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Total 18 documents matching your query.

1. [RFI] Earth isolation (score: 1): Author: "George Shaw" <george.shaw@ukf.net>; Date: Wed, 8 Sep 2004 19:29:12 +0100; Has anyone any ideas or suggestions on preventing interference from the earth connection in the shack? Is there a way of isolating the earth (probably a contradiction in terms) to prevent RFI getting; /archives//html/RFI/2004-09/msg00043.html (7,015 bytes)
2. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Sep 2004 14:24:58 -0500; MDS? Is there some particular problem you are having? Tom Rauch has observed, and I generally agree, that most "RF in the shack" problems are really antenna problems. I would extend that statement to; /archives//html/RFI/2004-09/msg00044.html (9,491 bytes)
3. Re: [RFI] Earth isolation (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 8 Sep 2004 22:39:22 +0100; Jim Brown wrote: On Wed, 8 Sep 2004 19:29:12 +0100, George Shaw wrote: Has anyone any ideas or suggestions on preventing interference from the earth connection in the shack? Is there a way of isolati; /archives//html/RFI/2004-09/msg00045.html (9,911 bytes)
4. Re: [RFI] Earth isolation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 8 Sep 2004 18:20:58 -0400; accidental *to*. Whatever to enlist as a Hi Ian, I think I know what you meant, but I'm not sure I agree with that picture. RF that is accidentally picked up doesn't need to flow anywhere. It isn't; /archives//html/RFI/2004-09/msg00046.html (10,482 bytes)
5. Re: [RFI] Earth isolation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 8 Sep 2004 18:26:02 -0400; interference from the the earth back up the George, Do the right thing and correct whatever is causing the common mode current to appear on the ground. The ground MUST have a low common mode impedan; /archives//html/RFI/2004-09/msg00047.html (7,683 bytes)
6. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Sep 2004 22:44:18 -0500; What you really did was reduce the current flowing in those unintential antennas by adding impedance to the return path. That was a band-aid made necessary by the pin 1 problems in the gear. The more; /archives//html/RFI/2004-09/msg00048.html (8,267 bytes)
7. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Sep 2004 23:12:41 -0500; That is not the model I am thinking of. Rather, it is of a cable acting as a short long-wire antenna, and there is a current path for it, just as with any antenna. The current path for many ( most) l; /archives//html/RFI/2004-09/msg00049.html (9,761 bytes)
8. Re: [RFI] Earth isolation (score: 1): Author: "Dennis Berry" <dennisberry@worldnet.att.net>; Date: Thu, 9 Sep 2004 00:22:44 -0400; Jim, This is a real interesting discussion. I've always struggled with grounds. I think my mind just goes into lock up mode. When you talk to someone who really knows EMC/EMI issues, they make it sou; /archives//html/RFI/2004-09/msg00050.html (8,864 bytes)
9. Re: [RFI] Earth isolation (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 9 Sep 2004 08:07:12 +0100; Tom Rauch wrote: I think I know what you meant, but I'm not sure I agree with that picture. RF that is accidentally picked up doesn't need to flow anywhere. It isn't a bucket of something we have to; /archives//html/RFI/2004-09/msg00051.html (9,393 bytes)
10. Re: [RFI] Earth isolation (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 9 Sep 2004 08:23:02 +0100; Jim Brown wrote: On Wed, 8 Sep 2004 22:39:22 +0100, Ian White, G3SEK wrote: The cure was to place an RF block in the shack mains feed, using a three-wire filter which includes a ground-line choke. Wh; /archives//html/RFI/2004-09/msg00052.html (10,141 bytes)
11. Re: [RFI] Earth isolation (score: 1): Author: "Dennis Berry" <dennisberry@worldnet.att.net>; Date: Thu, 9 Sep 2004 07:17:25 -0400; Jim, This is a real interesting discussion. I've always struggled with grounds. I think my mind just goes into lock up mode. When you talk to someone who really knows EMC/EMI issues, they make it sou; /archives//html/RFI/2004-09/msg00053.html (9,310 bytes)
12. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 09 Sep 2004 07:50:06 -0500; No. You have several misunderstandings here. 1. The so-called pin 1 problem is a mis-wiring of a SHIELD connnection. 2. It is NOT associated with intentional antennas -- that is, the antennas we norm; /archives//html/RFI/2004-09/msg00054.html (11,595 bytes)
13. Re: [RFI] Earth isolation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 9 Sep 2004 09:27:50 -0400; applies must have in. The system is not a constant current source and a constant impedance system that provides a fixed amount of current that has to flow somewhere else. The system is full of unint; /archives//html/RFI/2004-09/msg00055.html (10,925 bytes)
14. RE: [RFI] Earth isolation (score: 1): Author: "EDWARDS, EDDIE J" <eedwards@oppd.com>; Date: Thu, 9 Sep 2004 08:48:49 -0500; I think what Tom is saying is if you change the impedance of a common-mode "Circuit" by adding an RF choke to the cable entrance, current no longer flows at all so it doesn't have to go anywhere sinc; /archives//html/RFI/2004-09/msg00056.html (7,852 bytes)
15. Re: [RFI] Earth isolation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 9 Sep 2004 10:03:52 -0400; is, for example, lead routes around components to the chassis as the center box'? Jim handled that all well Dennis, but let me add a few things. Most of the RF-in-shack problems come from Marconi an; /archives//html/RFI/2004-09/msg00057.html (10,127 bytes)
16. RE: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 09 Sep 2004 09:10:06 -0500; Leave out the word "characteristic" -- it's not a transmission line. Just plain old series impedance. Now the sentence is right on! Yes Again, not the right words, but the right problem. The single p; /archives//html/RFI/2004-09/msg00058.html (7,745 bytes)
17. RE: [RFI] Earth isolation (score: 1): Author: "EDWARDS, EDDIE J" <eedwards@oppd.com>; Date: Thu, 9 Sep 2004 10:21:18 -0500; You're correct Jim-- wrong word choice. "Characteristic Impedance" has a specific meaning in electrical theory related to transmission lines. My goof. That's why peer review for papers is so importan; /archives//html/RFI/2004-09/msg00059.html (8,929 bytes)
18. RE: [RFI] Earth isolation (score: 1): Author: Cortland Richmond <ka5s@earthlink.net>; Date: Thu, 9 Sep 2004 10:08:07 -0700 (GMT-07:00); Jumping in late here... the green wire, AC safety ground must be able to carry enough current to open a fuse or circuit breaker if a hot-to-chassis AC power short develops, and to keep the chassis-to; /archives//html/RFI/2004-09/msg00060.html (10,203 bytes)

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