In reply to a post by eckiedoo:

Is it any/every day of the week; or is it clearly not happening on, say, Saturday and/or Sunday?

I wish it was consistent then it would be much easier to be ready for it with an AM receiver but some day's nothing, other days different time but on average just before and just after lunch if at all, but then sunday afternoon so a bit inconsistent, definitely not industrial hours but then this is a farming area and during harvest (now) farms operate 24/7

In reply to a post by MHC:

And who pays for the extra poles to be installed?
And why would EMI from a mains cable at 50 Hz, and even allowing for 101st harmonics cause problems with VDSL? They are in totally different frequency ranges.

There are no extra poles involved, in my case it's directly from the existing OR pole to my house. There is huge amounts of EMI on power cables at all sorts of frequencies originating from electronic equipment and arcs from brushgear etc. As for pickup it depends upon the kind of telco cable and the twisting rate, the more twists the less EMI at higher frequencies, the new drop wires I have seen are twisted almost as miuch as CAT5 where's my drop cable has no twists at all.

Thanks for the quick answer.

What about the QLTs, do you try that test during those bad spells etc?


Apart from farms, are there any "industrial" units near your lengthy line?

Regarding farms - any milk collection runs, with possibly a tanker engine or other related device running for a relatively short period?

Sludge collection?

Edited by deleted (Mon 22-Aug-16 09:34:05)

Good morning
I have done QLT's both during and outside of events and not noticed any difference, just a steady background hum with no crackles etc however radio goes crazy with loud buzzing.

No industrial units as such but some intensive pig units, no dairy herds here, sludge tankers all tractor driven, I know I have been scratching my head too, this thing has to be 10's of Kw or more!!

I keep thinking of large PWM drive of some sort because the frequency shifts during the event, starting around 750Khz then moving towards 550Khz weakening as it goes.

I found a BT/OR form for there ISP customers to fill in here
so I added it to my Pnet fault ticket asking if the needed help to fill it in!!

I already posted this once but it seems to ave lost it!

In reply to a post by fourtytwo:

Good morning
I have done QLT's both during and outside of events and not noticed any difference, just a steady background hum with no crackles etc however radio goes crazy with loud buzzing.

The steady background hum is coming from the mains cable , the radio goes crazy as it is picking up the EMI from the cable and emanating as loud buzzing.
Is there a main grid anywhere near your home that might have bad transformer hum.?
You could test this theory by moving the radio nearer to the mains cable or meter inside your home.
If the buzzing gets worse then your mains supply is being supplied by a grid that could need some more transformer shielding, just a thought.

Edited by deleted (Mon 22-Aug-16 11:23:57)

Could the pig units have some form of automated feeding; or sludge clearance at the other end of the natural cycle?


The frequencies you have given are in themselves clearly above audio frequencies, which in conjunction withe the QLTs being apparently fine, suggest that it might (only might) be interfering via the power supply/main adaptor for the modem/router, rather than the phone line/broadband connection route.

I suggest you try an EMI/RF Filter in your mains connection - often incorporated in to multi-way mains extensions; and relatively cheap.

Edited by deleted (Mon 22-Aug-16 11:40:00)

Is there a main grid anywhere near your home that might have bad transformer hum.?
You could test this theory by moving the radio nearer to the mains cable or meter inside your home.

Yes I have 440V/3Ph and neutral on poles along the street at the front and 11Kv/3ph about 50 meters down the back garden, my end of the village is fed from a pole transformer about 150M up the road where there is also a large contracting farm and pig unit.
Next time I get an event hopefully I will see it on the snr plot and rush around with my battery portable

In reply to a post by eckiedoo:

Could the pig units have some form of automated feeding; or sludge clearance at the other end of the natural cycle?
The frequencies you have given are in themselves clearly above audio frequencies, which in conjunction withe the QLTs being apparently fine, suggest that it might (only might) be interfering via the power supply/main adaptor for the modem/router, rather than the phone line/broadband connection route.
I suggest you try an EMI/RF Filter in your mains connection - often incorporated in to multi-way mains extensions; and relatively cheap.

The trouble is pig units are bio sealed and the farmer naturally doesn't take kindly to visitors however I will endevour to have a chat at some stage but to him EMI is a bit meaningless.
Long ago I fitted ferrites to the router power supply lead with no apparent effect.

So don't you just need this bell-cable dropwire replaced and all will be well?

Edited by deleted (Mon 22-Aug-16 12:14:29)

In reply to a post by BatBoy:

So don't you just need this bell-cable dropwire replaced and all will be well?

I feel very very strongly this would cure the problem or at least reduce it to insignificance but I cannot get anybody in Plusnet to listen to me despite various fault tickets complete with evidence over many months
Does anybody know of how to push a problem up the tree in Plusnet, I don't particularly want to leave ?