- RF Cafe Homepage -
"Those who cannot remember the past are condemned to repeat it." - Santayana

Tech Headline News

- Archives -

Air Force Weather Satellite Explodes in Orbit (since when do those things just explode? global warming caused it?)

Boeing’s First Two All-Electric Satellites Ready for Launch

Ikea Turns Furniture into Wireless Phone Chargers

Isis threatens Twitter Employees over Blocked Accounts (no prob - they're just the JV team)

Counterfeit Components Continue to Slam Electronics Industry

Western European Mobile Phone Market Shows Clear Signs of Saturation

First Ever Photograph of Light as a Particle and a Wave

Photographs of Lowest Lifeforms Obtained (I expected images of politicians)

Millions Share New Chinese Character

Google Allocates $∞ for Hackers Finding Security Flaws in Chrome

Telcos Demand 'Level-Playing Field' with Apps Giants

Foreign Workers Fill Hundreds of Sacramento-Area IT Jobs

RIP Leonard Nimoy, Mr. Spock of Star Trek (has he returned to the Genesis planet?)

Vandalism in Arizona Shut Down Internet, Cellphone, Telephone Service Across State

Huawei and LG Unveil Traditional Round Smartwatches

Hi-Speed Transistors from Liquid Processing

Report on the European
Radio Industry

By 1946, radio and television manufacturers were scurrying to supply the huge, pent-up demand for communications and entertainment systems that accumulated during World War II. Fortunately, the dearth of electronics components, raw materials for chassis fabrication, and available labor was suddenly and significantly turned around by late 1945. Wanton destruction of entire cities in Europe left citizens without many basic creature comfort items like radios, televisions, refrigerators, vacuum cleaners, toasters, automobiles, and other things taken for granted a decade earlier. As with any well-executed plan, manufacturers endeavored to survey the market demand for such products and then devised …

everythingRF Lists > 100,000
Products, >400 Manufacturers

everything RF, the leading online website for the RF & microwave industry, has announced that they have now listed over 150,000 RF & microwave products from the leading manufacturers. everything RF has developed a parametric search technology which searches through multiple manufacturer catalogs to find products based on specifications. Engineers no longer need to visit multiple manufacturer websites to find products that meet their requirement. Users can compare products across companies, download datasheets, get pricing and request quotations. RFQs generated via everything RF …

Author:
Kirt Blattenberger

Training with Visual Aids

Long before there was Power Point (OpenOffice's Impress is the free equivalent), presentations at training seminars were conducted using overhead projectors and larger-than-life props of the devices being taught. The U.S. Navy, during World War II, set up a special facility called the Visual Aid Model Shop located at Radio Chicago, Chicago, Illinois. Its charter was to design and build very large scale models of equipment and tools that service personnel used while performing their duties. It is kind of funny to look at the sizes of some of the items, like the 8x size radio chassis assembly shown in this article's main photograph. As a life-long model builder myself, I would have loved to work in a shop …

NI AWR Design Environment
Application Note Now Available

NI (formerly AWR Corporation) released a new NI AWR Design Environment application note, “Improving the Second-harmonic Pass Band Rejection of Microstrip Side-coupled Filters.” Because of their low cost and easy manufacturability, side-coupled filters constructed from printed-circuit board-based microstrip are widely used throughout the industry. One of the main drawbacks of the side-coupled filter is its limited rejection of the second harmonic. This application note demonstrates a solution that mitigates this problem through the introduction of notch-filter elements that improve the overall rejection of side-coupled filters at the second harmonic without significantly affecting the filter passband behavior …

See The Full-Page Splash Ad
You've Been Missing on RF Cafe

Are you kidding me ?!?!?! Why in the world would you WANT to see a full-screen splash ad when you visit any website? I absolutely detest those things. When I visit a website, I want the first thing I am presented with to be the content of the site, NOT a full-page advertisement with some lame message like, "Please wait while your page is loading," or "Welcome Screen," or some other annoying and/or disingenuous text. Do the webmasters really think visitors are stupid enough to believe that the website's real content is loading behind the advertising screen, and that they are doing visitors a favor by providing …

Chinese Vacuum Tubes

1945 or 2015? Seventy years have passed since this photo of a vacuum tube manufacturing facility in China was taken. Given that most new vacuum tubes are made in China, and that the labor work conditions have not changed much in the intervening time period (except in high-profile plants like Foxconn where Apple products are made), this might very likely represent a modern day operation. BTW, most of the vacuum tubes not being made in China are made in Russia... to assure their antiquated infrastructure has an ample supple of replacement parts. I say that only partly in jest. The largest market for new vacuum tubes is music amplifier equipment and a few …

