Message-ID: <37E1250D.69B2AD45@nephro.uni-kiel.de>
Date: Thu, 16 Sep 1999 19:12:45 +0200
From: "Peter W. Schnoor" <pwsch@nephro.uni-kiel.de>
Organization: University of Kiel, Clinic of Nephrology
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: LF-antenna with top load
References: <000d01beff9e$9ff064c0$3596b38f@w8k3f0>
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Hello Group,
Hi Dick,

Question to PA0SE: Dick, did you choose 1.5mm of diameter or
radius? Some programs are using "radius" other "diameter"...

Here are the results from simulations with MININEC
algorithms.

Ground: 0.005 S/m, 13 (dielectric const.)
Diameter of all wires: 1.5 mm 
(copper and 0 for Rs)
Max error of wire lengths: <1%
Length of vertical section: 10m
Lengths of segments: 1m ("pulses" for specialists...)

I'm including the maximum gain as the program reports at
"x-direction" (g in dBi) and some of Dick's results for
comparison (">...").

> 1. No top load
> Z = 0.073 - j 17792 (ohm)

z = 0.0824 - j17761
g = -6.6 dB

> Rs: 7.8 milli-ohm

Rs = 0.0079 Ohms

> 2. One horizontal top load wire of 5 m
> Z = 0.111 - j 12550

z = 0.1244 - j12533
g =-6.0 dB
 
> Rs: 13.9 milli-ohm

Rs = 0.00138 Ohms
 
> 3. One top loading wire of 5 m, sloping down under 45 degrees
> Z = 0.108 - j 12993 

z = 0.1195 - j12945
g = -6.7 dB
 
> Rs: 11.2 milli-ohm

Rs = 0.0111 Ohms
 
> 4. One horizontal top loading wire of 10 m
> Z = 0.148 - j 9659

z = 0.1663 - j9645
g = -6.1 dB
 
> Rs: 17.6 milli-ohm

Rs = 0.0176 Ohms
 
> 5. One top loading wire of 10 m, sloping down under 45 degrees
> Z = 0.142 - j 9898 

z = 0.1584 - j9896
g = -8.3 dB
 
> Rs: 9.94 milli-ohm

Rs = 0.01 Ohms
 
> 6. One horizontal top loading wire of 20 m
> Z = 0.221 - j 6626

z = 0.2479 - j6602
g = -6.7 

> Rs: 22.1 milli-ohm

Rs = 0.022 Ohms
 
> 7. Two horizontal top loading wires of 5 m  (T-antenna)
> Z = 0.133 - j 9914

z = 0.1491 - j9903
g = -5.7
 
> Rs: 17.4 milli-ohm

Rs = 0.0174 Ohms

> 8. Two top loading wires of 5 m, sloping down under 45 degrees
> Z = 0.127 - j 10466

z = 0.1420 - j10430
g = -6.8
 
> Rs: 13.2 milli-ohm

Rs = 0.013 Ohms
 
> 9. Two horizontal top loading wires of 10 m (T-antenna)
> Z = 0.173 - 6793

z = 0.1948 - j6786
g = -5.9
 
> Rs: 22.0 milli-ohm

Rs = 0.0219 Ohms
 
> 10. Two top loading wires of 10 m, sloping down under 45 degrees
> Z = 0.163 - j 6987

z = 0.1843 - j7027
g = -8.8
 
> Rs: 10.6 milli-ohm

Rs = 0.0107 Ohms
 
> 11. Two horizontal top loading wires of 20 m (T-antenna)
> Z = 0.230 - j 4142

z = 0.2593 - j4138
g = -6.4
 
> Rs: 26.0 milli-ohm

Rs = 0.0261 Ohms
 
> 12. Four horizontal top loading wires of 5 m (90 degrees between wires in horizontal plane)
> Z = 0.156 - j 7394

z = 0.1748 - j7386
g = -5.6
 
> Rs: 21.4 milli-ohm

Rs = 0.0212 Ohms

> 13. Four top loading wires of 5 m, sloping down under 45 degrees
> Z = 0.147 - j 7948

z = 0.1654 - j7985
g = -6.9
 
> Rs: 14.9 milli-ohm

Rs = 0.0148 Ohms

> 14. Four horizontal top loading wires of 10 m
> Z = 0.193 - j 4529

z = 0.2165 - j4524
g = -5.7

> Rs: 25.9 milli-ohm

Rs = 0.0257 Ohms
 
> 15. Four top loading wires of 10 m, sloping down under 45 degrees
> Z = 0.180 - j 4689

z = 0.2035 -j4726
g = -9.1
 
> Rs: 10.8 milli-ohm

Rs = 0.0109 Ohms
 
> 16. Four horizontal toploading wires of 20 m (T-antenna)
> Z = 0.232 - j 2493

z = 0.2613 - j2492
g = -6
 
> Rs: 29 milli-ohm

Rs = 0.0289 Ohms


O.K. Lots of numbers...

54°16'N / 10°04'E, JO54ag
73 es gl de Peter, DF3LP