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Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe-Archive -

? Bloomberg Finds5G Networks Across Asian Cities to be Patchy

? Secretary of Defense Meets withFCC Chairman on Ligado

? Ericsson Mobility Report ShowsMobile Networks' Crucial Role During Wuhan Flu Pandemic

? Skin Cream Used toPrevent Li-Ion Battery Fires

?T-Mobile Lays off Hundreds of Sprint Employees

?U.S. Space Force Invokes Defense Production Act for Small Launch Market

? FCC Denies Petition SeekingDelay to C-Band Auction

?Wuhan Flu Pandemic Causes 18% Drop in New IoT Devices

? It'sRaining Plastic Everywhere (this is spooky)

Half a Century of Electronics Publishing: Radio-Electronics

Half a Century of Electronics Publishing - 50th Anniversary, April 1958 Radio-Electronics - RF CafeThe iconumerator (electronic particle counter), the vidicon tube (TV image recorder), the Electro Importing Co.'s Telimco (world's first home wireless outfit), the Wireless Association of America (founded before ARRL), the Dynamophone (voice-activated switch), the "Swatties" (members of the Society of Wireless Telegraph Engineers), the "Detectorium" (silicon crystal detector), Ralph 124C 41+ and his sweetheart Alice 212B 423 (Gernsback sci-fi series) were covered. Radio Amateur News predated QST as America's premier magazine for Hams, the famous 1919 "Verboten" cartoon (protested limitations on private radio operators from the wartime era), the de Forest "Oscillion," Major Armstrong's superregenerative circuit, the first "network" broadcast (WEAF in New York City and WNAC in Boston), the Reinartz, the Super, the Autoplex, the Solo dyne, and the Neutrodyn (home radio receiver kits), Tec-Teleducation (audiovisual classrooms)...

Post Your Engineer & Technician Job Openings on RF Cafe for Free

Engineering Job Board - RF CafeRF Cafe's raison d'être is and always has been to provide useful, quality content for engineers, technicians, engineering managers, students, and hobbyists. Part of that mission is offering to post applicablejob openings. HR department employees and/or managers of hiring companies are welcome to submit opportunities for posting at no charge. 3rd party recruiters and temp agencies are not included so as to assure a high quality of listings. Please read through the easy procedure to benefit from RF Cafe's high quality visitors...

LadyBug Technologies: Attenuators, Adapters, Cable Assemblies, Power Dividers

LadyBug Technologies RF Power Sensors - RF CafeLadyBug Technologies was founded in 2004 by two microwave engineers with a passion for quality microwave test instrumentation. Our employees offer many years experience in the design and manufacture of the worlds best vector network analyzers, spectrum analyzers, power meters and associated components. The management team has additional experience in optical power testing, military radar and a variety of programming environments including LabVIEW, VEE and other languages often used in programmatic systems. Extensive experience in a broad spectrum of demanding measurement applications. You can be assured that our Power Sensors are designed, built, tested and calibrated without compromise.

Triplett Electrical Instrument Company Ad

Triplett Electrical Instrument Company, July 1954 Radio & Televsion News - RF CafeTheTriplett Electric Instrument Company has been in continuous operation since 1904, although today it goes by the name Triplett Test Equipment & Tools. It was founded in 1904 in Bluffton, Ohio, by Ray L. Triplett. Mr. Triplett is holding his company's first vacuum tube tester, the Readrite Model 201, which debuted in 1921, in this full-page advertisement that appeared in a 1954 issue of Radio & Television News magazine. Triplett claims it is the first commercial tube tester. A pretty extensive search did not turn up any photos of the Model 201 tube tester, but there is a follow-on Model 215 tube tester on Steven Johnson's Readrite & Triplett history webpage. Here, too, is a very informative page outlining Triplett's history, including a picture of the "portable" ammeter built into a pocket watch case. The "new" Model 3423 Mutual Conductance Tube Tester, priced at $199.50 in 1954, is the equivalent of $1,901.50 in today's money...

