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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Re\:\s+Low\s+loss\s+inductors\s*$/: 6 ]

Total 6 documents matching your query.

1. LF: Re: Low loss inductors (score: 1)
Author: "Andy Talbot" <>
Date: Sat, 26 Feb 2000 14:00:10 +0000
I find that rather impossible to believe - 300m of thick cable being a dummy load at 137kHz ! Go back to the fundamental equations and calculate properly rather than rely on tables and software used
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00265.html (12,311 bytes)

2. LF: Re: Low loss inductors (score: 1)
Author: "vernall" <>
Date: Mon, 28 Feb 2000 09:00:54 +1300
To All from PA0SE dummy rely snip snip Andy says "Go back to the fundamental equations and calculate properly". A good advice but Andy did not follow it himself. snip snip I could not spot a computat
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00278.html (10,917 bytes)

3. Re: LF: Re: Low loss inductors (score: 1)
Author:
Date: Mon, 28 Feb 2000 09:34:06 EST
<< Does any reader have a drum of coaxial cable and a low frequency bridge test set? A practical measurement should sort out a quantitative result. >> Not a test set for measuring at 136k. But abt 70
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00294.html (8,358 bytes)

4. Re: LF: Re: Low loss inductors (score: 1)
Author: "Rik Strobbe" <>
Date: Mon, 28 Feb 2000 17:14:16
The inductance of a coax 'stub' is frequency dependent ! According to the formula for a loss-less cable (given in an earlier mail, should be OK for 136kHz) 70m of RG58 cable should be about 17uH. For
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00297.html (9,444 bytes)

5. LF: Re: Low loss inductors (score: 1)
Author: "john sexton" <>
Date: Wed, 1 Mar 2000 10:06:33 -0800 (PST)
For an estimate of losses : Skin depth of copper at 137kHz is approximately 0.18mm From D = 503 SQRT(Resistivity / Freq / uo) For Cu Resistivity = 1.7E-8 Ohms / m, and uo (magnetic permeability) = 1
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00006.html (10,027 bytes)

6. Re: LF: Re: Low loss inductors (score: 1)
Author:
Date: Wed, 1 Mar 2000 15:37:59 EST
<< So Q = 1722/4.46 = 386, which is somewhat better than your conventional coil. >> If someone actually performs such a measurement (I hope someone can; math is wonderful and theory is indispensible,
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00007.html (8,599 bytes)


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