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Multi-band Windom powered by coaxial cable. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / HF antennas

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I7SWX uses multi-band "Windom" 3,5...28 MHz Fig.1. It has an input impedance of 300 ohms and is matched to a 75 ohm coaxial cable using a 4:1 broadband transformer. The design of the transformer is shown in Fig. 2, 3. The antenna is used at a power of 200 W SWR no more than 2.

Multiband Windom powered by coaxial cable
Ris.1

Multiband Windom powered by coaxial cable
Ris.2

Multiband Windom powered by coaxial cable
Ris.3

Author: Gian MODA (I7SWX). Translation from English. A. Gaisin (UZ1ZWD); Publication: N. Bolshakov, rf.atnn.ru

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Fujifilm Fujinon XF16-80mmF4 R OIS WR Lens 22.07.2019

Fujifilm has announced the Fujinon XF16-80mmF4 R OIS WR lens, which will be available in September for an estimated price of $800.

The novelty is designed for Fujifilm X Series mirrorless cameras. It is noted that the solution is suitable for various shooting scenarios, including fast photography, landscape photography, as well as for working in low light conditions.

The lens offers 88,9x optical zoom. At the same time, the device is enclosed in a compact case with a length of XNUMX mm. A highly efficient optical image stabilization system has been implemented.

The novelty has received an all-weather performance: it is not afraid of moisture and dust. Guaranteed to maintain performance when operating at temperatures down to minus 10 degrees Celsius.

Key Features:

Type: Fujifilm X;
Construction: 16 elements in 12 groups, including three aspherical lenses;
Focal length: 16-80mm (24-122mm equivalent for 35mm film cameras);
Number of aperture blades: 9;
Minimum focusing distance: 0,35 m;
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