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Total 13 documents matching your query.

1. Re: LF: Measuring earth resistance (score: 1): Author: [email protected]; Date: Mon, 16 Dec 2002 12:53:09 EST; << Thanks John for a perfect reproduction! >> You are most welcome. John; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00289.html (8,848 bytes)
2. Re: LF: Measuring earth resistance (score: 1): Author: "Dick Rollema" <[email protected]>; Date: Mon, 16 Dec 2002 14:22:16 +0100; Thanks John for a perfect reproduction! 73, Dick, PA0SE: Dick Rollema's noise bridge schematic and a photo of his assembled unit can now be downloaded from: http://lwca.org/library/articles/pa0se/ear; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00306.html (9,758 bytes)
3. Re: LF: Measuring earth resistance (score: 1): Author: "Dick Rollema" <[email protected]>; Date: Mon, 16 Dec 2002 14:14:58 +0100; at 136kHz frequency Upon this Uwe, DJ6WX, remarked: but you use a noise source ie. not 136kHz only. does that not matter ? The noise source indeed produces noise over a wide band of frequencies. But; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00307.html (11,184 bytes)
4. Re: LF: Measuring earth resistance (score: 1): Author: "Dick Rollema" <[email protected]>; Date: Mon, 16 Dec 2002 13:45:58 +0100; To All from PA0SE Jan-Martin, LA8AK. wrote: but suppose the values of the noise generator are for the range 3-30MHz, the coupling capacitors must be increased for VLF The noise bridge was indeed not; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00308.html (10,968 bytes)
5. Re: LF: Measuring earth resistance (score: 1): Author: "jannsen" <[email protected]>; Date: Mon, 16 Dec 2002 11:28:41 +0100; Dick Rollema schrieb: To All from PA0SE ............... ................ Measuring earth resistance at 50Hz has no meaning for the loss at 136kHz because the earth resistance (impedance is more corre; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00311.html (10,644 bytes)
6. Re: LF: Measuring earth resistance (score: 1): Author: [email protected]; Date: Mon, 16 Dec 2002 10:49:22 +0100; fb, but suppose the values of the noise generator are for the range 3-30MHz, the coupling capacitors must be increased for VLF 73 Jan-Martin, LA8AK --Opprinnelig melding-- Fra: [email protected] [mail; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00312.html (10,088 bytes)
7. Re: LF: Measuring earth resistance (score: 1): Author: [email protected]; Date: Sun, 15 Dec 2002 15:28:35 EST; Dick Rollema's noise bridge schematic and a photo of his assembled unit can now be downloaded from: http://lwca.org/library/articles/pa0se/earth/ 73 John Davis; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00316.html (9,332 bytes)
8. LF: Measuring earth resistance (score: 1): Author: "Dick Rollema" <[email protected]>; Date: Sun, 15 Dec 2002 14:59:32 +0100; To All from PA0SE In my previous message I made a mistake in the formula for the reactance of a capacitor. In this repeat the correct formula is used. There were some requests for info on the way I m; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00322.html (13,919 bytes)
9. Re: LF: Measuring earth resistance (score: 1): Author: "Dick Rollema" <[email protected]>; Date: Sat, 14 Dec 2002 09:46:42 +0100; when resistance I guess you mean "earth conductivity", which is the reverse of "earth resistance" and moves in the opposite way between summer and winter! 73 Costas SV1XV; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00334.html (10,160 bytes)
10. Re: LF: Measuring earth resistance (score: 1): Author: [email protected]; Date: Sat, 14 Dec 2002 01:30:08 EST; Sorry, all. I meant to send that response directly to Dick. Sometimes my mail client chooses its own reply-to address rules, seemingly at random, and I don't always notice before clicking on Send. Jo; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00336.html (9,837 bytes)
11. Re: LF: Measuring earth resistance (score: 1): Author: [email protected]; Date: Sat, 14 Dec 2002 01:24:18 EST; << In the first version of this e-mail the circuit diagram was included but it did not pass the reflector. >> Hi Dick, As usual, I'll be happy to host the diagram on the LWCA site if you'd like to ha; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00337.html (9,967 bytes)
12. Re: LF: Measuring earth resistance (score: 1): Author: "Costas Krallis SV1XV" <[email protected]>; Date: Fri, 13 Dec 2002 19:49:53 +0200; My measurements support the findings by Alan Melia. The earth resistance is higher in winter than in summer and is maximum when the earth is soaked with water. When the water freezes the resistance; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00350.html (9,732 bytes)
13. LF: Measuring earth resistance (score: 1): Author: "Dick Rollema" <[email protected]>; Date: Fri, 13 Dec 2002 13:39:43 +0100; To All from PA0SE There were some requests for info on the way I measured the earth resistance of my aerial system. In 1988 I made an impedance bridge with a noise source. In the first version of thi; /rsgb_lf_group-archives/html/rsgb_lf_group/2002-12/msg00357.html (12,534 bytes)

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