SU1241500A2 - Device for monitoring amplitude-frequency characteristics of communication channels - Google Patents

Abstract

The invention relates to a technique of radio measurements and is an improvement of the invention according to the author. No. 1059683A. It expands the functional capabilities of the device by ensuring the control of the standing wave ratio (CWS) of the antenna-waveguide path. The device contains a oscillating frequency generator 1, two splitters 2 and 8, a variable attenuator 4, two directional couplers (BUT) 5 and 7, an indicator 6, a mixer 9, a band-pass filter 10, two detectors 11 and 15, a threshold unit 12, a driver (F ) control pulses 13, switch 14, controlled channel 16, antenna-waveguide path. The goal is achieved by introducing Φ 19 rectangular pulses of frequency divider 20, switch 17, H018. Ф 19 forms rectangular impulses of positive polarity from the sawtooth voltage, generated by generator 1. These pulses control the frequency divider 20, which controls the operation of the switch 17. The switch 17 connects all the blocks once to control the frequency response of the communication channels (as in the prototype device), etc., once they connect the NO 18, which controls KSB. 1 il. JV INJ

Description

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The invention relates to a technique of radio measurements and can be used to control the standing wave ratio of an antenna-waveguide path simultaneously with the amplitude control. The frequency response of low-noise amplifiers in multichannel radio communication systems is additional to the main auth.w. No. 1059683A.

The purpose of the invention is to expand the functionality by providing control of the standing wave ratio of the antenna-waveguide path.

The drawing shows a block diagram of a device for continuously monitoring the amplitude-frequency characteristics of communication channels.

The device contains a oscillating frequency generator 1, a first splitter 2, a switch 3, a variable attenuator 4, a first directional coupler 5, an indicator 6, a second directional coupler 7, a second splitter 8, a mixer 9, a band-pass filter 10, the first detector 11, a threshold unit 12, a driver for controlling pulses 13, a switch 14, a second detector 15, a controlled channel 16, an additional switch 17, an additional directional coupler 18, a square pulse driver 19, a frequency divider 20 and an antenna-waveguide path 21.

The device works as follows.

Shaper 19 square-wave pulses form rectangular pulses of positive polarity from the saw-tooth voltage supplied from the oscillating frequency generator 1. These pulses control the frequency divider 20, which is a counting trigger that controls the operation of the additional switch 17. At the same time, the additional switch 17 connects all the units of the device once in the same way as in the prototype device (to control the amplitude-frequency characteristic communication channels). Another time, the additional switch 17 connects an additional directional coupler 18, with which the standing wave ratio of the antenna-waveguide path is monitored. This is done next.

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Razim. From the oscillator 1 of the oscillating frequency, the signal goes to the first splitter 2, from the first output of which a part of the signal goes

5 to key 3. If key 3 is closed, the signal goes through a variable attenuator 4, through an additional switch 17 to the input of an additional directional coupler 18, to the other input of which the antenna-waveguide path 21 is connected through the first directional coupler 5. The signal containing information about the standing wave ratio of the antenna-wave 5 of the water path 21, comes from the output of the additional directional coupler 18 through the controlled channel 16, through the second directional coupler 7 to the second splitter

 8. Part of the signal power from the second output of the second splitter 8 is fed to the second input of the mixer 9, the first input of which receives a signal from the first splitter 2.

5 Due to the fact that both inputs of the mixer 9 receive signals of the same frequency, at its output there is only a component of zero frequency that does not pass through the band pass

30 filter 10. Consequently, there are no signals at the output of the first detector 11, the threshold unit 12 and the driver 13 of the control pulses in series with the first. Key 3 and

35, the switch 14 control voltage is not received. The key 3 is then closed and the test signal passes through it, and the switch 14 connects the first output of the second 40 of the branch 8 to the second detector 15. From the output of the second detector 15, the detected signal passes to the second input of the indicator 6, the first input of which receives the control

45 signal from the first output of the oscillating frequency generator 1. As a result, a curve is drawn on the screen of the indicator 6, the absolute level of which in the point of a point characterizes the coefficient of standing wave of the antenna-waveguide path 21.

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Claims (1)

Invention Formula A device for continuous monitoring of the amplitude-frequency characteristics of communication channels by auth.St. No. 1059683A. Invention Formula A device for continuous monitoring of the amplitude-frequency characteristics of communication channels by auth.St. No. 1059683A. .one characterized in that, in order to extend the functionality by providing control of the standing wave ratio of the antenna-waveguide path, sequentially connected square pulse shaper are inputted, the input of which is connected to the first output of a swept frequency generator, a frequency divider, Editor A. Dolinich Compiled by V. Kamal Gin Tehred L.Oleynik Proofreader A. T hide 3615/57 Circulation 624 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 415004 a mutator, the second input of which is connected to the output of the variable attenuator, and an additional directional coupler, the second input of which 5 is connected to the output of the first directional coupler, the input of which is connected to the second output of the additional switch, the output of the additional directional coupler 10 is connected to a monitored channel.