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Trapped Dipole Radio Antennas



A trap is a coil and capacitor in parallel having a very high impedance at its resonant frequency
post 22 Sep 2020


Coils Traps Antennas Links

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Cushcraft Trap Coaxial Capacitor Repair
There are occasions that the coaxial capacitor on Cushcraft trap R5, R7, etc. fail due to a breakdown of the insulator between the outer aluminum tubing and the inner capacitor rod

Goedkoop op 80/40 en 20/10 meter met tuner
The wire used is an enamelled copper wire with a diameter of 1.9 mm and a length of 3 meters, often used in transformers

High-Q Coil Construction Techniques
High-Q coil inductors have something in common: the length of the coil can only be slightly longer than its diameter. In other words, high-Q coils have cube-like dimensions

Helical Coil
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