Amateur radio is very popular among the wire antenna w3dzz, description and operation of this wire antenna often occurs in amateur literature . This popular wire antenna w3dzz is that with small linear dimensions , it can work in several amateur bands . The figure shows a further embodiment of the antenna w3dzz. This version of the wire antenna is designed to work in the amateur bands 1.9 , 3.6, 7, 28 MHz . Total length of the antenna about 67 meters. To connect to the transmitter output w3dzz can use a coaxial cable with a characteristic impedance of 50 or 75 ohms. Coils are wound on a frame 25mm in diameter of a copper conductor with a dielectric diameter of 1 mm, number of revolutions 38. Capacity (c1 and c2) capacitors antenna is 470 pF (four series-connected capacitor with a total capacity of 470 pF ) , the voltage at which shall be calculated these capacitors should be at least 500 volts. These capacitors are located inside the mandrels and are filled with sealant. Frequency tuning L1C1 and L2C2 is 3580 kHz . VSWR w3dzz at frequencies from 1840 to 3580 not more than 1.5, 7.1 and 7 ... 28.2 ... 28.7 - 2.
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