SU1418920A1 - Device for checking operability of superheterodyne receiver - Google Patents

Abstract

This invention relates to a radio technique. The purpose of the invention is to improve the accuracy of control. The device contains an input signal simulator 1, keys 2, 6, 11 and 17, a correlator 5, element OR 9, a decisive block 14, is shown. controlled receiver (CP) 19. The goal is achieved by introducing into the device of the valve 3, the control unit 4, the signal level meter 7, the threshold blocks (PB) 8, 13, 15 and 16, the telegraph speed control unit 10, the telegraph speed measurement unit 12 , switching unit 18. If the distortions introduced by KP 19 exceed the norm, then at the output of PB 16 there is a signal from Avariya, which is fed to the input of the element OR 9 and signals the need to replace the gearbox or axle (reservation is required. The threshold of PB 16 is chosen equal to the sensitivity of the device technical and operational documentation. The threshold value of PB 13 is chosen equal to the maximum wiring speed at which the KP 19 is able to perform its functions. Il. (L

Description

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The invention relates to a radio communication technique and can be used to monitor the health of superheterodyne receivers during their operation.

The purpose of the invention is to improve the accuracy of control.

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

The device for monitoring the health of the superheterodyne receiver contains an input signal simulator 1, a first switch 2, a valve 3, a control unit 4, a correlator 5, a second switch 6, a signal level meter 7, the first threshold unit 8, a SHS 9 element, a speed control unit 10 wiring, third key 11, wiring speed measurement unit 12, second threshold unit 13, decision unit 14, third 15 and fourth

16threshold blocks, fourth key

17 and switching unit 18. A monitored receiver 19 is shown.

The device works as follows.

In the absence of a useful signal from the correspondent at the input of the controlled receiver 19, the output of the correlator 5 contains a signal that opens the first key 2 and switches the output of the controlled radio 19 to the input of the decision block 14, which analyzes the signal of the simulator 1 distorted by the monitored receiver. the distortions introduced by the controlled receiver 19 exceed the norm, then at the output of the fourth threshold block 16 there is a signal from Avariya, which is fed to the input of the element OR 9 and the signal It indicates the need for replacing a monitored receiver or making a backup.

If the distortions introduced by the controlled receiver 19 correspond to

Normally, at the output of the fourth threshold block 16 there is a signal that is fed to the input of the block 4 that controls the level of the signal of the simulator 1 The simulator 1 of the input signal generates signals whose level changes linearly stepwise when the signal from the fourth threshold block 16 is present, His normal work is controlled by 10

15

20

25

40 5

thirty

35

0

five

receiver 19 by the distortions measured by the decision block 14. This process occurs until the output of the fourth threshold block 16 fails to receive the Avariya signal, which opens the second key 6, and the signal of the simulator 1 is fed to the input of the signal level meter 7 imitator.

If the signal level is normal, then the output of the first threshold block 8 is the signal Norma, otherwise there is a signal from Avariya. The signal Norma is fed to the input of the fourth key 17 and opens it. The fourth threshold unit 16 has a threshold level that exceeds the threshold level of the third threshold unit 15, therefore, when Avariya’s signal is present, the output of the fourth threshold unit 16, the output of the third threshold unit 15, is the Norma signal. This signal through the open fourth key 17 is fed to the control input of the control unit 10 of the speed of wiring of the input signal simulator 1. The input signal simulator 1 generates signals whose wiring speed varies linearly in steps when there is a Norma signal from the output of the third threshold unit 15. In addition, unit 10 sets the signal rate for changing the distortion of signals inputted by the controlled receiver 19, the decisive unit 14, similar to the wiring speed of the input signal simulator 1. The decision block 14 evaluates the distortions introduced by the monitored receiver 19. When transmission of the Norway distortions exceeds, the output of the third threshold block 15 contains a signal from Avariya, which opens the third key 11 and stops changing the wiring speed using block 10.

The third key 11 is open and the signals of the simulator I are fed to the input of the wiring speed measurement unit 12, which determines the wiring speed of the simulator 1, at which the alarm condition of the monitored receiver 19 is observed. If this speed exceeds the rate set by block 10, then output is present signal norm Otherwise, on the way out

By the second threshold block 13, an Avari signal is present. The resetting of the telegraph speed control block 10 and the control block A is carried out by the correlator signal 5 when the signal of the correspondent disappears. The cycle of operation of the device for monitoring the health of the monitored receiver 19 is repeated. The device returns to its original state.

The threshold level of the fourth threshold unit 16 is set equal to the nominal distortion of the monitored receiver 19 and selected 40%, the threshold level of the third threshold unit 15 is equal to the maximum signal distortion at which the device is still possible, and equal to 45%. The threshold value of the fourth threshold unit 16 is chosen equal to the sensitivity of the device, given by technical and operational documentation. The threshold value of the second threshold unit 13 is chosen equal to the maximum wiring speed at which the controlled receiver 19 is able to perform its functions. Valve 3 is designed to prevent the input signal from the input of the correlator 5 and to the input of the input signal simulator 1.

Claims (1)

Invention Formula A device for monitoring the health of a superheterodyne receiver, containing a serially connected input simulator, a first key and a correlator whose second input is the output of a monitored receiver, a second key whose input is connected to the output of the input simulator, the third and fourth keys, decision block b five 25 0 thirty 35 40 OR, characterized in that, in order to increase the control accuracy, a valve is inserted, the input of which is connected to the output of the first key, and the output is the input of the monitored receiver, serially connected to a signal level meter, the input of which is connected to the output of the second key, and the first threshold unit the output of which is connected to the first inputs of the OR element and the fourth key, the wiring speed measurement unit connected in series, the input of which is connected to the output of the third key, and the second threshold unit whose output It is connected to the second input of the OR element, a third threshold unit connected in series, the input of which is connected to the output of the decision unit, a fourth threshold unit, the second input of which is connected to the output of the decision unit, and a control unit whose output is connected to the first input of the input signal simulator, unit switches, the input and output of which are connected respectively to the second input of the correlator and the first input of the decision unit, the wiring speed control unit, the first input and output of which are connected respectively With the output of the fourth key and the second inputs of the input signal simulator and the decision unit, the output of the correlator is connected to the control inputs of the switching unit and the first key and the second inputs of the control unit and the cabling speed control unit, the second output of the third threshold unit is connected to the second input of the fourth key, the output of the input signal simulator is connected to the first input of the third key, to the second input of which the output of the fourth key is connected. Compiled by E.Golub Editor P.Geershi Tehred. M.Morgental Proofreader Order 4167/56 Circulation 660 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Subscription