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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
Path: DB0FHN<DB0FOR<DB0SIF<DB0FHK<DB0LJ<DB0RES<DK0WUE<SP7MGD<SR1BSZ<CE8FGC<
      ZS0MEE<ON0BEL<VK7AX<VK2TGB<VK2IO<VK2WI
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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