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Re: [RFI] need ideas on hunting down QRN-like noise source -.wav files

To: Scott Ginsburg <k1oa@comcast.net>
Subject: Re: [RFI] need ideas on hunting down QRN-like noise source -.wav files
From: "Dale J." <dj2001@mn.rr.com>
Date: Wed, 16 Jun 2004 18:37:00 -0500
List-post: <mailto:rfi@contesting.com>
Sounds like electrical storm static. Otherwise I don't know, never heard anything like that at my QTH. Would be good if you could ID it.

Dale, K9VUJ


On Jun 16, 2004, at 18:21, Scott Ginsburg wrote:



Alex, KR1ST, has done me a huge favor by posting a couple of .wav files on his website which contain about 10 seconds each of my HF noise, one recorded on AM, the other on upper sideband.

They are:

http://www.kr1st.com/k1oa/k1oanoise-20M-AM-6-15-04.wav
http://www.kr1st.com/k1oa/k1oanoise-20M-USB-6-15-04.wav

If anyone needs longer samples please let me know and
I can generate another file.

                                        tnx and 73,
                                        Scott, K1OA


Can you record this noise at it's worse and put it in a .wav file so we can
listen to it. Hearing it can give us some ideas.
----- Original Message ----- From: "Scott Ginsburg" <k1oa@comcast.net>
To: <rfi@contesting.com>
Sent: Monday, June 14, 2004 8:50 PM
Subject: [RFI] need ideas on hunting down QRN-like noise source
I'm currently plagued with two sources of HF RFI, and for the
moment am concentrating on locating one of them. Any help
I can get from the RFI sleuths on the list would be greatly
appreciated!

The noise in question showed up about a month ago, and appears
as a combination of white noise and random, rapid static crashes.
The static crashes, or bursts, sound a lot like heavy QRN.

It is typically the loudest on 14 MHz, and can be heard from 7-24 MHz
when it's at its worst, with peaks on 14 MHz of 10 over S9. I hear no
buzzing when listening on AM. My noise blanker has no effect.

Its presence can't be correlated with weather. I hear it on both wet
and dry days, wind or no wind.

It seems to peak from a certain direction when I listen on my HF log
periodic. I've driven the neighborhood streets (up to 2 mi away) with my
706 and hamstick in the car and can hear what I think is the noise in
certain locations, but never loud enough to be a "smoking gun". I
verified it's not coming from my house, by killing power and listening
in the driveway on my 706 to the noise.


Early morning is typically very quiet. At 6:30 AM local time I usually
hear only silence, or a few weak bursts of noise which sound like the
problem. It typically peaks by noon. I almost always hear it in the
evening and at night.


Any hints anyone might have as to what a possible source might be or
the best way to continue trying to track this down would be
appreciated.

                                                 73,
                                                 Scott, K1OA


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