On Monday 30 January 2017 10:52:39 Alan Corey wrote: > There's electrostatic shielding and electromagnetic shielding, I'm not > sure which is which type. A radio signal has both components, the > electrostatic doesn't carry far. A shielded loop antenna is mostly > electrostaticly shielded and made from shielded wire (coax) wire but a > good receiving antenna in noisy environments like a city. > > Where you've got those individual wires going to terminal strips try > braiding as much as you can of them, because that makes them into > twisted pairs. Especially for the wires in differential pairs an > induced noise spike will cause currents in opposite directions that > cancel each other.
Chuckle. Alan, you are typing to a electronics tech, with 68 years experience, and a broadcast engineer with 53 years experience. :) And I am gradually getting this thing wrapped in suitable noise cancelation means. I'll get there, and I may yet ask more questions. But I'll freely admit this is the worst case I have ever dealt with. I came home today with enough stuff from the electrical aisle to put the vfd in well isolated filtering on both sides of it, metallic conduit all the way to the motor, and brick wall filtering in series with the line power. And it will all be done before power is re-applied. 7i90's are 59 USD each. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>
