RadioBanter - View Single Post - Current in antenna loading coils controversy

November 12th 03, 08:44 PM

On 12 Nov 2003 10:03:40 -0800, (Mark Keith) wrote:

OK. Lets say the coil in the real world is one foot long. That is appx
1/10 of the total antenna length. Will there be any argument that max
current will occur at the coil? I hope not...

Hi Mark,

I offered an EZNEC analysis that supported (circumspectly) Yuri's
position, but he blew it off chasing rainbows. Using the protocol
(already published by Yuri) for emulating a solenoid (and not just the
contentious one point load), that solenoid is found residing on
segments 50 to 59 (spanning 10 inches):
1 W2E1 1 0.00
2 .95623 0.00
3 .9205 0.00
4 .88976 0.00
5 .86122 0.00
6 .83415 0.00
7 .80815 0.00
8 .78296 0.00
9 .75843 0.00
10 .73443 0.00
11 .71088 0.00
12 .68771 0.00
13 .66486 -0.01
14 .64229 -0.01
15 .61997 -0.01
16 .59787 -0.01
17 .57596 -0.01
18 .55421 -0.01
19 .53261 -0.02
20 .51115 -0.02
21 .48979 -0.02
22 .46853 -0.02
23 .44736 -0.02
24 .42627 -0.02
25 .40523 -0.02
26 .38424 -0.02
27 .36329 -0.02
28 .34238 -0.03
29 .32148 -0.03
30 .30059 -0.03
31 .27969 -0.03
32 .25878 -0.03
33 .23785 -0.03
34 .21688 -0.04
35 .19585 -0.04
36 .17477 -0.04
37 .1536 -0.05
38 .13234 -0.05
39 .11095 -0.06
40 .08941 -0.07
41 .06769 -0.08
42 .04576 -0.12
43 .02355 -0.21
44 .001 -4.38
45 .02202 -179.8
46 .04579 180.00
47 .0707 180.00
48 .09404 180.00
49 .11529 180.00
50 .13404 180.00
51 .14984 180.00
52 .16235 180.00
53 .17155 180.00
54 .17718 180.00
55 .17057 180.00
56 .15943 180.00
57 .15069 180.00
58 .1433 180.00
59 .13668 180.00
60 .1306 180.00
61 .12495 180.00
62 .11962 180.00
63 .11457 180.00
64 .10975 180.00
65 .10512 180.00
66 .10066 180.00
67 .09634 180.00
68 .09216 180.00
69 .08809 180.00
70 .08413 180.00
71 .08025 180.00
72 .07646 180.00
73 .07274 180.00
74 .06908 180.00
75 .06549 180.00
76 .06194 180.00
77 .05845 180.00
78 .05499 180.00
79 .05158 180.00
80 .04819 180.00
81 .04484 180.00
82 .0415 180.00
83 .03819 180.00
84 .03488 180.00
85 .03159 180.00
86 .02829 180.00
87 .02499 180.00
88 .02167 180.00
89 .01831 180.00
90 .01491 180.00
91 .01141 180.00
92 .00777 180.00
93 Open .00363 180.00

I will note a caveat that it does not prove anything by Yuri's source
of information, and as Yuri is admittedly ignorant of the details of
the physical model, I was forced to guess the model specification by
the inference of the commentary at his page, and the attending
photographs. Further, contrary to what was said, neither is it
resonant (a fact that Yuri offers no amplification too, amending data,
or confirmation nor denial), About the only thing that can be said:
"the solenoid offers a current differential."

73's
Richard Clark, KB7QHC