Quartz generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Generators, heterodynes
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In the process of designing amateur radio equipment, there is often a need for a crystal oscillator for one or more frequencies. A diagram of one of these generators, for three frequencies, is shown in the figure. It is made on four elements "2I-NOT". When generating a signal, only two logic elements work in it at the same time: D1.4 (permanently) and D1.1 (or D1.2 and D1.3, depending on the position of switch S1). Resistors R1-R4 provide a linear mode of amplification of the "2I-NOT" elements. At the output of element D1.4 - rectangular pulses, the amplitude of which is about 3 V.
To obtain a sinusoidal voltage, tori C4 - C6 serve to adjust the generation frequency, and resistors R5 - R7 - to set and equalize the input voltage amplitudes.
The authors used this generator in SSB to CW signal generators when creating a transceiver based on the R-250M2 radio receiver. It can be used at other frequencies, using quartz with a resonant frequency of 75 ... 3000 kHz. Moreover, quartz may have a low quality factor.
When mounting the generator, resistors R1-R3 should be placed as close as possible to the corresponding pins of the microcircuit.
Authors: G. Gulyaev (UA4HLK ex UY5XS), G. Chliyants (UY5XE), Kuibyshev - Lvov; Publication: N. Bolshakov, rf.atnn.ru
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