RFMW SM Iso-Attenuator for
High Power Circuit Protection

RFMW announces design and sales support for the Iso-Attenuator model RFSL2308-A30 from RF Circulator Isolator (RFCI). RFCI Iso-Attenuators combine protection for active components from distortion or potentially damaging reflected power with a convenient, attenuated port for monitoring RF power or providing a feedback loop. The RFSL2308-A30 is capable of handling 1000 W peak / 200 W average forward power and 100 W CW reverse power into the on-board, 30 dB attenuator. Spanning 2200 to 2400 MHz, the RFCI RFSL2308-A30 provides >25 dB typical port-to-port isolation …

February 2015 Book Drawing
Winners Have New Selection

Thanks to Qorvo's Jeff Cameron, Sr. Manager, Product Marketing, Filter Solution, for providing this very high quality polo / golf shirt (made by the Pebble Beach brand) with a Qorvo company logo embroidered on the front. It is being offered as a prize selection in the monthly RF Cafe Book Drawing. I knew Jeff back in the early / mid 2000s when I worked for RF Micro Devices in Greensboro, NC. As you probably know, RFMD merged with TriQuint last year and became Qorvo. Both of February's winners have been notified, but I haven't heard back yet from either. The shirt might be gone before the March drawing occurs.

Radar Engineering Crossword
Puzzle for March 1, 2015 

I stopped creating the RF Cafe engineering and science themed crossword puzzles at the end of January in order to test the interest in them. As of today, on March 1st, I will resume creating them every couple weeks. It takes up to an hour to make each crossword. Enjoy this radar engineering themed puzzle.

Electronics-Themed Comics

It's Friday again already (...finally). In that these comics from Radio-Craft magazine have an electronics theme, you can claim looking at them is work-related. You might consider using one of them for your next conference or project status presentation. There is a list of many more similar comics at the bottom of the page in case you haven't seen them yet. Enjoy.

Magnetic Hammer

If you ever have the opportunity to read the history of the engineering efforts that went into designing and building the Saturn V rocket, you will be amazed at the ingenuity and incredible work that went into its creation. Margins of error approached single digits in some instances, like with some of the fuel tanks. According to the book NASA Apollo 11: Owner' Workshop Manual, re-design was constantly required to remove weight from already-completed assemblies in order to compensate for overweight components that could not be kept within their budget allocations. Some portions of fuel tanks were so thin that a finger poke would deform the container. This news item from a 1965 edition of Electronics World …

Notable Tech Quote:
- Marshall McLuhana

"Xerography is bringing a reign of terror into the world of publishing, because it means that every reader can become both author and publisher." - Marshall McLuhana, 1966, from March 2005 Smithsonian magazine. An unregulated Internet provided the next step in that freedom. On February 26, 2015, the FCC adopted "Net Neutrality," giving the Federal government control over the Internet under the guise of protecting little 'ol you. Be sure to thank the people you know who voted for the people who passed this. If you think you're being spied on now, you ain't seen nothin' yet.

Intermediate Engineer:
Embedded Hardware/Software
and Mixed Applications

Synergy Microwave currently has an opening for an Intermediate Engineer: Embedded Hardware/Software and Mixed Applications. A very exciting opportunity to join a strong engineering team dedicated to developing radio frequency products for the microwave communication, microwave instrumentation, radar and defense applications. You will have extremely deep resources and guidance for modern radio product development using mixed signal and digital radio techniques. Qualifications include experience in radio frequency applications, modulation algorithms, signal detection, leveling and …

Electroluminescence:
Theory and Practice

Electroluminescent (EL) devices were patented by General Electric back in 1938, but it was not until the 1960s that the fabrication process, involving copper-doped zinc sulfide (ZnS) as the light-emitting compound, had developed to the point where high volume production was feasible. Early EL displays exhibited short lifetimes and low efficiencies. EL panels are also referred to as light-emitting capacitors because of their construction geometry. Some of the first commercial applications for such EL panels were as back lighting in automobiles. Electroluminescence can also be obtained in semiconductors in the III-V group class like indium phosphide (InP), gallium arsenide (GaAs), and …

Sivers IMA Demonstrates Next
Generation Converters

Sivers IMA today announced that they are launching the next generation converters for E- and V-band radio links. The new generation converters are based on the company’s proprietary SiGe chip and offer a cost-effective and high-performance solution for those who manufacture and market radio links. Sivers IMA’s new converters are designed to support very advanced modulation schemes, which enables capacities of up to 10 Gbps. The products are developed for radio frequencies and applications between 57 GHz to 86 GHz, the so-called V- and E-bands, and will be demonstrated at the …