SU1394442A2 - Device for checking serviceability of superheterodyne receiver - Google Patents

Abstract

This invention relates to a radio technique. The purpose of the invention is to increase the reliability of the control. To achieve the goal, an additional delay element (EZ) 13, filter 14, threshold unit (PB) 15, indicator 16, as well as multiplier (P) 12, key 17, and OR 18 element are introduced into the device. superheterodyne receiver 19 is received by threshold block 10 when comparing the response of filter 9 to a predetermined threshold. The result is displayed on indicator 11. In addition, the RF path is checked after the first frequency conversion by multiplying in P 12 the control signal from the output of amplifier 23 and the undistorted signal from the output of mixer 4 of simulator 1, and then accumulating this result in filter 14, based on of which PB 15, by comparing it with the established threshold, makes a decision on the operability of this path and gives it to the indicator 16 to illuminate. 1 Il. (L

Description

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The invention relates to a radio communication technique, can be used in various radiotelephone and radiotelegraph communication systems for monitoring the high-frequency path of superheterodyne receivers in standby mode and is an improvement of the device according to auth. No. 932632

The purpose of the invention is to increase the credibility of the control.

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

Device for monitoring padoTocno- js at the second intermediate frequency. From the superheterodyne acceptance and output of the balanced demodulator 8, the ka contains a simulator 1, the input signal of the filter 9 is fed to a reconditioned generator consisting of intermediate frequency 2, a balanced modulator 3, the first 4 and second 5 mixers, a control signal generator 6, element 7 delays, balanced demodulator 8, filter 9, threshold unit 10, indicator 11, multiplier 12, additional delay element 13, additional filter 14, additional threshold unit 15, additional indicator 16, key 17, and element OR 18. Control The superheterodyne receiver 19 is composed of a first local oscillator 20, a high frequency amplifier 21, a first mixer 22, a first intermediate frequency amplifier 23, a second mixer 24, and

Lena is a pseudo-random sequence. To the second input of filter 9 through

20, a delay element 7 is supplied with an undistorted pseudo-random sequence from generator 6. The decision on the state of the monitored superheterodyne receiver 19 is made by a threshold unit 10 when comparing the response of the filter 9 with a predetermined threshold. The result is displayed on the indicator 11.

In addition, there is a check.

30 high frequency path after the first frequency conversion by multiplying in the multiplier 12 the control signal from the output of the amplifier 23

and undistorted control signal

second local oscillator 25, the amplifier 26 second, from the output of the mixer 4 of the simulator 1, pro-intermediate frequency and the detector 27. passed through an additional element

The device operates as follows, 13, and then the accumulation of this result.ta in the additional filter 14, on

The control signal, which is based on which the additional corneal block 15, an additional modulated pseudo-random pseudo-Q., receives a carrier by comparing a sinusoidal sequence with a set threshold. , in which with the help of transducers, the spectrum of the controlled signal generated by generator 6 is transferred to the tuning frequency produced by generator 2 of simulator 1, which then served

the decision on the performance of this path and gives it to highlight the additional indicator 16.

If the additional threshold unit 15 makes a decision about the inoperability of the first frequency conversion path, then a check occurs,, as the health of the second path

to the input of a controlled superheter-frequency conversion. At the same time, the receiver is received 19. The signal gives a signal of inoperability to the input of the amplifier 21 of the superheterodyne detector 19 being monitored and then passes through the first mixer ..

22, to the second input of which a switch 17 is supplied, as a result of which the output signal from the output of the first local oscillator 20 of the mixer 4 of the simulator 1 is fed through an additional amplifier 23. The amplified

additional indicator 16, an additional threshold unit 15 provides an opening enable signal

1Buil element 13 delay, key 17

the signal through the element OR 18 is connected, and the element OR 18 is connected to the input | To the input of the second mixer 24, to the second input of which a signal is output from the second local oscillator 25, and then amplified in the amplifier 26. From the output of the amplifier 26, the signal goes to the input of the detector 27.

The control signal, which carries information about the state of the high-frequency path from the output of amplifier 26 of supervised superheterodyne receiver 19, arrives at the first input of a balanced demodulator 8, to the second input of which an unmodulated pseudo-random sequence is fed. To the second input of filter 9 through

The delay element 7 is supplied with an undistorted pseudo-random sequence from generator 6. The decision on the state of the monitored superheterodyne receiver 19 is made by the threshold unit 10 when comparing the response of the filter 9 with the predetermined threshold. The result is displayed on the indicator 11.

In addition, there is a check.

high frequency path after the first frequency conversion by multiplying in the multiplier 12 the control signal from the output of the amplifier 23

the basis of which an additional horny block 15, by comparison with the established threshold, takes

the decision on the performance of this path and gives it to highlight the additional indicator 16.

frequency conversion. Simultaneously with the signal about the inoperable- ..

key 17, resulting in the output of the mixer 4 of the simulator 1 through the additional

additional indicator 16, an additional threshold unit 15 provides an opening enable signal

key 17, resulting in the output of the mixer 4 of the simulator 1 through the additional

1Buil element 13 delay, key 17

do the second mixer 24 controlled superheterodyne receiver 19.

Claims (1)

Invention Formula Device for monitoring the performance of a superheterodyne receiver by aut. St. No. 932632, characterized in that, in order to increase the reliability of the control, an additional delay element is connected in series, the input of which is connected to the additional output of the input signal simulator, the multiplier, the second input of which is connected to the additional output of the superheterodyne receiver being monitored, an additional filter , an additional threshold unit and an additional indicator, a key whose information and control platoons are connected respectively to the output of an additional element for and the output of the additional threshold unit, the output of the amplifier of the first intermediate frequency of the superheterodyne receiver being monitored is connected to the input of the second mixer of the monitored superheterodyne receiver via the input element OR, the second input of which is connected to the output of the key.