SU1374147A1 - Device for automated check of sensitivity and tuning frequency of radio sets - Google Patents

Abstract

The invention relates to a measurement technique. The purpose of the invention is to increase the reliability while reducing the monitoring time. The device comprises a tunable frequency generator 1, a voltage stabilizing unit 2, an attenuator 3, a single pulse shaper 4, an automatic voltage setting unit 5, a data processing unit 6, a switch 7, a storage element 8, comparators 9.14, an extremer 10, linearly varying voltage generator 11, switch 12, trigger 20, controlled radio receiver 22. In order to increase the reliability and decrease the monitoring time, introduce two keys 13.16, reference voltage source 15, two delay elements 18.19, second trigger 21 andelement and 17. 5 Il. with $ (L

Description

with

and

11374147

The invention relates to a measurement technique and can be used in automated systems for monitoring radio receivers.

The purpose of the invention is to increase the reliability while reducing the time of control,

Fig. „1 shows a structural electrical circuit of the proposed device; figs 2 and 3 - stress diagrams, as shown in his work; Fig. 4 illustrates an embodiment of an automatic voltage setting unit;

20 and 21 (FIG.), Preparing them for operation, and to the inputs of the first and second delay elements 18 and 19, while from the output of the first element of the check 18 - (fHoZ / |) for the time t at the first input of the element I 17 to Wits 1, and through time, from the output of the second delay element 19 to the input C (fig, Za), the second trigger 21 switches at the second input of the element I 17 also G "Since. 7,

according to Wits

tone

time difference in the first and second delay elements 18 and 19 at the output

in FIG. - a variant of the implementation of an extre- 15 of the element And 17 (fig. 3) according to W.

20 and 21 (FIG.), Preparing them for operation, and to the inputs of the first and second delay elements 18 and 19, while from the output of the first delay element 18 - (fHiOZ / |) for the time t at the first input of the element I 17 through Wits 1, and through time, from the output of the second delay element 19 to the input C (FIG. For), the second trigger 21 switches at the second input of the element I 17 also G Так Since. 7,

according to Wits

then on

the time difference in the first and second delay elements 18 and 19 at the output

matorao

The device for automated monitoring of sensitivity and tuning frequency of radio receivers includes a tunable frequency generator 1, a voltage stabilizing unit 2, an attenuator 3, a single pulse shaper 4, a unit 5 automatic inverting output of the first trigger 20 (fig.Zi) signal unit, data processing unit 6, switch 7, switches the second key 13 and sends element 8 to the reminder, the first one comparing the actuation of the third key torus 9, extremator 10, generator 11.

16, the ac of the non-inverting output of the first flip-flop 20 (figo 3k), the signal 1 switches the switch 7 to a positively varying voltage, the first and second keys 12, 13, sec16, and the ace of the inverter output of the first trigger 20 (figo 3k), the signal 1 switches the switch 7 to 35

40

swarm comparator 14, source 15 support, providing switching of the output voltage, third key 16, element 17, first and second delay elements 18.19, first and second triggers 20.21, controlled radio receiver 22.

The automatic voltage setting unit 5 contains (FIG. 4) two sources 23, 24 of reference voltages, voltage converter 25, comparator-integrator 26, adder 27 and bandpass filter .28. Extremer 10 contains (fig.5) storage capacitor 29, two amplifier 30, 31 and diode 32o

The device works as follows.

At time t, the pulse Reset (FIG. 35) arriving at the inputs of the first and second flip-flops 20 and 21 (FIG. 1), on the inverting outputs of the first and second flip-flops 20, 21 (FIG, ZH, and) are set O, and non-inverting the outputs (Fig. 3, 1c) 1; From the output of the block 6, the driver 4 receives the control signals. Simultaneously with the indication, the former 4 generates a signal 1 at the first output, which is fed to the 1 inputs of the first and second triggers

45

50

55

storage element 8 with the control input of the generator 1 and supplies a ban on the sweep of the generator. Upon completion of the execution of the control signals of the shaper 4, the device is in the initial state.

