SU1494231A2 - Device for checking serviceability of superheterodine receiver - Google Patents

Abstract

This invention relates to a radio technique. The purpose of the invention is to increase the reliability of the control. In order to achieve the goal, a noise level meter 19, fifth and sixth threshold blocks 20, 26, keys 21 and 25, an additional control block 22, noise generator 23 and And 27 element are entered into the device. The device will improve the accuracy of control of the superheterodyne receiver by increasing the accuracy control of its good condition. 1 il.

Description

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

The purpose of the invention is to increase the reliability of the control.

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

The device for monitoring the health of the superheterodyne receiver contains an input signal simulator 1, “na, first switch 2, valve 3, control unit 15 4, correlator 5, second switch 6, signal level meter 7, first threshold unit 8, OR element 9, speed control unit 10

telegraphy, third key 11, 20 telegraphy speed measurement unit 12, second threshold unit 13, decision unit 14, third and fourth threshold units 15 and 16, fourth key 17, switching unit 18, Eguma level meter 19, fifth threshold block 20, fifth key 21, additional control block 22, noise generator 23, adder 24, sixth key 25, sixth threshold unit 26, JQ element I 27, also a superheterodyne receiver 28 being monitored,

The device works as follows.

In the absence of a useful signal 35, a signal is present at the input of the superheterodyne controlled receiver 28 at the output of the correlator 5, which opens the first key 2 and switches the output of the controlled superheterodyne receiver 28 with the power of the switching unit 18 to the signal imitator 1 and noise generator 23 with nominal level TSC, If 5 distortions introduced by the superheterodyne controlled by the receiver 28 exceeds the norm, then at the output of the fourth threshold block 16 there is a signal An alarm that CQ enters the input of the element OR 9 and signals the need to replace the configured superheterodyne receiver 28 or make redundancy. If the distortion introduced by the controlled superheterodyne receiver 28 is normal, but the output of the fourth threshold block 16 contains a signal arrives at the entrance

The simulator 1 signal level control unit 4, the latter generates a signal whose level changes linearly stepwise with a signal from the fourth threshold unit 16, which characterizes the normal operation of the superheteroin controlled receiver 28 according to the distortions measured by the decision unit 14,

This process takes place until the output of the fourth threshold block 16 does not 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,

If the level is normal, the output signal of the Normal is present at the output of the first threshold block 8, otherwise the Alarm signal, the Normal signal is fed to the input of the fourth key 17 and opens it. The fourth threshold block 16 has a threshold level exceeding the threshold level of the third threshold block 15, therefore, if there is an Avari signal, the Normal signal is present at the input of the fourth threshold block 16 at the output of the third threshold block 15, through the open fourth key 17 the control signal the wiring speed control unit 10 of the input signal simulator 1. The latter generates signals whose cabling speed varies linearly in steps when the Norma signal is present from the output of the third threshold unit 15. In addition, unit 10 sets the signal change rate of signal distortion introduced by the superheterodyne receiver 28, the decision unit 14, similar to the telegraph speed simulator 1 input signal. Decider unit 14 evaluates the distortion introduced by the superheterodyne-controlled receiver 28.

When the norm distortions are exceeded, a signal from Avariya is present at the output of the third threshold unit 15, which opens the third key 11 and stops changing the cabling speed using block 10, the third key 11 is open and simulator 1 signals are fed to the input of the telegraph speed measuring unit 12, which determines the speed of the telegraph 5

Simulator 1, in which an emergency condition of the monitored superheterodyne receiver 28 is observed.

If this speed exceeds the rate set by block 10, then the output of the signal is Norm. Otherwise, at the output of the second threshold unit 13 there is a signal Avari. The signal Norm from the output of the second threshold unit 13 is fed to the input of the element And 27, at the other input of which there is a signal Norm from the output of the first threshold unit 8. From the output of the element And 27 the signal Norm opens the fifth key 21,

Fifth threshold unit 20 has a level less than the third threshold unit 15, therefore, when the fourth and third threshold units 16 and 15 of the Avari signal are present at the outputs, the Normal signal is present at the output of the fifth threshold unit 20. This signal through the open fifth key 21 is fed to the control input of an additional unit 22 for changing the noise level of the noise generator 23. The latter generates a noise, the level of which is incremented according to a linear law in the presence of a Norma signal from a fifth threshold block 20. Decision block 14 evaluates the distortions introduced by the superheterodyne-controlled receiver 28. I

When the norm is exceeded, the output of the Avg threshold block 20 contains an Avariya signal that opens the sixth key 25 and stops changing the noise level of the generator 23 with the help of an additional block 22. The sixth key 25 is open and the signal from the generator 23 goes to the meter 19, which measures the level generator noise 23, at which the emergency state of the monitored superheterodyne receiver 28 is observed.

If this noise level is normal, then at the output of the sixth threshold block 26 is a signal from Avariya. The resetting of the wiring rate control unit 10 and the control unit A, as well as the additional control unit 22, is performed by the signal of the correlator 5 when the signal of the correspondent disappears.

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The cycle of operation of the device for monitoring the health of the superheterodyne monitored receiver is repeated. The device returns to its original state. The threshold level of the fourth threshold unit 16 is set equal to the normative distortion of the superheterodyne monitored receiver 28 and equal to 40%, the threshold level of the third threshold unit 15 is equal to the limit signal distortions at which the device can work, and equal to 45%. Threshold level n

15 poroPCH block 20 is equal to the limiting distortion of the superheterodyne receiver being monitored in the presence of interference and is chosen to be 20%. the threshold of the fourth threshold

0 of block 16 is chosen equal to the sensitivity of the device, given by technical and operational documentation, the threshold value of the second threshold block 13 is chosen equal to

25 maximum wiring speed at which the monitored superheterodyne receiver 28 is capable of performing its functions. The threshold value of the sixth threshold unit 26 equals 0 at the maximum wiring speed, taking into account the maximum noise level at which the superheterodyne receiver 28 is capable of performing its functions. Valve 3 is designed to prevent the input signal from the correlator 3 from entering the communication channel (not shown). The adder 24 performs the addition of signals from the output of the simulator 1

.Q and generator output 23 before feeding them through a valve to the input of a superheterodyne controlled receiver 28.

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Claims (1)

Invention Formula Device for monitoring the health of a superheterodyne receiver auth.St. No. 1418920, characterized in that, in order to increase the reliability of the control, an AND element is introduced into it, the first and second inputs of which are connected respectively to the outputs of the first and second threshold units, sequentially connected fifth threshold block, the input of which is connected to the output of the decision block, fifth key, the control input of which is connected to the output of the AND element, additional control block 7 14942318 nor, the second input of which is connected to the fourth input of the elements by the output of the correlator of the torus, and the generator OR, the output of the fourth threshold noise, serially connected unit connected to the control of a good key, the first and second inputs to the second key, the generator output which are connected respectively noise - to the second input of the adder, with the outputs of the fifth key and the generator generated between the outputs of the simulator noise meter, noise level and neck-input signal and information 1; That threshold block, the output of which is the input of the first key.