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Distance to Fault
K1TTT wrote:
On Nov 3, 6:22 am, ashwanthh wrote: Hi all, For my project, I want to perform Distance to fault measurement in the cable connecting the antenna. The principle is that a signal should be sent to the cable and using the forward and reflected voltage VSWR should be calculated and should be viewed in a spectrum analyzer. My question is 1. What transducer is used to detect the transmitted/reflected signals from the cable? 2. Should the transducer be connected in series or parallel? Anyone, Please help -- ashwanthh look up time domain reflectometers... they are much simpler than what you are thinking of. using a simple step input wave you measure the time to the reflection. if you get fancy you can measure the polarity and size of the reflection to determine if it is a short or open or impedance change... if you really get fancy you can hook a scope up and look at more details. the only transducer needed is a voltage probe OR a current shunt, either one will work depending on the installation needs. Or, use the technique used in vector network analyzers.. Sweep the frequency, do the fourier transform to find time domain. If you're using just power detection, it's more like getting the autocorrelation or power spectrum of the reflected signal vs frequency. |
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