Why should be test Low PIM for RF feeder cable ?
In general, RF feeder cable is subject to test low PIM performance. In high-power or high frequency systems, these passive components generate higher RF frequencies relative to the operating frequency. These RF waves are mixed with the operating frequency to produce a specific set of frequencies. The end result is a set of useless spectrum in the air that affects normal communications. All passive components generate inter modulation distortion, and passive inter modulation occurs for many reasons, such as unreliable mechanical contact, solder joints, and surface oxidation. so RF feeder cable have to test low PIM.
IMD / PIM is a distorted signal produced by the mixing of two or more different frequency signals into a passive device due to the nonlinearity of the connection point or material. The generation of interference is related to the local downlink frequency, which can lead to an increase in uplink frequency noise when multiple systems share infrastructure. The impact of PIM on network quality is very serious, especially for broadband antenna systems. PIM interference can result in reduced receiver sensitivity, increased access failure rates, reduced transmission rates, and reduced system coverage and capacity. so RF feeder cable have to test low PIM.
Any component in the RF system have PIM interference, including antennas, duplexers, lightning arresters, coaxial cables, and RF connectors. In addition, when the antenna system is radiated with high power, loose mechanical connections and rusted surfaces can also cause PIM interference. so RF feeder cable have to test low PIM.
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