SU687606A1 - Device for remote monitoring of intermediate amplifiers - Google Patents

Description

I

This invention relates to a technique for conducting communications.

A device for remote control of intermediate amplifiers is known, which contains a harmonic generator, a level meter, a frequency converter and a key 1 at each end station.

However, this device does not provide the necessary precision control of intermediate amplifiers.

The purpose of the invention is to improve the accuracy of control.

For this purpose, a control unit, a synchronization unit and a pulse shaper were inserted into a device for remote control of intermediate amplifiers containing a harmonic signal generator, a level meter, a frequency converter and a key at each end station, and the output of the control unit through a serially connected synchronization unit and key, second entry

which is connected to the second output of the synchronization unit, connected to the output of the harmonic signal generator and connected to the input of the forward link, and the output of the reverse communication link through the frequency converter, the second input of which is connected to the output of the pulse former, is connected to the input of the level meter.

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

It contains a control unit 1, a synchronization unit 2, a pulse shaper 3, a key 4, a level meter 5 & n, a frequency converter 6, a harmonic signal generator 7.

The device works as follows.

If it is necessary to check the condition of the intermediate amplifier of the undervoltage of the cable trunk, the control device, with its inputs, podklkk to the gross transmission path and 3.6 receiving terminal station. Meter 5 adjusts to the expected frequency of the signal that is to be received from the monitored intermediate amplifier. Upon completion of the adjustment, measure the L 5 command is sent to block 1, which generates a trigger signal and sends it to the input of block 2, Block 2 generates two pulses separated by a certain time interval, and the first pulse from the first output of block 2 is fed to the forwarder 3, and the second, from the second output of block 2, is applied to the second input of key 4; the second pulse produced by block 2 is delayed in relation to the first pulse by half the duration of the linear-frequency-modulated pulse generated shaper 3, In turn, the duration of this last impulse is chosen by a taxi so that it is no less than twice the transit time of the impulse along the highway at both ends. Thus, of the total pulse produced by the shaper 3, only the first half of the pulse is sent to the line (at the entrance of the group transmission path of the completed station); the second half of the key 4 is not skipped. The transmitter 6 receives a full pulse. This ensures that the input pulse meter 5 has the same pulse duration from all the intermediate amplifiers on the communication line. Each of these pulses has its own well-defined filling frequency, which is different for different pulses. By adjusting the tuning frequency of the meter 5, you can measure the level of the signal coming from any intermediate amplifier. In addition to the linear-frequency-modulated pulse, harmonic oscillation from the generator output 7 is continuously applied to the input of the group clock of the device. Thus, in the transmission path, at least two frequencies are present in the transmission path at each current amplifier due to the nonlinearity inherent in the amplifier at least two combination frequencies equal to the sum and differences of the original applied frequencies. One of these combination frequencies, located in the opposite direction of the transmission band, arrives as a signal reflected from this amplifier at the input of converter 6, the frequency of the generator 7, you can check the non-linearity of intermediate amplifiers at different frequencies, not only in the second harmonic, but also check the second and third order combinational distortions. Further expansion of the control capabilities of intermediate amplifiers can be obtained if instead of a single oscillator 7 we connect the outputs of two oscillators tuned to different frequencies, Block 2 generates a series of pulses continuously, which makes it possible to monitor the state of a specific amplifier or any group of amplifiers for as long as desired. The feasibility of a device for remotely monitoring intermediate amplifiers is to improve the accuracy of the control. The formula for the device for remote control of intermediate amplifiers, containing a harmonic signal generator, a level meter, a frequency converter and a key at each end of the station, is different from the fact that, in order to improve the control accuracy, a control unit, a synchronization unit and a pulse shaper were inserted, the output of the control unit is connected via a serially connected synchronization unit, a pulse shaper and a key, the second input of which is connected to the second output of the synchronization unit; with the output of the harmonic signal generator n is connected to the input of the forward communication channel, and the output of the reverse communication channel through a frequency converter, the second input of which is connected to the output of the pulse former, is connected to the input of the level meter. Sources of information taken into account in the examination of 1, Droznes rjvv, and others. Transmission system, Communication Network 1977, cD19121 (prototype).