SU1177759A2 - Device for measuring susceptibility and frequency selectivity of channels of radio receiver to side components of carrier frequency - Google Patents

Abstract

A DEVICE FOR MEASURING THE PERSPECTIVENESS AND FREQUENCY SELECTIVITY OF CHANNELS OF A RADIO RECEIVER TO THE SIDE PARTS OF THE CARRIER FREQUENCY according to the author. St. (1104431, characterized in that, in order to expand the functionality of the device, a serially connected delay block is inputted into it, the input of which is connected to the output of a voltage meter, a digital adder and an electronic key, the output of which is connected to the third input of the recorder, serially connected norm code, the output of which is also connected to the second input of the digital adder, and the first digital comparison unit, the second input of which is connected to the output of the voltage meter, the last the first cut-off frequency code digital shaper, the second comparison digital block, the AND element and the OR output of which is connected to the second input of the electronic key, as well as the second limit frequency digital shaper serial generator and the third digital block (L comparison, the output of which is connected to the second input of the element I, while the output of the frequency meter is connected to the second inputs of the second and third digital comparison blocks, and the output of the first digital comparator block is connected to the second th input of the OR, Dr. JV; about

Description

The invention relates to radio technology, can be used to automatically measure and record the susceptibility levels and frequencies of the side channels of reception of radio receivers, and is an improvement of the device according to the basic author. St. No. 1104431, The purpose of the invention is to expand the functional capabilities of the device due to the possibility of automatically controlling the sensitivity levels of the side reception channels for the receivers to match their values with nominal values, which shortens the test time of the radio receiver, FIG. 1 shows a block diagram of the proposed device; in fig. 2 voltage plots for the device operation. A device for measuring the sensitivity and frequency selectivity of the channels of a radio receiver to the secondary components, the frequency generator 1 signals, the first 2.1 and the second 2.2 switches, transmitting 3 and receiving 4 antennas, studied radio receiver 5 with input 6 and output 7 clamps, adder 8, block 9 of the leveling of the comparion, ny, first 10.1 and second 10.2 triggers, frequency meter 11, amplifier 12 of the control signal, the first 13.1 ,. the second 13.2 and the third 13.3 diffraction blocks, made in the form of differentiating circuits, the limiter 14 on top, the trigger element 15, made in the form of a contact button, the storage unit 16, made in the form of a peak detector, with a reset, the voltage meter 17, waiting multivibrator 18, recorder 19 made in the form of a digitizer, reference voltage source 20, two-way amplifier 21, limiter 22 from the bottom, delay block 23, first 24.1, second 24.2, and third 24.3 digital comparison blocks, first 25.1 and second 25.2 shapers of the digital cut-off frequency code, digital adder 26, element AND 27, element OR 28, electronic key 29 and shaper 30 of the digital norm code. In this case, the source is connected in series. 20 reference stress. 1 592 start element 15, the first trigger 10.1., 1 signal generator and frequency meter 11, the movable contact of the first switch 2.1 is connected to the output of the signal generator 1, and one of the fixed contacts is connected to the input of the transmitting antenna 3, one of the fixed contacts the second switch 2.2 is connected to the second fixed contact of the first switch 2.1, and the second fixed contact is connected to the output of the receiving antenna 4, the input transceiver 6 of the studied radio receiver 5 is connected to the moving contact of the second switch 2.2, the output the clamp 7 of the studied radio receiver 5 is connected to the input of the level generation unit 9 - comparing; the adder 8 is connected in series, the first and second inputs of which are connected respectively to the output terminal 7 of the radio receiver 5 and the output of the comparative level generation unit 9, the output signal which is also connected to the second control input of the signal generator 1, the storage unit 16, the voltage meter 17 and the recorder 19, to the second input of which the output of the frequency meter 11 is connected, are connected in series An extended multivibrator 18, the input of which is connected to the output of the second trigger 10.2, the first differentiation unit 13.1, the output of which is also connected to the input of the second trigger 10.2, and the limiter 14 from above, the output of which is connected to the second input of the storage unit 16, are connected in series to the second a differentiation unit 13.2, the input of which is connected to the first input of the storage unit 16, an amplifier two-way limiter 21, a third differentiation unit 13.3 and a limiter 22 from the bottom, the output of which is connected to the second input of the second trigger 10.2, the output of which is also connected to the right direct Ith input of the frequency meter 11 and the voltage meter 17, is connected in series to the delay unit 23, the input of which is connected to the output of the voltage meter 17, the digital adder 26 and the electronic switch 29, the output of which is connected to the third input of the recorder 19 sequentially connected shaper 30

