[RFI] Monitor hash

Jim Brown jim at audiosystemsgroup.com
Fri Nov 15 14:28:01 EST 2019

The relevance of posts to this reflector is NOT about how an individual 
"feels," or even what he or she experienced in their shack, but rather 
about RFI. It ain't personal, it's about science.

73, Jim K9YC

On 11/9/2019 9:24 PM, KD7JYK DM09 wrote:
> "OR maybe there are other noise sources overpowering it, and that if you 
> managed to kill them you might hear it. This is the eternal problem with 
> taking someone's advice that "box A" is quiet. We've recently gone 
> through multiple power shutdowns here, thanks to PG&E's failure to 
> maintain their lines. During the last one, I had my K3 running on 
> battery, and as I always do, set the noise floor to the bottom of the 
> display. When the power was restored and all my neighbors' noise sources 
> powered up, the noise floor has risen by 15 dB."
> His concern was discovering noise from the monitor, relative to the 
> current, average noise floor of his typical operating condition. Maybe 
> his location is normally noisy, and acceptable to him, if known, or even 
> noticed, and he hears the monitor when closer to it, which he normally 
> isn't.  His post didn't suggest quantifying an absolute, or even 
> relative to anything else, rather, is this newly discovered condition an 
> unusual circumstance, and, as observed under typical conditions, at that 
> location, no.  It could be a modulated Tesla coil, and not matter, if he 
> can't hear it, despite what it's capable of, so, interesting, but 
> irrelevant.
> The statement stands, for the conditions provided:
> "If you can't hear it, and don't notice a detrimental rise in the noise 
> floor...don't worry about it!"
> He already determined the minor extend of the issue, and was looking for 
> support of his impression.  He is correct.
> Kurt

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