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A simple low-cost digital display system Microwave VSWR


After the data transfer to the display unit, the use of dynamic scanning display. Select the 8155 chip as the MCU external extension I / O port. LED strobe turns sharing. Select the appropriate frequency, the use of digital control with persistence characteristics and inertia of human vision to achieve full digital control system software design also shows two figures standing wave ratio of microwave system design includes a hardware circuit design and software programming the entire system from the two most signal amplification, the analog signal into digital signals, data collection compared to the standing wave ratio was calculated Sheng, and then by the digital output interface circuit will be sent to monitor the results and so on, the realization of all the features are software programmable MCU by the 803i rake control. System software design flow chart shown in Figure 4. Programmable gain amplifier part of the implementation of the eight main control switch files rake 5G405i switch. A switch is set to start first block (maximum magnification file), when the A / D conversion process to the input over-range detection. Then switch to the next file. Control the analog signal until the maximum A / D conversion range range. MC14433 after power, that is, the input voltage signal to external A / D conversion, the EOC is connected with the DU-side, red and gold, etc. 4: A simple low-cost micro-crossing on the spoon VSWR figures show that 69 per conversion system BCB has completed the appropriate code and the corresponding strobe in Q. ~ Q. And DS ~ Ds on. CPU interrupt initialization procedure open to allow external interrupt l interrupt request. Each A / D conversion end. All requests to the CPU interrupt, CPU interrupt, the interrupt service routine. Read A / D conversion results. Data acquisition is the same amplification gain in the case, when the measuring line probe moves within the measuring line. After several adjacent nodal points and antinodes. Continuous acquisition and convert the signal, and then A / D converter to a computer data storage after the appropriate storage unit, and then compare the data calculated the standing wave ratio,[link widoczny dla zalogowanych], the last call display program, the results show display. 3 Conclusion In this paper micro-crossing VSWR figures show the system design. And has been test proven to be entirely feasible. Main program: Comparison of satisfaction with the interrupt service routine. To further enhance the flow chart of Figure 4,[link widoczny dla zalogowanych], system software design process data collection system in the reliability of sampling. Reduce the noise. Need for accurate data processing,[link widoczny dla zalogowanych], digital filter transition process,[link widoczny dla zalogowanych], filter hidden 'signals. Since the system is simple and low cost. The future for a more complete system to meet higher demand. References: lj smart single-chip computer interface and system design Heilongjiang: Harbin Institute of Technology Press, such as a single-chip microcomputer 1995:2 Zhang Youde principle, application and experimental Shanghai: Fudan University Press, 1994:3] and practical Handbook of Practical Electronic Circuits Electronic circuits manual preparation of group t Higher Education Press Beijing. 1991TheMeasurementSystemwithSingle - chipforMicrowaveStanding -, aVJinHongFangHualingFanShumin (Da] ianMaritimeUniversity, Dalianl16026) (ShandongInstituteofTechnology, Zibo255912,[link widoczny dla zalogowanych], China-AbstractAdigitaldisplaysystemwithmicrocontrollerforstanding - waveisdeveloped ・ 1h-'cipleandmethodofsystemdesignisdiscussed. Theinterlacecircuitsdrawbetween8031single-: pandperipheralcircuitsisgiven.Theperipheralcircuitsconsistofamplifierwithprogrammingc.】 T, _A / Dconverteranddigitaldisplayunit.KeyWordsamplificationwithprogrammingcontrol, standing- -waveratio, A / Dconverting

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