Fiber causing interference on MW even when turned off

[fiberfan]

So I am getting a pulsating low signal buzzing noise from around 1010 to 1550 khz which I never had before my installation. If I put a radio right near the round disc even with both the router and BT box switched off it's realty bad bit like going near a cheap power supply 

Is the cable going to my house from the telegraph the other side of the road to me causing this ? What's odd if I go outside and put the radio near the square grey box I don't pick up anything at all

[fiberfan]

I am a MW DX'er and radio ham / SW listener btw so any form of new interference on any radio frequency is annoying / perplexing. It could be something else locally from a neighbour but doesn't seem likely atm 

[CrimsonLiar]

Sounds like the twin wires in the cable are the culprit, which if it needs fixing would be an Openreach issue.  I'm saying "if" because is it actually causing any issues remembering that radios on AM (MW) will use automatic gain to boost weak signals!  It's still also possible that the issue is with the receiving device.

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[CrimsonLiar]

Okay can no longer edit my last post

Following comments from the OP in their last post (so far) it now sounds less likely to be the receiver.  With it being a buzz rather than a crackle and covering such a large spectrum then it does indeed sound like an OpenReach problem (good luck explaining this to VF customer services).  While I'd keep an eye on this thread I'm also thinking that the HAM radio community could be more helpful - I doubt you'll be the first to have had this issue!

[Ripshod]

@fiberfan I've just had alook at the "disc" in my install. It's just a dumb plastic cover that prevents the fibre getting damaged and has zero electrical/electronic inside. I can categorically state that this "disc" is not the source of any interference.

Being a fellow radio operator I'm surprised you don't understand that it's impossible for an optical fibre or a plain plastic cover will never produce radio interference detectable on an AM radio.

Look elsewhere.

[CrimsonLiar]

It may not be a plain optical fibre though!  Some FTTP installs use a cable that includes a copper pair in addition to the optical fibre - don't know enough to say where this would terminate.  Though its ability to work as a transmitting antenna under the wrong conditions is beyond my experience.

[Ripshod]

You're right in that any wire combined within the fibre cable could pick up interference then that interfence has to be there already. In our installs any wires are unused and isolated inside our home and outside at the box.

In this case the OP is likely picking up mains noise (hum) from an RFC or anything metal within the wall. But surely they would have recognised the mains hum just from the frequency.

There seems to be a lot of conspiracy still going around on the Web. To have not been able to get an answer from a forum loaded with experience radio operators is just........... unbelievable. 

[Cynric]

I looked for answers using a well known search engine and couldn't believe my eyes, so I kept quiet. When younger I was a keen SW DXer. I had 200 feet of copper wire running up and down the garden to get the long range stations.

[Ripshod]

I started with CB in the 80s, operated illegally on SSB for a good decade before I went legal. Got my G0 ten years ago. 

[Jayach]

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@CrimsonLiar wrote:

It may not be a plain optical fibre though!  Some FTTP installs use a cable that includes a copper pair in addition to the optical fibre -

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That is true, but unless they took a different route into the property. the copper pair would already exist, and the customer should be aware if they have a hybrid installation.

[fiberfan]

> That is true, but unless they took a different route into the property. the copper pair would already exist, and the customer should be aware if they have a hybrid installation.

Don't know how to quote on here but the copper connection is still physically there just that they have disconcerted it of course. I will be fully fiber fttp when I get my landline working again with the needed RJ11 adapter I an still waiting for