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fluorescent lamps interferance

Discussion in 'Boat Electronics' started by chuck, Apr 17, 2005.

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  1. chuck

    chuck Guest

    Hello David,

    What radio reception are you concerned with?

    Interference from the switch-mode power supply in the lamp
    fixture could be radiated, or it could be getting to the
    radio through the 12 volt circuit.

    RadioShack ferrites could help, but I think we need more info.

  2. chuck

    chuck Guest

    Ok, then the interference is being radiated. Take the radio
    out on deck and see if the interference drops to an
    acceptable level when you are 10-15 feet from the lamp. If
    so, then the answer may be to use an external antenna.
    Nothing elaborate is necessary. Maybe a twisted pair from
    the radio antenna jack to the antenna would help cancel any
    radiation from the lamp to the feedline.

    Can't think of anything else to try that wouldn't be "over
    the top". Someone else may have a better suggestion.

    Good luck, David.

  3. Doug Dotson

    Doug Dotson Guest

    I'd say that turning off the flourescent lights when using the radio is the
    simplest solution. Install an indandesent for use during those times if you
    need light at the rig.

  4. david

    david Guest

    Hi all
    Is there an easy soloution to stop the interfrence that florescent lamps the
    12volt ones from tandy/dick smith cause to radio reception.
  5. david

    david Guest

    Hello Chuck
    Thank you for your reply.
    Its just an AM/shortwave reciver it makes no diffrence if it works from the
    ship supply or the radios internal batteries.
    the florescent lamps internals are a transformer a switch a transistor on a
    heat sink 3or 4 capactors and a diode which i disabled to avoid the .6volt
    drop that seemed to reduce the interfrence a bit (i think).
    the above is from memory I'd have to open one up again to be more accurate.
  6. Me

    Me Guest

    that's an easy question....the answer.....TURN THEM OFF.......

  7. There are RFI eliminators that can be added to florescent lighting
    fixtures, as an after-market upgrade. GE made all the ones that
    I had installed in every Cannery Office in alaska. This was before
    the advent of computer networks in the offices, and when that happened
    we moved the radio's and antennas out away from the offcies and clear
    out in the brush, and just left the Control Heads, back in the plants.
    SEA 322's, 330's, and 325's work really well, at the end of 3000 ft of
    telephone wire.

    Bruce in alaska there is always a way to fix a problem, if money
    isn't a part of that problem......
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