RU1775862C - Communication channel frequency-response analyzer - Google Patents

Abstract

Usage: electric communication. SUMMARY OF THE INVENTION: h switching units (), 1 switch (2) of type of operation, 1 amplifier (3) and 1 time selector (4). 1i-42-3-11, 12-4 „: .. 1p-4. 11-21 „-2. 2-1121P, 3-123-1P. 1 ill.

Description

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The invention relates to telecommunications and can be used in instrumentation and in dispatching and technological control systems of power systems.

The purpose of the invention is to improve measurement accuracy.

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

A device for measuring the frequency characteristics of communication channels comprises switching units 1 according to the number of measured communication channels, an operation switch 2, an amplifier 3, and a time selector 4.

The device operates as follows.

By dialing a certain number on the communication channel, the device is connected to a specific channel, after which the switching unit 1 is activated, for example, the riepsoro channel and connects a switch of the 2nd kind of work. By another output, the switching unit 1 includes a time selector 4, which connects the first communication channel to the amplifier 3 with stabilization of the output power for a given time. At the same time, the control frequency is applied to the input of the first communication channel from a service point (not shown in the drawing). At the output of amplifier 3 with stabilization of the output power, the level of this frequency is maintained constant and equal to minus 1.5 Np. This signal is supplied through the switching unit 1 in the reverse direction of the first communication channel. At the service point, the level of the receiving signal P2 is fixed. In each case, the operator (or computer), on the level indicator, fixes two values of the return signal level PI and PZ, and if the normalized level Pi of the receiving signal is taken on the instrument scale as zero, then the deviation of the residual attenuation in the forward direction (Pa) can be

calibrate directly in the deviation of the residual attenuation (if the residual attenuation of the reverse direction is normalized and constant),

those. no computation required. The receiving level PI and P2 of the control signal is changed periodically by a time selector 4 with such a time delay so that the operator (or computer) can fix its value.

By varying the frequency of the oscillators on the operator side, in a similar manner, the frequency response of the communication channel in both directions of transmission at any frequencies of the communication channel can be measured. Similarly, by dialing

of a certain number, any channel is connected to the device for measuring the frequency response of the channels and the characteristic is measured.

Claims (1)

Claims A device for measuring the frequency characteristics of communication channels, comprising, at a serviced amplification point, a control signal generator and a pointer level at a maintenance-free amplification point - an amplifier and a switch of the kind of work, characterized in that, in order to increase the accuracy of measurements, they are introduced on a maintenance-free amplification paragraph time selector and switching blocks according to the number of measured communication channels, while the first station outputs of switching blocks, linear inputs and outputs of which are connected to outputs and inputs the corresponding measured communication channels are connected to the input of the time selector, the output of which through the series-connected switch of the kind of work and the amplifier is connected to the first station inputs of the switching units, the second station outputs and second station inputs of which are connected respectively to the second input and the second output of the switch of type of work .