SU907828A2 - Device for monitoring sensitivity of supplementary channels in radio receivers - Google Patents

Description

one

The invention relates to a radio measuring technique and can be used to automatically control the sensitivity of side channels in radio receivers.

According to the main auth. W knows 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 a radio receiver whose output is connected to one input of the amplitude comparator, to another input of which the reference signal former is connected, the indicator , serially connected start pulse shaper, first trigger, second trigger and decrypt, to the other inputs of which other outputs of the first t are connected rigger, and two elements of the match, with the first and second outputs of the decoder

connected to the first inputs of the corresponding first and second elements of coincidence; to the second inputs of which the output of the signal generator is connected, the outputs of the first and second elements of coincidence are connected respectively to the Failure and Indicator inputs, to the input of which is not the third output of the decoder, which

The to is connected to the input of the control unit, and the input of each of the illuminated panels is connected to the corresponding input of the indicator Fault Normal and Not normal 1.

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However, the known device has low accuracy.

The purpose of the invention is to improve accuracy.

To achieve this goal, a device for controlling the sensitivity of side channels in radio receivers was introduced;

neither adjustment pulses and a differentiation unit connected in series, an additional trigger and a counter; the input of the differentiation unit and the input of the tuning pulse shaping unit are combined and connected to the output of the amplitude comparator; the output of the tuning impulse forming unit is connected to the second input of the control unit, the first input of which is connected to the third output of the decoder through the clock generator, the output of which is connected to another input of the counter.

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

The device for monitoring the sensitivity of side channels in radio receivers contains a control block 1, a signal generator 2, a radio receiver 3, an amplitude comparator 4, a reference signal shaper 5, an indicator 6, a trigger pulse shaper 7, the first 8 and agora 9 triggers, a decoder 10, the first 11 and the second 12 elements match, an additional trigger .13, counter 1, differentiation unit 15, adjustment tuning pulse generation unit 16, clock pulse generator 17, the indicator consisting of three light displays Fault 18, Normal 19 and Not the norm 20.

The device works as follows.

The frequency of the signal generator 2 is set to the upper limit of the control range. The input of the radio receiver 3 is given a level signal X, which is equal to a given norm, which generates a signal Y at the radio receiver output, which is then compared with the level of the reference signal generated by the shaper 5 of the reference signal. The control unit 1 performs a smooth change in the frequency of the generator of 2 signals in a controlled frequency range. If there are no reception channels (radio failure) at the output of the amplitude comparator C, the differential signal (will be negative () in the controlled frequency range, the tuning pulse shaping unit 16 will be locked, which ensures a smooth operation

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control unit 1, the trigger pulse shaper 7 will also be locked and from its output no pulse arrives at the first trigger, which provides the initial 6 state for both triggers, unit 15 generates a zeroing signal and the counter C shows zero.

10 are in the following states x v, 0,. 0, At the end of the monitoring range, at the frequency f, the output of the generator 2 signals, the voltage U is applied to the matching elements.

from the limit switch contact of the signal generator. First element

11 coincidence is triggered by turning on the indicator 6, on the light panel 18 of which the Fault signal is displayed. In the presence of receiving channels and matching the frequency of the generator 2 signals with the boundary frequency of the receiving channel at the output of the amplitude comparator 4, a positive signal DY O is generated, which, arriving at the trigger generator 7, generates a single pointed pulse, arriving at block 13 produces a signal using the additional trigger 13, it starts the counter I, and thus arrives at block 16, translates the block

1 control to discrete mode, providing generator tuning

2 signals on the signals of the generator 17 with a step generated by the block 16, inversely proportional to the value of DY.

Upon reaching the frequency of the generator 2 signals the value of the other boundary frequency of the receiving channel, the value of DY becomes less than zero, the start pulse generator 7 and the block 16 become locked, the control unit 1 goes into smooth mode, the block 15 generates a reset signal, and the additional trigger 13 translates the counter 1 4 in the initial state. The meter readings will quantitatively characterize the sensitivity and bandwidth (integral characteristic) of this radio receiver reception channel.

If there is one (main) reception channel, the pulse of a pointed shape, produced by the shaper 7 of the start pulse, re-triggers triggers 8 and 9 from state 1

1 to the state O, 1. At the same time, at the output of the decoder 10 U, 0 ,, and, 0. At the end of the monitoring range, from the output of the generator 2 signals, voltage is applied to the coincidence elements, the second matching element is triggered by turning on the indicator 6, on the light hablo 19 of which the signal Norma

If there is a side reception channel (besides the main one), the pulse of a pointed form is generated by the shaper 7 of the start pulse twice, as a result, the 8 w 9 triggers from the initial state 1, 1 are switched to the 1, O state and the output of the decoder 10 has the voltage , On the light panel 20 of the indicator 6, the Ke signal is displayed, the norm, the generator 17 generates a signal that blocks the transfer of the control unit 1 to a smooth mode and causes it to stop when the block 16 is locked.

Thus, the proposed device, in comparison with the known, provides automatic search and examination of side reception channels, quantifies the integral characteristic of each channel, which allows separating the main reception channel, quantitatively compare the channels

side and main reception, i.e. get a more complete and qualitative assessment of the sensitivity of the radio,

Claims (1)

Invention Formula A device for controlling the sensitivity of side channels in radio receivers according to author. H, which is due to the fact that, in order to increase accuracy, a clock generator, a tuning pulse shaping unit, and a successively connected differentiation unit, an additional trigger and a counter are introduced, while the input of the differentiation unit and the tuning pulse generation unit input are combined and connected to output of the amplitude comparator, the output of the tuning pulse shaping unit is connected to the second input of the control unit, the first input of which is connected to the third output of the decoder via a generator clock pulses, the output of which is connected to another input of the counter. Sources of information taken into account in the examination 1. USSR author's certificate, tf, cl. And Oh In 17/00, 1978.