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a digital norm code, the output of which is also connected to the second input of the digital adder 26, and the first digital comparator unit 24.1, the second input of which is connected to the output of the voltage meter 17, are connected in series to the first shaper 25.1 of the digital cutoff frequency code, second element And 27 and the element OR 28, the output of which is connected to the control input of the electronic key 29, as well as the second shaper of the digital cut-off frequency code and the third digital comparator block 24.3 are connected in series The output of which is connected to the second input element And 27, while the second output of the signal generator 1 is connected to the second input of the first trigger 10.1, the output of the frequency meter 11 is also connected to the second inputs of the second 24.2 and third 24.3 digital comparison blocks, and the output of the first digital comparison block 24.1 connected to the second input of the element OR 28.

The device works as follows.

The frequency f of the signal generator 1 is set to the lower limit of the measurement range f. The signal of the maximum level X otKC initial moment of time, the first 10.1 and second 10.2 triggers are in the initial state O, is applied to the input of the radio receiver 5. In this case, the voltages corresponding to the logical O, which are fed to the first control input of the generator 1, are generated at their outputs. signals, the control inputs of the frequency meter 1 and the voltage meter 17 and the input of the waiting multivibrator 18, respectively. From the voltage source 20, when closing and the contact button 15, is supplied to the first input of the first trigger 10.1, the voltage U, which transfers it to position 1. At the output of the trigger 10.1, the voltage U corresponding to logical 1 is applied, which makes a smooth change in the frequency of the generator 1 signals in the frequency range of, .f, - (f measure r-y.

When the frequency of the generator 1 signals coincides with the passband of the first side channel of reception on

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The output of the radio receiver 5 produces a signal y, which is fed to the first input of the adder 8, to the second input of which a reference signal of the opposite polarity (-Ud) is applied. The output of the adder 8 produces a signal L, which is fed to the input of the amplifier 12 of the control signal. From its output, the amplified Q signal of negative polarity U (Fig. 2a) is fed to the second control input of the signal generator 1, reducing its output signal level and, accordingly, the value 4U. . In this case, since the level of the output signal of the generator 1 is unambiguously related to the magnitude of the control voltage and, when the generator 1 is tuned in frequency, when the change in the output level of the generator 1 corresponds to the amplitude-frequency characteristic of the side reception channel, the change in control voltage also corresponds to amplitude. Frequency response of the receive side channel. At the same time, the voltage from the output of the control signal amplifier 12 is applied to the inputs of the memory unit 16 and the second differentiation unit 13.2. At the exit

the latter is produced ex. Ug- (Fig. 2b), which changes its polarity at the moment when the negative voltage at the output of the amplifier 12 of the control signal

5 reaches the maximum value

corresponding to the maximum susceptibility of the measured side reception channel. At the time of changing the polarity of the voltage U with

the amplifier of the two-sided limiter 21 (Fig. 2, c), the third differentiation unit 13.3 (Fig. 2, d) and the limiter 22 from the bottom a positive pointed pulse is formed

Uj (Fig. 2, d), which translates

the second trigger 10.2 from the state O to position 1. The output of the trigger 10.2 produces a voltage IL corresponding to logical 1, which puts the frequency meter 11 and the voltage meter 17 into the measurement mode, and also starts the waiting multivibrator 18. Maximum negative voltage

