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| What "mains conditioner" actually do? |
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| coppercone2:
--- Quote from: Simon on December 17, 2018, 03:07:59 pm ---And you get RF from 50Hz mains.................. --- End quote --- make an adapter to plug into an outlet for a spectrum analyzer (like four series CR HPF at 100KHz) you will find many things there. |
| Simon:
sure, turn you multimeter on in AC volts and wave the probe around..... if you can't hear it who cares? It's like you saying that you have to breath pure oxygen with no nitrogen..... |
| coppercone2:
http://www.ursi.org/proceedings/procGA05/pdf/EP.4(01267).pdf its going to get worse too. What you can;t hear is continuous tones because they will manifest themselves as a constant DC offset and stuff is AC coupled. If you modulate it you get AM radio (envelope detector) with the RC networks and rectifiers in the equipment. A high power RF tone can maybe saturate a high gain stage with the resulting DC offset or bring it closer to saturation on high amplitude signals but if you modulate it you just get another signal you don't want in the band of interest. CDMA is encoded in such a way that the envelope it makes ends up being audible and unpleasant. Amplifiers also have different characteristics at different bias levels (even though they stabilize it as much as possible) so you get different distortions and things with RF induced bias errors Different communications protocols may do something else like modulate a bias with some kinda weird high frequency envelope but when enough things effect other things in a complicated network you might get some kind of audible modulation from all the mixings. |
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