[RFI] Monitor hash

KD7JYK DM09 kd7jyk at earthlink.net
Sun Nov 10 00:24:19 EST 2019

"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 

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.


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