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VK2ZRG > TECH 28.05.06 10:06l 45 Lines 1299 Bytes #999 (0) @ WW
BID : 2351_VK2ZRG
Read: DL1LCA GUEST
Subj: Skin depth in copper
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Sent: 060528/0534Z @:VK2WI.#SYD.NSW.AUS.OC #:15820 [SYDNEY] FBB7 $:2351_VK2ZRG
From: VK2ZRG@VK2WI.#SYD.NSW.AUS.OC
To : TECH@WW
VK2ZRG/TPK 1.83d Msg #:2351 Date:28-05-06 Time:5:35Z
Hello All,
My latest programme calculates skin depth for 14 different metals.
It's more or less finished; I just have to verify the resistivity values
for the 14 metals. Yesterday I calculated the skin depth for copper at
50 Hz. The answer was 9.35 millimetres which seemed rather low at first
glance. So today I've tried three different formulas and got essentially
identical results. So here is a bit more trivia on skin depth.
Frequency Skin depth
50 Hz 9.35 mm
1 kHz 2.09 mm
20 kHz 0.47 mm
1 Mhz 66.1 microns or micro metres
3.5 Mhz 35.3 microns
14 Mhz 14.7 microns
30 Mhz 12.1 microns
100 Mhz 6.61 microns
144 Mhz 5.51 microns
1296 Mhz 1.84 microns
10000 Mhz 0.66 microns
Bet you thought skin depth at 50 Hz was irrelevant, I did until I
did the sums.
This is one of the formulas that I tried. (Only for non magnetic metals.)
Skin depth (mm) = 0.5*(R/F)^0.5
F is frequency in MHz, R = 0.01742 for copper
73s from Ralph VK2ZRG@VK2WI.#SYD.NSW.AUS.OC
Taglines by Colin Coker G4FCN
C Program run, C Program Crash...ReWrite in Pascal!
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