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Thread: Strange nose that I get on 75 meters.

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  1. #1
    Join Date
    Jan 2000
    Location
    Lincoln Park, Michigan
    Posts
    298

    Question Strange noise that I get on 75 meters.

    It's a oddball one too. It moves, ever.....so....slowly down the band. As far as I know; I only get it on 75 meters. I thought maybe it was some sort of solar stuff. But I seem to remember years ago on CB, we'd get a quick noise, which sounds like a huge carrier and it would go back really fast! This is slow and quite annoying. Since I filmed that video the noise has moved to 3.923.61

    Also in the mornings, on 3.865 and at like 7:00 a.m. or so... I start hearing this pulsing noise. It sounds like someone turning on a Hottub for like a few seconds and then shutting it off and then back on. Sort of a rushing sound --- and yes, this too drives me nuts.

    Here's the video:



    Anyone got any ideas on this one?

    Thanks!
    Last edited by K8CPA; 04-06-2012 at 06:28 AM. Reason: added info

  2. #2
    Join Date
    Feb 2004
    Location
    Bakersfield, CA
    Posts
    4,447

    Default

    Could be a lot of things. Drifting in frequency is a little different and that is usually caused by a device like a switching mode power supply, computers and other devices in the immediate area. The first thing to do is find out if it is coming from your home. To do this you have to power down the entire house including any battery backup temporary power devices (UPS) and anything else that has a battery in it. Now using your own radio on a battery, see if the noise went away. If it did then the problem is in your house. If it didn't go away then you would have to take the rig out for a walk around the neighborhood and see if it goes up anywhere. Once you have found the peak that will be just about the location of the noise source. This may take sometime and the noise source can be elusive.
    I have been listening on 80/75 and haven't heard this on the west coast.
    You will have to monitor what conditions are around when it occurs. Like it gets worse, or better during and after a rain. Keep tabs on the temperature and see if that has any relation. The time of day it shows up. Stuff like this will help eliminate some things and point to others.
    Hope this helps
    73
    Gary
    Last edited by KO6WB; 04-06-2012 at 11:16 AM.

  3. #3

    Default

    My nose gets bent out of shape every time I listen to 75m.
    73, Cecil, www.w5dxp.com
    Can CO2 emissions save us from the coming ice age?

  4. #4
    Join Date
    Jan 2000
    Location
    Lincoln Park, Michigan
    Posts
    298

    Default

    Quote Originally Posted by W5DXP View Post
    My nose gets bent out of shape every time I listen to 75m.
    It was a typo, yes, I know.

  5. #5
    Join Date
    Jan 2008
    Location
    St. Mary's County Md since 2000
    Posts
    7,255

    Default

    I have the same sort of noise. It's local, probably some sort of power supply for/or electronics.

    Switching power supplies often drift in frequency because they are basically a free running oscillator.

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