#LaboratoryW #UR3QQJ #Helix #433MHz
Спиральная антенна на 433MHz. Часть I (конструктив)
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По вопросу приобретения спиральных антенн → kitsyagi собачка жемыло ком
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В наличии и под заказ:
1. Готовые антенны Cross-YAGI 2el в двух модификациях и наборы для самостоятельной сборки для экоономии вашего времени.
2. Готовые спиральные антенны Helix 3t, 5t, 6t в двух модификациях (c полосой 100 MHz).
3. Готовые спиральные антенны Helix 7t on 433MHz (полоса 150 MHz, перекрывает и спутники Meridian).
4. Сумматоры Wilkinson с фазирующей линией для антенн типа Cross-YAGI.
5. Программно-аппаратные моды ваших Zastone M7, QYT/TYT KT-7900D и восстановление мощности.
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• Part III [ Ссылка ].
• Part II [ Ссылка ].
• Part I [ Ссылка ].
• Coordination of the high-resistance of the coil with the 50-Ohm path is realized by pressing the last coil of the coil against the reflector, the behavior of which was studied in the work of Slobodan V. Savić, Member, IEEE, Milan M. Ilić, Senior Member, IEEE, and Antonije R. Djordjević "Influence of Wire-Based Impedance-Matching on Helical Antenna Radiation and Limitations of Equivalent Model".
• To eliminate the influence of hands when adjusting the impedance of the spiral to the impedance of the feeder, the matching unit is made of a bolt located on the reflector at a distance of 15 mm from the central pin of the N-type female block type, and a clamp on it made of tin from under a can of coffee, through which the wire is passed spirals (cable). By gradually turning the bolt, the high-resistance impedance of the coil is reduced.
• The HELIX characteristics were measured on an FA-VA5 vector antenna analyzer at a central frequency of 432.500 MHz in a band of ± 10, ± 50, ± 100 MHz. The working band of the antenna over 150 MHz at the VSWR level of less than 1:1.5 has been practically achieved.
• The soldering point of the spiral and the N-type central pin, including the dielectric sleeve, is covered with several layers of Plastik 70 clear acrylic lacquer.
• A metal tray 460 mm in diameter was used as a reflector. Its choice is due to its low weight, the presence of a ready-made stiffener along the contour and stainless steel material.
• The reflector is mounted on the boom using 4 perforated corners made of galvanized steel 2.5 mm thick and 8 bolted joints. The longer the shoulder length of the corners, the better.
• The corners were fixed on the boom with two stainless steel clamps 32-50 mm.
• Antenna orientation with fixation in azimuth and elevation is carried out by a combination of a U-bolt fastener with a plate from the nearest auto store (I am looking for stepped ribs) and a plate (temporarily made of alumoplast) with 9 fixing holes every 10° and two holes for U- bolt.
• Antenna weight with reflector and fasteners 2.54 kg.

The full design of a helical antenna see [ Ссылка ] and calculations is described in detail [ Ссылка ]

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