Antenna at 144 ... 146 MHz. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / VHF antennas
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This antenna is made on the basis of information materials received from Polish radio amateurs. The antenna is a system of phased radiators.
The antenna vibrator is shown in Fig.1.
Ris.1
When repeating the antenna, pay attention to the fact that the extension coils are wound in different directions. A drawing of extension coil frames is shown in Fig. 2.
Ris.2
The base of the antenna is a duralumin or metal plate bent at an angle of 90 degrees. Counterweights are attached to it, as shown in Fig. 3. A lower extension coil and a coaxial cable connector are attached to the horizontal platform, the vertical platform is used for attaching to the antenna mast. Subject to the dimensions, the SWR of the antenna does not exceed 1,5.
Ris.3
For a more thorough adjustment, you can provide for changing the length of the upper pin. The SWR of a carefully tuned antenna is close to 1. The antenna is not critical to the installation site, and when making local communications it is not inferior to directional antennas.
Author: S. Ilyashenko (EW3CS), Brest; Publication: N. Bolshakov, rf.atnn.ru
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