Double balanced modulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Double balanced modulator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Modulators

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In the note by I. Shuliko (RJ8JCW) and A. Goncharov (UJ8JKD) "Double balanced mixer", published in the journal "Radio" (1984, No. 10, p. 21), a simple assembly on the K174XA2 chip is described. An even simpler device of a similar purpose without inductors is obtained using the K174UR1 microcircuit (see diagram).

With an input signal with a frequency of 1000 kHz and a level of 30 mV, a single-sideband signal with a voltage of about 71 V is present at the output of electromechanical filter 2. The carrier frequency is suppressed by at least 50 dB.

Double balanced modulator

When establishing a node, the modulator is balanced with a tuning resistor R1. The required level of the SSB signal at the output of the node is set by a variable resistor R6.

Authors: A.Kartavtsev (U3QCX), Yu.Enin (UV3QG), Voronezh; Publication: N. Bolshakov, rf.atnn.ru

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