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Antenna noise on my 6300

All this is antenna based interference.

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Answers

  • Bob K8RC
    Bob K8RC Member ✭✭✭
    edited May 2020

    You have now become aware of how noisy the world has become.

    Everything from the drive electronics on a variable-speed furnace fan to the circuits built into LED light bulbs is making noise. The harmonics of the pulse-width modulated square waves in these things make those "humps".

    Do you remember learning somewhere along the way that a square wave is made up of a fundamental sine wave and an infinite number of its odd-order harmonics?

    Well, now you know what that looks like on a spectrum analyzer.


  • Dan -- KC4GO
    Dan -- KC4GO Member
    edited March 2018
    Look to your home for a switching power supply or something like that. WALL WART ... In my case it was the power supply for and external hard drive see attached picture. I turned off breakers one by one until the noise went away... This went all the way up into 10 meters.  See Dr. Howard S. Whites paper on how to build a quite station https://community.flexradio.com/flexradio/topics/how-to-build-a-quiet-station

    Hope this helps...
    Regards & 73's
    Dan --- KC4GO

    This was my mess !!!
     image
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited June 2020
    I get a pattern very similar to that from the under cabinet halogen lights in the kitchen. They are powered by an old wall-wart power supply.  It wipes out 160-10 meters.  I haven't had the opportunity to replace it yet.
  • k3Tim
    k3Tim Member ✭✭✭
    edited December 2016
    Agree with Bob, this looks like the same i observe on a " Maytag Neptune washing machine RFI " (Google it).   I've tried grounding the wash machine case to the  copper pipes and wrapped the AC cord 15 times thru a huge 31-mix ferrite to no effect whatsoever. I believe one has to attack it at the source itself, the motor leads.

    As mentioned, it's a noisy world now.. 

    In the middle of the night around here, the RFI is nonexistent except for a few spurs that I can live with.
    I find it's easier to track down RFI problems at 2:00AM to 5:00AM or so when the outside sources are generally off.  Also that let me bag K1N this morning on RTTY!

    Good Luck +

    73's
    k3Tim

  • George KF2T
    George KF2T Member ✭✭✭
    edited February 2019
    So sorry you're now "enjoying" all the radio spectrum can offer! I spent over a year obsessively tracking down noise before I called it quits and realized there was some stuff I couldn't clean up (other people's washing machines, pool pumps, plasma TV, etc. KY6LA has a great presentation on cleaning up your own house. A recounting of my experiences is on my QRZ page. There is A LOT you can do. I also found the MFJ noise canceller (phase device) helps with some sources. I think it was Tim who first told me what I call the Flex Paradox - the best and worst thing about a Flex radio is the spectrum display coupled with that awesome receiver. Now you can obsess about noise you never knew about before! And wow, what a difference when you succeed. GOOD LUCK!

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