Two-transistor quartz oscillator. 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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The generator (see figure) can be useful when setting up various AM and FM amateur receivers. It consists of quartz and low-frequency oscillators, made respectively on transistors T2 and T1.
The low frequency signal through the transformer Tr1 affects the high frequency signal. When using quartz at a frequency of 8 MHz, the modulated signal is well audible at the eighteenth harmonic (144 MHz). The type of modulation in this case is mixed - AM and FM.
The signal frequency of the modulating oscillator is about 1 kHz. The resistance of the primary winding of the transformer is 300-500 ohms, and the secondary - 2,5-8 ohms. Inductor Dr1 is wound on a resistor with a resistance of 100 ohms.
The OS44 transistor can be replaced with P422. and AC132 - on MP41A. Inductor Dr1 should have an inductance of the order of 100-500 μH. As transformer Tr1, you can use the output transformer from pocket transistor radios.
Literature
- Radio REF (France), 1974, No. 4
- Radio No. 6, 1975, p.60
Publication: N. Bolshakov, rf.atnn.ru
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