Scott,
Can you give us a little more info?
Transceiver...?
Were you using any type of filtering when you recorded
the .wav files? DSP? Notch ? Noise Blanker? IF shift/wodth?
If you did have any of these things cranked in, it could
possibly disguise a key element of the noise.
At this point, to me, it sounds a lot like atmospheric noise,
or possbly a storm and static.
I'm not saying that's what it is, but can you get a bit more specific
as to the RX condx and could you possibly record
during different periods of time. early morn, afternoon evening, etc.
If you want to make those recordings you could just send them straight to me
at my e-mail address.
73, Tom K5IID
Scott Ginsburg <k1oa@comcast.net> 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"
> To:
> 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
>>
>>
>>_______________________________________________
>>RFI mailing list
>>RFI@contesting.com
>>http://lists.contesting.com/mailman/listinfo/rfi
>
>
>
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Tom Horton K5IID
Hillsboro, TX
USA-CA All Counties 661---DXCC---5 BAND DXCC
WPX HONOR ROLL---5 BAND WAC---WAZ
Finally back home in Texas after all these years!
"E" sorter for the ARRL W5 QSL bureau
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