[RFI] 160m Noise

Frank N. Haas KB4T utility.rfi.pro at gmail.com
Fri May 5 16:08:12 EDT 2017

The utility team may not have proper antenna systems to DF such low
frequency signals.

The Radar Engineers Model 200 series receivers can receive that low but a
useful antenna is needed.

If a directional antenna for 1.8 MHz is not available, a road trip search
will take longer but should work.


Frank Haas KB4T
Utility Interference Investigator

On May 5, 2017 3:48 PM, "Dave Cole" <dave at nk7z.net> wrote:

> Hopefully they will find it soon, please let me know what it is...  It is
> interesting sounding.
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
> 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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