SU1702536A1 - Device for measurement of radioreceiver blocking band - Google Patents

Abstract

This invention relates to a radio measuring technique. The purpose of the invention is to increase speed. The goal is achieved by discrete installation using the digital code generator 1, the start pulse generator 17, the second element OR 14.2, the delay element 13, the reversible counter 2 and the digital-to-analog converter 3 of the interfering generator 4 to the frequency of the main channel of the radio receiver 21, tuning by changing the digital code using a generator of 6 rectangular pulses, a controlled switch 7, a reversible counter 2 and a digital-to-analog converter 3 of the generator 4 of an interfering signal to the top blocking the radio receiver 21, repeated discrete restructuring using amplitude comparator 11, differentiation unit 16, second element OR 14.2, and generator 1 of the digital code of the interference signal generator 4 to the frequency of the main reception channel of the radio receiver 21, tuning by changing the digital code using generator 6, controlling switch 7, counter 2 and digital-to-analog converter 3 of the generator 4 of interfering sine npep to the lower border of the blocking band radio receiver and 21, determining, using the second controlled key 10.2, the first and second binary counters 15.1 and 15.2, and the decoder 18, the value of the change of the digits code when rebuilding the generator A of the interfering signal in the blocking band of the radio receiver 21 and calculating r using the digital depot 19 of the ratio of the value of changing the digital code to the value of the digital code corresponding to the frequency of the main receiving channel. 2 Il. 1P X o co oo o o

Description

The invention relates to a radio metering technique and can be used to automatically measure and record the blocking band of radio receivers.

A device for measuring a blocking band of a useful signal by interfering is known, which contains generators of a useful and interfering signal, the outputs of which are connected to the input of the radio receiver under study via a matching unit.

A disadvantage of this device is the low speed due to manual operations in measuring the blocking band of radio receivers.

The closest in technical essence and the achieved result to the invention is a device for measuring the blocking band of radio receivers, containing a series-connected useful signal generator, a matching unit and a radio receiver under study, an interfering signal generator, the first output of which is connected to the second input of the matching unit. - a single reference voltage source and an amplitude comparator, as well as an envelope detector and a recording unit, a key, a servo drive, a waiting multi. ibrator, first, second and third OR elements, first and second inverters, first and second differentiation units, RS flip-flop, frequency meter, calculator and start pulse shaper, while the output of the radio receiver is connected to the input of the envelope detector, the first and second key inputs the respective outputs of the radio receiver and the envelope detector are connected, and the output is connected to the second input of the amplitude comparator, the first differentiation unit connected in series, the input of which is connected to the output of the amplitude comparator, The first inverter, the first OR element, the second input of which is connected to the output of the first inverter, the waiting multivibrator, the second differentiation unit and the second inverter, are connected in series with a frequency meter, the first and second inputs of which are connected respectively to the outputs of the interfering signal generator and the waiting multivibrator, and the calculator, the first and the second control inputs of which are connected respectively to the output of the first OR element and the second input of the interfering signal generator, and the output is connected to the input of the registering unit ka, the second element OR is sequentially connected. the first, second and third inputs of which are connected respectively to the outputs of the first differentiation unit, the first inverter and to the second input of the interfering signal generator, the RS flip-flop and servo drive, the output of which is mechanically connected to the tuning mechanism of the interfering signal generator, as well as serially connected start pulse generator and the third OR element, the second input of which is connected to the output of the second inverter, and the output is connected to the S-input of the RS flip-flop.

A disadvantage of the known device is also the low speed associated with the need to measure the frequencies of the lower and upper limits of the blocking band of the radio receiver and to carry out the operation of comparing the results of these measurements.

The purpose of the invention is to increase the speed of the device by eliminating the measurement of the frequencies of the lower and upper limits of the blocking band of the radio receiver and the exclusion of the operation of comparing the results of these measurements.

Pbl blocking strip - () / fo. where f 1 and fa are the frequencies (on both sides of the frequency f0 of the main reception channel) at which the level of the useful signal decreases below the permissible norm.

