SU1197108A1 - Device for checking sensitivity of side and intermodulation channels in radio receiver - Google Patents

Abstract

The DEVICE FOR MONITORING SENSITIVITY-SECONDARY AND INTERMODULATION CHANNELS in the RADIO receiver contains serially connected modulated signal generator and matching unit whose output is the radio receiver input, the amplitude comparator connected in series, the input of the receiver, the lead, the lead, the lead, the lead, the lead, the lead-in receiver, and the receiver. RS-trigger and the second RS. Trigger, driver of the reference signal, the output of which is connected to the second input of the amplitude comparator, tion and connected to the control unit unmodulated oscillator signals vgkod information which is connected to the second input matching block, the indicator, the first and second elements coincidence, outputs corresponding kotoryhSoedineny. Actually with the first and second inputs of the indicator, the decoder, the corresponding inputs of which are connected to the outputs of the first and second RS triggers, the first OR element, the peak detector connected in series, the input of which is connected to the first input of the amplitude comparator, differentiation unit, Schmitt trigger, the second driver impulses for. the start and frequency meter, the second input of which is connected to the information output of the unmodulated signal generator, the control output of which is connected to the first inputs of the first and second match elements, the second input of the first match element is connected to the first output of the decoder, the second output of which match and to the first input of the first element OR, the third output of the decoder is connected to the second input of the first element OR and to the third (L input of the indicator, successively; The first envelope detector, the input of which is connected to the input of the peak detector, and the first signal recognition unit, the output of which is connected to the fourth input of the indicator,: differs with what to increase reliability by automatically controlling all side and intermodulation channels the second element OR, sequentially connected to the reset pulse shaper, the storage unit, the second input of which is connected to the third output of the decoder, the AND element, the second recognition block Signals and the third trigger pulse generator, the recorder, the fourth trigger pulse generator, the input and output of which are connected respectively to the output of the first signal recognition unit and the first control input of the recorder,

Description

The second control input and the information input of which are connected respectively with the output of the third shaper trigger and the output tiacTOTOMepa. the control output of the generator of unmodulated signals is connected to the input of the control unit and to the input of the reset pulse shaper, the output of the storage unit is connected to the fifth input of the indicator, the first and quarter outputs of the decoder are connected to the third and fourth inputs of the first OR element, respectively the second OR element and to the second input of the AND element, the output of which is connected to the second input of the second OR element, the output of which is connected to the second input of the first recognition unit signals, the first input of which is connected to the second input of the second signal recognition unit.

one

The invention relates to a radio measuring technology and can be used to automatically control the receptivity levels of radio receivers through side and intermodulation reception channels with simultaneous automatic detection and recording of all frequencies of the side and intermodule reception channels in which the receptivity levels of radio receivers do not satisfy the established norm.

 The aim of the invention is to increase the reliability by automatically controlling all side and intermodules of the ZIIONNY reception channels.

The drawing shows the structural electrical cxeNia of the proposed device.

A device for monitoring the sensitivity of side and intermodulation channels in radio receivers contains a generator of 1 modulated signals, a matching unit 2, a frequency meter 3, an amplitude comparator f, the first 5.1, the second 5.2, the third 5.3 and a quarter 5.4 start pulse shapers, the first 6.1 and the second 6.2 RS - triggers, unmodulated signal generator 7, reference signal driver 8, first 9.1. and second 9.2 match elements, decoder 10, control block 11, indicator 12, consisting of four light boards. Not normal 12.1, Fault 12.2, But Rma 12.3 and Intermodul Qi 12.4, first

13.1 and the second 13.2 elements OR, the envelope detector 14, the shaper 15 reset pulses, the storage unit 16, the element And 17, the first block

18 signal recognition, peak detector 19, recorder 20, second signal recognition unit 21, Schmitt trigger 22, differentiation unit 23. The device has

also radio 24.

The device works as follows.

