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Your RF Cafe
Airplanes and Rockets:
Issue: November 2011
Ericsson Leads in Backhaul
In-Stat says Ericsson is the largest supplier of LTE packet backhaul equipment with 25% of the market and the research firm suggests it will remain so through 2013. In-Stat research indicates Ericsson will end 2011 with more than $250 million in global LTE packet backhaul equipment revenue. Other major players are Alcatel-Lucent, Nokia Siemens Networks, Huawei, Samsung, and Cisco, adding up to 93% of the market with ZTE, Juniper, NEC and Tellabs making up the rest. Read more...
A $25 Computer?
The Raspberry Pi, a computer board developed by a UK-based foundation, is designed to sell for $25 in order to promote the study of computer science and related topics in schools. The foundation is developing, manufacturing, and distributing the computer for use in teaching computer programming to children and hopes that it will have many other applications both in the developed and the developing world. It is about the size of a credit card and plugs into a TV or can be combined with a touch screen making a low-cost tablet. Hardware includes a 700-MHz ARM11 processor, 128 or 256 Mbytes of SDRAM, OpenGL ES 2.0, 1080p video decoding and composite and HDMI video output. It has USB 2.0, a SD/MMC/SDIO memory card slot and optional 2-port USB hub and 10/100 Ethernet controller. Read more...
The company well known to veteran amateur radio operators for its inexpensive yet capable receivers, transmitters, transceivers (remember the Benton Harbor Lunchbox?) and other equipment has reintroduced kits after ending their production in 1992. However, they won’t be what most readers would expect (or perhaps hope), since they are focusing on technical education curriculum, courseware, and hardware to assist academic institutions, corporations, training centers, and 'self-study' users. They cover PC, telecom, “core”, life science, robotics, language, “green”, and auto technology. Read more...
A Message from
The fundamental role of design engineers is to solve problems. As it pertains to filters, designers too often spend precious hours creating a set of filter specifications that are either “overkill”, cannot be realized with a specific filter, or are physically incompatible with the confines of the circuit or its enclosure, to name a few. Calling one of our application engineers is not “giving up” but a way to save a lot of time and frustration -- and often money as well. We’ve been designing and manufacturing filters for more than 20 years, and the problem you’re facing more than likely resembles one we’ve successfully solved before.
Filters are deceptively simple devices since after all, their job is to eliminate unwanted signals so the desired signals can pass unhindered. However, every type of filter has unique characteristics that make it suited for particular applications and some of these characteristics overlap. So it's possible to specify one type of filter when another type would be less expensive, deliver equal or better performance, or be more appropriate for its environment. There are an unlimited variety of variations on this theme, and the best way to sort them out is to talk to one of our applications engineers.
For example, most applications can easily tolerate a VSWR of 1.5:1 but we often receive requests for much lower values, which will drive up the cost of the filter. Upon inspection of the actual problem at hand, we often find that a lower VSWR is simply unnecessary, saving the design engineer and his or her company money. The same applies to many other filter specifications as well. Another common problem is leaving the task of integrating the filter into the circuit to the end of the design cycle, even though it is critical in determining overall performance. In this case, the time and cost required to remedy the problem is almost invariably higher than it would've been if filtering was considered at the first stages of design. When you’re about to design a circuit in which filtering is a key factor, please call us when you begin. The time you save can be better spent doing what you do best.
You can reach us at (973) 772-4242, or send an e-mail to
Happy Thanksgiving from all of us here
Need Help Getting Started? These Guides Can Help!
They’re not a substitute for a phone call or an e-mail to our application engineers, but these documents give you the basics. Even more useful documents are available at the Technical Resources links at AMCRF.com or anatechelectronics.com.
Answers to last month's Sports Trivia Questions
1. What disorder did Muhammad Ali develop after years of catching blows?
2. What comic actor scored huge sales with his Bad Golf Made Easy instructional videos?
3. What country fielded 1996 Olympic women's teams that won gold in basketball, soccer and softball?
Sports Trivia Questions!
1. What sport used the term "home run" long before baseball?
2. What's an NBA player deemed to be if he's received the Maurice Podoloff Trophy?
3. What nickname do boxing fans call 300-pound Eric Esch, King of the Four-Rounders?
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