Two circuits of simple swept frequency generators. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Two circuits of simple swept frequency generators. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Sweep generators have found wide application in tuning the frequency response of amplifiers and various filters. Below are two simple circuits that allow you to make measurements in a fairly wide range of frequencies.

The circuit shown in Fig. 1 provides for the indicated ratings the "swing" frequency from 4 to 20 MHz. The frequency range depends on the ratings C1,C3,R1,R2,R4. A double potentiometer is used as R2. A sawtooth voltage with an amplitude of 1,8V with a constant component of 0,8V is applied to the control input.

Two circuits of simple swept frequency generators
Ris.1

Figure 2 shows a circuit with a "sweep" band from 0,3 to 70 MHz. The uniformity of the frequency response of the generator itself is determined by the capacitance and inductance in the emitter circuits of the generator transistors.

Two circuits of simple swept frequency generators
Ris.2

Literature

Radio No. 2, 1978
Electronics №1, 1982

Publication: N. Bolshakov, rf.atnn.ru

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