SU640431A1 - Arrangement for checking sensitivity of non-fundamental channels in radio receivers - Google Patents

Description

A device for monitoring the sensitivity of side channels in radio receivers contains a control unit 1, the output of which is connected to the input of the signal generator 2, the output of the latter connected to the input of the radio receiver 3, the output of which is connected to one input of the amplitude comparator 4, to the other input of which the reference signal generator 5 is connected , indicator 6, sequentially connected start driver 7 PMnus trigger, first binary trigger 8, second binary trigger 9 and decoder 10, with other inputs connected to another the two outputs of the first binary trigger, and the two elements /) and 12 matches.

Indicator 6 has three light boards 13-15.

The first and second outputs of the decoder 10 are connected to the first inputs of the corresponding first // and second 12 match elements, the second inputs of which are connected to the generator 2 output, the outputs of the first PI of the second 12 match elements are connected to the inputs Fault and Indicator Norm, Input "Not the norm of which is connected to the third output of the decoder 10, which is connected to the input of the unit / control, for example, a servo drive. The input of each of the light boards 13-15 is connected to the corresponding input of the indicator in “Fault,“ Norm and “Not norm.

The proposed device operates as follows.

The frequency / generator 2 of the j-CTa signals is inserted into the upper limit of the control range /. To the input of the radio receiver 3, a level signal is given equal to the predetermined norm Xa, which generates a signal y at the output of the radio receiver, which is then compared with the level of the reference signal vo generated by the driver 5 of the reference signal. The drying unit 1 controls the smooth change of the frequency of the generator of 2 signals in a controlled frequency range. In this, the following control results may occur.

The case of a malfunction controlled radio.

In this case, at the output of the amplitude comparator 4, the difference signal Ar / g / - g / o will be negative () in the controlled frequency range and the driver 7 of the start pulse will be locked. From its output to the first binary trigger 8, not a single impulse will arrive. Both binary triggers will be in the initial state "1.

In this case, the three outputs of the decoder 10 are in the following states: Ui i O, U2. At the end of the monitoring range, at frequency f, from the output of the signal generator 2, the elements U and 12 of the coincidence receive the voltage U from the contact of the limit switch of the signal generator. The element // match is triggered by turning on the indicator 6, on the light board 13 of which the signal "Fault. Light boards 14 and 15 are not included.

The case of satisfaction of the sensitivity of the side channels of reception of the established norm.

In this case, when the frequency of the generator 2 signals coincides with the frequency of the main channel of the radio receiver, the output of the amplitude comparator 4 produces a positive signal, which, fed to the driver 7 of the start pulse, generates one pointed pulse Us, the transfer of binary triggers 8 and 9 from the state "1 , "1, to the state" O, "1. In this case, the output of the decoder is 10 Ui Us 0, a (. At the end of the control range, at the frequency / i, the voltage U comes from the output of the signal generator to the elements // and 12, the matching element 12 triggers, turning on the indicator 6, on the light panel M the signal "Norm" is displayed. The light boards 13 and 15 are not included, since Li C / 3 0.

The case of dissatisfaction with the sensitivity of the side channels of reception of the established rate.

In this case, at the frequency of the main reception channel and at the frequency of one side channel, the sensitivity of which does not satisfy the established rate (or at frequencies of two side reception channels), a signal is generated twice at the output of the amplitude comparator 4, and two signals are generated at the output of the driver 7 impulse, transferring binary triggers S and P from the initial state "b," 1 to the state "1," o, resulting in a voltage Ui,.

The unit / control is turned off and on the light panel 15 of the indicator 6, the "Not normal" signal is displayed.

Light panels 13 and 14 are not included, as LJi U2.

The proposed device ten times increases the speed and reliability of the control during automatic frequency tuning of the servo signal generator and, in times, with manual frequency tuning.

Claims (2)

Invention Formula A device for monitoring the sensitivity of side channels in radio receivers, containing a control unit, the output of which is connected to the input of the signal generator, the output of the latter is connected to the input of the radio receiver, the output of which is connected to one input of the amplitude comparator, to the other input of which the output of the opformer is connected signal, and an indicator, characterized in that, in order to reduce the monitoring time and increase the control accuracy, the serially connected trigger pulse generator, the first binary trigger, the second binary trigger, the decoder, which other inputs of the first binary trigger are connected to, are entered into it, and two elements of coincidence, the first and second outputs of the decoder are connected to the first inputs of the corresponding, their first and second elements of the match, to the second inputs of which the output of the signal generator is connected the outputs, the first and second elements of the match are connected respectively to the inputs "Fault and" Indicator indicator, to Input "Not the norm of which is connected to the third output of the decoder, which is also connected to the input of the control unit, for example, a servo drive. 2. The device according to claim 1, characterized in that the indicator has three light boards, the input of which is connected to the corresponding input of the indicator "Fault," Norm and "Not norm. The source of information taken into account in the examination: 1. Method of monitoring standards for the levels of spurious emissions of transmitting devices and the sensitivity of channels of side reception of receiving devices of radio-electronic means. M., “Ministry of Defense, 1975, p. 37.