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Calculated values for
different installation cases |
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Example |
Feedpoint |
Apex |
Element |
Element |
Radiator |
C1 |
L1 |
C2 |
Tested |
Comment |
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height |
angle |
material |
length |
resonance |
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See Note3 |
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1 |
29m |
100deg |
2.0mm cu |
2x21.00m |
3525kHz |
134pF |
17.3uH |
488pF |
yes |
inverted V, OH1TV built |
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2 |
23m |
100deg |
1.6mm al |
2x20.87m |
3540kHz |
120pF |
18.7uH |
488pF |
not yet |
inverted V |
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3 |
40m |
180deg |
1.6mm al |
2x20.90m |
3540kHz |
120pF |
19.0uH |
460pF |
not yet |
straight wire dipole |
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4 |
40m |
180deg |
2.0mm cu |
2x20.90m |
3540kHz |
150pF |
15.8uH |
470pF |
not yet |
straight wire dipole |
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5 |
28m |
180deg |
2.0mm cu |
2x20.80m |
3545kHz |
150pF |
15.85uH |
440pF |
not yet |
straight wire dipole |
see SWR below |
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6 |
22m |
180deg |
2.0mm cu |
2x20.60m |
3515kHz |
150pF |
15.9uH |
440pF |
not yet |
straight wire dipole |
see SWR below |
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7 |
18m |
180deg |
2.0mm cu |
2x20.50m |
3533kHz |
150pF |
15.8uH |
460pF |
not yet |
straight wire dipole |
see SWR below |
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8 |
12m |
180deg |
2.0mm cu |
2x20.47m |
3520kHz |
150pF |
15.6uH |
500pF |
not yet |
straight wire dipole |
see SWR below |
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9 |
20m |
hor loop |
2.0mm cu |
4x21.75m |
3650kHz |
150pF |
17.1uH |
290pF |
not yet |
horizontal loop, feed in corner |
see SWR below |
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10 |
15m |
hor loop |
2.0mm cu |
4x21.60m |
3605kHz |
150pF |
16.9uH |
320pF |
not yet |
horizontal loop, feed in corner |
see SWR below |
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Note1: If element wire ends are
turned around (an insulator) and wrapped, this adds capacitance at the
element end and lowers resonance frequency. |
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To compensate the error, both sides
of the element shall be shortened. In practice 3-6cm |
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Note2: Coax cable connection in
feedpoint is not ideal. Connecting cables introduce some inductance in series
with the antenna and lowers |
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resonance frequency. Also this can
be compensated by shortening the radiating wire. In practice 2-5cm shortening
helps. |
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Note3. Resonance measured at the 1m
cable end |
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SWR in example 5, up 28m |
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SWR in example 6, up 22m |
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SWR in example 7, up 18m |
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SWR in example 8, up 12m |
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Example 9, horizontal
loop up 20m |
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Example 10, horizontal
loop up 15m |
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Back |
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18.10.2010 |
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OH1TV |
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