ConductRF LSA61 High Frequency RF Jumper Cables

ConductRF LSA61 High Frequency RF Jumper Cables - RF CafeConductRF's latest innovation isHigh-Frequency RF Jumper Cables with 2.92 mm, 2.4 mm or 1.85 mm connectors as standard. This assemblies use our optimized direct solder attached connectors and our superior double shielded hi-frequency A61SW flexible cable with shielding effectiveness greater than -100 dB. These cables are design to support the latest requirements for 5G applications for cross connecting modules, but can equally be used in any field where hi-frequency jumper cables are required. Beyond our standard interconnect, we can also offer solutions with SMP, SMPM, SMA and many other common connector interfaces. Hi-Performance right angled options are available utilizing hard setting shrink tube to form the cable bend...

Long-Range Communications w/o Large, Power-Hungry Antennas

Long-Range Communications w/o Large, Power-Hungry Antennas - RF Cafe"Establishing long-range tactical communications for U.S. troops in remote locations currently requires giant parabolic dishes, tall pole-mounted antennas, large antenna domes, and high-power amplifiers. Besides their significant weight, power, and cost (SWAP-C), these antennas present large visual and radio frequency (RF) signatures, are vulnerable to jamming, and constitute a single point of failure. To break this dependence on big antennas and amplifiers, DARPA recently announced theResilient Networked Distributed Mosaic Communications (RN DMC) program. RN DMC aims to provide long-range communications through 'mosaic' antennas composed of spatially distributed low SWaP-C transceiver elements or 'tiles.' This approach replaces high-powered amplifiers and large directional antennas with mosaics of dispersed tile transceivers. Transmit power is distributed among the tiles, and gain is achieved through signal..."

Thanks Once Again to everythingRF for Long-Time Support!

everything RF Searchable Database - RF CafePlease take a few moments to visit theeverythingRF 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 267,269 products from more than 1397 companies across 314 categories in their database and enable engineers to search for them using their customized parametric search tool. Amplifiers, test equipment, power couplers and dividers, coaxial connectors, waveguide, antennas, filters, mixers, power supplies, and everything else. Please visit everythingRF today to see how they can help you.

Ultra-Flat Aluminum Electrolytic Capacitors

Ultra-Flat Aluminum Electrolytic Capacitors - RF CafeAn ad for Cornell Dubilier's newUltra-Flat Aluminum Electrolytic Capacitors  that appeared in Aerospace & Defense magazine caught my attention. Electrical energy density is a big topic these days with the need to cram extremely large amounts of charge storage into extremely small spaces. The future of electric-powered cars, airplanes, boats, motorcycles, portable tools and appliances, radios, phones, lights, computers, etc., depends on high density energy storage. Supercapacitors are being used in many applications in place of batteries, especially where cost, space, and an ability to be recycled (charged / discharged) thousands of times without loss of performance. Specs: 2 or 3 mm profile, high energy density of 0.4 J/cc, replaces banks of solid tantalum chips, 3000 hr life @85?C without voltage derating...

Revolutionary New Oscillator-Amplifier

Revolutionary New Oscillator-Amplifier, June 1955 Radio Electronics - RF Cafe   When I read about Du Mont's Iconumerator, the first thing that came to mind was the video of the Rockwell Retro Encabulator and General Electric's Turboencabulator. As it turns out, the Du Mont device is real. This article from a 1955 issue of Radio Electronics discusses a new type of oscillator-amplifier that works on the principle ofmicrowave amplification by stimulated emission of radiation (maser). It used ammonia as a masing medium. Masers were quickly applied to commercial broadcast systems, to military communications systems, and in laboratories. The state of the art has of course advanced far beyond the relatively crude apparatus shown here, but it is always good to have a working knowledge of the technology's history...

MPDevice: RF & Microwave Circulators & Isolators

MPDevice - RF CafeMPDevice (MPD) has become a trustworthy and reliable company in the global RF market as a manufacturer of passive RF Devices. Included are attenuators and terminations, coaxial connectors, adapters, and cable assemblies, DC blocks, surge arrestors, power combiner / dividers, and directional couplers. The Korean Telecommunication market is now entering into the era of hyperconnected society. With continuous enhancement in R&D capabilities and quality control, MPD will continue in an effort to become the No. 1 technologically innovative company with a focus on the emerging 5G marketplace.

