[Elecraft] [K3] Using K3 for relative noise survey

[Walter Underwood]

At the FCC website, you can search for registered communications towers within a radius of a location.

https://www.fcc.gov/media/radio/asrn-within-radius <https://www.fcc.gov/media/radio/asrn-within-radius>

There are 56 registered towers within 10 km of my house.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Aug 1, 2017, at 10:48 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> Thanks Jim.  I live out in the country, at least 30 miles from any high power AM BC, so haven't had this issue or evaluated that important capability.  The little FunCube Dongle Pro+ also has filtering, but I don't know how good it is. It covers only 192 kHz at a time, but is 16-bits, so has greater dynamic range. The SDRPlay RSP2 is probably more useful, thanks to its greater display bandwidth.
> 
> With any of these radios, N7WS's calibration method (or something like it) should be used. Another suggestion -- take your test setup to a spot in the middle of nowhere -- no buildings, no power lines, no solar or wind arrays -- and look at the noise floor there. Save those data as a reference -- that's your objective at a new QTH.
> 
> Also, look around the area, and apply common sense. Are there houses? Farms? Businesses? Radio towers? Cell towers? All are likely to have dozens of noise sources, either now or in the future. My applications note on chasing RFI talks about many of them.
> 
> 73, Jim K9YC
> 
> On 8/1/2017 10:21 AM, Jim Miller wrote:
>> I have an RSP1 and it works well with the free software available to do spectrum work. I particularly like HDSDR's ability to make long term recordings.
>> 
>> However I found it of limited use on 160m due to AMBC interference since it doesn't have much (or any?) front end filtering. I'm 30 miles north of Baltimore where the AMBC originates.
>> 
>> I put a brickwall filter in front of it and it worked very well afterwards.
>> 
>> I've recently bought an RSP2Pro which has better filtering in it which I hope will eliminate the need for the external filter. I haven't had time to even plug it in yet.
> 
> 
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