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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 09 Dec 2024
Coils Traps Antennas Links →
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
100
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
Microsat Ham radio shop for ulari project, aprs, aprs with radio, bluetooth, gps, gsm, ham radio interfaces, weather,accessories, cables to radio
Amateur radio kits by Kanga US
Enigma Component Shop Cable & wire,capacitors, connectors, crystals/oscillators, filters, hardware,kits/modules,test & measurement