[RFI] Power Line Radiated Interference Limits

[Pete Smith N4ZR]

You could always listen to it.

73, Pete N4ZR
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On 6/6/2022 4:24 PM, Hare, Ed, W1RFI wrote:
> Actually, much powerline noise is rather steady, so it will show up as a solid block on a waterfall.  That is diagnostic that the noise is not coming from a switcher, but will not differentiate conclusively between electrical noise and perhaps noise caused by something not powerline-related at all.  The waterfall will not really identify 60- or 120-Hz modulation, so demodulating in AM and looking at the resultant audio is an important step.
>
> Ed
>
>
> ________________________________
> From: RFI<rfi-bounces+w1rfi=arrl.org at contesting.com>  on behalf of Jim Brown<jim at audiosystemsgroup.com>
> Sent: Monday, June 6, 2022 1:45 PM
> To:rfi at contesting.com  <rfi at contesting.com>
> Subject: Re: [RFI] Power Line Radiated Interference Limits
>
> On 6/6/2022 4:28 AM, Hare, Ed, W1RFI wrote:
>> You can also make a .wav or .mp3 file and run it through a free program called 'Audacity" and analyze that spectrum, with the understanding that your receiver bandwidth is usually limited below 200 Hz or so, so that 120-Hz component may be reduced in amplitude.
> The best diagnostic tool, by far, to identify power line noise, as
> opposed to electronic noise, is a broadband WATERFALL of either a
> receiver's IF or RF. Powerline noise and lightning static is arcing, and
> will show up as horizontal lines on a slow waterfall.
>
> Electronic noise is the harmonics of square waves used in switch-mode
> power supplies and other power control electronics like variable-speed
> motor controllers, which show up as vertical humps of noise spaced at
> 10-50kHz, and microprocessor clocks, which sound like carriers and show
> up as narrow vertical lines.
>
> Power line and other impulse noise is present at all frequencies, but is
> best chased at the highest frequencies where it can be heard.
> Traditional techniques apply. Electronic noise must be chased on the
> frequencies where it is heard.
>
> More on this in this here.
> http://k9yc.com/KillingReceiveNoise.pdf  and
> http://k9yc.com/KillingRXNoiseVisalia.pdf
>
> 73, Jim K9YC
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