The Start signal at the time t - from the second output of shaper 4 to input C of the first flip-flop 20 (FIG, 3c) comes a signal that flips the second flip-flop 20 (FIG, 3i, k), while the switch 7 switches the output of the generator II From the control input of the generator 1 and the accelerated sweep of the generator 11 is started, the prohibition of the operation of the third key 16 is lifted and the second key 13 is switched, switching the second output of the block 5 to the inputs of the first and second comparators 9.14 and the input of the extremmer 10 " A change in the voltage of the generator I1 causes changing the frequency at the input of the monitored radio receiver 22, while the block 2 provides the voltage constant of the changed frequency at the input of the attractor 3, the Block 5 provides on the load connected to the output of the monitored radio receiver

which will reset the memory element 8 and the extremer 10, C of the non-inverting output of the second flip-flop 21 (fig 3), the signal O will prohibit measurements in block 6 (for the period of the generator 11 adjustment),

From the inverting output of the first trigger 20 (FIG. 3), the signal O disables the second key 13 and supplies the prohibition on the operation of the third key

switches the second key 13 and supplies the trigger for the operation of the third key

16, the ac of the non-inverting output of the first trigger 20 (fig 3) the signal 1 switches the switch 7 to position 5

0

0 output providing output switching

five

0

five

storage element 8 with the control input of the generator 1 and supplies a ban on the sweep of the generator. Upon completion of the execution of the control signals of the shaper 4, the device is in the initial state.

The Start signal at the time t - from the second output of shaper 4 to input C of the first flip-flop 20 (FIG, 3c) comes a signal that flips the second flip-flop 20 (FIG, 3i, k), while the switch 7 switches the output of the generator II From the control input of the generator 1 and the accelerated sweep of the generator 11 is started, the prohibition of the operation of the third key 16 is lifted and the second key 13 is switched, switching the second output of the block 5 to the inputs of the first and second comparators 9.14 and the input of the extremmer 10 " A change in the voltage of the generator I1 causes changing the frequency at the input of the monitored radio receiver 22, while the block 2 provides the voltage constant of the changed frequency at the input of the attractor 3, the Block 5 provides on the load connected to the output of the monitored radio receiver

22, the standard output power, i.e., the voltage specified at a particular load, is as follows. The output signal of the monitored radio receiver 22, the passage through the band-pass filter 28 (Fig.A), tuned to a frequency of 1000 Hz, is filtered out from extraneous noise and converted into a DC voltage by the converter 25, from the output of which the voltage is applied to the right input of the comparator -integrator 26, to the second input of which a reference voltage is supplied from source 23. The output voltage of the comparator-integrator 26 (second output of block 5) is a constant component of the envelope amplitude-frequency characteristic (AFC) controlled radio receiver 22, after summing up the output voltage of the comparator-integrator 26 with the reference source 24 (U on,) the output voltage of the adder 27 (the first output of the block 5 is the control input of the attenuator 3 (FIG. 1)), t The output voltage of block 5 (output 1) controls the gain of attenuator 3 (figo) so that the output of the monitored radio receiver 22 always has a constant output voltage corresponding to source 23 (UOH) of block 5, attenuator 3 and controlled radio

22 represents a closed-loop controlled system, while changing the magnitude of the source voltage

23 (UOP Figo 4) sets the required output voltage of the monitored radio receiver 22, and by varying the voltage of source 24 (and op, Figo 4), an output voltage of the adder 27 is selected at which the diodes of the attenuator 3 operate in the linear region of the current-voltage characteristics . A constant control voltage of the attenuator 3, equivalent to the high frequency voltage at the antenna input of the monitored radio receiver 22, is supplied from the first output of block 5 to the input of the voltage measurement of block 6 for processing and recording, while the voltage from the second output of block 5 varies in the opposite direction to the change in voltage at the first output of block 5, i.e. when approaching the frequency of the generator 1 to the frequency max

five

0

five

0

five

0

five

0

five

At the same time, the AChC of the controlled radio receiver 22 decreases the voltage at its antenna input and, as a result, the control voltage decreases from the first output of block 5, while from the second output of block 5, the voltage increases.

