribution system.

So is this a composite or component signal? I just had a quick look at the specs of the BT Vision Box and it seems it does not output composite or component. It seems it outputs only s-video and scart. How are you using this with a component video matrix switcher?


This is how I would troubleshoot IF you use a composite or component signal signal into the Niles switcher:

1) Take the signal out of the BT box and connect it direct to a tv. If the quality is ok then the problem is the Niles matrix switcher or the cables from the switcher to the tvs.

2) Do you have other video sources in the switcher? How is their quality?

3) What cables are you using for video? Normal RF cable is not suitable. You should use either bulk RG59 or RG6 "serial digital" cable and terminate it or use premade component or composite cables.

4) If you are only using composite then if you the use the green RCA in and out on the matrix switcher might still work to send composite to the tvs.

But how I would do it if the BT box only outputs scart is I would convert it to component using a suitable interface and then go into the matrix switcher.

I have no experience with the BT box so a pro from the UK has to confirm what if what I am saying above is correct.

[padarom]

Thanks all for your responses.

It turns out it wasn't the aerial causing the interference. I had connected a QED Scart RGB to Component Video Adaptor (QED QCV Scart to Component Video Converter - FutureShop.co.uk) in order to convert the signal coming from the BT Vision into component for distribution around the house.

Somehow, the QED kit was causing the video signal to be distorted because when I replaced it with a JST RGB to component converter (CyberSelect | JST RGB to Component Converter), the signal became crystal clear....HOWEVER, now only three of the four connected televisions display a signal from the BT Vision box. The fourth TV (a Ferguson F1603LVD) no longer displays a picture (playing a DVD displays ok).

Does anyone have any idea on what is happening and how to rectify it?

[Joe Fernand]

Is the DVD playback 50Hz or 60Hz - it may be the Ferguson F1603LVD TV only supports 60Hz YUV signals.

Joe

[padarom]

The DVD player is a Samsung BDP-1500 (Blu-ray player).

[padarom]

Success at last!! After trying a third brand of RGB to component converters, my installation now works flawlessly and I have good quality pictures on four televisions. Thanks to roscopip for pointing me in the direction of Keene. No doubt I shall be avoiding the other brands in future as it has taken over a week to resolve this issue. Now to return the other converters and get my money back.