Varactor tripler at 430 MHz. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Varactor tripler at 430 MHz. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Nodes of amateur radio equipment

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The tripler circuit is shown in fig. 1. As a varactor, a collector-base transistor T1 junction is used. The tripler input is connected to the transmitter output at 144 MHz by a short piece of coaxial cable with a characteristic impedance of 75 ohms.

For the manufacture of a tripler, sheet brass with a thickness of 1,5-2 mm is required. The chassis is made of brass with a size of 220X70 mm and details of the microwave circuits. Drawings of these parts and assembly L3. L4. С2-С5 assembled are given in fig. 2.

Varactor tripler

The LI coil consists of 4 turns of MG 1,5 wire, the winding is frameless, the winding diameter is 10 mm. length - 20 mm; L2 - from 2 turns of the same wire, frameless winding, winding diameter - 9 mm, length - 10 mm; choke Dr1 contains 10 turns of wire MG 0,5, winding diameter - 3 mm.

With strict observance of the dimensions of the parts, setting up the tripler is not difficult. An incandescent lamp 6.3Vx0.28A is connected to the tripler output connector at one end ("piglet").

Varactor tripler at 430 MHz. Design

The outlet from the output circuit is installed at a distance of a third of the line length, counting from the right (according to the diagram) end. The L1C1 circuit is tuned to resonance at the fundamental frequency of the transmitter, the L2C2 circuit - at the second harmonic, the L3C3, L4C5 circuits - at the operating frequency of the tripler.

In conclusion, the connection between the circuits and the connection with the antenna are selected according to the highest energy return.

Author: B. Karpov (RI8AAD), Tashkent; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Nodes of amateur radio equipment.

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