At the initial moment, the unmodulated XH signal from the generator 7 output

and the modulated signal X "from the output of the generator 1, equal to the predetermined rate U., through the matching unit 2 is fed to the input of the radio receiver 24. The frequency of the generator is 7 unmodulated

Signals are installed. On top

the control range limit f, a, the frequency of the 1 modulated oscillator generator is set outside the bandwidth of the main channel

receiving the radio receiver 24. At the input of the p-radio receiver 24 of the X level signal, which is equal to a given norm, the output of the radio receiver 24 produces a signal Y, comparing

further with the level of the reference signal Y ,, generated by the shaper 8 of the reference signal. The control unit 1I performs a smooth change of the frequency of the generator 7-in the controlled range f - f. In this case, the following control results can occur. 1. The case of a malfunction of the monitored radio receiver 24. At the same time, at the output of the amplitude comparator 4, the difference signal D Yg- YO is negative (LU O) in the controlled frequency range f - f and the first driver 5.1 of start pulses is locked. From his way out and the first RS-trigger 6.1 will not receive a single pulse. : 0ba RS. the triggers 6.1 and 6.2 are in the initial state 1. In this case, the four outputs of the decoder 10 are in the following states: U, FO; Uj Uj U (, 0. At the end of the range, the control at frequency f from the control output of the generator 7 on the first 9.1 and second 9.2 coincidence elements and the control unit 11 receives the voltage Us. First element 9.1 coincides, including the indicator. 12, on the light panel Fault 12.2 of which is displayed, the Fault signal and the frequency tuning of the generator 7 is stopped by the servo drive of the control unit 11. 2. If the reception channels are satisfied with the normal rate, in this case the frequency of the generator 7 coincides with the main frequency Radio 24 channel output amplitude comparator 4 generates a positive signal, which enters the first driver 5.1 start pulse generates a single pulse with a pointed shape L /, transfer the first 6.1 and second 6.2 P, 5 -trigger 6.1 and 6.2 of states 1, 1 to the state O, 1. At the same time, at the output of the decoder 10 and, from U (, 0, and O B), the end of the control range is often {from the control output of the generator; torus 7 to the first 9.1 and second 9.2 elements of coincidence and The control unit 11 receives the voltage Uj, the second element 9.2 of the coincidence m including indikator.12 on board .svetovom Norn 12.3 kotorog vysvechivaets norm signal and pereotroyka The frequencies of generator 7 servo control unit 11 is stopped. In this case, as a result of the passage of the signal from the generator 7 in the passband of the radio receiver 24, the output voltage of the peak detector UT is formed at the output of the peak detector 19. which varies in proportion to the amplitude-frequency characteristic of the radio receiver 24 and is fed to the differentiation unit 23. The positive voltage of the differentiation unit 2.3 triggers the Schmitt trigger 22 to position 1. When the frequency of the generator 7 of the unmodulated signals coincides with the resonant frequency of the receiving channel of the radio receiver 24 at the output of the unit 23 .. of differentiation, a voltage equal to zero is formed, which translates Schmitt trigger 22 from the logical 1 position to the logical state. The voltage jump of the Schmitt trigger 22 is differentiated by the second driver 5.2 of the start pulse and is fed to the clock input of the meter 3. The latter is triggered and measures the frequency of the receive-radio receiver channel 24. In this case, when the susceptibility rate is met, the secondary receiver 24 channels are measured often the main reception channel. 3. A case of dissatisfaction of the receptivity of the receiving channels with the established rate .; At the same time, on the frequency of the main reception channel and on the frequency of one side or intermodulation reception channel of the radio receiver 24, the susceptibility levels of which do not satisfy the established rate (or at the frequencies of any two reception channels), the output signal 0 is produced at the output of the amplitude comparator 4. at the output of the first shaper 5.1 of the start-up pulses, two pulses are produced that transfer ne; 6.1 and the second 6.2 RS ttriggers from the initial state 1, 1 to the 1, O state, as a result of which at the output of the decoder 10 take place p and voltage U7. .. The voltage and is reminiscent of the storage unit 16 and arrives at the element And 17. At the same time, on the light panel Not the norm 12.1 of the indicator 12 the signal is constantly displayed Not the norm, but the restructuring of the generator 7 continues. When the frequency of the generator 7 of the unmodulated signals coincides with the frequency of the next reception channel of the radio receiver 24 on the frequency of the amplitude comparator 4, the signal uV O is generated again. acting on the first driver 5. the start pulse generates one more pulse of the pointed Ug form, which translates the first 6.1 and the second 6.2 RS triggers from the 1, O state to the O, O position. At the output of the decoder 10 II. Uj is UZ O, and Uj, f O. Element And J7 is activated and the voltage Ug is applied to the first 18 and second 2I signal recognition units. In the case of the formation of a side reception channel at the output of the envelope detector 14, no envelope of the modulated signal of the generator 1 is formed, therefore the second signal recognition unit 21 is triggered and at the output of the third, the trigger pulse generator 5.3, a pulse U is generated. The registrar 20 will work and record the frequency of the side reception channel. . When passing to the output of the radio receiver 24, the signal formed as a result of intermodulation, at the output of the detector 14, envelopes the modulating signal of oscillator 1, the voltage U, Uj or and / will not be equal to zero. Thus, ohm, the first input of the first signal recognition unit 18, from the output of the envelope 14, will receive the voltage U, o and the second input through the first element OR 13.1 and the second element 1Sh 13.2 - the voltage U, Uj or Uj. The first signal recognition unit 18 is triggered, the indicator 12 turns on, on the Intermodule 12.4 light panel of which the Intermodule signal arriving at the fourth driver 5.4 of the trigger pulses is highlighted. At the output of the latter, a pulse U is produced, which turns on the recorder 20, which fixes the frequency of the intermodulation reception channel. At the level of rationing often. side and intermodule reception channels are defined in the same way as shown for the main reception channel. If the frequency of the generator 7 coincides with the next receiving channel, the signal and V O is again formed at the output of the radio receiver 24, which translates the first 6.1 and second 6.2 RS triggers from the O, O state to 1, 1. The output of the decoder 10 produces a voltage Ug UZ and -O, and and, F About, etc. At the end of the measurement range at the frequency {from the control output of the generator 7, the voltage Uj is applied to the input of the control unit 11 and the former 15 reset pulses. The frequency tuning of the generator 7 is terminated, and on the output of the former 15. a pulse U is formed, and the otor erases the memory in the memory block 16.

