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Automatic antenna analyser
Dufek, Ivo ; Šebesta, Jan (referee) ; Lukeš, Zbyněk (advisor)
This project is dealing with methods of measuring impedances of the antenna systems in the frequency range from the low frequencies to the very high frequencies. There is a discussion about different methods of measuring impedance and each technique is critically evaluated. In terms of this project is compared few types of the professional antenna analyzers. According to this comparison there was made the concept of my own antenna analyzer. There is a detailed description of the design of this device’s important parts including software equipment. Designed instrument has been built and tested.
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Basic methods of reflectometry
Kovář, Ondřej ; Hadinec, Michal (referee) ; Fiala, Pavel (advisor)
This bachelor thesis is focused on physical method called reflectometry and it deals with problem of detection faults in cables and its formatting. This thesis describe the posibility of aplication of this method to a coaxial or an optical cable. Theoretical part of this project is devided in two parts. First part is about a coaxial reflektometry and second part is about an optical reflectometry. Both methods are desribed by block diagrams and even by analysis of real machines. Due to modern devices, we are able to find out in very short time the cable lenght or if the cable is damaged. Because of this ability the reflectometer is very valuable and powerful tool and the research in this technical sector is intesive. Final part of this bachelor thesis inscribe the proposal of laboratorial work, which should introduce the reflectometry to other students.
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SWR and HF power monitor
Gajdušek, Miroslav ; Blansko), (Metra (referee) ; Šebesta, Jiří (advisor)
This work deals with analysis methods continuous measuring systems for measurement standing wave ratio and high frequency power. Reflectometr, provision measuring standing wawe ratio, works in range frequence VHF (145 MHz, 443 MHz), for this width working frequence is used construction reflectometer with directive lead. Measurer HF power works into range 1kW. Further is in work go through problems communications bus for transmission data from unit monitor SWR a HF power into score modulus. With regard to high frequency interference is choice serial communication RS-485 , which is immune against disturbance. Further is designed evaluation unit MASTER, unit SLAVE and modules for measurement power and SWR. In finish is build up the firmware for units.
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Basic methods of reflectometry
Kovář, Ondřej ; Hadinec, Michal (referee) ; Fiala, Pavel (advisor)
This bachelor thesis is focused on physical method called reflectometry and it deals with problem of detection faults in cables and its formatting. This thesis describe the posibility of aplication of this method to a coaxial or an optical cable. Theoretical part of this project is devided in two parts. First part is about a coaxial reflektometry and second part is about an optical reflectometry. Both methods are desribed by block diagrams and even by analysis of real machines. Due to modern devices, we are able to find out in very short time the cable lenght or if the cable is damaged. Because of this ability the reflectometer is very valuable and powerful tool and the research in this technical sector is intesive. Final part of this bachelor thesis inscribe the proposal of laboratorial work, which should introduce the reflectometry to other students.
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SWR and HF power monitor
Gajdušek, Miroslav ; Blansko), (Metra (referee) ; Šebesta, Jiří (advisor)
This work deals with analysis methods continuous measuring systems for measurement standing wave ratio and high frequency power. Reflectometr, provision measuring standing wawe ratio, works in range frequence VHF (145 MHz, 443 MHz), for this width working frequence is used construction reflectometer with directive lead. Measurer HF power works into range 1kW. Further is in work go through problems communications bus for transmission data from unit monitor SWR a HF power into score modulus. With regard to high frequency interference is choice serial communication RS-485 , which is immune against disturbance. Further is designed evaluation unit MASTER, unit SLAVE and modules for measurement power and SWR. In finish is build up the firmware for units.
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|
|
Automatic antenna analyser
Dufek, Ivo ; Šebesta, Jan (referee) ; Lukeš, Zbyněk (advisor)
This project is dealing with methods of measuring impedances of the antenna systems in the frequency range from the low frequencies to the very high frequencies. There is a discussion about different methods of measuring impedance and each technique is critically evaluated. In terms of this project is compared few types of the professional antenna analyzers. According to this comparison there was made the concept of my own antenna analyzer. There is a detailed description of the design of this device’s important parts including software equipment. Designed instrument has been built and tested.
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