Converter 2500-2700 MHz to 470-670 MHz with balanced input. Scheme, description

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Converter 2500-2700 MHz to 470-670 MHz with balanced input. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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This converter is designed to receive MMDS TV on a simple rhombic antenna. The symmetry of the entrance is provided by two lines. The first is formed by two pieces of a copper tube 3 mm in diameter (capillary), with a gap of 3 mm between them, closed at the end (soldered into the side wall of the box). The second line is coaxially located inside one of the capillaries and is made of copper wire 1,2 mm in diameter and insulated with a fluoroplastic tape wound around it. Through a hole in the capillary, it is connected to the second capillary with a clamp.

After coordination, by moving the clamp, it is fixed on the capillary by soldering. These lines together transform the high resistance of the rhombic antenna into units of ohms of the input resistance of the transistor VT1. Capacitors C7 and C14 are constructive. C7 is made of 1,5 mm double-sided fiberglass 3x5 mm in size and soldered between the VT2 base and the board. C17 flag made of tin, 3x3 mm before the bend and 2x7 mm for soldering, is located near the emitter terminal of the resistance R9. By adjusting the connection of the flag C14 and the trimmer R5, the optimal mode of the mixer VT4 is set. The frequency of the local oscillator VT3 is set by bending the line L6 to the "ground". The KT3109A transistor in the local oscillator is not a mistake, as it turned out, it easily generates at frequencies up to 2500 MHz! All parts connected behind the feedthrough capacitors are located in the basement on the other side of the board. Cm. "Refining feedthrough capacitors". The supply voltage +12 V is supplied via a signal cable through an LC filter similar to the L9C21 converter. 73! UO5OHX ex RO5OWG 1999. See rhombic antenna dimensions. here.

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Author: E.Shustikov, UO5OHX ex RO5OWG; Publication: shustikov.by.ru

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