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Even the DNO get it wrong sometimes.

Kelly Marie Angel

Just recently there's been a lot of clicks and buzzes on my mediumwave listening set up  I tried to trace the cause  checking my station earth an RF earth not mains my areal and all the mains connection but all seemed OK. Anyhow after a few days I found the DNO had dug a hole in the next street and replaced a straight through  joint. I was hoping it had cured the noises but sadly not. About a week later they dug another hole replaced 3 joints in a space of only 50 feet 2 straight through joint and 1 splitter joint I think that's the right name for it. Finally the noise was cured but do the DNO  really look for noise or are they detecting something else like heat or vibration??

  • in reply to Kelly Marie Angel

    One of the situations were RF can be an ignition hazard is where you have a conductive loop in the RF field, that has an internal length about 1/2 the wavelength of the RF (≈ 94 m - 283 m for the MW broadcast band) and that loop is then broken, potentially causing sparking at the break.

    I don't have a copy of BS 6656 here at the moment, but I do have a vague memory of a diagram in it showing exactly that situation with a crane lifting a load, part of the loop made up of the crane jib and lifting cable etc.

    I'm recalling all the above from memory, so no-one reading this should use it as the basis for any safety critical decisions! Slight smile

    Downtown Radio on 1026 kHz, as well as being relatively low power I think was also beamed towards the west / north-west to cover Belfast and beyond, which would also have reduced your chances of hearing it.

    - Ross

  • If Downtown radio was being directed down towards Belfadt then I'm guessing I would of been off the side if the beam or maybe even in the rear lobe either way hearing it would of been virtually impossible. Considering as well that radio Jersey is a huge signal hear although even they get knocked about by the Spanish stations on the same frequency. There's usually at least 2 Spaniards per frequency all up and down the  mediumwave makes it impossible to identify which TX your hearing especially as I don't speak Spanish or any other European language  but that's another matter.

  • in reply to Kelly Marie Angel
    Kelly Marie Angel said:
    2 Spaniards per frequency

    That sounds like it might be a unit of measurement from Monty Python's Flying Circus! Slight smile

  • in reply to Ross C

    That sounds like it might be a unit of measurement from Monty Python's Flying Circus!

    Nah, nobody expects the Spanish Interference...

         - Andy.

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