Balance mixer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Balance mixer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Mixers, frequency converters

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The node, the scheme of which is shown in the figure, can work as a balanced mixer when receiving and as a balanced modulator when transmitting. When receiving an RF signal from a bandpass filter formed by elements L1, L2, C1-C3, through the coupling coil L3, it enters in antiphase to the gates of transistors V1, V2, and the local oscillator voltage goes to the sources of transistors through capacitors C6-C8.

In this case, an IF signal (500 kHz) is allocated at the output of the node.

When working on transmission, a low-frequency signal from transformer T1 is supplied in antiphase to the gates of transistors V1 and V2, and a local oscillator signal with a frequency of 500 kHz is fed to their sources. At the mixer output, a DSB signal appears.

Capacitors C4, C5 and chokes L4, L5 separate high-frequency and low-frequency circuits.

(click to enlarge)

Inductors L4 and L5 are wound on MLT-0,5 resistors with a resistance of at least 1 MΩ with a PEL 0.07 wire (200 turns). Transformer T1 - transitional from any pocket receiver, T2 is wound on an annular (outer diameter 7 ... 12 mm) ferrite magnetic circuit with a permeability of 400 ... 1000. Each winding contains 34 turns of PEL 0,09 wire. The winding is carried out immediately with three wires twisted into a bundle.

This mixer can be used in the "Radio-76" transceiver instead of the ring diode one. In this case, the L3 coil should contain 20 turns of PEL 0.14 wire. It is wound over the L2 coil.

Establishing a node comes down to balancing it when working on transmission with resistor R2. At the same time, maximum suppression of the carrier frequency is achieved.

Author: L. Kudatsky (UB5UKF), pos. Klavdeevo, Kyiv region; Publication: N. Bolshakov, rf.atnn.ru

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