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Wideband PCS/cellular TMA lifts wireless data bit-rate Radio Frequency Systems has unveiled an important new addition to the company’s comprehensive active RF conditioning suite —a new low-noise TMA is specifically designed for universal mobile telecommunications system (UMTS) PCS-band/cellularband overlay applications. It provides the essential gain boost required to ensure optimal subscriber bit-rate in wireless data applications. “Network performance will make or break carriers in the emerging wireless data market,” said RFS Director, Marketing and Technical Services, David Kiesling. “Accurate control and management of RF power levels, antenna beam direction, and most particularly, signal-to-noise ratio will be the critical differentiators in the wireless data market. Our new wideband PCS/cellular TMA is an important element in realizing such solutions.” The new wideband TMA provides carriers with higher data subscriber rates without reducing capacity, by improving base station receiver sensitivity and enhancing overall cell coverage. It provides a unique dual-band full-duplex amplifier solution for both cellular and PCS bands. With a nominal gain of 12 dB, the unit is particularly lightweight (less than 10 kg (22 lbs)) and compact, making it ideal for tower-top mounting. This multi-function TMA is available in four configurations: co-located cellular/PCS with amplification in both systems, co-located cellular/PCS with a bypass on the cellular bands, PCS-only, and cellular-only. The TMA’s dual-duplex configuration enables the use of a single feeder for both transmit and receive paths. Its integrated diplexer obviates the need for an external diplexer at the tower top, thus reducing tower loading. The new TMA supports transmit/receive bands of 869 to 894 MHz/824 to 849 MHz on the cellular side, and 1930 to 1990 MHz/1850 to 1910 MHz on the PCS side. For increased reliability, the unit is equipped with a bypass switch in both bands. The TMA features a mid-band noise figure of less than 1.7-dB on both cellular and PCS sides, and a transmit path insertion loss of less than 0.5 dB. Its precision filter roll-off (15 dB/MHz on the cellular side, 5 dB/MHz on the PCS side), ensures improved transmit-receive isolation and reduces absolute delay variation in the uplink. 4 WHAT’S NEW New I-BSA band-selective amplifiers At the CeBIT exhibition in March 2005, Radio Frequency Systems launched two new band-selective bi-directional amplifiers designed for the 800 MHz and 900 MHz frequency bands. The compact I-BSA800-1 and I-BSA900-1 amplifiers feature finely adjustable frequency bandwidth selectivity via a unique PC-based configuration software tool. The uplink/downlink frequency ranges supported are 824 to 849 MHz/869 to 894 MHz and 890 to 915 MHz/935 to 960 MHz respectively for the I-BSA800-1 and I-BSA900-1. “As the new I-BSAs are sub-band selective they are the ideal complements to RFS’s broadband I-BDA bi-directional amplifier family,” said Stefan Lehmann, RFS Area Product Manager Wireless Distributed Communication Systems. Separate gain adjustment for uplink and downlink is achievable while maintaining the same power output in both directions. As a result, the I-BSA is the ideal point-of-interface (POI) for in-building systems founded on external antennas. According to Lehmann, the I-BSAs have been designed to receive and re-transmit signals derived from antennas outside a building, and amplify only the selected bands for in-building distribution. With the RFS I-BSA series providing the building’s primary POI amplification and band selection, localized signal amplification can be provided throughout the building using RFS’s broadband I-BDA units. “Whether you have a strong or weak link from outside the building, regardless of what’s behind the amplifier, the RFS I-BSAs provide a great deal of flexibility in planning and system set-up,” said Lehmann. For the European and Asian markets, the I-BSA900-1 has been specifically designed for global system for mobile communications (GSM) in the 900 MHz band. Similarly, for the American and Asian networks, the I-BSA800-1 is tailored to suit services in the cellular 800 MHz band (code division multiple access (CDMA), time division multiple access (TDMA) and the analogue advanced mobile phone standard (AMPS)). Allowing precision adjustments, the I-BSA800-1 and I-BSA900-1 feature variable frequency bandwidth selection from 0.03 MHz to 25 MHz, and 0.2 MHz to 25 MHz, respectively. “Such fine-tuning is possible just by connecting a laptop to the device,” said Lehmann. The user-friendly programming software—which allows authorized access only, for reasons of security and asset management—provides the ability to configure the I-BSA’s frequency bandwidth, amplification and gain. Uplink and downlink gain is adjustable in 2 dB steps between 20 and 60 dB, while output power is 22 dBm (in both uplink and downlink) at maximum gain.
