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"Competition brings out the best in products and the worst in people." – David Sarnoff
Today in Science History

Please Visit Triad RF Systems to Thank Them for Their Support

Triad RF SystemsTriad RF Systems designs and manufactures RF power amplifiers and systems. Triad RF Systems comprises three partners (hence 'Triad') with over 40 years of accumulated knowledge of what is required to design, manufacture, market, sell and service RF/Microwave amplifiers and amplifier systems. "We view Triad more as a technology partner than a vendor for our line-of-sight communications product line." Please check to see how we can help your project ...

ConductRF D38999 Standard & Custom RF Solutions to 65 GHz

ConductRF D38999 Standard & Custom RF Solutions - RF CafeConductRF is offering standard D38999 RF coaxial cable assembly configurations with RF Contacts including; BMA to 20 GHz SMPM to 60 GHz Size #8 to 18 GHz Size #12 Mil-Spec. Size #16 Mil-Spec. Cable choice include Low Loss Flexible and standard RG styles. Custom marking and also ruggedization coverings including Nomex weave available ...

Qualcomm, ZTE, China Mobile Demo End-to-End 5G NR Interoperability Test

Qualcomm, ZTE, China Mobile Demo End-to-End 5G NR Interoperability Test"Qualcomm, China Mobile and ZTE combined their 5G expertise and demonstrated what's being described as the world's first end-to-end 5G New Radio (NR) Interoperability Data Testing (IoD) system with a data connection based on 3GPP Release 15. Conducted at China Mobile's 5G Joint Innovation Center, the demo used ZTE's 5G NR) system with a data connection based on 3GPP Release 15. Conducted at China Mobile's 5G Joint Innovation Center, the demo used ZTE's 5G NR) system with a data connection based on 3GPP Release 15. Conducted at China Mobile's 5G Joint Innovation ..."

Anatech Electronics November Product Update

Anatech Electronics Product Update November 14, 2017 - RF CafeAnatech Electronics offers the industry's largest portfolio of high-performance standard and customized RF and microwave filters and filter-related products for military, commercial, aerospace and defense, and industrial applications up to 40 GHz. Anatech has introduced a two new filters and a gas tube surge arrestor for your convenience: a surface mount 32.0 MHz SAW filter, a leaded 1.25 MHz crystal filter, and a cool-looking DC-3 GHz gas tube surge arrester with SMA connectors ...

UK Government Launches Year of Engineering

UK Government Launches Year of Engineering to Inspire - RF Cafe"UK government launches Year of Engineering campaign to inspire next generation of engineers. The UK government has pledged to work with hundreds of industry partners throughout 2018 to encourage young people and their parents to take a closer look at engineering. Launched in response to an estimated shortfall of 20,000 engineering graduates a year, and growing reports from industry that the skills shortage is having a significant impact on productivity and growth the so-called 'Year of Engineering' hopes to galvanise ..."

Reflections on the News, February 1969 Electronics World

Reflections on the News, February 1969 Electronics World - RF CafeReading through the news items in the vintage electronics magazines provides a mixture of important historical facts and figures along with some predictions on the future of the industry. Some of the predictions turn out to be amazingly accurate, even though in retrospect they might seem obvious. Take, for example, Sylvania VP Dr. Robert Castor's foresight about how, "the future growth of the semiconductor industry lies in a major switch from the production of individual components to solid-state subsystems that can be used as building blocks in electronic designs." "Well of course," you might be temped to say; however, at the time there were still significant hurdles to overcome related to material ...

IBM Offers 20-Qubit Quantum Computer to Clients

IBM Offers 20-Qubit Quantum Computer to Clients - RF Cafe"IBM quantum computers with 20 superconducting qubits will soon be available for online use by the firm’s clients – according to the US-based company. The quantum systems will be running by the end of 2017 and IBM also says that it has built and tested a prototype quantum computer with 50 qubits. Part of the IBM Q family of quantum computers, the new systems are based on transmon qubits. These store quantum information in terms ..."

Apologies - No E-Mail Address Change After All

Earthlink offered a deal on keeping my original e-mail address, so I will be retaining the long-time after all. Please ignore the previously announced address. I apologize once again for any inconvenience. Please change your records as needed. Thank you.

Fisker Claims e-Car Breakthrough with 1 Minute Charge for 500 Miles

Fisker Claims Electric Car Breakthrough with a Minute Charge for 500 Miles - RF Cafe"The Danish automotive designer behind cars like the Aston Martin V8 Vantage and the BMW Z8 re-launched his electric car startup this year and announced that the next car out the gate would be powered by a 'breakthrough' in solid state batteries, one with a range of 500 miles and a charge time of one minute. Originally, Fisker and his team were intending to use a brand new graphene-based hybrid supercapacitor technology but eventually settled on the standard lithium-ion instead. However ..."

