Active Components, Bi-Directional Amplifier System Overview
RFS has the total package for cost-effective in-building solutions. Key elements of our ClearFILL RF Distribution Networks are band specific repeaters providing low cost coverage improvement in convention centers, airports, shopping malls, subways and other RF shielded environments.
The basic band specific repeater (BSR) is optimized for weather protected installations, thus reducing the cost significantly compared to similar repeater products. However, unlike low cost in-building signal boosters, the BSR has ultrahigh dynamic range to prevent overdrive and interference. All models are certified by the FCC and Industry Canada for analog and digital modulations.
The models 48710 and 48920 are designed for use in the 800 MHz SMR/public safety band, the 48722 and 48930 for use in the 900 MHz SMR/public safety band. The models 48760 and 48960 are designed for SMR800/900 dual-band applications. The 48910 is 800 MHz Cellular band specific, the 48750 and 48751 are A and B Cellular band specific respectively. The 48810A and 48810B are designed for use in the A/B/C and D/E/F blocks of the PCS 1900 band respectively.
The 48700 series can cover up to 50.000 m2 (1/2 million sq. ft.) with multiple indoor antennas. Multiple BSRs can be used for larger installations. The RFS ClearFILL approach is to use all passive RF distribution networks for low cost and high reliability. ClearFILL BSRs are fast and easy to install. Hand held performance monitors for local diagnostics and a remote performance monitoring system are available. BSRs from RFS are highly reliable thanks to our 30 years of experience in amplifier manufacturing and to the application of an industry leading cooling technique. RFS offers the total package of technical support services, from product operation and maintenance training to complete network design and installation.
Passive Components, Combining Network
Whenever more than one BTS has to be connected into RF distribution system there is a need for a combining network. This can be as simple as a crossband coupler for a two BTS system with bi-directional ports, each working on a different frequency band. This can also be a complex system combining many services spread over a number of frequency bands, all switched onto the same RF distribution network.
The performance of these combining networks strongly influences the transmission quality of the entire WINS system in both directions, up link and down link, as there are for example: intermodulation products, frequency band separation, and up/down link separation. RFS has the knowledge and many years of experience in developing and producing this equipment.
RFS offer equipment for combining of one service per frequency band as well as of multi services per band, and multi band applications. Larger complex combining networks are often customized equipment, developed or adapted to the special requirements of special applications.
RFS also offers standardized combiner modules in 19" rack technology that are suitable for many in-building and tunnel applications. One module generally features separated Rx and Tx ports for each of 4 BTS links combining them to one common port. One module serves one frequency band. Combiner modules are developed for all common mobile bands worldwide including:
- TETRA 380 MHz
- CDMA 800 MHz
- GSM 900 MHz
- GSM 1800 MHz
- PCS 1900 MHz
- UMTS 2100 MHz
Each combiner module can also be equipped with an additional RF port interface to link fiber optic converters. A 19" multi-port module can combine up to four frequency bands providing two or four common bidirectional RF ports for distribution.