Sometime in the summer of 1989 I realised that the S9+ l0dB hash covering the band that peaked up from the northeast was becoming a real nuisance. Fortunately, it was the type of noise that the noise blanker on my Icom IC-751A could cope with fairly easily.
The difficulty was that as soon as any strong station came up nearby on the band the noise blanker became Ineffective and weak signals were completely blotted out
I've had many instances of being unable to complete a weak F2 QSO because of the hash suddenly coming up in the middle. The hash was at its worst on wet and windy days which, in my opinion,
clearly pointed to be overhead power lines being the culprit. One weekend when 6m was quiet I decided to track down the cause of the interference. I usually tackle this by assembling two elements
of a 4 element Jaybeam and bolting it to a short 4-foot pole sticking up through the sun roof of my car. This is connected to my portable 6m receiver.
It was then that I decided that the interference must be coming from the power lines feeding the station and half the area's houses. After obtaining permission
from the farmer owning the land over which the power lines "crossed' it only took a couple of hours to track the interference to an individual pole in the field. Another letter was dispatched to
the local electricity board Engineering Director and three weeks followed when the letter was down through several levels of hierarchy yet again. Eventually, when it arrived at the local
engineering manager's desk, I found them most helpful and they even dispatched an engineer with an FM radio to see whether they could trace the fault. They couldn't. After two months of inaction
and a bit of frustration on my part the engineering manager called me to say that they were switching the line off for maintenance and they would take the opportunity to inspect the identified
pole. I only hoped that I had got it right this time.
The day comes around, I arrive home from work to find a pile of burnt wire on my desk. It seemed a pleased engineering manager had called at my house to show me that on that very pole I selected the insulation on the wire carrying the 240V AC mains had been eaten through and was shorting to the burnt-through copper wire tying it to the insulator. The tie wire consisted of about six turns about 2 inches in diameter which I am sure resonated on or near 50MHz which explained the lack of interference on other frequencies. 6M is now quiet to the northeast. The above efforts took numerous telephone calls over a period of six months but the eventual positive outcome was very satisfying. It was also very interested in locating the problem and wanting to help.