Device for monitoring the health of a superheterodyne receiver

 

(57) Abstract:

Use: to monitor the health of receiving devices. The inventive device includes imitator 1 input, superheterodyne receiver 2, the control signal generator 9, a block comparison 11, the indicator 14. Imitator 1 includes: an element isolation 4, a mixer 5 and the modulator 6, the first intermediate frequency. This goal is achieved due to the fact that for the transfer spectralanalysis signal at the frequency of the radiated receiver is used in the input circuit of mixer power level. 1 Il.

The invention relates to electrical engineering and can be used to monitor the health of receiving devices.

A device to monitor the health superheterodyne receiver and. C. the USSR N 567209, CL H 04 B 1/06 containing a phase modulator connected between the local oscillator and mixer simulator input signal, the generator control signal, indicator, filter control signal and the detector.

A disadvantage of this device is the principle of signal input frequency receiver. Simulator input made structurally independently researched the x in the control parameters, degrades the reliability of the device as a whole and complicates its design.

Closest to the proposed invention is a device for monitoring the health of a superheterodyne receiver, containing the simulator input signal, the generator control signal, a delay element, filter, balanced demodulator, the first output of the simulator input signal, the second output of which is connected to the input of a superheterodyne receiver, connected in series through beam demodulator, a second input connected to the output of the second amplifier intermediate frequency superheterodyne receiver, and the filter is connected to the input of the threshold unit, the generator output control signal, in the form of a pseudorandom sequence generator, connected to the first input of the simulator input signal and to the input of delay elements, the output of which is connected to the second input of the filter, and the simulator input signal, the second and the third input of which is connected to the output of the first and second local oscillators superheterodyne receiver, made in the form of series-connected generator intermediate frequency, a balanced modulator and the first and second will smusic the first and second inputs and first and third inputs of the simulator input.

A disadvantage of this device is the principle of spectrum shift control signal to the tuning frequency of the receiver by double conversion, reducing the accuracy of the control due to the presence of combination frequencies in the spectrum of the signal, the presence of the power divider of the local oscillators of the receiver, which leads to the complexity of the design and the necessity of increasing the capacity of local oscillators.

The purpose of the invention is to improve the accuracy of control and simplifying the design.

This objective is achieved in that in the path superheterodyne receiver between the amplifier's high frequency and the first mixer is enabled simulator input signal consisting of a decoupling device, the first and the second input of which is connected to the output of the amplifier high frequency and the input of the mixer of a receiver, a modulator of the 1st intermediate frequency, the output of which is connected to the input of the mixer, the second output of which is connected to the third input of the isolation device, and the output connected to the input of the amplifier high-frequency oscillator control signal, the output of which is connected to the input of the modulator of the 1st intermediate frequency and the input unit of comparison, to the other input of which is supplied with the low-frequency amplifier perenosa spectrum control signal to the frequency setting unit is radiated in the input circuit of the mixer lo power (Cry With. M. Design of microwave devices for radar receivers. M : Owls. radio, 1973 ). Use as a useful signal that leaks to the input of the mixer lo power is unknown.

The reference signal in the simulator included in the tract superheterodyne receiver between the amplifier's high frequency and mixer improves the accuracy of control by eliminating double frequency conversion control signal, leads to simplification of the structure of the control device due to the absence of the two mixers and two power divider oscillators, and does not require an additional power increase of the local oscillators of the receiver. This inclusion of the simulator in the circuit of the superheterodyne receiver in the known solutions are not used, therefore, the proposed device meets the criterion of "substantial differences".

The drawing shows a structural electrical circuit of the device, which contains: simulator 1 input, superheterodyne receiver 2, the amplifier high frequency 3; the element isolation 4, a mixer 5, a modulator 6, the first intermediate frequency. The first mixer 7 and the local oscillator 8, the generator 9 of the control signal, the first amplifier 10 intermediate chats, the demodulator 16 and the amplifier 17 low frequency. Blocks 4, 5, 6 constitute the simulator 1 of the input signal. Blocks 3, 7, 8, 10, 12, 13, 15, 16, 17 make superheterodyne receiver. The element isolation 4 has input 1, input-output II output III.

The device operates as follows.

Control signal representing a first intermediate carrier frequency, modulated by a low frequency generator 9 of the control signal from the output of the modulator 6 is fed to the input of the mixer 5, the second input is from the output of the third circulator 4 comes seeping to the input of the first mixer 7 receiver power of the first local oscillator 8. In the mixer 5 simulator input signal I is the spectrum shift control signal to the tuning frequency of the receiver.

Control signal carrying information on the performance of the receiver is fed to the input of amplifier 3 high frequency, where it is the amplification and selection of the mirror receiving channel. With the amplifier output signal is fed to the input 1 of the circulator 4, and input-output II to the input of the first mixer 7, where the first local oscillator 8 converts the signal into a signal of a first intermediate frequency. The amplified signal in the first amplifier sub-signal of the second intermediate frequency, is amplified in the amplifier of the second intermediate frequency 15, demodulated by the demodulator 16 and amplified to the required power output in the low-frequency amplifier 17.

From the output of the low-frequency amplifier 17, the low-frequency signal is supplied to the block comparison 11. To the second input of which receives the low-frequency control signal generator 9.

The decision on the performance of the receiver is taken by the block 11 and the result is displayed on the display 14.

Thus, as can be seen from the above, the proposed device allows to reduce the capacity of the local oscillators of the receiver to improve the accuracy of control, to improve the coordination of the output of the amplifier high frequency to the input of the first mixer, to simplify the design of the simulator, and therefore, increase the reliability of the device by eliminating double frequency conversion control signal. (56) USSR Author's certificate N 932632, CL H 04 B 17/00, 1980.

DEVICE FOR MONITORING the health of a SUPERHETERODYNE RECEIVER that contains one United block comparison and an indicator connected in series generator control signal and the simulator input signal, which contains a mixer, hanging topics that, to improve the accuracy of control and simplification of the device, the generator output reference frequency connected to the first input of the comparison, a second input connected to the output of the amplifier low frequency of the monitored receiver and simulator input typed element junction, one end of which is connected to one input of the mixer, another input connected to the output of the modulator, which is used in the modulator of the first intermediate frequency, the input of which is the input of the simulator input signal, the input element of the junction is connected to one output of the amplifier high frequency of the monitored receiver, and the other output connected to the corresponding input of the corresponding mixer controlled receiver.

 

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