Hi LF Group
On Sat, 23 Mar 2002, john sexton wrote:
If you do find a model that works, please let us know.
On the base of my own "generalased mirror reflection theory" I just have
derive the formula for ground loss resistance:
R = (lant/lcp)*a*Xc
where:
lant - wire length of antenna,
lcp - wire length of ground system (conterpoint),
a = (eps0*w)/s,
eps0 - dielectric constant (8.85e-12 F/m),
w = 6.28*f - circular frequency,
s - ground conductivity.
Xc = 1/(w*C) - antenna reactance,
C - antenna capasitance.
For 136 kHz and s=1 mSm/m a is about 0.01
The formula is very aproximative but yelds reasonable value of R.
Now I work on more advanced formula wich should be more accurate.
Any coments please!
73 de RA9MB/Alex
http://www.qsl.net/ra9mb
|