This goal is achieved in that the device for measuring the blocking band of radio receivers, comprising a signal generator, a voltage source, series-connected noise signal generator and a matching unit, the second input of which is connected to the output of the signal generator, and the output of the matching unit is the input of the radio receiver under test a series-connected envelope detector, whose input is the output of the radio receiver under study, the first control key that controls the input oh is connected to the output of the envelope detector, an amplitude comparator, the second input of which is connected to the output of the voltage source, a differentiation unit and a third OR element, connected in series to a trigger pulse generator, a second OR element, the second input of which is connected to the output of the differentiation unit, and a delay element , the output of which is connected to the second input of the first element OR, the third element OR. controlled switch, a reversible counter is introduced, the setup, synchronizing and information inputs of which are connected respectively to the outputs of the second OR element, the delay element and the digital driver

code, and the summing and subtracting inputs of the reversible counter are connected respectively to the first and th outputs of the controlled switch, the digital-to-analog converter, the IHED and the output of which are connected respectively to the output of the reversing counter and the input of the interfering signal generator, serially connected first binary counter, the counting input of which connected to the output of the first element OR, and the decoder, the corresponding output of which is connected to the control input of the controlled switch and the first input of the third of the other element OR, another output of the decoder is connected to the input of the digital divider and the second input of the third element OR, connected in series to the pulse generator a second control key, the control of which is connected to the output of the third element OR, AND THE SECONDNAL BAND GHH LC,

the output of which is connected to the second / digital divider input, the combined setup inputs of the first and second binary counters are connected to the output of the trigger pulse generator, the output of the pulse generator is connected to the information input of the controlled switch.

Increasing the device speed is performed by discretely setting the generator of the disturbing signal to the frequency of the main reception channel of the radio receiver under study, restructuring the generator of the interfering signal to the upper boundary of the blocking band of the interfering signal to the frequency of the main channel of receiving the radio receiver, rebuilding the generator of the interfering signal to the lower boundary of the blocking band of the radio receiver, determining the value of changing the digital code n and restructuring of the noise signal generator in a radio band and calculating a blocking ratio changes to the value of the digital code of the digital code corresponding to the primary channel frequency reception.

Thus, the proposed technical solution will have new properties consisting in discrete restructuring of the interfering signal using the digital code of the generator of the main reception channel of the radio receiver, restructuring by smoothly changing the digital code of the interfering signal generator to the upper limit of the blocking band of the radio receiver. using a code generator

Guerr giit p, -) Mr-TPOGR signal of the signal to the main g of the receiver, radio receiver. the restructuring of the GYERNNM by changing the digital count of the horner to the noise interference and gngch. la to 5 lower limit of the cavity of the optical receiver, determining the value of the digital code when the generator is rearranged; interfering signal in the radio blocking band and calculating the ratio

0 flags of change of the digital code to the value of the digital code corresponding to the frequency of the main channel of reception of the radio receiver, providing a new positive effect, turning off

5 enhancing the pysto-action device.

Fig 1 shows a structural diagram of the device 1. GRZ; n FIG. 2 - diagrams explaining it i) 0 here.

Ustra. dt; w for measuring radio transmissions of radio transmitters contains a former. 1 digital codec., Made, for example, as a voltage source with logical voltage outputs O and 1, a reversible counter 2, made 5, for example, on a K155IE6 type microcircuit, digital converter 3, made, for example, but a type microcircuit K572PA V, noise signal generator 4, made, perhaps, on Gunn diodes, matching unit 5, made, for example, in the form of a high-purity tee, type G square impulses, switch-on switch 7., made, for example

5 in the form of a high-frequency relay, a generator And a signal, an envelope detector 9, a symbol and a second control key 10.1 and Yu.2, made, for example, on transistors, the M-capacitor H, made

0, for example, in the form of a Schmitt trigger, a source of 12 voltage reference, made, for example, in the form of a source. element 13 zader; kki, made -, i.rrn- measures in the form of a delay line, pprv1 m.Bicron

