I generated a FFT spectrum estimate of Jeff's 'Noise 1a 20 kHz BW' audio file
and attempted to post it to the reflector, forgetting of course that this
reflector doesn't allow image content embedded in posts. I sent that email
direct to K9YC and W4DD, and hope that Jeff can add it to his Google Drive page.
For anyone wishing to generate their own spectrum estimate, I used Audacity
with FFT size 8192 points, Hann windowing. The 60 Hz line and its harmonics
are prominent.
73,
Mike, K8CN
________________________________
From: RFI <rfi-bounces+mike.carter=unh.edu@contesting.com> on behalf of Jim
Brown <jim@audiosystemsgroup.com>
Sent: Tuesday, November 25, 2025 11:12 PM
To: Rfi List <rfi@contesting.com>
Subject: Re: [RFI] RFI Signature
CAUTION: This email originated from outside of the University System. Do not
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Can you do an FFT of this, Don?
Jim
On 11/25/2025 5:09 PM, Don Kirk wrote:
> One is the oscilloscope display of your noise which I called "RFI
> being investigated" when you were using 20 KHz bandwidth. T
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