At the moment of time t, the voltage from the second output of the block (fig.3h) 5 reaches the voltage level Up ,, (figb) of the source 15, the second comparator 14 is triggered and switches the accelerated sweep of the generator 11 (fig.2l, 3 “) On the tracking unit to reduce the dynamic error associated with frequency tuning and setting the level Ujj, j, of the monitored radio receiver 22, tuning unit 5 and generator 1 occurs more slowly

At time t, the voltage of the frequency fj corresponding to the first maximum frequency response of the monitored radio receiver 22 (4-1Go26) is applied to the input of the controlled radio receiver 22 from generator 1, and therefore to the first voltage maximum from the second output of unit 5, which is fed to the input of the extremer 10. Extremetor 10 operates as follows (FIG. 5). As long as the input of the extremator 10 increases, the voltage through the amplifier 30 and the diode 32 charges the storage capacitor 29. The amplifier 31 is covered by 100% negative feedback on it. April, its input and output voltages are equal and equal to the voltage on the storage capacitor 29. As soon as the input voltage of the extruder 10 begins to decrease, the output of the amplifier 30 changes its sign and the diode 32 disconnects the storage capacitor 29 from the output of the amplifier 30, and since the reverse current of the diode 32 is small, and the input impedance of the amplifier 31 is large, the storage capacitor 29 will remember the largest value of input-. voltage at the output of the extremer 10, the voltage will correspond to the voltage on the storage capacitor 29, until the input voltage exceeds the voltage stored by the storage capacitor 29. As soon as the voltage from the second output of the unit 5 (FIG. , 1) will become less voltage from the extremator 10, the first comparator 9,

comparing these voltages, disconnects the first key 12 (Fig. 21). The memorized element 8 memorizes the voltage U} (Fig, 2c |), equal to the output voltage of the generator 11 at the time of tuning to the first maximum. The first comparator 9 is held in state up to time point t4, because up to this point the voltage at the output of extremator 10 (fig2, dashed line) exceeds the voltage from the second output of block 5 (figv, solid. line) „

At time t, the frequency of the generator 7 is positive, which ensures the switching of the output by memory. 8, the voltage level stored by the storage element 8 sets the frequency of the generator 1 corresponding to the maximum frequency response of the monitored radio receiver 22 (frequency fj fig 2b, c, h), and at the first output of block 5 voltage equivalent to that of a controlled radio 20

15

The rator 1 begins to approach the frequency of the next maximum of the frequency response of the controlled radio receiver 22, the increasing voltage from the second output of the unit 5 reaches the level of the output voltage of the extremator 10, the first comparator 9 returns to its original state and closes the first key 12, the voltage on the memory element 8 again, as in wil 25 the time interval between t -tj, monitors the output voltage of the generator 1 1 (fig o 2 6, and 5 h)

At time t j, the frequency of the output voltage of the generator 1 becomes equal to the frequency f of the maximum maximum frequency response of the monitored radio receiver 22o. The first comparator 9 operates and opens the first key 12. The voltage is memorized at the storage element 8. U, equal to the current value of the output voltage of the generator 11 at the time of passing the maximum at the frequency fg (Fig 2b)

35

Emnik 22 at frequency f ,. The voltage from the first output of block 5 is fed to the measuring input of the voltage of block 6, the ac output of the generator 1 frequency ff is fed to the measuring input of the frequency of block 6, while the non-inverting output of the second trigger 21 (fig-j) sends a signal 1, permitting measurement of sensitivity and frequency of control settings; 22 "Second key 13 is required to prevent the first comparator from tripping45

If the AFC maximums are less than .Q pa 9 at the time of the reverse sweep of the generator 11, and the generator 1 and block 5 are tuned to the maximum frequency response of the monitored radio receiver 22, otherwise the first key 12 will be closed and the memorized element will be reset 8, At the end of the measurement, processing and outputting the result about the frequency of tuning ... and the sensitivity and controllability of the third key 16, which terminates the radio receiver 22, unit 6 activates the sweep of the generator 11, inhibits the form Operator 4 O crossed the further useless frequency tuning of generator 1 in the time interval t - t ,,

