Broadband vertical radiator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Broadband vertical radiator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / VHF antennas

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Georgy Alekseevich Rumyantsev (UA1DZ) developed and successfully operated an antenna consisting of eight phased broadband vertical radiators.

Such radiators can be used both by themselves and as elements of complex antennas.

The broadband vertical emitter UA1DZ gives a maximum radiation at a small angle to the horizon; when making long-range communications, it turns out to be equivalent to a three-element "wave channel". Power is supplied to the emitter via a coaxial cable with a characteristic impedance of 100 ohms. The SWR in the cable does not exceed 1,2 in the frequency band from 10 to 30 MHz.

Broadband vertical radiator

The design of the UA1DZ emitter is shown in the figure. The antenna sheet is made of a wire with a diameter of 2...3 mm. Insulating elements are shown in red. 6 m of coaxial cable is wound on the lower insulator.

The bearing mast can be made of pipes with a diameter of 40...50 mm, spacers - of pipes with a diameter of 10...20 mm. At the top and bottom, the wires that form the emitter are isolated from the mast and connected to each other, in the center they are connected to the mast. The upper vibrator is connected to the central conductor of the cable, the lower vibrator is connected to the braid.

Author: S. Spokoinova (UW1DC, XYL UA1DZ); Publication: cxem.net

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