5 and the third elements OR 14.1, 142 and 14.2, made, for example, on the bottom / 1 of the memory with obiuefi load, the first and second binary counters 15.1 and 15.2, made, for example, on K155IE5 type microcircuits, block 1 b differentiation, made, for example, in the form of a differentiating circuit, the driver 17 of the start pulse, made, for example, in the form of a generator G6-31. decoder 18, made, for example, nzmchk5 Roshemetetipa K155ID 1, digital1 divider 19, made for example: ia chip type K145IP16, digital indicator 20, made, for example, in the form of a decoder with digital lamps, the radio receiver 21 is sequentially connected 1 digital code, digital divider 19 and digital indicator 20, the generator 4 of the interfering signal is connected in series, the matching unit 5, the second input of which is connected to the output of the signal generator 8, and the output is the input of the studied rad receiver 21, the envelope detector 9, whose input is the output of the radio receiver 21 under study, are connected in series, the first control key 10.1, whose information input is connected to the output of the envelope detector 9, the amplitude comparator 11, the second input of which is connected to the output of the reference voltage source 12, a differentiation unit 16 and the first element OR 14.1. the starting pulse generator 17, the second OR 14.2 element, the second input of which is connected to the output of the differentiation unit 16, and the delay element 13, the output of which is connected to the second input of the first OR 14.1 element, are connected in series with the reversing counter 2, the setup, synchronization and information inputs which are connected respectively to the outputs of the second element OR 14.2, the element 13 of the delay and the generator 1 digital code, and the summing and subtracting inputs are connected to the first and second outputs an input switch 7, and a digital-to-analog converter 3, the output of which is connected to the input of the generator 4 of the interfering signal, are connected in series to the first binary counter 15.1, the counting input of which is connected to the output of the first element OR 14.1, and the decoder 18, the second output of which is connected to the combined control the input of the controlled switch 7 and the first input of the third element OR 14.3, the fourth output is connected to the combined control input of the digital divider 19 and the second input of the third element OR 14.3, the follower connected to the pulse generator 6, the output of which is also connected to the data input of the controllable switch 7. The second controllable switch 10.2, which yuschy control input connected to the output of the third OR gate 14.3. and the second binary counter 15.2, the output of which is connected to the second input of the digital divider 19, wherein the combined setup inputs of the first and second binary counters 15.1 and 15.2 are connected to the output of the trigger pulse generator 17.

The device works as follows: The unmodulated signal X0 from the generator 8 output and the amplitude-modulated noise X from the generator 4 output through the matching unit 5 are fed to the input of the radio receiver 21. The range of frequency change of the generator 4 of the interference signal is based on the requirements of standard technical documentation output signal

valid for the input circuits of the studied radio receiver 21. The frequency of the signal generator 8 is set to the frequency of the main reception channel fo with the output signal level equal to the sensitivity

the radio receiver 21 under study, which generates a V0 signal at its output (Fig. 2a). compared further in amplitude comparator 11 with a predetermined constant voltage Wo0 Wo (Fig. 2a),

corresponding to the output voltage of the studied radio receiver 21 with the allowable value of its coefficient of blogging.

Using the launch item on exit

the starting pulse generator 17 is generated by a single rectangular pulse Ih, which, arriving at the installation inputs of the first and second binary counters 15.1 and 15.2 directly. to the installation input of the reversible counter 2 - through the second element OR 14.2, transfers them to the initial state. Then, through the second element OR 14.2 and the delay element 13 is applied to the synchronizing input of the reversible counter 2 and in binary code generates at its outputs a value that generates the voltage at the output of the digital-analog converter 3 which forms

oscillator 4 signal with frequency f0 of the main reception channel of the studied radio receiver 21. At the same time, from the output of delay element 13, through the first element OR 14.1, the same pulse Ui is fed to the counting

input of the first binary counter 15.1. The magnitude gz of the delay element 13 is selected based on the time of converting the reversible and first binary counters 2 and 15.1 to the initial state, respectively. The first binary counter 15.1 is triggered and at its output in the binary code a voltage G is formed, which, entering the decoder 18, forms the voltage Uz at its second output (Fig. 26) of the logical G. From the second output of the decoder 18, voltage 1 ) 2 is fed to the control input of the controlled switch 7 directly, and to the control input of the second key 10.2 through the third element OR 14.3.

