SU544097A1 - Device for automatic frequency control - Google Patents

Description

one

The invention relates to radio engineering and can be used in receiving and transmitting equipment of pulsed radar stations.

One of the known devices for frequency auto-tuning includes a ring-coupled oscillatory L C circuit with an electronic control element, a converter that extracts the envelope signal, a misalignment sensor, an actuator element consisting of a key code-analog converter with a counter, and a modulating signal generator, connected in series with the power circuit of the actuator ij.

However, the known device does not provide stability oscillations in the range of ultra-high frequencies.

The closest technical solution is a device for automatic frequency control, containing a series-connected pulse distributor, a stepper motor, a hetero cell, with a Lester, the second input of which is connected to a reference generator of radio pulses, an intermediate frequency amplifier and a driver 2u pulse generator.

However, the known device has a low reliability.

The purpose of the invention is to increase the reliability of the device in operation.

To do this, in the device for automatic frequency control, containing a series-connected pulse distributor, a stepper motor, a local oscillator, a mixer whose second input is connected to a reference generator of radio pulses, an intermediate frequency amplifier and a driver of control pulses, the elements of the driver pulse generator and the inputs of the pulse distributor matches, the second input of which is combined and connected to the output of the inputted one vibration device, which triggers the input of inputted OR element connected to the output of the control pulses constituents.

The drawing shows a structural electrical circuit of the proposed device.

The device contains a pulse distributor 1, a stepper motor 2, a local oscillator 3, a mixer 4, the second input of which is connected to a reference generator of radio pulses 5, an intermediate frequency amplifier 6, a frequency discriminator 7 and a control pulse shaper 8. Between the outputs of the imaging unit 8 and the inputs of the distributor 1, elements 9 and 10 are included, the second inputs of which are combined and connected to the output of the input one-shot 11, the triggering input of which through the input element OR 12 is connected to the output of the imaging unit 8.

The proposed device operates as follows.

If the frequency difference between the generator 5 and the local oscillator 3 with the intermediate frequency exactly coincides, the pulses at the output of the discriminator 7 are very small or absent. When the oscillator or heterodyne frequency changes by an amount exceeding a certain value, impulses of a certain polarity arrive at the input of the imaging unit 8. With positive polarity, they pass to the right output of the imaging device 8, and with a negative polarity - to the left. Through the OR 12 circuit, the pulses are fed to the input of a one-shot 11 operating in the division mode, so that a pulse sequence with a lower tracking frequency that goes to the inputs of the matching elements 9 and 10 appears at its output. The two pulses of the two elements of the matching element 10 act at the same time, from its output they pass to the corresponding input of the distributor 1, from the output of which a certain sequence of pulses arrives at the schagovy electric motor 2, and it takes steps by rearranging the heterodyne frequency 3 and in the direction of reducing or increasing the difference in deflection generator and the local oscillator frequency from an intermediate frequency.

Claims (2)

Invention Formula A device for automatic frequency control, containing a series-connected pulse distributor, a stepper motor, a local oscillator, a mixer, the second input of which is connected to a reference generator of radio pulses, an intermediate frequency amplifier, and a driver for controlling pulses, in order to increase the reliability of the device, between the driver outputs control pulses and pulse distributor inputs are included matching elements, the second inputs of which are combined and connected to the output of the input Nogo odnoaibratora, trigger input of which is inputted through an OR gate connected to outputs of the control pulses for.mirovatel constituents. Sources of information taken into account in the examination: 1, Copyright certificate № 2913О1, M. N 03 B 3/00, 1970 (equivalent). 2. Certificate of Authority No. 469203, M. Cl. H 03 W 3/04, 1974 (prototype).