SU117323A1 - Quartz Calibrator - Google Patents

Description

Quartz calibrators (generators) are known for obtaining a discrete frequency spectrum in various radio engineering devices. However, they have the following disadvantages: they create a narrow frequency spectrum, since the intensity of the harmonics decreases sharply with growth; the interval between the frequencies of the spectrum is equal to the natural frequency of quartz and is limited in the direction of decreasing, due to the complexity of the technology of making quartz.

In the proposed quartz calibrator these drawbacks are eliminated.

A distinctive feature of it is that, in order to divide the frequency of quartz by a larger number of times, a short pulse generator and a quartz filter tuned to the frequency /, the voltage of which is fed back to the crystal oscillator, is used to isolate the difference frequency used to excite

pulse generator.

In its structure, the quartz calibrator is simple, economical and stable in operation.

The drawing shows a block diagram of a calibrator.

It consists of a quartz oscillator and a frequency converter 1,

separating frequency; filter 2; pulse generator 3; and quartz filter 4, tuned to frequency / sq. j

As can be seen from the diagram, a short pulse generator is covered by a feedback circuit with selectivity at high order harmonics.

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7 square

The proposed device is not only a divider, but also a frequency multiplier, where, in order to increase the order of subharmonics and obtain a discrete spectrum, a short pulse generator is used. :.

Subject invention

A quartz calibrator, characterized in that, in order to divide the frequency of quartz by a larger number of times, an oscillator is used shortly,. in-l

pulses and a quartz filter tuned to a frequency / sq -,

the voltage of which is applied back to the crystal oscillator for high voltage,

dividing the difference frequency used to drive the pulse generator.

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