SU1283988A1 - Device for checking serviceability of superheterodyne radio receiver - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve the control accuracy while reducing the influence of the control signal on the signal of the correspondent. The device contains a simulator of 1 input signal. consisting of r-2 intermediate frequency and balanced modulator 3, key 4, two threshold blocks (PB) 5 to 10, r-r 6 control signal, delay delay 7, balanced demodulator 8, filter 9, indicator , 11, superheterodyne radio receiver (HLR) 12, consisting of a high-frequency I3, a mixer 14, a local oscillator 5, an intermediate frequency 16 and a detector 17, a local oscillator 18, and an EL 19 signal. With the appearance of a correspondent signal, it is amplified by at-lem 13 and when a certain threshold of PB 10 is exceeded, through key 4 it stops the receipt of the control signal the input y-16, thereby eliminating the influence of the control signal on the signal of the correspondent. (L

Description

1283988

Monitoring of the RPM 12 13 in this case is carried out by registering the signal of the correspondent in indicator 1 after

the passage of the entire path of reception, the Goal is achieved by the introduction of key 4, PB 10, ln 18, and elekt I 19. I il.

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The invention relates to telecommunications and can be used in various communication systems for monitoring radio receivers.

The purpose of the invention is to increase the control accuracy while reducing the influence of the control signal on the correspondent signal.

The drawing shows a structural electrical circuit of the device for monitoring the health of a suppeperiodine radio receiver ..

The device contains an input signal simulator 1 consisting of series-connected intermediate frequency oscillator 2 and balance. modulator 3, key 4, first threshold unit 5, pilot signal generator 6, delay element 7, balanced demodulator 8, filter 9, second threshold unit 10, indicator 11, superheterodyne radio receiver 12, including high frequency amplifier 13, mixer 14, the local oscillator 15, the intermediate frequency amplifier 16 and the detector 17, the local oscillator signal 18, and the element 19.

The device works as follows.

In the absence of a correspondent signal, the high-frequency part of the radio receiver 12 is controlled by recording the signal of the local oscillator 15, which is present in the receiver antenna, by feedback from the mixer 14 and the high-frequency amplifier 13. The local oscillator signal is picked up by a special additional antenna to the amplifier 18 of the local oscillator signal, which is fed to one input of the And 19 element. The intermediate frequency amplifier 16 is tested using a pilot signal, which is a modulated pseudo-random sequence.

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The intermediate frequency signal that comes from the output of the balanced modulator 3 through the key 4 to the input of the amplifier 16. The control signal carrying information about the condition of the receiver’s intermediate frequency path is fed to one input of the balanced demodulator 8, to the other input of which the unmodulated intermediate the frequency from the output of the balanced demodulator 8 to the input of the filter 9 is fed to the reconstructed pseudo-random sequence. The second input of the filter 9 is supplied with an undistorted pseudo-random sequence from the generator 6. The first threshold unit 5 outputs a signal to the second input of the AND element 19 when comparing the response of the filter 9 with a predetermined threshold. The result of the control is displayed by the element AND 19 on the indicator 11.

When a correspondent signal appears, it is amplified by the high-frequency amplifier 13 and when a certain threshold is exceeded (or satisfies another specified quality) through the second threshold unit 10, by operating the key 4, the control signal stops entering the intermediate-frequency amplifier 16, thereby eliminating the influence n11e control signal to the signal of the correspondent. Monitoring of the radio receiver 12 in this case is carried out by registering the signal of the correspondent in the indicator 11 after passing through the entire reception path.

Claims (1)

Invention Formula A device for monitoring the health of a superheterodyne radio receiver, containing an indicator and a serially connected pilot signal generator, made in the form of a pseudo-random sequence generator, an input signal simulator, a balanced demodulator, the second one, the course of which is connected to the output of the intermediate frequency amplifier of the superheterodyne radio receiver, filter, the second the input of which through the delay element is connected to the output of the control signal generator, and the first threshold unit, and imitating The input signal contains a series-connected intermediate frequency generator and a balanced modulator, the first and second inputs of which are, respectively, the first output and output of the input signal simulator, characterized in that in order to increase the control accuracy while reducing the influence of the control signal on the signal of the correspondent, the series-connected amplifier of the signal of the local oscillator, whose input is the input of the signal of the local oscillator, and the AND element, and the second connected threshold block and key, with E.TOM the output of the balanced modulator is connected to the second key input, the output of which is connected to the input of the intermediate-frequency amplifier of the superheterodyne radio receiver, the output of the high-frequency amplifier and the output of the detector of which are connected respectively to the input of the second threshold unit and the first input of the indicator , the second input of which is connected to the output of the first threshold unit.