""Atoms are now such a commonplace idea that it is hard to remember how radical they used to seem." - Martin Bojowald
- Archive -
• U.S Government Allows ZTE to Partially Resume Business
• Smart TVs Track More Than What's on Tonight
• Poland Kicks off 5G Process
• China Launches New Space Science Program
• EU Watchdog Accuses Facebook, Google of Privacy Shenanigans
• Cobalt Shortages Will Drive Price for Electromobility
• NASA Embraces Commercial Electronics
• Major Security Gaps Found in the LTE Mobile Telephony Standard
• The 5G Pessimists Are Wrong
At least 10 clues with an asterisk (*) in this technology-themed crossword puzzle are pulled from this past week's (7/2 - 7/6) "Tech Industry Headlines" column on the RF Cafe homepage. For the sake of all the avid cruciverbalists amongst us, each week I create a new technology-themed crossword puzzle using only words from my custom-created related to engineering, science, mathematics, chemistry, physics, astronomy, etc. You will never find among the words names of politicians, mountain ranges, Botas Lady 5114 Áspero Mangas Retro Salvaje Mangas Tacones, li), Black (Dan li), 38 black (dan li) 0b4a37e exotic foods or plants, movie stars, or anything of the sort. You might, however, see someone or something in the exclusion list who or that is directly related to this puzzle's theme ...Generate a High-Frequency Magnetic Field Using This Resonant Technique
This article by KC Yang piqued my interest mainly because of the Helmholtz coil, whose main feature is a uniform magnetic field between the coils. Although this piece discusses generating strong, high frequency AC fields into which test samples are inserted, my first experience with Helmholtz coils was at the Westinghouse Oceanic Division in Annapolis, MD, in the 1980s. Engineers there had a test setup in a special shack located far from the main building. Non-ferromagnetic materials were used in the construction where possible - aluminum nails, wiring, hardware, etc., so at to have a minimal effect on devices under test (DUTs). Yang's application uses resonance techniques to generate high strength, high frequency magnetic fields using voltages significantly lower than might otherwise be required ...Flexible, Fingertip-Wearable Terahertz Imagers
"Researchers at Tokyo Institute of Technology have developed flexible terahertz imagers based on chemically 'tunable' carbon nanotube materials. The findings expand the scope of terahertz applications to include wrap-around, wearable technologies as well as large-area photonic devices. Carbon nanotubes (CNTs) are beginning to take the electronics world by storm, and now their use in terahertz (THz) technologies has taken a big step forward. Due to their excellent conductivity and unique physical properties, CNTs are an attractive option for next-generation electronic devices. One of the most promising developments ..."Troubleshooter's Guide to CRT Defects
As an influential member of the Internet media ;-) , I feel an obligation of sorts to make information I have access to available to fellow vintage electronics aficionados, even if it pertains to a narrow field of interested parties. Not many folks are frantically seeking assistance with troubleshooting cathode ray tube (CRT) problems, but those who are in need greatly appreciate locating content someone else took the trouble to make available. The surest way to have Google, Bing, and other search engines discover and register it is to place a link on the RF Cafe homepage. The main search engines usually grab my content within a couple hours of it being posted; that is one of the perks associated with having been around for 20 years. Many companies I have posted items about ...Free Whitepaper: Global Supply Chain Risk Report
"The report investigates actual supply chain risks faced by European companies with international footprints. Experts from Cranfield's Centre for Logistics and Supply Chain Management have analysed data supplied by Dun & Bradstreet, drawing conclusions from around 600,000 anonymous transactions between European buyers and their suppliers located in more than 150 countries worldwide. The report looks at four key metrics (Supplier Criticality, Supplier Financial Risk, Global Sourcing Risk and Foreign Exchange risk) to assess supply chain risk and provide businesses with a view of trends within their industry sector, and across the wider economy ..."The Venerable Simpson 260 Multimeter
The Simpson 260 multimeter has been around a long time - about eight decades. It is on version 8 now. My first encounter with a Simpson 260 was in my high school electrical vocational classes. We had them in the USAF radar shop as well, then in every company lab in which I worked. Sadly, I do not personally own one. John Ellis has a nice historical account of the Simpson 260 multimeter in the July 2018 issue of QST magazine. Unfortunately the ARRL does not make the article available online to non-members, but surely there is a Ham nearby who can lend you his/her copy for reading ...China Aims to Beat NASA with Super-Powerful Rocket
"China is working on a super-powerful rocket that would be capable of delivering heavier payloads into low orbit than NASA, a leading Chinese space expert was quoted as saying Monday. By 2030, the Long March-9 rocket under development will be able to carry 140 tonnes into low-Earth orbit - where TV and earth observation satellites currently fly - said Long Lehao, a senior official from the Chinese Academy of Engineering, according to the official Xinhua news agency. This compares to the 20 tonnes deliverable by Europe's Ariane 5 rocket or the 64 tonnes by Elon Musk's Falcon Heavy ..."Mac's Service Shop: Two for One
It is a rare occasion that Barney bests Mac when it comes to electronics prowess. Good natured back and forth often goes on between them during troubleshooting sessions and impromptu discussions about business practices, industry trends, and customer interactions; indeed, John Frye depends on it to make the stories interesting. This time, underling Barney exploits knowledge gained from a recently purchased electronics reference book to trip up shop owner Mac over which of two metals has the lowest resistance. Mac's choice is one many people would instinctively make - and be wrong as Mac was. Here is a table of electrical resistivity values for various metals and substances ...Free Engineering & Technology Magazine Subscriptions
