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Anyone recognize this interference on my waterfall at 20m?

unit9419 Member
edited April 1 in SmartSDR for Windows
I'm getting this very bold pattern - but only on 20 meter band. Does anybody recognize this? See screenshot image.png


  • unit9419
    unit9419 Member
    It appears to be at 244hz intervals across the band
  • Erika - KØDD
    Erika - KØDD Member ✭✭

    Yup Probably something like this: Solving an RFI Problem in a New Monitor - YouTube

  • Erika - KØDD
    Erika - KØDD Member ✭✭
    edited April 1

    THats a link btw.... My Neighbor's PLASMA big screen TV blitzes out 160meters basically all of sections of HF too.

  • unit9419
    unit9419 Member
    [{"insert":"Thank you for your responses.\n It turned out to be caused by two different devices. My Ubiquiti eight port unify switch and my web power switch from Digital Loggers. \nBoth are important components of this remotely controlled station.\nhaven’t tried any baluns or chokes which I understand may help - I don’t know.\n"}]
  • WX7Y
    WX7Y Member ✭✭✭

    Are you running these devices from wall warts? if there 12 to 15 volt devices you can probably run them from the station power supply.

  • Pat_W5WTH
    Pat_W5WTH Keep Radio Fun!!! Member ✭✭

    My “washing machine” QRN looks a lot like that.

  • KD0RC
    KD0RC Broomfield, COMember ✭✭✭✭

    If it is local to your shack and ferrites or other filtering don't work, you might want to think about a noise canceller like the Timewave ANC-4 or the MFJ unit.

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