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In Reply to: It seems you do not realize just how silly that passage is, so there goes posted by Victor Khomenko on July 2, 2010 at 06:36:25:
***4. To operate with low noise, a circuit or system must be connected to an earth ground.
No one has ever said that, because it is untrue. This has nothing to do with the subject.
It absolutely does have to do with the subject. Dan Banquer has been making that claim for years, and you yourself essentially said just that in this very thread when you said that connection to an earth ground magically turns a piece of metal into a shield that it wouldn't be otherwise.
DB: Earth ground is cheaper than a faraday shield and in many applications works just as well.
SE: A wire stuck in the ground provides absolutely NO shielding whatsoever.
VK: That wire suddenly turns a piece of metal into a shield.
You also said that an earth ground magically "bleeds the RF energy off the cable shield."
And what exactly does removing from earth ground means? Certainly eliminating the third wire does NOT accomplish that, as the neutral is just as much connected to earth.
Yes, neutral is just as much connected to the earth ground. But unlike the safety ground, neutral is NOT connected to the equipment chassis. Therefore eliminating the third wire removes the circuit from earth ground given that in most cases the circuit's ground is tied to the equipment chassis.
Once again - when working from the power line you are defacto connected to earth.
Really?
You don't use power transformers in your stuff, Victor? You're just taking the AC mains in and directly rectifying it to power your amps and preamps?
That's pretty dangerous.
Most folks these days use power transformers which provide galvanic isolation from the power line. The only connection to earth ground would be in those instances where the safety ground is used which circumvents the galvanic isolation provided by the power transformer. Otherwise, you are decidedly not "defacto connected to earth."
se
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Follow Ups
- RE: It seems you do not realize just how silly that passage is, so there goes - Steve Eddy 08:15:59 07/02/10 (0)
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