Wall plate issue?

Glaceon

I'm having an issue with the coax connections in my house which I think is down to the wall plates. Three rooms have these plates:

https://cpcireland.farnell.com/bg/865/satellite-coax-socket-2-gang/dp/PL08893

It's a two gang socket with two cable inputs on the back. But I've noticed that if I connect the two cables on the other end, they end up interfering with each other. For example, if I plug something into the standard socket it will also output via the F connector and vice versa. I tested with a multimeter and the cables themselves don't seem to be shorted, but the outside braid is shorted between the two sockets on the wall plate as shown below. Is that meant to be the case? Doesn't look right to me.

10-10-20

Hi, yes the shielding should be common, it's there for lightening protection and to reduce electrical interference. That shielding will follow-through to your set-top-box and that same shielding will connect to the outside of the HDMI port D-connector as well as other grounding points, so all normal there.

What interference do you see and on what devices? Can you disconnect any devices off other points and see if it lessens?

The Cush

https://www.boards.ie/discussion/2058305863/wall-plate-issue

Cheap, unscreened faceplates.

Go for the screened versions.

Glaceon

https://www.boards.ie/discussion/comment/120876663#Comment_120876663

So the issue I have is that if I feed a signal into it from one cable, I can pick it up on both outputs. The estate came wired with a dSCR satellite system but it also carries some DTT channels on the same feed. But they’re unreliable so I wanted to put in Saorview instead. The provided DTT channels are between 40 and 48 so they interfere with the Saorview feed from Clermont Carn. Feeding both cables into the same wall plate causes the two feeds to interfere with each other and I get major breakup of the DTT channels and a lot of bit errors. It almost seems to act as a single feed splitter.

10-10-20

https://www.boards.ie/discussion/comment/120876764#Comment_120876764

Crosstalk.

https://www.boards.ie/discussion/comment/120876735#Comment_120876735

Think you got it there. But also check that you're using good quality coax cable with matched impedance.

Glaceon

I suddenly get more productive when Love Island comes on... 😂

I did some tests upstairs and was able to conclude that it is the wall plate, I didn't have any problems if I connected them separately. Now to find some good, shielded ones. Cheers.

Glaceon

I'm having trouble finding a suitable replacement. Any of the screened plates I can find seem to be diplexed ones (one input to two outputs), whereas I need a non-diplexed one; two in and two out. Any ideas?

The Cush

https://www.boards.ie/discussion/comment/120888707#Comment_120888707

I was surprised too, regarding availability.

First suggestion, Twin F Type (Slim Line) from PROception - Blake UK (blake-uk.com), use one for sat and the other for aerial, with F-Type to Coaxial Plug Fly Lead (1.5m) between wallplate and TV

Second suggestion, the option I used a few years ago, modular wallplate with F and coax modules (male & female coax types) from various manufacturers - 75 Series Modular Wall Plates - Antiference, - Wall outlets - Coax distribution - Products (triax.com) for example. Widely available from various outlets, example - Aerial & Satellite Sockets & Wall Plates | CPC (farnell.com)

I have also used this angled socket from Vision Products, SAT 1/TERR / SAT 2 LOW PROFILE Wall Socket - Vision Products (Europe) Ltd (vision-products.co.uk). Sat 1/Terrestrial cable input is diplexed, Sat 2 cable input is separate.

Glaceon

https://www.boards.ie/discussion/comment/120888999#Comment_120888999

You absolute legend! I noticed that the part number in the first link was the same as one on freetv.ie so I ordered three of them yesterday afternoon. Arrived around lunchtime so I tested one and it works perfectly. No crosstalk between the two cables.

lucernarian

Bit late now, but I once made my own faceplate once using f connectors and female-to-female joiners or f-connector to regular TV (belling-lee) converters and it has worked well. Not sure there's a lightning protection advantage when pretty much everything plugged into aerials/dishes is double-insulated without a dedicated earth.

winston_1

Such is the power of lightning it won't care. It will just crash through the double insulation and into the mains supply where it could destroy other electrical appliances. The same would apply to the original faceplate. Those isolation capacitors are to isolate mains leakage not lightning protection.

For lightning protection the aerial needs a heavy copper conductor straight to earth.