Farewell and Adieu, H. Ward Silver

Farewell and Adieu, H. Ward Silver - RF CafeAnother era, sadly, has come to an end. H. Ward Silver (aka Ward Silver, NØAX) has announced the end of his monthly column, "Hands-On Radio," in QST magazine. The title of each column was enumerated as "Experiment #nnn," followed by the subject. To wit, "Experiment #179 Maxwell's Equations - The Wave Emerges" is Mr. Silver's final column, appearing in the December 2017 QST. "Hands-On Radio" topics ranged in intensity from relatively simple discussion on calculating power dissipation in resistors, capacitors, and inductors to more heady treatises on subjects like electromagnetic fields within coaxial cable and waveguide to Maxwell's equations. Mathematics, too ...

Solid-State LSA Microwave Diodes

Solid-State LSA Microwave Diodes, February 1969 Electronics World - RF CafePrior to the advent of high frequency solid state devices like Gunn diodes, working at or above a couple GHz - even at low power - required the use of cavity oscillators such as klystrons and magnetrons. They were bulky, espensize and electrically very inefficient. This article outlines the theory of bulk oscillators as developed by Dr. John A. Copeland, of Bell Labs, and points out the peculiarities of the LSA (limited space-charge accumulation) mode that makes it possible to obtain 20 milliwatts of power at 88 GHz. Use of gallium arsenide (GaAs) enabled designers to construct receiver circuits into the mm-wave region without the need for klystrons, thereby reducing cost ...

'Twisted' Light Could Illuminate New Path for Wireless Communications

'Twisted' Light Could Illuminate New Path for Wireless Communications - RF Cafe"Scientists have taken an important step towards using 'twisted' light as a form of wireless, high-capacity data transmission which could make fiber optics obsolete. Scientists can 'twist' photons - individual particles of light - by passing them through a special type of hologram, similar to that on a credit card, giving the photons a twist known as optical angular momentum. While conventional digital communications use photons as ones and zeroes to carry information, the number of intertwined twists in the photons ..."

Free Engineering Magazines for Qualified Engineers & Technicians

Engineering White Papers & Books, November 2017 - RF CafeWhitepapers, pamphlets, books, magazines, and chapter examples listed here are a small sample of a lot of new items that are offered for FREE to qualified users through TradePub. 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 (literally) when you download one of these or the many other pubs available, so please help yourself ...

SIA 'Encouraged' by FCC Order on Bands Above 24 GHz

SIA 'Encouraged' by FCC Order on Bands Above 24 GHz - RF Cafe"So far, the FCC appears to have struck a balance between the goals of terrestrial wireless and satellite interests, at least based on early reads of the millimeter wave spectrum item it passed at its open meeting Thursday. The Satellite Industry Association (SIA) announced that it is initially encouraged by the FCC order regarding the future deployment of wireless services in spectrum bands above 24 GHz. In a news release, the FCC stated it will adopt rules regarding the use of spectrum ..."

Thanks Once Again to Electro-Photonics for Continued Support!

Electro-PhotonicsElectro-Photonics LLC is a global supplier of RF & Microwave components. Our products include SMT hybrid and directional couplers, wire bondable passive components, filters, and very useful test boards for evaluating components (spiral Electro-Photonics components - RF Cafeinductors, single-layer capacitors). The Electro-Photonics team can support your small R&D design requirements with RF & Microwave test fixtures and save you valuable design and characterization time. Please take a moment to visit their website and see how your project might benefit ...

Innovations in Jammer Technologies

Empower RF Systems Seminar: Pulse Shaping in High Power Solid State Jamming Amplifiers - RF CafeWebinar Title:  Pulse Shaping in High Power Solid State Jamming Amplifiers When: Thursday, November 30, 12 pm to 1:30 pm Location: Marriott Marquis Hotel Marquis Ballroom. Pulse shaping, as it is done today, is an effort to fix fidelity issues caused by the transmitting amplifier and is accomplished by a combination of imperfect methods, most external to the amplifier. In this technical session, Paulo Correa will describe a new high power amplifier architecture with built in real time feedback that is capable of matching the input signal shape, minimizing droop, overshoot, ringing, rise ...

RF Cafe Engineering Crossword w/Headlines:  November 19

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines November 19, 2017For the sake of avid cruciverbalists amongst us, each week I create a new technology-themed crossword puzzle using only words related to engineering, science, mathematics, chemistry, physics, astronomy, etc. At least 10 clues in this puzzle with an asterisk (*) are pulled from this past week's (11/13 - 11/17) "Tech Industry Headlines" column on the RF Cafe homepage (see the Headline Archives page for help). Enjoy! ...