Claims (1)

DEVICE FOR CONTROLLING SENSITIVITY OF ADVERSE AND INTERMODULATION CHANNELS IN RADIO RECEIVERS, containing serially connected modulated signal generator and matching unit, the output of which is the input of the radio receiver, serially connected amplitude comparator, the input of which is the output of the radio receiver, the first trigger pulser and the first RS RS.trigger, driver of the reference signal, the output of which is connected to the second input of the amplitude comparator, in series with a separate control unit and an unmodulated signal generator, the information output of which is connected to the second input of the matching unit, an indicator, first and second matching elements, the outputs of which are connected respectively. ··· with the first and second inputs of the indicator, a decoder, the corresponding inputs of which are connected to the outputs the first and second R5 triggers, the first OR element, a peak detector connected in series, the input of which is connected to the first input of the amplitude comparator, differentiation unit, Schmit trigger a, a second trigger pulse generator and a frequency meter, the second input of which is connected to the information output of the unmodulated signal generator, the control output of which is connected to the first inputs of the first and second coincidence elements, the second input of the first coincidence element is connected to the first output of the decoder, the second output of which is connected to the second input of the second matching element and to the first input of the first OR element, the third decoder output is connected to the second input of the first OR element and to the third torus, succession. a closely coupled envelope detector, the input of which is connected to the input of the peak detector, and the first. a signal recognition unit, the output of which is connected to the fourth input of the indicator, characterized in that, in order to increase reliability by automatically monitoring all side and intermodulation reception channels, a second OR element is introduced into it, series-connected reset pulse generator, a memory unit, the second input of which connected to the third output of the decoder, the And element, the second signal recognition unit and the third trigger pulse shaper, the recorder, the fourth 'trigger pulse shaper ka, input and output of which are respectively connected with the output of the first signal detection unit and the first control input of the recorder, 1 1974 08 the second control input and information input of which are connected respectively to the output of the third trigger pulse generator and the output of the Frequency meter, the control output of the unmodulated signal generator is connected to the input of the control unit and to the input of the reset pulse generator, the output of the storage unit is connected to the fifth indicator input, the first and the fourth outputs of the decoder are connected respectively to the third and fourth inputs of the first OR element, the output of which is connected to the first input of the second OR element and to the second input of the AND element, the output of which is connected to the second input of the second OR element, the output of which is connected to the second input of the first signal recognition unit, the first input of which is connected to the second input of the second signal recognition unit.