[RFI] Noise Level During Power Outage

[Jim Brown]

On 2/1/2023 4:52 AM, K9MA wrote:
> Besides the preponderance of 120 Hz harmonics in the AM audio, the very 
> broadband nature of line noise is usually the main indicator.

120 Hz is also a strong component of electronic noise generated by power 
supplies and power control equipment. The audio spectrum is not a great 
clue -- the RF/IF waterfall shows where the bodies are buried.

73, Jim K9YC