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PIM as LTE Brake - not with SPINNER Products


Thursday, April 10, 2014 by SPINNER

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Long term evolution (or LTE for short) provide users with greater bandwidths and even faster access times on mobile networks with new frequencies and improved technology. Many countries are working flat-out to develop their network.

It all sounds good but why is passive inter-modulation now threatening to thwart progress again?

Quite simply: PIM (Passive Intermodulation) can lead to disconnections, dead spots and lower data transfer rates, ultimately negating the technical progress of LTE.

How does PIM develop and what does PIM have to do with LTE?

PIM always develops when at least two different frequencies are transmitted from a passive component, such as a plug or antenna cable. The nonlinearity of the component, as the result of poor design of the component, inaccurate manufacturing, defective materials or shabbily processed surfaces, can cause a disturbing signal to exist in the frequency range of a useful signal.

The more frequencies are transmitted through a shared line, the more disturbing signals can occur. GSM and UMTS are already transmitted through the same cable. With LTE, the probability of disturbing signals increases considerably. If this disturbing signal is in the useful range of a mobile communication frequency, it disrupts the transmission from smartphone to base station. In the worst case scenario, PIM disconnects this radio path completely.

Just one single low-grade connection can lead to the output of the interfering PIM signal becoming greater than the actual useful signal. A user will see 'good reception' displayed on their smartphone, while on the receiver end of the base station, the useful signal and the spurious signal caused by PIM are equally strong. This means the base station can no longer differentiate between the useful signal and the disturbing signal. This causes disconnections, dead spots and lower data transfer rates: the customer is dissatisfied.

The service now becomes expensive for the network provider. Because customer complaints, troubleshooting and on-site service calls now needed. The complete signal path of the base stations in question must be remeasured. The most probable causes of unwanted PIM are faulty connectors, defective jumpers and insufficient connector tightening torques - the service costs are far higher than the investment costs for a better plug or jumper, not to mention the costs caused by the unsatisfied customer.

The introduction of new technology, such as LTE, demands the best quality for all products used in the signal path in order to minimize the risks caused by PIM.

The products in the SPINNER range fulfill these requirements completely. The best possible connection quality, optimized installation and flawless operation are guaranteed through our high quality standards for design, material and manufacturing, even under the toughest environmental conditions.

SPINNER connectors, from our MultiFit range for example, are available for all conventional cable sizes and manufacturers. They are easy to install, can be fixed with their matching torque wrench and guarantee a very low PIM value. SpinnerFlex® jumpers guarantee 100% quality with 100% PIM and VSWR performance - even outdoors and for many years. The wide range of SPINNER combining products makes it possible to interconnect different frequency bands. Whether you need to combine two, three or even four frequency bands, the SPINNER diplexer, triplexer or quadruplexer guarantees a faultless connection with its high quality and excellent PIM performance and can significantly reduce operating costs.

SPINNER products help all mobile network users. They minimise PIM, making it possible for us to use the phone without any disruptions and surf the internet with our device's complete bandwidth. And the network provider has satisfied customers and can minimise its service costs.