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

ARRL Headquarters Closed for Thanksgiving on November 23 & 24

FDA Approves World's First Pill with Embedded Sensor

Radio Amateurs in Colombia, Germany Get New or Expanded Bands

New Firefox Runs Like a Rabbit (I'm a FF user)

Renaissance of the Iron-Air Battery

Our Love Affair with Digital Is Over

AT&T Calls for Quick Auction of 28 GHz and 37-40 GHz Bands

Why Hot Water Freezes Faster Than Cold Water (I thought that was a myth)

GaN Reveals Another Secret

China Reserves Spectrum for 5G

Please Welcome QuinStar Technology as Our Newest Supporter!

QuinStar Technology mm-Wave Products - RF CafeQuinStar Technology designs and manufactures mm-wave products for communication, scientific, and test applications along with providing microelectronic assembly, rapid prototyping, and mass customization. • Amplifiers • Receivers • Oscillators • Switches • Attenuators • Circulators • Isolators • Filters • Waveguide • Antennas • Phase Shifters • Transceivers • Radar Subsystems • Mixers • Detectors • Transducers. QuinStar specializes in cryogenic amplifiers, circulators, and isolators. Please visit QuinStar today to see how they can help your project ...

Antenna Design for a Connected Home Multimedia Device

Antenna Design for a Connected Home Multimedia Device - RF Cafe
Free webinar title: "Antenna Design for a Connected Home Multimedia Device." When: November 21, 11:00 am EST. Presenter: Dr. Marc Rütschlin. "As the Internet of Things establishes itself, more and more connected devices are finding their way into the modern home. The 'connections' are of course wireless and antennas are the key enabling technology which provides that wireless connectivity. This webinar will discuss the case of a smart projector, exploring how antennas can be designed given the ..."

Tips for Technicians - by Mallory Capacitors

Tips for Technicians, February 1969 Electronics World - RF CafeAkin to how the National Company ran a long series ( a couple hundred altogether) of infomercial type ads in the ARRL's QST magazine from the 1930s through the 1950s, Mallory had its "Tips for Technicians" run in Electronics World (and maybe other electronics magazines of the era). Being a major capacitor manufacturer, its ads featured brief tutorials on various types of capacitors, their characteristics, and how they should be used in circuits - both for new design and when replacing capacitors in existing equipment ...

Vintage Radio Receiver Service Data Sheets - Final Installment

Stromberg-Carlson 10 Tube No. 82 All-Wave Receiver Radio Service Data Sheet, September 1935 Radio-Craft - RF CafeWell, these are the last three Radio Service Data Sheets I have from my collection of vintage electronics magazines. That makes a total of 219 that I have scanned and posted over a span of 3 years. At some point I will bid for other editions on eBay. They can cost $5 or more apiece, so the cost adds up quickly.
Remler Model No. 36 6-Tube Dual-Wave Auto-Radio
Stromberg-Carlson 10 Tube No. 82 All-Wave Receiver
Fada Model 155 5-Tube Super Fadalette A.C.-D.C. Set

MegaPhase Names Maddiel Gonzalez as Engineering Manager

MegaPhase Names Maddiel Gonzalez as Engineering Manager - RF CafeMegaPhase, a leading provider of RF and microwave interconnects, is pleased to announce that Maddiel Gonzalez has joined the MegaPhase Team as Engineering Manager. Maddiel's career has involved developing state-of-the-art RF connectors for space, military and commercial applications. Maddiel led a team of technical staff in the design of RF Interconnect products in his prior position at another cable and connector company. His design ...

New on RF Cafe: Online Sudoku Puzzle

{Easy} Online Sudoku Puzzle - RF CafeGiven the popularity of working Sudoku puzzles, I figured it was about time to include them on RF Cafe. These use embedded JavaScript code to make them playable online. 4 levels of difficulty can be chosen, depending on your ability. Sudoku (so͞o dōko͞o') puzzles, despite their Japanese name, were not actually invented in Japan. According to the history note in Wikipedia, they first appeared in France, and then popularized in America. Regardless of its origins, Sudoku is an immensely popular game today ...

Brig. General David Sarnoff Memorial - The End of an Era

Brig. General David Sarnoff Memorial - The End of an Era, March 1972 Popular Electronics - RF CafeBrigadier General David Sarnoff's name was well known to most people in the realm of communications up to the time of his death in 1971. His technical and leadership skills were recognized and rewarded throughout his very accomplished lifetime in both military and civilian venues. This brief biography of Sarnoff was printed in the March 1972 issue of Popular Electronics magazine. As with many people of high acclaim, he had a few run-ins with other notable people during his career - the most famous of which was the Battle of the Airwaves fought between Edwin Armstrong and him over FM versus AM ...

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Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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