Just a tip wih locating possible REIN wih a radio.
You will hear all sorts of noises from different electrical appliances when you hold a radio close by.
Also move the radio side to side 90 degrees and verticaly by 90 degrees. The reason : imagine a cable running in a straight line. Then imagine the electrical noise emminating from that cable like rings similar to the ripples on the surface of water when you dip your finger into it. This is very much like the way field lines work fom a cable with electricity.
In a MW radio the antenna is about the size and shape of a small marker pen. Its most sensitive to an electrical signal if the field line you imagined is running lengthways through the middle of that pen shape.
By not moving the radio around as you look for REIN you may be walking right past a source and not hearing it as the antenna is in the wrong orientation to pick it up. I remember a situation where everyone else wa suspecting one set of power cables yet this trick informed me the source was some HT power cables further away. (Anyone familiar with using a C.A.T. Cable avoidance tool. for locating utilites outside would be familiar with this concept when you think that the same type of antenna is that bulge at the base of the C.A.T.)
One way to experiment with this effect. If you have Dropwires in your neighbourhood feeding homes with telephony walk around with a MW radio at 612khz. You'll hear distinct shhhhh noise from amny of them. Thats Broadband you can hear. Isolate a cable and try rotating the radio by 90 degrees this way and that and notice how it get more sensitive in a certain orientaion. Now move from directly under the cable to a few feet away and note how you need to change the angle of the radio to get the greater sensitivity. Think of those radiating circles of electrical noise again.
Nothing wrong with listening to the enviroment when the dsl is ok as you have something to compaire with when there is the problem. A new noise or something louder perhaps. You may hear a distinct noise but dnt let that fool you into a wild goose chase as just because a distinct noise in around the area ther's still a good chance that that's not the problem.
Don't be fooled into thinking the source has to be overhead cabling. I started thinking that way but later found the deception in my mind as to, just 'cos you can see it can sway you from considering an underground source which turned out to be as likely as overhead.
When I used the word 'source' above I perhaps should have used the term emmiter. The worst problem with REIN is the actual source generating the errant signal may be tucked away some where but the signal is emminating from any cable its ultimately connected to. ie I'm hearing a loud signal which I know to be the problem. I can hear it comming from the underground electrical cabling to equal volume along several streets on a housing estate. Later the source was found to be a LCD monitor in an upstairs study in a house toward the edge of the area with the noise.
That exsample wa a good one of braking things down to locate it. I could tell it was coming through the 240v network, so it's feeding through the mains. At the errant house the owner was amiable to turning off his electrics at the consumer board (noise dissapears) turn it back on (noise is back) then switch each fuse one by one in turn. (its the downstairs mains ring) (hold on, its only half the downstairs ring ? hang on its the upstairs ring but only half again this time the opposite side of the house, lets look up there too. Turning off appliances one by one. A monitor... noise goes, everyone in sync. turn it on, noise back everyones out of sync) My suspision is that as the house was a show home so the garrage was an office some urchin has messed up the wiring in adding more lights and sockets for the sales office. As to what caused the monitor to cause some REIN. No idea but flat screen monitors is the one item I would say has caused at least 25% of all REIN I've found excluding december.
Hope this helps
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Topic: REIN Interference, long history line issue. (FTTC) (Read 88928 times)