[RFI] RFI Signature

[Jim Brown]

Thanks Mike. It's interesting that the harmonics get much weaker above 
the 9th, but do keep on going. And I see a bit of triplen with the 3rd 
being stronger. Can you plot with linear frequency?

73, Jim K9YC

On 11/26/2025 4:20 AM, Michael Carter wrote:
> Ask and you shall receive, Jim.
> 
> Via Audacity, 8192 point FFT, Hann windowing, on Jeff's Noise 1a 20 kHz 
> BW .mp3 file.
> 
> 73,
> Mike, K8CN
> P.S. The sharp spectral cutoff above 11 kHz suggests that the original 
> sampling rate was 22 kHz rather than 44.1 kHz or 48 kHz.  I did not 
> inspect the .mp3 file to check the sample rate.