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Old December 26th 07, 07:59 AM posted to rec.radio.amateur.antenna
John Smith John Smith is offline
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First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default Standing morphing to travelling waves. was r.r.a.a WARNING!!!

John Smith wrote:
[a bunch of kidding stuff--it's CHRISTMAS!]

There is the equation:

| |2h | b+sqrt(bsquared+asquared) |||
L = .0117|log10|---|----------------------------||| +
| | a |b+sqrt(bsquared+(4*hsquared)|||

| b |
0.0508|sqrt(bsquared+4*hsquared) - sqrt(bsquared+asquared) + - - 2h + a|
| 4 |

whe (and, sorry again, we only have ascii here)

|
(and, | is simply a bracket) or, one of these "({[" or these ")}]" but
|
then, you already knew that ...


L = uH
a = wire rad. in inches
b = wire length parallel to ground, in inches
h = wire height above ground, in inches

Now, this equation is probably a 'bit' more accurate than above--but
d*mn, still looking for that free wire (or, wire-above-ground) equation
for capacitance, for a wire in space ... :-D

Regards,
looking forward to New Years,
JS