FM antenna: lightweight and low-cost The new single-channel CPF-series sidemounted FM antenna from Radio Frequency Systems offers a low-cost, lightweight solution for low to medium power applications in the 87.5 to 108-MHz band. Featuring robust stainless steel construction, the CPF-series is available with singleelement power ratings of 500 W (CPF500) or 2.5 kW (CPF2500). A new incarnation of RFS’s popular ECFM antenna, the circularly-polarized, omnidirectional CPF-series FM antenna features extended power range and other design enhancements. In particular, the radiation pattern and axial ratio of the side-mounted CPF-series have been enhanced to minimize tower effects and downward radiation. The CPF-series is also available prepackaged in multi-element arrays with a range of gains, utilizing high-quality RFS power dividers and distribution cables. Powers of up to 20 kW are possible for an eight-bay antenna array, with gain of up to 6 dBd in each plane. Radome options for the CPF-series include a feedpoint radome, or alternatively a spherical radome that fully encloses the radiating element for locations when icing is a problem. Other optional components include heating elements and an input tuner for optimizing voltage standing wave ratio (VSWR). The single-channel CPF-series FM antenna complements RFS’s existing 828-series of FM broadband panel arrays. RADIAFLEX ‘A’ RAYU AT optimally tuned Uniquely low longitudinal attenuation and coupling loss, resulting in low overall system loss, characterise Radio Frequency Systems’ new RAYU158-50JAT coaxial cable—the latest addition to RFS’s popular RADIAFLEX ‘A’ range of foam-dielectric radiating cable. Ideal for use in tunnels and metros, the bandselective 1-5/8-inch diameter RAYU158-50JAT radiating cable is optimized for operation in two important bands: 800 to 1000 MHz and 1700 to 2200 MHz. From a global perspective, these two bands cover the majority of current commercial in-building/in-tunnel radio services. According to Stefan Lehmann, RFS Area Product Manager Wireless Distributed Communication Systems, RFS has achieved optimal performance for these popular and comprehensive bands by shifting the RAYU158-50JAT cable’s stopband into the 1000 to 1650 MHz range. “Stopbands are inherent physical properties of radiating cable,” said Lehmann. “By careful modelling and simulation, we have precision-tuned the RAYU158-50JAT cable so that the stopband is where we want it—out of the way.” As with all RFS RADIAFLEX ‘A’ products, the RAYU158-50JAT cable offers superior electrical performance, together with good bending properties, and can support multiple communication systems simultaneously. It is also available with a flame and fire retardant jacket (RAYU158-50JFNAT), or a flame/fire retardant and low smoke jacket (RAYU158-50JFLAT), to meet the applicable International Electrotechnical Commission (IEC) standards. 5 CELLFLEX ‘A’ premium attenuation Radio Frequency Systems has unveiled the next evolution of its popular CELLFLEX ‘A’ series high-performance feeder cable—the new ‘premium attenuation’ variant. Adding to the feeder system’s already superior attenuation performance, the new CELLFLEX ‘A’ premium attenuation offers a further reduction in feeder attenuation up to five percent at 2100 MHz. The CELLFLEX ‘A’ premium attenuation variant has been specifically developed to meet the more demanding attenuation performance requirements of third-generation (3G) cellular networks, while retaining ease of cable handling, mechanical integrity and current connector inventories. Available to all global markets in early-June 2005, the new CELLFLEX ‘A’ premium attenuation series will be available in three popular sizes: 7/8 inch, 1-1/4 inch and 1-5/8 inch. Attenuation improvements achieved at 2100 MHz by these three feeder sizes are 3.3 per cent, 4.1 per cent and 5.0 per cent respectively, adding to the average six per cent attenuation improvement already offered by CELLFLEX ‘A’. “The issue of attenuation is clearly important, but so too is ensuring that the feeder solution remains ‘installer-friendly’,” said Chris Adams, RFS Global Product Manager Transmission Lines. “We were well aware of this real-world multi-variable situation when we developed CELLFLEX ‘A’, and have come up with a product that represents the optimal balance in all key performance areas. The new CELLFLEX ‘A’ premium attenuation variant provides an important enhancement for our 3G customers, while retaining this all-important feeder system performance balance.”
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Page 17: RADIO FREQUENCY SYSTEMS The Clear C

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