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Re: LF: LF-antenna with top load

To: [email protected]
Subject: Re: LF: LF-antenna with top load
From: "Peter W. Schnoor" <[email protected]>
Date: Thu, 16 Sep 1999 19:12:45 +0200
Organization: University of Kiel, Clinic of Nephrology
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
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


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