SU748892A1 - Apparatus for monitoring signal levels in communication channels - Google Patents

Description

The second meter input input of the channel number, the second input and the second output of which are connected respectively to the output of the manual channel selection unit and the control input of the second memory block, and the second and third outputs of the tunable frequency generator are connected respectively to the second input of the first And element and the second input of the second element And, the output of which is connected to the control input of the first memory block.

The drawing shows a structural electrical circuit of the proposed device. A device for monitoring signal levels in communication channels comprises a clock pulse generator G, a controlled channel extraction unit 2, a tunable frequency generator 3, a channel number counter 4, an indication unit 5, a 6 level analyzer, a log amplifier 7, a tuner amplifier 8, a band filter 9, first and second blocks 10, memory I, first and second elements I 12, 13, key 14, level difference meter 15, block 16 for manual channel selection.

The device works as follows.

When the device is put into operation, generator 1 delivers the first pulse to the input of counter 4 and element A and 12, generator 3 of a tunable frequency re-tunes the wideband path to the pilot signal frequency, and signal from the output of element I 12 switches the output of the logarithmic amplifier 7 using a switch 14 to the input of the memory block 10. The level of the pilot signal, allocated by the allocation unit 2 of the local channel after amplification by the log amplifier 7 through the key terminal 14, is measured by the unit 10 of the pilot signal level memory.

When applying the second pulse of the generator 1, the generator 3 of the tunable frequency rebuilds the wideband receiving path to the frequency of the first channel. In the first channel, key 14 returns to another position and connects the output of the logarithmic amplifier 7 to the input of the signal storage unit. The level of the signal in the first channel, allocated by the receiving path, amplified by the logarithmic amplifier 7, is stored by the memory block 11. The levels of the pilot signal and the signal from the outputs of blocks 10 and AND memory pbdyuts to the input of the meter 15 level differences and the analyzer b levels a from the output of the latter in the form of a signal "Normal or Not normal; input to the input of the display unit 5, simultaneously A signal from the output of counter 4 is supplied to its third input. In the case that the signal indication block 5 arrives at the input, the channel number in which the signal level in the channel is less than or greater than the pilot signal level is ignited.

If at subsequent reviews of the trunk in this channel there are situations

Form or Noise, the display of the channel number on the display of the display unit 5 is saved, but if the channel appears to be Norm, then the display of the channel number on the display ceases.

If necessary, regarding the analysis of the signal level in any of the 200 channels, the operator manually dials the required channel number using the manual channel selection block 16, stopping the generator 1, and compares the signal level in the selected channel with the pilot signal level. Then, using a level difference meter 15, it determines the level difference in decaps.

In the proposed device, the accuracy of measuring signal levels is improved by a factor of 2 to 3 compared with known meters. The functionality of the device has been enhanced by the use of block 16 for manually selecting a channel which allows selectively measuring the signal level in any channel. In addition, the proposed device is simpler, more reliable, and cheaper by about 25-30 / o due to the elimination of such complex units as an electronic decade switch and a receive allocation path, a pilot signal.

Claims (1)

Invention Formula A device for monitoring signal levels in communication kaials, containing a clock pulse generator and a controlled channel extraction unit, the control input of which is connected via the tunable frequency generator to the output of the counter channel number and the first input of the display unit, the second and third inputs of which are connected respectively to the first and the second outputs of the level analyzer, characterized in that, in order to increase the accuracy of the control, the logarithmic O and wideband amplifiers, bandpass filter, first and second memory blocks, first and second elements, key, level difference meter and manual channel selection unit, while the output of the wideband amplifier is connected to the signal input of the controlled channel allocation unit through the bandwidth input of which i through a series-connected logarith mnny amplifier, the key and the first memory block is connected to the combined first 0 inputs of the level difference meter and a level analyzer, the combined second inputs of which are connected via the second nawar block to the second output of the key, the control input of which is connected to the output of the first And element, the first input of which is connected to the first input of the second And element, output. clock generator and the first input of the channel number counter, the second input and the second output of which are connected respectively with the output of the manual channel selection block and the control input of the second memory block, and the second and third outputs of the tunable frequency generator are connected respectively to the second input of the first Element And to the second input of the second element And, the output of which is under-; keys to the control input of the first memory block. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 436449, cl. H 04 J 1/16, 1972 (prototype).