Generator for two frequencies. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Generator for two frequencies. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Generators, heterodynes

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In a quartz-stabilized generator, the generation frequency can be changed by simply switching the polarity of the power source. A diagram of such a device is shown in the figure.

If the connected power source has a positive pole at the top (according to the diagram), then the circuit in the collector target L1, C1, Kv1 is shunted by the diode D1 through which the collector current flows. In this case, the circuit L2, C4 and quartz Kv2 determine the frequency of the generator. The voltage of this frequency is removed from the divider formed by capacitors C2, C3.

Dual Frequency Generator

If the connected power source has the opposite polarity, the L2, C2, Kv4 circuit is shunted by the diode D2 and the generated frequency is determined by the parameters of the upper circuit. As an active element - transistor T1, a pnp type germanium transistor is used. The device used coils L1, L2 with an inductance of 5,6 mH and quartz at frequencies of 455 and 458 kHz, respectively. By changing the parameters of the resonant circuits, voltages of various other frequencies can be obtained.

Instead of the transistor 2N364, you can use KT361. Diodes D1, D2 - D9Zh.

Literature

"Old man", 1968, No. 2
Radio No. 11, 1970, p. 59.

Publication: N. Bolshakov, rf.atnn.ru

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