SU809604A1 - Device for testing sensitivity of supplementary channels in radio receivers - Google Patents

Description

one

The invention relates to radio engineering and can be used to automatically control the sensitivity of side channels in radio receivers with simultaneous automatic detection and registration of the frequency of side channels that do not meet the specified rate of sensitivity.

According to (main auth. No. 64043.1, there is a device for monitoring the sensitivity of side channels in radio receivers, containing a control unit whose output 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 another the input of which is connected to the driver of the reference signal and the indicator, and the serially connected trigger driver, the first binary trigger, the second binary trigger, the decoder, to others the inputs of which are connected to the other outputs of the first binary trigger, and two elements of the match, while the first and second outputs of the decoder are connected to the first inputs of the corresponding first

and the second match elements, to the second inputs of which the output of the signal generator is connected, the outputs of the first and second match elements are connected, respectively, to the fault inputs, indicator rate, to the input not of which the third output of the decoder is connected, and to the input of the control unit, for example , servo drive. In addition, the indicator has three light boards, the input of each of which is connected to the corresponding indicator input fault,

5 norm and not norm 1.

However, the known device does not provide simultaneous automatic detection and registration of frequencies of side reception channels, not

0 satisfying specified norms.

The purpose of the invention is the simultaneous automatic detection and registration: frequency frequencies of side reception channels that do not satisfy the norm mothers.

To achieve this goal in a device for monitoring the sensitivity of side channels in radio receivers, containing a control unit,

0 output of which is connected to the input

signal generator, the output of the latter is connected to the input of the radio receiver, the output of which is connected to one I input of the amplitude comparator, to (the other input of which is connected to the output of the reference signal conditioner and the indicator, as well as serially connected trigger driver, the first binary trigger, the second binary trigger, decoder, the other inputs of which are connected to the other outputs of the first binary trigger, and two elements of coincidence, while the first and second outputs of the decoder are connected to the first inputs of the corresponding There are first and second match elements, to the second inputs of which the output of the signal generator is connected, the outputs of the first and second match elements are connected respectively to the fault and indicator inputs, to the input of which is not the third output of the decoder, / which is connected to the input of the control unit, for example, a servo drive, and the indicator has three light boards, the input of each of which is connected to the corresponding indicator input fault, normal and not normal to the output of the signal generator The serially connected first key, first counter, divider and indicator recorder are connected to another divider input in series with a reference frequency generator, a second key and a second counter, between the output of the amplitude comparator and the connection point of the other inputs of the first and second counters of the block indicator the control and control inputs of the divider are connected in series with a trigger and a differentiating circuit, with the trigger output connected to other inputs of the first and second keys.

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

The device for controlling the sensitivity of side channels in the radio receivers contains a control block 1, a generator of 2 signals, a radio receiver 3, an amplitude comparator 4, a driver 5 of the reference signal, ind (a trigger b, a driver 7 of a trigger pulse, the first binary trigger 8, the second binary trigger 9, the decoder 10, the first element 11 matches, the second element 12 matches, light boards 12, the first key 14, the first counter 15, the divider 16, the indicator-recorder 17, the generator 18 of the reference frequency, the second key 19, the second counter 20, trigger 21, diff Ferenti control chain 22,

The device works as follows.

using the control unit 1, the generator 2, which has at its output a signal corresponding to the sensitivity standard of the side reception channels of the radio receiver 3 under study, is tuned over a wide frequency range,

In case of a malfunction of the radio receiver 3, the level of the comparator in the amplitude comparator 4 does not exceed and the entire circuit is in the initial state. In this case, one of the inputs of the first element 11 maintains the voltage, and at the end of the tuning range of the generator 2 from the voltage from the limit switch of the generator 2, the first element 11 is triggered, including the light panel 13 indicator b fault,

In the case of a given norm on the sensitivity of the side reception channels, when the generator 2 is rearranged within the passband of the main reception channel at the norm level, the output of amplitude comparator 4 is a positive voltage, which causes the generator 7 to work, which translates binary triggers 8 and 9 from position 1, 1 to position O, 1, which causes a voltage at the output of the decoder 10 to be applied to one of the outputs of the second element 12, resulting in at the end of the tuning range of the generator 2 cf Abat the second element 12, which lights up the light panel 13 indicator 6, In this case, if there is a positive voltage at the output of the amplitude comparator 4, the electronic switches 14 and 19 are opened with the pulse of the trigger 21, through which oscillations of the generator 2 and the generator 18 of the reference frequency arrive at the electronic counters 15 and 20, respectively. The trigger pulse 21 is differentiated by the differentiating circuit 22. Differentiated by a pulse from the trailing edge of the trigger trigger 21, the counting results of the electronic counters 15 and 20 are transmitted to the digital divider 16 and to the digital indicator-recorder 17, and the counters 15 and 20 are returned to the initial state.

The differentiated pulse from the leading edge of the trigger pulse 21 translates the divider 16 and the indicator-recorder 17 into the initial state. In this case, when the norm on the sensitivity of the side reception channels is measured, only the frequency of the main reception channel is measured.

If the norm on sensitivity of the side reception channels is not fulfilled, as a result of the secondary increase of the level of comparing, a positive voltage is present at the corresponding output of the decoder 10, turning off the light panel 13 is not the norm

Claims (1)

Claim A device for monitoring the sensitivity of side channels in radios according to author certificate No. 640431, characterized in that, for the purpose of simultaneous automatic determination and registration of frequencies of side reception channels that do not meet specified standards, the first key is connected in series to the output of the signal generator, the first counter, divider and indicator-recorder, to the other input of the divider are connected in series a reference frequency generator, a second key and a second counter, between the output of the amplitude comparator and oh compound other inputs of the first and second counters, the indicator-recorder, control input unit and a control divider are connected in series and trigger the differentiating circuit, the latch output is connected to the other inputs of the first and second key.