Simple antenna. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / VHF antennas
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In some cases, when for some reason it is impossible to build a complex "wave channel" antenna that gives the best results in the 144 MHz band, you can use a whip antenna, which is simple in design and does not require a rotary mechanism, since its radiation is not directed .
The design of the antenna is shown schematically in fig. 1. An emitter 1 525 mm long made of a copper or brass tube with an outer diameter of 8 mm is passed through a bushing insulator 2 and connected to the inner contact of the chip 3 of the coaxial connector. The outer contact of this chip is connected to a rectangular base measuring 120x90 mm made of sheet steel or aluminum. Beams 5 490 mm long made of steel or aluminum bars 6 mm in diameter are welded to the four corners of the base.
Ris.1
With the exact observance of the above dimensions (the length of the emitter is considered from the junction with the coaxial connector chip), the output impedance of the antenna will be 60 Ohm.
You can install the antenna in the attic between the rafters or on the mast. In all cases, it should be placed as far as possible from the metal parts of the house, so as not to increase losses.
Literature
- Radio No. 1 1964, c.60
Publication: N. Bolshakov, rf.atnn.ru
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