 The corresponding maximum susceptibility of the measured side reception channel and stored in the storage unit 16 is measured by a voltage meter 17. The results of measuring the frequency and susceptibility of the side reception channel are recorded by the recorder 19. At the same time, the result of measuring the susceptibility of the side reception channel from the output of the meter 17 goes to the second input of the first digital block 24.1 of the equation and through the block 23 to the first input. the second inputs of which from the imaging unit 30 are supplied with a digital voltage code corresponding to the established standard for susceptibility of side reception channels. If the maximum value, measured by gauge 17, for example, the absolute value is greater than the established standard for susceptibility of the radio receiver 5 under investigation, then the output of the first digital block 2D.1 of the comparison produces a voltage corresponding to the logical O, the electronic key 29 is the difference between the measured maximum value y ;; the equal voltage U4M ' Kc and the voltage value supplied c. The generator 30 of the digital norm code, which is equal to the inconsistency level of the receptivity of the side reception channel, is set to the norm, in the digital code goes to the third input of the recorder 19, i.e. in this case, the frequency of the side reception channel is recorded on the recorder 19, its frequency is perceived, and the susceptibility level of the side reception channel does not correspond to the established rate. If the norm on the susceptibility of the studied radio receiver 5 is fulfilled by side reception channels (the control voltage U. j. Is in absolute value less than the established norm, then the output of the first digital comparison unit 24.1 produces a voltage corresponding to logical 1, which through the OR 2 element closes the electronic key 29, and the signal from the output of the digital adder 26 to the recorder 19 is not received, that is, it only detects the frequency of the side reception channel; And its susceptibility level. Block 23. It recognizes the possibility of entering control voltage information into a digital adder 26 and, therefore, falsely recording the results of the summation for the time required for the first digital comparator 24.1 to operate and the electronic key 29. The pulse duration of the waiting multivibrator 18 is selected on the basis of the time required for registering the received data. At the moment of the end of the impulse of the waiting multivibrator 18 its falling edge is differentiated by the block 13.1 10.2 rigger to state .. On the Frequency Meter 11 and 17 are turned off voltage, and the reset pulse Ug, worked out from the top stopper 14, the storage unit 16 is transferred to its original state. When the frequency of oscillator 1 of signal C coincides with the bandwidth of the next side reception channel, the whole process repeats. In a nonnormable frequency band, including the main reception channel of the studied radio receiver 5, the upper and lower frequency frequencies of which are set respectively by the first 25.1 and second 25.2 digital frequency code generators, the outputs of the second 24.2 and third 24.3 digital blocks of the comparison are generated; logical 1, which arrive respectively at the first and second inputs of the element AND 27. At the same time, the output of the element 27 also produces a voltage corresponding to logical 1, which nt OR 28 closes electronic switch 29 and thereby eliminates false registration information nevsholnenii susceptibility standards for side channels nonnormable reception frequency band. When the upper frequency of the measurement range f is reached from the signal generator 1, a voltage is applied to the second input of the first trigger 10.1, which returns it to the O state, and the measurement process is terminated.

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Claims (1)

DEVICE FOR MEASURING SUSCEPTIBILITY AND FREQUENCY SELECTIVITY OF RADIO RECEIVER CHANNELS TO ADVANCED COMPONENTS OF THE CARRIER FREQUENCY by ed. St. No. 1104431, characterized in that, in order to expand the functionality of the device, a series-connected delay unit is inserted into it, the input of which is connected to the output of the voltage meter, a digital adder and an electronic key, the output of which is connected to the third input of the recorder, and the digital code generator is connected in series the norm, the output of which is also connected to the second input of the digital adder, and the first digital comparison unit, the second input of which is connected to the output of the voltage meter, of the sequence but connected to the first generator of the digital code of the cutoff frequency, the second digital comparison unit, the AND element and the OR element, the output of which is connected to the second input of the electronic key, as well as the series-connected second generator of the digital code of the cutoff frequency and the third digital comparison unit, the output of which is connected to the second the input of the element And, while the output of the frequency meter is connected to the second inputs of the second and third digital comparison units, and the output of the first digital comparison unit is connected to the second input of the element that OR.