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安装和维护的测试要求,基本类似但稍有不同。 Both baseline return loss and DTF measurements should be taken when conducting line sweeps. It is recommended to take baseline data with a wide frequency span and with a narrow frequency span (usually the antenna bandwidth). A wide frequency sweep is recommended to find connector and cable problems. Sweeping frequencies higher than the antenna makes problem areas easier to find. Using the wide frequency sweep a pin gap problem can be seen on the Site Master DTF plot. Note that the pin gap does not appear in the return loss plot. However, on the DTF plot marker M1 changes to 26.70 dB from the 36.97 dB on the baseline plot. Using the wide frequency sweep a dent in the cable can be seen on the Site Master DTF plot. The problem is not apparent in the return loss plot. Movements in an antenna can detected with DTF if the antenna is near other metal objects. As shown, the shape of the DTF plot beyond the antenna has changed because of a change in the back scatter pattern. This resulted from moving the antenna relative to some metal objects around it. When the position of a sector antenna is altered by heavy winds, the base stations signal propagation pattern is impaired. In this case the return loss was also affected by moving the antenna closer to some metal objects. Site Master Software Tools allows quick comparison of “before” and “after” DTF measurements. Recent data is compared to a historical PC database record, which is usually recorded during site installation/commissioning. Site Master Software Tools is Windows based. Graphs can “Drag-n-Drop” onto each other. Key Concept: Comparing “Signatures” Each cable/antenna tends to have a unique Distance-To-Fault (DTF) “Signature” because differing cable electrical lengths, cable types, dielectric thickness variations, and the position of components (connectors, adapters, and lightning arrestors) will cause different reflections at differing positions in the transmission line. Re
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