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Today in Science History


The MOSFET, May 1973 Popular Electronics - RF CafeThe metal-oxide-semiconductor field-effect transistor (MOSFET) was patented in its present form by Bell Labs in 1959, following the original patent by inventor Julius Edgar Lilienfeld, in 1925. It had only been on the open market for designers to use for a bit over a decade when this article appeared in Popular Electronics. Adolph Mangieri wrote a number of articles for the magazine in the early 1970s introducing readers to the many new types of semiconductor devices coming out of research laboratories and into the commercial marketplace; e.g., "Understanding the Junction Field Effect Transistor." MOSFET's are nowadays the primary building ...

Encyclopedia of Electronic Components Volumes 1, 2 & 3

Encyclopedia of Electronic Components Volumes 1, 2 & 3 - RF CafeNot everyone who visits RF Cafe is a seasoned hobbyist, technician, or engineer. Some are newcomers to the realm and are in search of knowledge to educate and encourage them. This 3-volume set of Encyclopedia of Electronic Components is a contemporary printing of modern day parts. All standard passive and active types are covered, as are topics like sensors and human input, audio, heat, light, sound, and much more. A couple hundred reviewers give the books 4.5 stars ...

mm-Wave Far More Resilient Than Expected

mm-Wave Far More Resilient Than Expected - RF Cafe"Millimeter wave signals were more found to be more robust than expected and provided high speeds - although not gigabit speeds - at distances of several thousand feet from a node, Signals Research Group found in recent testing of Verizon's 28 GHz fixed wireless access network in Houston. 'Millimeter wave signals are far more resilient than we expected, even at distances exceeding several thousand feet. Tree foliage, passing school buses, buildings, glass ..."

Spark Kicks off 5G Era in New Zealand with Live Trial

Spark Kicks off 5G Era in New Zealand with Live Trial - RF Cafe"New Zealand telecom operator Spark announced what it claims to be the country's first live 5G mobile test site in Wellington. The 5G trial used equipment and technical support from Chinese vendor Huawei. It will test speeds, coverage and the parameters of the spectrum in a real-world environment, and run throughout March connecting equipment in a specialized vehicle drive-testing the streets of Wellington. 'We intend to be at the forefront of deploying this technology in New Zealand once ..."

ARRL Urges FCC to Reinstate Noise Floor Study

ARRL Urges FCC to Reinstate Noise Floor Study - RF Cafe"It seems like the FCC's recent interest in doing an in depth study of the growing RF spectrum noise floor has taken a new twist. The FCC's apparent lack of real action in gathering the data needed to make serious inroads into RF noise pollution has drawn the attention of the ARRL, which voiced their concerns in a recent ARRL Letter as well as in their formal response to the FCC. The ARRL 'took the opportunity to strongly urge the FCC to reinstate a 2016 TAC noise floor study, which, ARRL asserted, apparently was terminated before it even got started.' It would seem ..."

Analysts Predict >500 Million NB-IoT Connected Devices by 2025

Analysts Predict Over 500 Million NB-IoT Connected Devices in Use by 2025 - RF Cafe"Narrowband Internet of Things (NB-IoT) has reached critical mass as network operators all over the world have announced their deployment plans. Last year, the NB-IoT market was driven by a handful of operators, primarily in Asia and Europe. U.S. operators Verizon, Sprint and T-Mobile have started to fast track their NB-IoT development. By the end of 2018, most of the U.S., Europe and Asia Pacific will be covered by at least one NB-IoT network. Despite the early lead by unlicensed Low Power Wide Area ..."

MEMS Technology Shrinks Loudspeakers

MEMS Technology Shrinks Loudspeakers  - RF Cafe"Miniature MEMS-based speakers could revolutionize speech and music reproduction in mobile communication devices. They combine the advantages of a large frequency bandwidth and high acoustic quality with the ability to generate very high sound levels. Nevertheless, they are so tiny that they can be integrated into headphones. Such micro-loudspeakers were developed by the Fraunhofer Institutes for Digital Media Technology (IDMT) and Silicon Technology (ISIT). MEMS technology stands for microelectromechanical systems and combines classical ..."

Webinar: Introduction to Radar

Introduction to Radar Webinar - RF CafeMicrowave Journal is conducting along with National Instruments and Wolfspeed a webinar titled, "Introduction to Radar," on Wednesday, March 28, 2018, at 11:00 AM. Mr. Scott Bullock presents on the topics of radar detection and ranging, pulse vs. CW, radar modulation, radar path budget, basic radar equation, radar range equation, range ambiguity and mitigation, maximum and minimum detectable range, and more ...