Whitepapers, pamphlets, books, magazines, and chapter examples listed here are a small sample of a lot of new items that are offered for FREE through TradePub. The publishers make them available to qualifying people as a promotional campaign for their full line of offerings. Whitepaper topics include careers, manufacturing, and engineering, while magazine titles include Microwave Engineering Europe, Electronic Design, and Microwave Product Digest. Note: I earn a few pennies when you subscribe to these so please help yourself and me ;-) ...Ford Mustang Price with Tariffs
A radio announcer mentioned today that the base price of a Ford Mustang in the U.S. is $25k while in China it is $64k. A Chevy Camaro costs about $27k in the U.S. and
With even a modicum of familiarity with vacuum tube terminology, you will fairly easily complete the custom crossword puzzle. This Electron Tube Crossword Puzzle appeared in the May 1959 issue Electronics World, which was the first sporting the name change from Radio & TV News. If you are a hard-core crossword puzzle worker, then check out my weekly RF Cafe crossword puzzles that draws upon a custom dictionary of thousands of engineering, science, chemistry, and other technical words, along with words from current news items. Bon chance ...Whitepaper: Recruiting Millennials
This could be useful insight into the thinking of the new cadre of college grads. "Leadership estimates that within three years, 60% of their worldwide employees will be Millennials. In an effort to attract these recent college graduates, Unilever partnered with HireVue to transform recruitment efforts using digitally recorded interviews and science-based assessment tests and data analysis. This Bersin by Deloitte case study: Explains the challenges in recruiting Millennials. Reveals how the company digitally transformed the way it hires recent graduates. Demonstrates how to adopt cutting-edge technology while dramatically reducing costs and time to hire ..."Facebook's Project Aquila Arial Base Station Crashes
"Facebook has cancelled its UK-based high altitude unmanned aircraft project, Aquila. The project, based in Somerset, aimed to provide Internet basestations that could stay in the air for weeks at a time at an altitude of 60,000 ft. However the 2 kW power requirements and the laser communications technology that was intended to link aircraft in the sky and to the ground were both significant challenges. 'The only spectrum available for these platforms wasn't suitable for broadband due to technical and geographical limitations,' said Yael Maguire, director of engineering at Facebook ..."
Germanium was "the" semiconductor of choice in 1959 while advances were being made with silicon. Most of the newer semiconductor devices were being fabricated with germanium as the central transducer element. Temperature sensors, strain gauges, "sensistor" variable resistance units, Hall effect sensors and gyrators and circulators, torsional (twist) transducers, displacement sensors, and even neutron detectors were done in germanium. Even though silicon is referenced as being applicable to all the devices, it was not until the 1960s that silicon began to dominate semiconductor fabrication. This paper titled ,"From Germanium to Silicon, A History of Change in the Technology of the Semiconductors ..."Thanks Once Again to everythingRF for Long-Time Support!
Please take a few moments to visit the everythingRF website to see how they can assist you with your project. everythingRF is a product discovery platform for RF and microwave products and services. They currently have 169,552 products from more than 1040 companies across 258 categories in our database and enable engineers to search for them using their customized parametric search tool ...Whitepaper: 7 Hidden Costs and Fails of Legacy Mobile Testing Labs
"Rapid evolution and penetration of mobile technology has totally changed the way Dev teams test apps. Yet, some of the biggest names in cloud-based testing have not evolved their models to keep up with this change. Their legacy technology and approach results in costly production glitches and app abandonment. Legacy labs including AWS Device Farm, Perfecto and SauceLabs continue to charge a fortune for capabilities which are out of date and unnecessary. In this paper we will reveal seven hidden costs and capabilities which legacy mobile testing labs charge for but do not deliver. Then we will introduce a new high-performance ..."TUM Researchers Bring THz Electronics Nearer
"Technical University of Munich physicists Alexander Holleitner and Reinhard Kienberger have succeeded in generating electric pulses in the frequency range up to 10 THz using tiny, so-called plasmonic antennas and run them over a chip. Researchers call antennas Botas Lady 5114 Áspero Mangas Retro Salvaje Mangas Tacones, li), Black (Dan li), 38 black (dan li) 0b4a37e plasmonic if, because of their shape, they amplify the light intensity at the metal surfaces. The shape of the antennas is important. They are asymmetrical: One side of the nanometer-sized metal structures is more pointed than the other. When a lens-focused laser pulse excites the antennas, they emit more electrons on their pointed side than on the opposite flat ones. An electric current ..."Hi-Fi Crossover Networks
Since I am currently planning a loudspeaker configuration to replace the original speaker in my 1941 Crosley 03CB floor model AM / shortwave radio set, this article made for a good refresh on audio frequency crossover networks. A very nice set of design charts is provided. Lucha libre Of course today there is no need to design and build your own since commercial units are very good and cost less than what I could build myself. Many moons ago while serving in the USAF at Robins AFB, Georgia, I did actually build my own crossover circuit for use in custom speaker cabinets I made in the base woodshop. The speaker that came in the Crosley has a 12" cone, which is still in good condition, but it uses an electromagnetic voice coil rather than a permanent magnet like modern speakers use ...
1996 - 2018
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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