Reference generator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Reference generator. 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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To form an SSB signal, sometimes electromechanical filters are used, the frequencies of which differ from the frequencies of standard low-frequency quartz resonators by several kilohertz. Electronic tuning of quartz resonators; at low frequencies within these limits is impossible. Such a problem can be solved by isolating the beats between the oscillations of two generators stabilized by high-frequency quartz resonators.

Crystal oscillators (see figure) are assembled on transistors T1 and T3. Capacitors C1 and C8 are selected to adjust the frequency of the generators. Their capacitance can range from tens to thousands of picofarads. Such generators work well in the range of 1-10 MHz, requiring almost no tuning.

(click to enlarge)

In many cases, the chokes Dr1 and Dr3 can be replaced by resistors with a resistance of 2-6 kOhm. To obtain a frequency of 501,7 kHz, quartz resonators Kv1 7,0 and Kv2 7,5 MHz were used. Frequency stability depends mainly on the stability of the supply voltage. When the supply voltage changed by ±1 V, the frequency changed by ±40 Hz (the control was carried out by an electronic frequency meter Ch3-12). The mixer is made on the transistor T2. Capacitor C5 is selected according to the minimum non-linear distortion, controlling the output voltage with an oscilloscope. Coils L1 and L2 are wound on the SB-12a core and have 100 and 20 turns of PEL 0,1 wire, respectively.

Additionally, such a generator allows you to get any harmonics of quartz resonators to transfer the SSB signal to the operating range, for example, 22,5 MHz (using a frequency multiplier assembled on a T4 transistor). For a frequency of 22,5 MHz, the L3 coil has 6 turns of PEL wire 0,8, the frame diameter is 8 mm. The contour is rebuilt by the SCR-6 core.

When setting, adjust the resistance of the resistor R12, achieving the maximum reading of the voltmeter connected to the output. A similar oscillator was built with a frequency signal of 277 kHz. It showed similar results.

Author: V. Egorenkov (RA3DAV), Kaliningrad, Moscow Region; Publication: N. Bolshakov, rf.atnn.ru

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