What is the screwdriver antenna?

The screwdriver antenna is a distant antenna with variable fine -tuning preferred to the operator and enthusiasts of the radio and ham. Characterized by an excessive cylindrical cover at its lower end and a whip antenna at its upper end, it is usually fastened to heavy holders on a vehicle or base. This antenna comes in principle that the engine from the electric screwdriver could be used to control the mobile antenna for remote tuning. The antenna developed Donald K. Johnson in 1991 and has a large cylindrical basis designed to increase the surface area and significantly improve radiation in compact size. This antenna, which is able to automatically shorten or extend for a wider tuning range, can be modified by a remote switch or digital control.

traditionally antennas tuned by the remote relation to variable capacitors or inducers tuned by electric motors. On the other hand, the screwdriver antenna is usually a vertical whip suspended in a tube, which contains a screwdriver engine. Its tuning coil is adjustedThrough motor, usually remote switches or pads with different complexity. In principle, these switches switch power to the antenna and control the mechanism up or down, extending and pulling its length with high variability and range of bandwidth. This change in height regulates the wavelength of the antenna is able to transmit and receive.

The screwdriver antenna has certain unique properties that distinguish it from the antennas for the garden varieties. It can ensure continuous coverage of frequency ranges while running on a powerful engine with hard torque evaluation, which are designed to handle. The engine conversion may include additions such as output shafts for the stability of the antenna or including filter capacitors to reduce engine noise when tuning.

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screwdriver engines allow quick adjustments along the entire length of the antenna. These types of engines are also Easily replaced if problems occur.Many enthusiasts prefer the position of their own screwdriver antennas. They can build antennas on their preferred frequencies and lengths. The length of the antenna is directly proportional or a multiple of wavelengths of size that it can pick up, which provides a great variety of designs and performances.

Common accessories of the screwdriver antenna include remote controls or switches. The more complex of these devices offer digital displays and accurate tuning, memory, antenna position values, programmable location and sometimes dynamic braking; This can provide more accurate stop points to face any delayed engine reactions to tune. The controllers can be designed to work with any number of screwdriver antenna patterns. Other accessories may include mounting brackets, weather covers and various handles.

In short, the screwdriver antennas provide comfort for versatile performance. Their design allows high radiation efficiency in a tight package. These antennas give users a strong capableOst transfer difficult for some radio enthusiasts to withstand.