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30-40 Meter Vertical
I built this antenna specially to be used on the 30 meter band. The coil used is big enough to cover the 40 meter band as well. The coil is a bit over kill to just run 200 watts through it, but it was given to me. This coil came from a broadcast transmitter
post 29 Jan 2024
30 meter antenna Links →
A 20- & 30- or 20- & 39-Meter Trap Antenna
Thatit would be fun and doable to design a 20 & 30 or 20 &39meter vertical antenna, featuringa coaxial trap to isolate the20-meter portion
Antenna verticale per 30/40 metri
L'antenna ha una risonanza a circa 10500 MHz, quindi un po' piu in alto rispetto alla nostra fettina dei 30 metri
Antenna Bobtail-Curtain 30 Meters
It is made up of three vertical elements of 1/4 wave aligned in the same plane; each vertical element is spaced a length equal to ½ wave from the following vertical element
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Thatit would be fun and doable to design a 20 & 30 or 20 &39meter vertical antenna, featuringa coaxial trap to isolate the20-meter portion
L'antenna ha una risonanza a circa 10500 MHz, quindi un po' piu in alto rispetto alla nostra fettina dei 30 metri
It is made up of three vertical elements of 1/4 wave aligned in the same plane; each vertical element is spaced a length equal to ½ wave from the following vertical element
Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane
Build a Three-Way Antenna Switch and Displa To use a wireless relay to select one of two high current capacity power relays
Calculo da Antena Bazooka A double bazooka antenna is a combination that has a complete coaxial wave multiplied by its velocity factor and a total end-to-end length of 1/4 wave for each side affected by another driver shortening factor