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Helical Coil calculator
The inductance and self capacitance of a helical coil can be determined by entering its dimensions in the boxes above. The length of wire used is also calculated
post 30 May 2026
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Verticale 10 MHz homr brew
Antenna verticale 30M 10MHz home made
Why I Don't Like Trap Antennas
So let me tell you why I choose or design antennas the way I do
Wire trap for 12m WARC band
Wire traps are cheap, easy to assemble in a reproducible manner, but can be mechanically fragile easily deformed , good for permanent operation, on dipoles, inverted-V's etc
Inverted-V Antenna for 3.5, 7, 14, 21 & 28 MHz
Trap-style Inverted-V Antenna for 3.5, 7, 14, 21 & 28 MHz i.e. 10 to 80 metres
20m L/C trap on Fritzel isolator
Calculated resonance 21.995 MHz but in practice it’s around 21.600 MHz
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Antenna verticale 30M 10MHz home made
So let me tell you why I choose or design antennas the way I do
Wire traps are cheap, easy to assemble in a reproducible manner, but can be mechanically fragile easily deformed , good for permanent operation, on dipoles, inverted-V's etc
Trap-style Inverted-V Antenna for 3.5, 7, 14, 21 & 28 MHz i.e. 10 to 80 metres
Calculated resonance 21.995 MHz but in practice it’s around 21.600 MHz
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