National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Automatic Antenna Tuner
Šváb, Jaroslav ; Lukeš, Zbyněk (referee) ; Šebesta, Jiří (advisor)
This degree work deals with the design and implementation of an automatic antenna tuner for short-wave transmitters. The device works within the short-wave range in (1.5 MHz - 30 MHz) band according to the selection of the given frequency. Its principle is that the tuner has a small range of adapted impedances, but it is usually sufficient for fine tuning of most deviations in the system of antenna 50 - feeder 50 - transceiver outlet 50 . It is also equipped with memories which the settings for the individual bands or frequency segments are stored into. Then the transition from one band to another is quick, easy and, first of all, safe, which is a great advantage. In automatic mode, a SWR limit from which the tuner should start to tune can be set. Interconnection with a TRX is not necessary in a fully automatic mode, the device tunes automatically after keying if the set limit of SWR has been exceeded. The automatic tuning is very quick with this device, if the antenna being tuned is not stored in the memory the tuning lasts ca 0.5 - 6 s, if the tuner uses the memory. It could be said that the work with the tuner is without problems, it is possible to learn to control it in a short time. The tuner is small and light. The result of the whole project is a compact device controlled by the user by means of push buttons.
System for remote measuring and data storing in central database
Šváb, Jaroslav ; Pust, Radim (referee) ; Šebela, Radek (advisor)
This Master´s thesis deals with the design and implementation of System for remote measuring and data storing in central databese. The system consists of server, which collects data and clients that send data to the server. On the server is installed program Apache in which runs utility script for collecting and evaluating data, written in PHP. Data are stored in MySQL relational database and can be clearly displayed. The client consists of microcontroller ATmega16, which evaluates data from sensors. These data are then transferred via Ethernet using the HTTP protocol through the module XPort.

See also: similar author names
1 ŠVÁB, Jindřich
1 Šváb, Jakub
3 Šváb, Jan
2 Šváb, Jiří
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