Telewave Introduces New PIM-Rated Collinear Antennas for 700-900 MHz Spectrum

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Telewave, Inc., a leading provider of premium quality domestic and international radio and wireless systems equipment, announces the availability of collinear antennas tested and rated to ensure very low internal generation of passive intermodulation (PIM) products.

Telewave's ANT900F2 PIM-Rated, Collinear Antenna

All of Telewave's PIM-Rated antennas are carefully built using a meticulous assembly process to prevent passive RF intermodulation.

PIM occurs when the linear signals of two or more frequencies are mixed in a nonlinear device. This can happen, for example, in loose, damaged, or corroded connectors, in damaged or poorly manufactured antennas, or as a result of rusty components like bolts or mounts.

As an increasing number of passive devices (like couplers and splitters) are being placed closer to signal sources, the potential for PIM-related problems increases. This form of interference can overpower or distort receive signals and significantly reduce overall network performance and efficiency. It can be generated when strong RF signals are too close together and get mixed, or when older equipment begins to degrade, such as if a connector is corroded, or cables get damaged. It’s particularly important to check for PIM levels when adding new carrier signals into existing antenna systems. If the system is subject to particularly high power, such as in cellular systems, intermodulation signals can be –80 dBm or higher. The use of PIM-rated components can mitigate the risk of PIM-related signal loss.

PIM sources can vary widely and include: other nearby antennas or devices, conduit that may be buried or behind barriers, and even mounts or posts. Because PIM can also be related to nearby sources of rust or corrosion, it’s sometimes known as “the rusty bolt effect.” This new series of PIM-Rated omnidirectional antennas pass rigorous testing in the manufacturing process to achieve a <-150dBc PIM rating. This means that while it is still important to also check for PIM on site after installation, these antennas won’t contribute to the ambient interference.

To prevent issues caused by poor materials or workmanship, all of Telewave’s PIM-Rated 700-900 MHz collinear antennas are carefully built using a meticulous assembly process to prevent passive RF intermodulation. Each PIM-Rated antenna is built using specially chosen and treated materials to further reduce PIM levels. Furthermore, all of Telewave’s collinear antennas are completely protected within a rugged, high-tech radome to ensure survivability in the worst environments.

For more information, visit Telewave's website or contact

About Telewave:
Telewave designs and manufactures high quality RF system products. It serves wireless system operators, public safety providers, local and state governments, and federal agencies in the United States and internationally. The company was founded in 1972 and is based in San Jose, California. Telewave strives to be the premier supplier of seamless interoperable communication systems that provide security and reliability in mission critical eco-systems for both commercial and military applications worldwide. Telewave products are used by more than 7,500 equipment and network manufacturers and government agencies throughout the world.

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Marlowe Milo
Telewave Inc.
+1 408-929-4400 Ext: 136
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