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“Be Very Careful”
By Tom Kurian, President & CEO, Renaissance Electronics Corp. |
“Be very careful” — a mother’s passing comment to her kids as they head outside. The words describe a way of living that is precise, accurate, and deliberate. It involves both forethought and a heightened sense of awareness. I wrote this to build awareness in companies involved in manufacturing and trading products for defense and Sat-Com programs.
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 Another Sad Moment For the FCC
By Barry Manz
A significant number of rooftop antenna sites owned primarily by wireless carriers exceed FCC public and occupational exposure limits, make it impossible for workers to avoid standing in front of antennas, and are inadequately posted with warnings and barriers. Read More...
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 High Power Duplexers and Triplexers
A new line of high power duplexers and triplexers designed for 4G LTE build-out has been released. It includes the Model FD2001 DIN-R Duplexer, Model FT2001 DIN-R Triplexer, and Model FT2001(D) DIN-R Dual Triplexer.
Trilithic RF & Microwave
 Versatile New LNAs
Two packaged low noise amplifier (LNA) gain blocks deliver cost-effective high performance over very broad bandwidths of 50 MHz to 4 GHz. They combine very high linearity with very low noise figures, making them ideal for high-performance wireless infrastructure.
Triquint Semiconductor
 Precision Coaxial Connectors Precision Coaxial Connectors
A new line of precision coaxial connectors for semi-rigid and flexible cables is now available. Interfaces include Type N, Type N Right Angle, SMA and TNC connectors that provide excellent VSWR from DC to 18 GHz. Stainless steel passivated construction.
Vida RF
 Modular WLAN 802.11ac Test System
A new test system based on the company’s PXI 3000 Series modular instrumentation has been designed to offer measurements over a 160 MHz bandwidth at operating frequencies up to 6 GHz. It is particularly suited for making R&D, design verification, and production measurements on WLAN devices based on the IEEE 802.11ac standard.
Aeroflex Limited
 Signal Analyzer Frequency Options
Two new frequency options for the N9000A CXA X-Series signal analyzers provide a low-cost solution for essential microwave signal characterization up to 13.6 and 26.5 GHz. Features include quick measurement of spurs and harmonics due to the CXA’s speed and DANL performance.
Agilent Technologies
 Hand-Flex™ Coaxial Cable
The 141-20SM+ Hand-Flex coaxial cable is ideal for interconnection of coaxial components or sub-systems. The construction includes a silver-plated copper clad steel center conductor which maintains the shape after bending. Frequency coverage is DC to 18 GHz.
Mini-Circuits
See all products in this issue
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October 2012
Designing Power Amplifiers to Operate and Coexist in the Public Safety Domain
By Dimitrios B. Kontolios, Sales & Applications Engineer, AccelComm/AC Group, Inc.
A prominent provider of wireless solutions approached us for assistance in developing power amplifiers for their systems because their engineers believed their current systems would not meet FCC Narrowbanding requirements for the next year. They supplied us with their specifications, mostly around the VHF/UHF, 700MHz, & 800 MHz Public Safety Bands anywhere from 5 MHz to 20 MHz bandwidths with 6 KHz and 12.5 KHz modulation spacing in their digital transmission capabilities. Although “the customer is always right” motto prevails in our business model, our diligent and always curious Product Line Manager decided to research and find out for himself if these specified power amplifiers that he was about to design would meet FCC requirements.
The FCC has implemented the Narrowbanding Mandate which states that all public safety and industrial/business land mobile radio systems operating in the 150-174 MHz and 421-470 MHz bands must cease using 25 kHz efficiency technology and begin using 12.5 kHz efficiency technology. The purpose of Narrowbanding is to operate more efficiently creating additional channel capacity, either with narrower channel bandwidths or an increased number of voice paths or a higher data rate per channel to support more users. The deadline for conforming to the Narrowbanding Mandate is January 1, 2013.
The 700 MHz Public Safety Band comprises 24 megahertz of spectrum designated for public safety use. The Narrowband segment of 769-775/799-805 MHz consists of 1920 6.25 KHz-wide channels operating as 960 pairs. 800 MHz Band Reconfiguration was implemented to address the growing problem of harmful interference caused by high-density commercial wireless systems to 800 MHz public safety communication systems at 806-824 MHz paired with spectrum at 851-869 MHz. All FCC requirements and further information can be found at: www.fcc.gov/topic/emergency-communications
To meet requirements, power amplifiers have to be very linear at all these very narrowbands to perform with efficiency. AccelComm is already prepared to meet these new stringent FCC requirements for its customers by providing power amplifiers with RF Predistortion techniques which are capable of compensating for nonlinearities such as AM-AM and AM-PM distortions, spectral regrowth, memory effects and other signal impairments. For more information on all AccelComm products and capabilities, visit: www.accelcommgroup.com.
AccelComm/AC Group, Inc.
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MILITARY MICROWAVE DIGEST |
•Directivity and VSWR Measurements
Return loss and VSWR measurements are complicated by the finite performance of the directional device used to measure the reflected power. The only accurate and convenient way to make return loss measurements is with a well matched high directivity directional coupler or bridge.
Marki Microwave
•Switch Solutions for Systems with Low PIM Requirements
Dow-Key Microwave has invested in R&D for new RF switch products designed specifically to reduce intermodulation (IM) in coaxial switches.
Dow-Key Microwave
• How to Specify RF and Microwave Filters
Covers cavity, ceramic, LC, crystal and helical filters.
Anatech Electronics
• Mounting Considerations for Medium Power Surface-Mount RF Devices
Covers all factors that must be considered when mounting SMT devices.
TriQuint Semiconductor
• Biasing MMIC Amplifiers
How to bias MMICs along with theory and techniques.
Mini-Circuits |
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