SU1540016A1 - Device for checking serviceability of heterodyne radio receiver - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the reliability of the control. To achieve the goal, the device containing the input signal simulator 1, counter 2, decisive unit 7, keys 8, 16, recording unit 9, r-11 pulses, sensitivity sensitivity measuring unit 3, ADC 4, switching unit 5, shift register 6 , RS flip-flop 10, synthesizer 12 frequency, block 13 frequency tuning and shaper 14 time control. Reliability is enhanced by providing diagnostics and predicting receiver failures during its operation. 1 il.

Description

The invention relates to radio engineering and can be used for automated monitoring of the health of a superheterodyne radio receiver.

The purpose of the invention is to increase the access (6-10 hours) from the desk of the operator on duty (not shown) to the S-input of the RS-trigger 10. The RS-trigger 10 starts the pulse generator 11 with its output signal. Clock pulses with a given frequency, depending on the characteristics of the control accuracy.

The drawing shows a structural electrical diagram of the proposed device.

| The device for monitoring the health of the superheterodyne radio receiver contains a simulator 1 of the input signal, counter 2, measurement unit 3, sensitivity 5, analog-to-digital converter (ADC) 4, switching unit 5, shift register 6, deciding bioc 7, first key 8, recording unit 9 , RS-trigger 10, generator 20 11 pulses, synthesizer 12 frequencies, brok 13 frequency tuning, shaper 14 control time, threshold · block 15 and second key 16 $

The drawing also shows a controllable superheterodyne radio receiver 17.

The device operates as follows.

In the initial state, the Sensitivity of the superheterodyne controlled radio receiver 17 is measured. At the frequency of receiving information signals without disturbing the reception of working information signals using sensitivity measurement unit 3. This is achieved through the use of a Broadband Meter.

What signal simulator 1 input dd

A signal that is compatible with an information signal. The sensitivity value U, measured at the frequency, is fed to the input of the ADC and through block 5 switches to the input of the threshold block 15. The threshold block 15 compares the digital value of the sensitivity U with the established norm

Uj | and generates Norma ”and Alarm signals. The Norma signal of the threshold block 15 opens the Second key 16, allowing the Control signal to be received at the S-input of the RS trigger 10. The Control mode is carried out in the absence of reception of signal signals. The Control signal is received from the control input periodically (for the Prism receiver operating in continuous mode, the frequency of the superheterodyne radio receiver 17 and the accuracy of measuring the measurement sensitivity are received at the input of the frequency synthesizer 12. The synthesizer 12 is designed to store frequency codes that are read by clock pulses to the input of the block frequency adjustment. frequency tuning unit 13 is controlled to adjust a superheterodyne radio receiver 17 to control the frequency f _1, f _2, ..., f _k pa range frequency, the codes of which are stored in the synthesizer 12. The number of control frequencies i = 1, k is selected based on the reliability of the control and the range of operating frequencies.After the tuning of the superheterodyne radio receiver 17 is completed, using the frequency tuning unit 13 to the 1st control frequency f., i = 1, k, the Configured signal appears at the second output of the frequency tuning block 13. It starts the monitoring time generator 14. The monitoring time generator 14 after the monitoring time (t ^, 5-15 s) generates a polling signal of the measurement unit 3 sensitivity? The sensitivity value U. is fed to the input of the ADC 4 and the switching unit 5 (at the control input of which the signal 1 is from the output of the RS-trigger) to the input of the shift register 6 and to the second input of the decision unit 7. The clock input from the shift register 6 receives clock pulses from the output of the shaper 14 time control. The decision block 7 compares the sensitivity values Uy measured in the j-th cycle of the Control with the sensitivity value Nu'v (jl) -M cycle. It is known that during operation, aging of the elements occurs, which leads to a deterioration of sensitivities, i.e. Uy 7 Consequently, if in the jth cycle Control sensitivity Uy at a frequency f. ₍ arriving at the second input of the deciding unit 7 and simultaneously recording the direct i-th clock signal of the driver in the shift register 6, exceeds the sensitivity 1J · · measured in the previous (jl) -M cycle Control coming from the shift register 6 by the i-th clock signal to the first 'g input of the decision block 7, then at the output of the decision block 7 there is an Alarm signal that opens the first key 8, and the frequency code f. goes to the input of the recording block 9, which 10 according to the data of the frequency code f _f ·, on which there was a deterioration in sensitivity, class itsiruet nature (type) fault. For example, radio 155 P P 15 having di- apazone frequency fif = (1,5-30) MHz algorithm recording unit 9 has vid.pokazanny table.

Frequency Number (Code) Frequency rating Character (type) of malfunction 2 ° 1 2,8 Failure PLF 2 2.2 Input failure transformer 1,2 Preselector Failure 3.2 Failure of the second UHF cascade in the LZ

If when measuring sensitivity, its value at the information frequency G _inf exceeds the norm, then at the output of the 35th threshold block 15, the Alarm signal sets the shift register 6 to zero (input R) and closes the second key 16, preventing the Control signal from entering for 40 S -the input of the RS-trigger 10. In addition, counter 2 is used to count the pulses of the 11 pulse generator .. When the counter receives the 2nd (k + 1) th clock pulse, where k is the number of control frequencies, the counter output 7 appears fill signal that arrives to the second input of the synthesizer 12. A frequency code corresponding to the information frequency — 50 te ^ — goes to the input of block 13, which tunes the monitored superheterodyne radio receiver 17 to the frequency f _inf . In addition, the signal from the output of counter 2 sets to 55 0 RS-trigger 10 (input R). The device is reset.

Claims (1)

Claim A device for monitoring the health of a superheterodyne radio receiver containing an input signal simulator, a counter, a pulse generator, a deciding unit, first and second keys, a recording unit, characterized in that, in order to increase the reliability of control, an RS-trigger, R-input and S- are introduced the input of which is connected respectively to the output of the counter, the input of which is connected to the output of the pulse generator, and to the output of the key, the frequency synthesizer connected in series, the input of which is connected to the output of the pulse generator, is a block frequency controllers and a monitoring time generator connected in series with a sensitivity measuring unit, the first input of which is the output of a superheterodyne radio receiver being monitored, an analog-to-digital converter, a switching unit whose control input is connected to the RS trigger output and the pulse generator input, and a threshold block, a shift register, the output of which is connected to the first input of the deciding unit, the second input and the output of which are connected respectively with the second output of the switching unit and the first input the first key, the second input of which is connected respectively to the output of the frequency synthesizer and the input of the recording unit, the output of the input signal simulator, which is the information input of the superheterodyne radio receiver being monitored, is connected to the second input of the sensitivity measuring unit, the polling input of which is connected to the clock input of the shift register and connected to the output of the control time driver, the output of the threshold block is connected to the R-input of the shift register and the first input of the second key, the second input of which is etsya control input devices, output adjustment unit connected to the input frequency of the input signal of the simulator and connected to the control input of the controlled superheterodyne radio receiver, shifting the input shift register is connected to the second output of the switching unit.