By the reverse sweep of the oscillation and tuning frequency of the counter 11 (fig.2y), the inputs R of the first and the rolling radio receiver 22 of the anaaa second trigger 20 and 21 are fed into logic 1, these triggers are switched to maximum at the frequency fj then until the end of the generator sweep 11, the voltage stored in memory element 8 is kept equal to U (FIG. 25). At time t, the voltage from the second output of unit 5 decreases and reaches the level of source 15 (FIG. 2 b), while the second comparator 14 returns to its original state and reverse stress and then

the construction of the monitored radio receiver 22 to the next control point;

the output state (FIG. 3g, J, M, k), with the signal O from the inverting output of the first flip-flop 20 (FIG. 3i) the second switch 13 opens, disconnecting the output of the block 5 from the extremator 10 and the first and second comparators 9, 14 and it prohibits the operation of the third key 16, which prohibits the subsequent sweep of the generator 11. The signal 1 from the non-inverting output of the first trigger 20 (FIG. 3) prohibits the next sweep cycle of the generator II and translates

Emnik 22 at frequency f ,. The voltage from the first output of block 5 is fed to the measuring input of the voltage of block 6, the ac output of the generator 1 frequency ff is fed to the measuring input of the frequency of block 6, while the non-inverting output of the second trigger 21 (fig-j) sends a signal 1, permitting measurement of sensitivity and frequency of control settings; A second radio key 13 is needed to prevent the first comparator radio 22 from triggering; the unit 6 feeds a signal to the driver 4 about

the construction of the monitored radio receiver 22 for the next control point

Claims (1)

Claims An apparatus for automated monitoring of sensitivity and tuning frequency of radio receivers, comprising a tunable frequency generator, serially connected voltage stabilization unit and an attenuator whose output is the input of a controlled radio receiver, a serially connected automatic voltage regulator whose input is the output of the monitored radio receiver, and the data processing unit, whose input is connected to the control input of the attenuator, will linearly varying voltage generator, the first key, memory element and switch, the output and second input of which are connected respectively to the control input of the tunable frequency generator and the generator output linearly varying voltage, and the first pulse generator a trigger, the non-inverting output of which is connected to the control to the clock inputs of the generator of the linearly inclined voltage and the switch, successively connected to the extremator and the first The second comparator, the second comparator whose input is connected to the input of the ext remator and the second input of the first comparator, is characterized in that, in order to increase the reliability while reducing the monitoring time, a second key is entered, the input and output of which are connected. Accordingly, the output of the automatic voltage regulator and the input of the electric motor, and the control 47 . eight 5, 35 0 20 25 The input is connected to the inverting output of the first trigger, the source of the reference voltage, the output of which is connected to the second input of the second comparator, the output of which is connected to the second control input of the generator of the linearly varying voltage, the third key, the input and output of which are connected respectively to the output of the second the comparator and the third control input of the generator linearly vary the voltage, and the control input is connected to the inverting output of the first trigger, the first delay element, sequentially connecting The second delay element, the second trigger and the AND element, the second input and output of which are connected respectively to the output of the first delay element and the control inputs of the extremator and the memory element, the second output of the single pulse former are connected to the 1 inputs of the first and second triggers and with the inputs of the first and second elements, the delays, the R inputs of the first and second triggers, the S inputs of which are the Reset inputs, are connected to an additional output of the generator linearly changing the voltage of the voltage, non-inverting the first trigger is connected to the control input - the data processing unit, the second input and output of which are connected respectively to the output of the tunable frequency generator and the input of the single pulse generator, the output of the first comparator is connected to the control input of the first key, the output of the adjustable frequency generator is connected to the input of the stabilization unit tension - -I approach etffxodi vyhoog (Wrigle Fig 5