SU808984A1 - Automatic meter of uhf channel parameters - Google Patents

Description

I

 The invention relates to a radio metering technique and can be used to automatically measure the attenuation of a quadrupole in the microwave range.

A device for measuring amplitude and phase-frequency characteristics, containing frequency converters, a system measuring the relative value of a given parameter, an adjustable electronic phase-shifting device, a oscillating frequency generator supplying a signal to two channels, a local oscillator, a phase-shifting device adjustable in a wide range , phase multiplier type 1.

However, this device has a significant disadvantage, which does not allow it to measure the coefficient of attenuation with sufficient accuracy during a panoramic measurement.

Also known is an automatic meter for the parameters of the superhigh-frequency paths, which contains two directional couplers: between which the studied microwave path is included, a sweep generator, connected to the first directional coupler and the display indicator, and the first and second detectors connected respectively at the outputs of the first and second directional couplers (2.

However, the known device has a low resolution and measurement accuracy.

The purpose of the invention is to increase the resolution and accuracy.

Claims (2)

This goal is achieved by the fact that the automatic meter of parameters of the superhigh-frequency paths, containing two directional couplers, between which the studied superhigh-frequency path is included, a sweep generator connected to the first directional coupler and the display indicator, and the first and second detectors, turned on at the outputs of the first and the second directional couplers, between the output of the second detector and the input of the xsshographic indicator, the first connector is successively introduced. A torch repeater compensating an attenuator, a subtraction unit and a matching unit; the second input of the subtraction unit is connected through the input of the second emitter repeater to the output of the first detector and the third input of the oscillographic indicator. The drawing shows a structural electrical circuit of an automatic meter of parameters of the microwave paths. The automatic meter contains a generator 1, the first directional coupler 2, the microwave path 3 under investigation, the second directional coupler 4, the first 5 and second 6 detectors, the oscillographic indicator 7, the first emitter follower 8, the compensating attenuator 9, the subtraction unit 10, the matching unit 11, the second emitter follower 12. At the second output of the second directional coupler 4, a matched terminal load 13 is turned on. The automatic extractor of the parameters of the microwave paths works as follows. From the sweep generator I, a high frequency signal with a varying frequency in the sweep band and stable output power in a given frequency range is fed to the first directional coupler 2, from which its output signal for the test is transmitted to the subtraction unit 10 sequentially. the second directional coupler 4, the second detector 6, the first emitter follower 8, the compensating attenuator 9, and from the second output of the first directional coupler 2 to the subtraction unit 10 through the first detector 5 and the swarm emitter follower 12 is supplied supports ny signal. The output difference 1 1 sigal from the subtractor unit 10 through matching unit II is fed to the measurement input of the oscillographic indicator 7. At the same time, the reference signal from the first detector 5 through the oscillographic indicator 7 is fed to the sweep generator 1 to stabilize the microwave power. The matched final load 13, connected to the second output of the second directional coupler 4, is used as an end absorbing element. If the first 2 and second 4 and directional couplers are connected directly to the subtraction unit 10 through the compensating attenuator 9 and the first 8 and second 12 emitter followers receive the same incident and reflected wave signals. At the same time, the emitter followers 8 and 12 provide the possibility of setting the same signal levels of the incident and reflected waves arriving at the calculating unit 44 of the tube 10. The calibration line is fixed on the screen of the cathode-ray tube of the oscillographic indicator 7. Then, between the first 2 and second 4 directional couplers turn on the microwave path 3 under investigation. Using a compensating attenuator 9, align the line of the device under measurement with the calibration line and determine the attenuation coefficient in the frequency band of the microwave path 3 under study at the compensator attenuator 9. At the same time, the difference signal The output of the subtractor 10 and observed on the screen of the oscillographic indicator 7, is measured by a compensating attenuator 9, which allows to increase the measurement accuracy to + 0.05 dB, i.e. much better than the famous panoramic CWS meters. Using the proposed automatic meter of the parameters of the microwave paths, the laboriousness of the measurement dramatically decreases, the resolution and accuracy of measurements increase (the attenuation coefficients of 0.1–0.5 dB are measured with an accuracy of 0.05 dB while retaining the advantages of the panoramic measurement). Claims of the Invention Automatic meter of parameters of the superhigh-frequency paths, comprising two directional couplers, between which the microwave frequency path under study is included, a sweep generator connected to the first directional coupler and the oscillographic indicator, and the first and second detectors connected respectively to the outputs of the first and second directional couplers, characterized in that, in order to improve resolution and accuracy, between the output of the second detector and the input llograficheskogo indicator successively introduced first repeater zmitterny compensating attenuator and subtractor block matching unit, the second input of the subtractor is connected via a second emitter follower inputted with output of the first detector and the third input osshishograficheskogo indicator. Sources of information received in; Aimiae during examination 1. UK patent N "1490850, class, O 1 and published. 1977. 2. USSR author's certificate number 433426, cl. 6 01 R 27/28, 1972 (prototype). fj - ten "