[RFI] 160m Noise

Dave Cole dave at nk7z.net
Fri May 5 13:01:25 EDT 2017

Go up as high as possible in frequency, and see if you can pick it up on 
a portable rig...  If so, it is time to start driving the area.  Get a 
Google map of your area, and print it out...  Once you have that, start 
marking down the AM mode, S meter readings at many test points.

That will get you closer...  Move up in frequency if possible and 
continue...  This will get you even closer...  Hopefully you will 
eventually get close enough to hear it at VHF in AM mode, (think 
aircraft radio), and get a small yagi...  Repeat the process until you 
find the house.

73s and thanks,

On 05/04/2017 06:06 PM, Larry Burke wrote:
> Looking for ideas for what the source of this noise might be:
> https://youtu.be/cyzTbAFo9zs
> The noise seems to start at the very high end of the AM broadcast band and
> extend well into 160m. There doesn't appear to be any relationship to
> day/night, 12-hr timer, temperature, rain, etc. It's pretty much there 24/7
> with brief reduction in amplitude (as seen in the video) from time to time.
> I am able to narrow down the direction of the source using my 8-circle
> receive array. Unfortunately that direction is directly into the
> neighborhood across the highway from me as well as into a residential pole
> line (although this doesn't seem line power line noise to me). Near as I can
> tell the noise is confined to the 160m band +/-. I do not hear it on other
> HF bands or VHF.
> The receiver used is an SDRPlay with SDRUno software in the AM mode.
> I apologize in advance for the poor quality of the video. It was taken on
> the spur of the moment with my phone. I'm open to ideas for improving video
> capture off my PC monitor as well.
> - Larry K5RK
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