The second control key 10.2 opens and connects the generator output 6 rectangular pulses to the counting input of the second binary counter 15.2, and the normally open contacts of the controlled switch 7 are closed and connected, the generator output 6 square pulses Us (Fig. 26) to the summing input reversible counter 2. In this case, the filling of the volume of the second binary counter 15.2 starts with zero, and the filling of the volume of the reversible counter 2 starts with the value embedded in the shaper 1 of the digital code. The voltage at the output of the digital-to-analog converter 3 begins to increase, and the frequency of the generator 4 begins to increase to the upper limit of its tuning range.

As a result, the frequency of the generator 4 of the interfering signal coincides with the bandwidth of the main reception channel of the examined radio receiver 21 at the output of the envelope detector 9, the envelope voltage of the modulated signal of the generator 4, which closes the first controlled key 10.1, and the voltage V o from the output of the radio receiver 21 to the input amplitude comparator 11 is not received. When the frequency of the generator 4 leaves the bandwidth of the main receiving channel of the examined radio receiver 21, the first controlled key 10.1 opens and the voltage Woo Wobl (Fig. 2a) is fed to the first input of the amplitude comparator 11. When the Wo output voltage reaches the level (Fig. 2a ) at the output of the amplitude comparator 11 a voltage jump I4 is formed (Fig. 2d), which is differentiated by the differentiation unit 16 and in the form of a pointed pulse Us (Fig. 2e) through the first element OR 14.1 is fed to the counting input of the first binary counter 15.1, and through the second element OR 14.2 - to the installation input of the reversible counter 2. Reversible counter 2 is set to the initial state, the value of 2 is generated at the output of the first binary counter 15.1, and the number of pulses 1) at the output of the second binary counter 15.2 (Fig. 2e), needed to tune the generator 4 of the interfering signal from frequency f0 to frequency fa. The voltage 1/2 (fig. 26) at the second output of the decoder 18 disappears and forms the logical O voltage at its third output. The second controlled key 10.2 is locked, the normally open contacts of the controlled switch 7 are opened, and its normally closed contacts are closed, connecting the output of the generator 6 rectangular pulses to the subtracting input of the reversible counter 2 After a time interval r3 from the output of the delay element 13, a delayed pulse of 5 Us enters the control input of the reversible counter 2. and through the first element OR 14 .1 is applied to the count input of the first binary counter 15.1. At the output of the reversible counter, the value of the number preliminarily embedded in the digital code generator 1 is formed, and at the output of the first binary counter 15.1, the value of 3 is generated in the binary code, which produces a voltage Ue at the fourth output of the decoder 18 of the rattor 18 (FIG. 2g) logical 1, From the fourth output of the decoder 18, the voltage Ue (Fig. 2g) of the logical 1 goes to the control input of the digital divider 19, and through the third element OR

0 14.3 is applied to the control input of the second key 10.2. The second control key 10.2 opens and re-connects the generator output of 6 rectangular pulses to the counting input of the second binary counter.

5 15.2. At the same time, the amount of information at the output of the second binary counter 15.2 increases smoothly, and the volume of the reversible counter 2 also decreases smoothly, making the frequency tuning of the interference signal generator 4 to the lower limit of its tuning.

When increasing the output voltage of the voltage regulator of the studied radio receiver 21 to the Wobl level (Fig. 2a, f fH), the output of the amplitude comparator 11 again forms a voltage jump U4 (Fig. 2d), which is differentiated by the differentiation unit 16 and as the second pulse Us ( Fig. 2d) through the first element OR 14.1 supplies 0 s to the counting input of the first binary counter 15.1. At the output of the first binary counter 15.1 in binary code, the value of the number 4 is formed, which changes the voltage Ue to the level of logic O. The 5 output at the output of the third element OR 14.3 also becomes equal to the logical O and the second control key 10.2 closes the counter 15.2 from the output of the generator b is turned off.

