✔ Antenna Trap Capacitor

Antenna Trap Capacitor

- April 02, 2018

Coaxial cable antenna traps these traps are neat compact cheap and easy to assemble. The trap can consist of a coil and a separate hv capacitor.

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Antenna traps need an inductor and a capacitor in a parallel circuit to effectively cut off the end of the antenna for some higher frequency giving dual band capability.

Antenna trap capacitor. The capacitor is made by inserting one aluminum tube inside another with an insulating sleeve in between serving as the dielectric. If trap impedance is too low the 14 wave section is detuned trap loss increases and the supposed isolated length of antenna wire begins to radiate. For the 15 and 10 meter bands when the tubes over lap about 5 inches.

A trap is a parallel circuit of l and c on the frequency you want to close an antenna segment. The resultant parallel resonant lc circuit exhibits a high impedance at the resonant frequency of the trap and effectively disconnects everything after the trap from the previous section. This type of trap construction of fers several electrical advantages arid is.

W3jlp 0th the coil and capacitor of a parallel resonant antenna trap can be made from the same length of coaxial cable. If youre a ham thats got to sound interesting. Hf antenna traps kit pair 1423 inc.

Next pair i will substitute one capacitor only for 40m. Make your single band antenna into a multibander with our lightweight antenna traps. The approach being taken here to manufacture an antenna trap is to use electrical conduit as the dielectric between two aluminium tube cylinders and create a physical capacitor that way.

For example a 2 band dipole needs one trap in each half of the antenna. Program operating notes whenever the trap resonant frequency is changed via the keyboard the test frequency is automatically set equal to it. The capacitance should be around 25 pf.

For n working frequencies of an antenna you need n 1 traps in each part of the antenna. Separated by the coaxial cable di electric serve as the trap capacitor. The resulting capacitor is then mounted centrally inside the coil former tube to make a physically neat while strong arrangement.

Only issue was having to solder two capacitors in parallel with only one pair of holes.