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COMPONENTS   Switchable Filter Module The model FA4489 switchable filter module is capable of selecting one of nine channels with a TTL control signal. The device is used typically as a front-end preselector in a high dynamic range receiver. The module offers a proprietary switching matrix, low intermodulation distortion...

AROUND THE CIRCUIT   INDUSTRY NEWS Alpha Industries Inc. , Woburn, MA, has completed the sale of its Digital Radio Transceiver Business to the newly formed company Advanced Frequency Products LLC (AFP) for an undisclosed amount. AFP, a developer and manufacturer of digital radio transceivers, transportation safety and motion-sensor...

NEW LITERATURE   Wireless Component Brochure This four-page brochure lists several manufacturers’ available stock of RF/microwave connectors and wireless components, including switches, mixers, power dividers, directional couplers, GaAs MESFETs, duplexers, inductors, attenuators, DC blocks and phase trimmers. East Coast Microwave Distributors Inc., Stoneham, MA (800) 786-2576. Probe Brochure This...

NEWS FROM WASHINGTON   Preliminary Observations Find Army’s Digital Force Wanting As reported in Defense Daily, a team of retired military officers who observed the Army’s recent battlefield digitization experiment found that the troops equipped with computer equipment were no more lethal than conventional forces. The observations were made...

INTERNATIONAL REPORT   New Developments on ASTOR Front Following the selection of consortia led by Lockheed Martin and Raytheon E-Systems (RES) as final bidders in the UK’s Airborne Stand-off Radar (ASTOR) competition, new details have emerged concerning the proposed radars. Lockheed Martin is proposing an entirely new radar, which...

COMMERCIAL MARKET   Twelve Million Satellite Voice Terminals to be Installed by 2002 A report to be issued by Allied Business Intelligence, “Bandwidth On-demand Satellite Systems: 97,” studies the emerging market for satellite systems that will connect individuals upon demand without the user being required to lease time in...

THE BOOK END   Passive Microwave Device Applications of High Temperature Superconductors M.J. Lancaster Cambridge University Press 340 pages; $79.95 This book stems from laboratory work performed on high temperature superconducting (HTS) materials and the microwave aspects of these materials. In less than 10 years, superconducting communication and signal...

A Solid-state Power Supply/Modulator System MagCap Engineering Inc. Canton, MA New advances in high power insulated-gate bipolar transistor and FET technology have made the design of solid-state high power transmitters possible. Thyratrons have been used traditionally as the main high power switch in radar modulators. Recently, solid-state switches in...

Quadrature Hybrids and Directional Couplers for Telecom Applications Sage Laboratories Inc. Natick, MA Traditional couplers and hybrids have been manufactured using stripline, microstrip, airline, transverse electromagnetic line and waveguide technologies, and have been driven primarily by the military and low volume test set markets. As such, these devices have...

GaAs MMICs for Changing Base Station Requirements Hittite Microwave Corp. Woburn, MA Today, wireless infrastructure designers are being faced with increasingly challenging design requirements. Cellular base transceiver stations (BTS), or base stations, are becoming smaller, smarter, higher performance, self-contained and lower cost simultaneously. Early cellular BTS designs, which are...