[RFI] 160m Noise

Dave Cole dave at nk7z.net
Fri May 5 15:47:58 EDT 2017

Hopefully they will find it soon, please let me know what it is...  It 
is interesting sounding.

73s and thanks,

On 05/05/2017 12:05 PM, Larry Burke wrote:
> Thanks, Dave. Did that with no luck, unfortunately. That's not to say I
> shouldn't try doing it again, but the first few efforts were futile.
> I forgot to mention in my original post that we have a very good noise team
> at the public utility here. They work well with the amateur community and
> have been out three times looking for this particular noise with no luck.
> It's the first one they have not been able to find at this location and I
> have called them many times. They're equipped with some good equipment and
> are quite knowledgeable. Often, if the source is something simple like a
> lightning arrestor, they fix it on the spot.
> - Larry K5RK
> -----Original Message-----
> From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Dave Cole
> Sent: Friday, May 05, 2017 12:01 PM
> To: rfi at contesting.com
> Subject: Re: [RFI] 160m Noise
> 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,
> Dave
> NK7Z
> http://www.nk7z.net
> 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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