Mystifying Physics of Paint-on Semiconductors

Mystifying Physics of Paint-on Semiconductors - RF Cafe"It defies conventional wisdom about semiconductors. It's baffling that it even works. It eludes physics models that try to explain it. This newly tested class of light-emitting semiconductors is so easy to produce from solution that it could be painted onto surfaces to light up our future in myriad colors shining from affordable lasers, LEDs, and even window glass. These materials are very radiant. The nagging question of whether hybrid organic-inorganic perovskites (HOIPs) could really work just ..."

Transient Specialists Offers Automotive Immunity Transient Test Generator

Transient Specialists Offers Automotive EMC Immunity Transient Test Generator - RF CafeTransient Specialists, a leader in electromagnetic compatibility rentals for over 30 years, announces that they will be offering rentals of the NSG 5500 by Teseq this coming May. This compact Automotive immunity transient test generator allows for testing for to meet standards of ISO, SAE, DIN and JASO, and many others. Transient Specialists, conveniently located in the mid-west, offers a variety of EMC test equipment rentals to accommodate your testing needs. Our rentals include technical support on the equipment, weekly and monthly ...

Radio Shack Has Some Good Prices on Clearance Items

Radio Shack Still Open for Business - RF CafeBelieve it or not Radio Shack is still open for business both online and in some brick and mortar locations. They have some really good prices on clearance (aka going out of business) parts that you might need. I just ordered some connector adapters, coin cell batteries, and antenna mount kit for dirt cheap. Shipping is free for a minimum $39 purchase. Use coupon code RADIO15 to get an additional 15% discount ...

Anatech Electronics Newsletter - March 2018

Anatech Electronics Newsletter for March 2018 - RF CafeAnatech Electronics, a manufacturer of RF and microwave filters, has published its February newsletter. In it, Sam Benzacar notes the impressive of rapid transformation of T-Mobile from virtual insignificance in the wireless world to the top of the hill. He cites Open Signal's January 2018 report titled, "State of the Networks: USA" as evidence. Sam offers his take on the reason for T-Mobile's success and for why Verizon and AT&T fell behind. As usual, it's a worthwhile read ...

The Connubially-Oriented Computer of Otto Tronix

The Connubially-Oriented Computer of Otto Tronix, July 1966 Popular Electronics - RF CafeAdmittedly, I needed to look up the meaning of "connubial" when seeing the title of this tongue-in-cheek article by Carl Kohler in the July 1969 issue of Popular Electronics magazine. Nobody knows for sure whether the over-enthusiastic starring male in the series of techie stories that ran in Popular Electronics magazine in the 1950s was actually Carl himself or an alter ego version of himself. Carl was also the artist of numerous tech-related comics. This episode deviates a bit from the already-married type to report on the exploits of born loser Otto Tronix ...

Group Delay Measurements with Signal and Spectrum Analyzers

Group Delay Measurements with Signal and Spectrum Analyzers - RF CafeThe available bandwidth of RF channels are often limited by the bandpass characteristic of filters, amplifiers and mixers. Detecting amplitude flatness and phase distortion is crucial in characterizing the quality of a transmission channel. The amplitude flatness within the used bandwidth may have an influence on the signal quality. Knowledge about phase distortion is essential to maintain low bit error rates in data transmissions and VNAs commonly perform amplitude flatness and phase distortion measurements ...

A New Way to Gauge Growth of Nanowires

A New Way to Gauge Growth of Nanowires - RF Cafe"In a new study, researchers from the U.S. Department of Energy's (DOE) Argonne and Brookhaven National Laboratories observed the formation of two kinds of defects in individual nanowires, which are smaller in diameter than a human hair. These nanowires, made of indium gallium arsenide, could be useful for a wide range of applications in a field scientists have termed optoelectronics, which encompasses devices that work by converting light energy into electrical impulses. Fiber optic relays are a good example ..."

Microwave Power Diodes

Microwave Power Diodes, July 1969 Electronics World - RF CafeEveryone who is interested enough in microwave diodes to read this article surely knows* what IMPATT, GUNN, and PIN diodes are, but have you heard of Read-effect, TRAPATT, LSA, or QMD diodes? If not, it is likely because you entered the microwaves field long after 1969 when this edition of Electronics World was mailed to subscribers. Device improvement and obsolescence accounts for familiarity with the former and unfamiliarity with the latter, respectively. The article below by two Sylvania Electronic Products engineers describes the properties of various up-and- ...

