SU932632A1 - Device for testing serviceability of superheterodyne receiver - Google Patents

Description

(54) DEVICE. FOR THE CONTROL OF OPERATION CAPACITY OF A SUPERGETERODINOUS RECEIVER

I

The invention relates to radio and can be used in various systems of radio telephone and radiotelegraph communication to control the high frequency path of radio receivers in standby mode.

A device for monitoring a superheterodyne receiver is known, comprising an input signal simulator, a pilot signal generator, a delay element, a transducer 1 | p and a series-connected threshold unit and an indicator 1.

The disadvantage of this monitoring device is that it is not possible to monitor the parameters of the radio receiver while receiving the signal of the correspondent.

The purpose of the invention is to provide control without interruption of the operation of the superheterodyne receiver.

This goal is achieved by tek4 that in the device for controlling a superheterodynam receiver, containing an input signal simulator, a control signal generator, the element

delays, a filter and a serially connected threshold unit and an indicator; a balanced demodulator is introduced, the first output of the input signal simulator, the second output of which is connected to the superheterodyne receiver, through a serially connected balanced demodulator, the second input of which is connected to the output of the second intermediate frequency amplifier superheterodyne receiver, and the filter is connected to the threshold input

10 block, the output of the control signal generator, made in the form of a pseudo-random sequence generator, is connected to the first input of the input signal simulator and to the input of the delay element whose output is 5 5 dinene to the second filter input, and the input signal simulator, the second and third inputs are connected with the outputs, respectively, of the first and second heterodyne of the superheterodyne receiver, made in the form of successively connected intermediate frequency generator, balanced modulator and the first and second mixes spruce, and the outputs of the intermediate frequency generator and the second

The mixer and the second inputs of the balanced modulator and the second and first mixers are respectively the first and second outputs and the first, second and third inputs of the input simulator.

The drawing shows a structured electrical circuit of a device for monitoring the performance of a superheterodyne receiver with a superheterodyne receiver.

The device contains an input signal simulator 1, consisting of series-connected intermediate frequency generator 2, a balanced modulator 3, a first mixer 4 and a second mixer 5, in addition, the device contains a control signal generator 6, a delay element 7, a balanced demodulator 8, a filter 9, the threshold unit 10 and the indicator 11. The control device is connected to the superheterodyne receiver 12, which contains a high-frequency amplifier 13, two mixers 14 and 15, two intermediate-frequency amplifiers 16 and 17, a detector 18 and two heights 19 and 20. The apparatus operates as follows.

The control signal, which is a sinusoidal carrier modulated by a pseudo-random sequence, is fed from the output of a balanced modulator 3 to the input of mixers 5 and 4, in which the spectrum of the controlling signal is transferred to the receiver’s tuning frequency by means of transformations. receiver 12. The control signal carrying information about the state of the high-frequency path is fed to the first input of the balanced demodulator 8, to the second input of which a non-modulator is applied Tub second intermediate frequency from the output of the balanced demodulator 8 to the input of filter 9 is supplied to the reduced-random sequence psec. On. the second input of which is supplied with an undistorted pseudo-random sequence from generator 6. The state of the receiver is received by unit 10 when comparing the response of filter 8 with a predetermined threshold. The result is displayed in indicator 11. Thus. The proposed device allows to increase the efficiency of control.

radio receiver by evaluating its parameters in standby mode, and to assess its performance there is no need to switch the radio receiver in monitor mode.

Claims (1)

Invention Formula A device for monitoring the health of a superheterodyne receiver, containing an input signal simulator, a pilot signal generator, a delay element, a filter and a series-connected threshold unit and an indicator, characterized in that, in order to provide control without interruption of the superheterodyne receiver, a balanced demodulator , while the first output of the input simulator, the second output of which is connected to the input of the superheterodyne receiver, through series-connected balanced dem a puller, the second input of which is connected to the output of the second intermediate-frequency amplifier of the superheterodyne receiver, and the filter is connected to the input of the nopoiOBoro unit; connected to the second input of the filter, and the input signal simulator, the second and third inputs of which are connected to the outputs of the first and second local oscillators, respectively, superhetero innogo receiver is configured as a series-connected intermediate frequency oscillator, a balanced modulator and the first and second mixers; moreover, the outputs of the intermediate frequency generator and the second mixer and the second inputs ba; The modulator and the second and first mixers are respectively the first and second outputs and the first, second and third inputs of the input simulator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 567209 Cl. H 04 B 1/06, 1971 (prototype).