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1. [Amps] meter shielding (score: 1): Author: "Chris" <rfcrazy@cox.net>; Date: Sat, 26 Mar 2005 12:48:48 -0800; Hello to the group, I have a question in regards to rf getting into my filament meter. I put chokes on the leads to the meter to keep rf out, but its not coming into the meter thru the wires, it just; /archives//html/Amps/2005-03/msg00587.html (6,330 bytes)
2. Re: [Amps] meter shielding (score: 1): Author: G3rzp@aol.com; Date: Sat, 26 Mar 2005 17:18:10 EST; have a question in regards to rf getting into my filament meter. What sort of meter? I've never yet really got the RF out of things enough to make sense of a digital meter...... 73 Peter G3RZP ______; /archives//html/Amps/2005-03/msg00589.html (6,339 bytes)
3. Re: [Amps] meter shielding (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 26 Mar 2005 16:37:08 -0800; Chris -- I use an ordinary chassis for a meter shield. http://www.somis.org/PBox_top_inside.jpeg The chassis at the top of the picture is the meter shield. The meter leads are fed through a Cu tube l; /archives//html/Amps/2005-03/msg00591.html (7,917 bytes)
4. Re: [Amps] meter shielding (score: 1): Author: "Chris" <rfcrazy@cox.net>; Date: Sun, 27 Mar 2005 00:31:55 -0800; Thanks to those who replied to my question. I am going to use some kind of aluminum box and some feed thru caps. Have a wonderful Easter! Chris Hi Chris: The opening for the meter provides an opening; /archives//html/Amps/2005-03/msg00597.html (7,565 bytes)
5. Re: [Amps] meter shielding (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sun, 27 Mar 2005 16:32:03 -0500; Chris There's one other way if nobody has said it. You can use double sided pc board. Make a small box out of pieces of board and solder it up. I've seen whole projects built this way. This way, you; /archives//html/Amps/2005-03/msg00614.html (9,096 bytes)
6. Re: [Amps] meter shielding (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 27 Mar 2005 23:33:15 +0100; One thing to note is that feedthrough caps only work if they have a source impedance that is sufficiently high. If the source impedance is low, then they are ineffective. The figures you see for atte; /archives//html/Amps/2005-03/msg00616.html (8,770 bytes)
7. Re: [Amps] meter shielding (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Sun, 27 Mar 2005 19:03:42 -0500; Dear Chris, Some methods I employ in construction of amplifier metering involve the use of ceramic disk bypass capacitors at both ends of all control leads, everywhere. Another method is to use a sma; /archives//html/Amps/2005-03/msg00618.html (8,108 bytes)
8. Re: [Amps] meter shielding (score: 1): Author: "Chris" <rfcrazy@cox.net>; Date: Sun, 27 Mar 2005 19:46:38 -0800; These both sound like great ideas Will. The meter is in a confined area so a custom copper clad box may be the solution if I can't find a bud box with the right dimensions. Thanks for the info. Chris; /archives//html/Amps/2005-03/msg00620.html (9,905 bytes)
9. Re: [Amps] meter shielding (score: 1): Author: G3rzp@aol.com; Date: Mon, 28 Mar 2005 02:49:59 EST; Bear in mind that even double sided copper clad is a bit too thin to be an effective shield at 80 or 160. From memory, you need about 15 mil (.015 inch) to be totally affective at 2MHz i.e. 10 skin t; /archives//html/Amps/2005-03/msg00623.html (7,277 bytes)

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