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

Mayors vs. the FCC

International Space Station Astronauts Calling "CQ Students"

AT&T Deal Raises Questions About Value of 5G Spectrum

Southwire Recalls Wi-Fi Switches Due to Fire Hazard

Former Qualcomm Chairman Reportedly Seeks Financing to Buy Company

MPs Summon Mark Zuckerberg and Accuse Facebook of Misleading Them

Wolfspeed Buys Infineon's Radio Frequency Power Business

Navi Mumbai Becomes Fastest 4G City in India

Selling to Telcos in the Age of Digital Transformation

Receiving Antennas for the Radio Amateur

Receiving Antennas for the Radio Amateur - RF CafeHere is a brand new book being offered by the ARRL: Receiving Antennas for the Radio Amateur, by Eric P Nichols (KL7AJ). "Although the fundamental characteristics of antennas apply to both transmission and reception, the requirements and priorities of receiving antennas can be vastly different from those of transmitting antennas. Receiving Antennas for the Radio Amateur focuses entirely on active and passive receiving antennas and their associated circuits. There are relatively few cases where a radio amateur ..."

5G to Alter RF Front-End Landscape

5G to Alter RF Front-End Landscape - RF Cafe"While the mobile industry is done with its annual Mobile World lovefest - held last month in Barcelona - tech suppliers, system OEMs, and mobile operators now face a host of 5G obstacles not yet overcome. In fact, they’re just getting started. The technical issues of 5G are manifold. Among them, smart antennas and RF front ends for 5G mmWave - typically expected to operate at frequencies such as 28 GHz, 39 GHz, or 60 GHz - could seriously affect the performance of yet-to-emerge 5G mmWave mobile phones ..."

High Exposure Advertising Plan Now Includes a 728x90-px Banner

High Exposure Advertising Plan Now Includes a 728x90-px Banner - RF CafeIn an ongoing effort to provide the best return on investment to RF Cafe website sponsors (aka advertisers), I have decided to allocate the 728x90-pixel banner ad slot at the bottom of all web pages to companies who participate in the High Exposure plan. That is in addition to the other features that have always been included. The cost is still only $150 per month; i.e., no price increase. A full list of advertising options is available on the Sponsorship Rates page, but just the features which are part of the High Exposure plan are highlighted in the screen capture ...

What Is the Role of Satellite Communications in 5G?

What Is the Role of Satellite Communications in 5G? - RF Cafe"Satellite communications have been in use for decades now, providing connectivity to remote areas, acting as backup in disaster relief situations, and being a major access mechanism for TV in certain parts of the world. Satellite use has been vital for government, military, and remote operations, while geostationary orbit (GEO) satellites are providing global coverage for voice, TV, and, in some cases, broadband Internet services. The telco industry is now working toward the standardization and commercialization of the next generation of cellular standards ..."

Electrochemistry Quiz

Electrochemistry Quiz, March 1966 Popular Electronics - RF CafeA lot of RF Cafe visitors might not be familiar with some of the electronic devices presented in this Electrochemistry Quiz by Popular Electronics' resident quizmaster, Robert Balin (a big list of his other quizzes is at the bottom of the page). I offer my assistance. A is a photocell, B is an early type of rectifier, C is a varistor, D is a cathode ray tube (CRT), E is an electrolytic capacitor, F is a heated cathode in a vacuum tube, G is a flashlight battery, H is an early receiver crystal detector, I is a magnetic audio recording tape, and J is phonograph cartridge. I scored ...

Codan Radio Communications in the Arctic

Codan Radio Communications in the Arctic - RF Cafe"During Exercise Northern Warrior 2018, 35 Canadian Brigade Group (35 CBG) Communications Detachment did an impressive job of testing and solving problems. The detachment's two objectives were to provide high-quality communications to the Arctic Response Company Group (ACG) personnel and test new equipment in an arctic environment. 'The arid and austere environment of the Canadian Arctic requires effective communications. The work done by the G6 35 GBC team has undoubtedly demonstrated the relevance of the HF communications that are essential to operate effectively in this hostile climate ..."

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Kirt Blattenberger