First Radio Association: Wireless Association of America

First Radio Association: Wireless Association of America, January 1947 Radio-Craft - RF Cafe"The squeaky wheel gets the grease," is an old saw that has long been true when it comes to government policy, applying to common citizens and paid professional lobbyists alike when attempting to influence laws and regulations. Tactics range from letter writing, to peaceful town hall meetings and outdoor public gatherings, to court challenges, to large organized terrorist groups destroying property and livelihood (and often bodily harm). Some causes are unarguably righteous, peaceful and honest, while others use subversive methods to coerce policy makers into adopting their ideas. Such has been the case throughout history in all nations. Amateur radio operators have had a mostly amiable relationship with the Federal Communications Commission (FCC) since its inception in the early days of Marconi. However, due to the perceived needs (real and imagined) of wartime and commercial radio success, amateurs' privileges have been encroached upon numerous times, and it required the action of citizens to re-claim lost or prevent...

Interview Tips for Graduate Engineers

Interview Tips for Graduate Engineers - RF Cafe31-year veteran in the analog integrated circuit industry Ash Madni offers some advice to recent engineering graduates on interviews. Based on the wording of the title, "Interview Tips for Graduate Engineers," I thought the article was addressing engineers with graduate degrees, but not so; he is advising those with undergraduate degrees. Begins Mr. Madni: "After three or four years of hard study, you have graduated. Well done, and now the job hunting starts, writes Ash Madni, Head of Silicon Design at CML Microcircuits (UK) and a veteran of 31 years in the Analogue Integrated Circuit industry. Here are a few interview tips that you may find useful. My undergraduate year at Salford University I remember my first year as an undergraduate at Salford University, back in 1981. I was late for a lecture on network analysis..."

Thanks to PCB Directory for Continued Support!

PCBDirectory - RF CafePCB Directory is the largest directory ofPrinted Circuit Board (PCB) Manufacturers, Assembly houses, and Design Services on the Internet. We have listed the leading printed circuit board manufacturers around the world and made them searchable by their capabilities - Number of laminates used, Board thicknesses supported, Number of layers supported, Types of substrates (FR-4, Rogers, flexible, rigid), Geographical location (U.S., China), kinds of services (manufacturing, fabrication, assembly, prototype), and more. Fast turn-around on quotations for PCB fabrication and assembly.?

Notable Tech Quote

Notable Tech Quote: Hermann G?ring on British Radio- RF CafeOn the eve of World War II, the Brits built an amazingly successful twin-engined bomber called theD.H.98 Mosquito. It proved to be the bane of German cities, bridges, and dams. More than a decade after the aeronautics industry had switched from wooden to metal airframes, de Havilland engineers decided to design the craft using materials and techniques familiar to model airplane hobbyists - balsa, plywood, spruce, silk, and dope. The April/May 2020 issue of Air & Space magazine has a great article entitled "World War II's Strangest Bombing Mission" containing a quote fromHermann G?ring which is like music to the ears (double entendre intended) of our English brethren. To wit: "Famously, the RAF's speedy wooden workhorses left a lasting impression on G?ring. According to a 1973 history of the Luftwaffe, he later blustered, 'The British, who can afford aluminum better than we can, knock together a beautiful wooden aircraft that every piano factory over there is building... They have the geniuses and we have the nincompoops. After the war is over I'm going to buy a British radio set - then at least I'll own something that has always worked.'" Key up "God Save the King/Queen."

Electronics-Themed Comics from May 1947 Radio-Craft

Electronics-Themed Comics, May 1947 Radio-Craft - RF CafeMany topics of theelectronics-themed comics which appeared in Radio?Craft were suggested by the magazine's readers. Staff artist like Frank Beaven turned those suggestion into cartoons. For a while there was a special feature called "Radio Term Illustrated" where, as the name suggests, terms like "Signal Generator" and "High Potential" are rendered in farcical form. These four comics, two of each type, appeared in a May 1947 issue of Radio?Craft. I have to admit that even with my familiarity with vintage electronics memes I do not get the Television "Organ" comic (yes, I understand the organ grinder, but not how it applies to TV).

RF Electronics Shapes for Visio by RF Cafe
MPDevice microwave devices - RF Cafe
Lemos International TechnologiesBerkeley Nucleonics Model 865 Signal Generator - RF Cafe
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   Kirt Blattenberger,

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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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