0 At the same time, the number of N pulses is recorded at its output, it is necessary to tune the generator 4 in the fH-fB frequency band, which is fed to the second input of the digital divider 19, the first input of which

5, information is output from the digital code generator 1. At the moment when the voltage Ue ends, the digital divider 19 is triggered and on the screen of the digital indicator 20 information about the blocking band of the studied radio receiver 21 is displayed.

If necessary, a set of statistics, the measurement process is repeated.

The proposed technical solution, compared with the prototype, increases the device performance tenfold, which eliminates the frequency measurements of the upper and lower radio blocking band limits and eliminates the comparison of the results of these measurements by choosing the optimal algorithm for measuring the blocking band of the radio receiver under study.

According to the algorithm of the prototype device, the measurement time of the blocking band of a radio receiver is determined by the formula

I tpper t 2 tich

 (fB-fH) / (Af.) 2 + 2TM4.

GDZ (fa-ftO is the tuning range of the interference signal generator;

Tper - time adjustment of the generator of interfering signal,

Af is half the radio bandwidth,

2 Tich frequency measurement frequency frequency of the upper and lower limits of the blocking band of the radio.

Therefore, for example, for a radio receiver with a tuning frequency f0 of 100 MHz and bandwidths and blocking, respectively, 2 Af 1 MHz and Pbl (0.7-3) f0, respectively, and the frequency measurement frequency of the upper and lower frequencies of the blocking band 2TiH 2-10 c get

type 2.3-108 / {5-105) 2 + 21-10 Zs.

The operation algorithm of the proposed technical solution for measuring the blocking band of a radio receiver excludes from the total cost 2Tich time, therefore

TYPT.

Comparing the values of these values, we get

To Type / Type 21 21.

If we consider that the tuning range of the disturbing signal generator when measured by the prototype device exceeds the tuning range of the same generator

the proposed technical solution, this ratio further increases

Thus, the speed of the measurement by the / kyms of the proposed device is increased tenfold compared with the device-prototype

Claims (1)

Claims Device for measuring the blocking of radio receivers on / off, comprising a signal generator, a reference voltage source, a serially connected digital code generator, a digital divider and a digital indicator, a series of interfering signal generator and a matching unit whose second input is connected to the internal signal generator and vych f / p l OGLSORENIYa is the ° & md missile switch - p, radio receiver, ppodoel.eln connected dtektor bending whether Vaod ktoooge is output lg lg, smog radio first - controllable key, the control input of which is connected to / ots / to zprz envelope, amphibious day kg kgrrkssyvhodho korot o c, “dinr |) from the output of the reference source, and IGI I MM flask 1 differential / c 1 1“ n. navigator locator  7anyn d Nürs and the element of OR, the second of which (1K) is equivalent to the output of the block; e differential, vani. and the nickname of the MI HPU with the second input r, -lem ntz CP1 / third element AND control of the s timen tippf kgu1el, otl ochu e e, so r to increase , a reversible counter vcTanoB04Hbin is introduced for synchronization and informa- tion —1 of which (about respectively, are connected by the g-outputs of the second element OR of the delay element and the foriom E1sl digital nedl d f and f fs. inputs j of the aersive counter h) named cooT jeici with first and yo | th outputs / prazl emyo switch. i qi} the analogue converter, the input and the output are strictly connected to the output of the reversible counter and to the input of the generator the signal is connected in series with the first binary counter, the counting input is connected to the output of the first olsmongg of the PI and D81 (the | recorder, which is connected to the control input of the controllable transponder 1 and the first input of the third element OR, the other output of the decoder is connected to the reset trigger of the digital deligli and the second input of the IPI I element irrf icn, connected pulse generator, the second control key, the control input of which is connected to the output of the third OR element, and the second binary counter, the output of which is connected to the second input of the digital divider, the combined setup inputs of the first and second binary counters are connected to the output of the trigger pulse generator, the output of the pulse generator is connected to the information input of the controlled switch. Wo wow Side (base) reception channels and ABOUT Us ABOUT About ABOUT 6 L TO FIG. 2