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RFI from LED lights

I'm planning to build a garden room to house my amateur radio equipment.

Naturally I'd like it to be as energy efficient as possible but I'm aware that LED lighting has a reputation for generating interference across the HF bands.

Any suggestions on how to minimise this please?

Mike G8GYW

Parents
  • LED lights are very variable - the ones that are a capacitor dropper, rectifier and strings of LEDs are much better than the ones that pretend to be be a badly made switch mode supply jammed into a small space with no room for decent cooling or filter components.

    But even with the SMPS kind you can achieve quite a lot by adding filtering at the fittings, just as the mains enters the lamp,  a simple  ferrite ring on the cables and some caps L-N can tame things quite noticeably keeping the RF entering that accidental antenna of the house wiring to a minimum.

    Do not overlook the possibility of having different normal and on air lighting states, perhaps one or two filtered lamps, and the rest off.

    The ultimate is 12V LED strip, switched to batteries while receiving, as it is purely passive.

    What bands are you interested in, for HF a lot of the issues are really conducted or at least wiring related,  while VHF tends to be be directly radiated, especially from larger fittings.

    Where are your antennas, how is your rig powered - mains battery etc do you have external earthing.

    LED lights and a radio shack certainly can co-exist but some thought is needed not to accidentally raise the noise floor. Note that it is not just LEDS that have noisy power supplies, computer kit and ADSL lines are another source of HF trouble.

    Mike

    G7VZY

     

Reply
  • LED lights are very variable - the ones that are a capacitor dropper, rectifier and strings of LEDs are much better than the ones that pretend to be be a badly made switch mode supply jammed into a small space with no room for decent cooling or filter components.

    But even with the SMPS kind you can achieve quite a lot by adding filtering at the fittings, just as the mains enters the lamp,  a simple  ferrite ring on the cables and some caps L-N can tame things quite noticeably keeping the RF entering that accidental antenna of the house wiring to a minimum.

    Do not overlook the possibility of having different normal and on air lighting states, perhaps one or two filtered lamps, and the rest off.

    The ultimate is 12V LED strip, switched to batteries while receiving, as it is purely passive.

    What bands are you interested in, for HF a lot of the issues are really conducted or at least wiring related,  while VHF tends to be be directly radiated, especially from larger fittings.

    Where are your antennas, how is your rig powered - mains battery etc do you have external earthing.

    LED lights and a radio shack certainly can co-exist but some thought is needed not to accidentally raise the noise floor. Note that it is not just LEDS that have noisy power supplies, computer kit and ADSL lines are another source of HF trouble.

    Mike

    G7VZY

     

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