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Repeating spikes on 40m only at night.

At night I get these spike signals running across the 40m band. I feel like I should know what's causing it, but, I just don't know. Any advice?  I'm assuming it's something in my house that only runs at night but, I don't' know what it could be. Almost everything in the house is shut off except my room at night.

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Answers

  • Jon_KF2EJon_KF2E Member ✭✭
    edited July 2018
    It looks like a switching power supply to me. Perhaps something that only gets turned on at night?
  • Ken - NM9PKen - NM9P Member ✭✭
    edited June 23
    My wife’s laptop power supply does this, but only when she is running the computer on the ps.
  • Stan VA7NFStan VA7NF President Surrey Amateur Radio Communications Member ✭✭
    edited June 2018
    Many switching supply options, especially landscape or in-home LED lighting and their ps.
  • edited June 2018
    I have numerous LED lights throughout the house. I can change the ones that are on at night when I'm on the radio and see if it helps.  Thanks!
  • John - K3MAJohn - K3MA Member ✭✭
    edited June 2018
    Try switching off the WNB.  If set too high it sometimes produces similar issues.
  • edited June 2018
    hmmm, never heard of that.  I'll try it.  I do have several LED lights that can be changed back to incandescent for as long as we can still get them. lol  But, I'll certainly try your idea.  Thanks.
  • Pat    KB6YPat KB6Y Member
    edited July 2018
    I have found that my neighbors solar system causes that on mine. They had a company working on it a few weeks ago. When they shut it down for maintenance the spikes immediately went away. You may look at that possibility.
  • Jon_KF2EJon_KF2E Member ✭✭
    edited June 2018
    Seems unlikely that a solar system would be causing his problem at night.

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