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

Today in Science History

Many Thanks to Nova Microwave for Continuing Support!

Nova Microwave circulators & isolatorsNova Microwave is a leader in technically differentiated electronic and radio frequency Ferrite Circulators and Isolators that connect, protect and control critical commercial and military wireless telecommunications systems. Our staff is dedicated to research and development of standard and custom design quality Ferrite Circulators and Isolators from 380 MHz to 26.5 GHz. Please visit Nova Microwave today ...

Keysight Demos Simulation, Measurement at EPEPS 2017

Keysight Technologies Demonstrates Advances in High-Frequency Simulation, Measurement Solutions at EPEPS 2017 - RF CafeKeysight Technologies will showcase the latest releases of its high-frequency simulation and measurement tools at the electrical performance of electronic packaging and systems 2017 (EPEPS 2017) conference, the premier event for advanced and emerging issues in electrical modeling, analysis and design of electronic interconnections, packages and systems. Keysight will demonstrate the following new software capabilities at the event ...

Advanced Multipoint Radios Exceed Customer Capacity Expectations

Exceeding Customer Capacity Expectations with Advanced Multipoint Radios - RF Cafe"Over the last 10 years Comsol has grown from providing Integration solutions to providing fully managed wireless services. This new market offering has allowed our customers to no longer invest in specialized wireless infrastructure which creates strain on their balance sheet but, rather, to buy an all-in connectivity service from Comsol and build this into easily managed OPEX budgets ..."

Automotive Radar Simulation Webinar

Hassan Chreim Automotive Radar Seminar - RF CafeOctober 26, 11:00 am to 12:00 pm EST. Presenter: Hassan Chreim. CST Webinar Series: Automotive radar is becoming increasingly important for car designers, due to the huge role it plays in securing and ensuring the driver's safety. In this webinar, we will show how CST STUDIO SUITE can be used to perform and study all of the design stages of automotive radars, starting from the basic element which is the antenna, through its integration inside a radome, to actually placing and calibrating the whole package ...

ConductRF RF Test Cables for Field Engineers

ConductRF RF Test Cables for Field Engineers 10/17/2017 - RF CafeConductRF's SiteFlex Range of ruggedized Field RF Test Cables are designed Field Test Engineers working in applications that require on site RF Testing. These cables are directly compatible with Hand-Held Network and Spectrum analyzers. Options include DC to 7 GHz through DC to 50 GHz. The ruggedized construction includes anti-torque connectors that are firmly attached to the cables external armor. Crush resistant SF series cable can withstand 1,200 lbs/sq.in ...

Quantum Spin Current Detection Potential for Alternative Electronics

Spin Current Detection in Quantum Materials Potential Alternative Electronics - RF Cafe"A new method that precisely measures the mysterious behavior and magnetic properties of electrons flowing across the surface of quantum materials could open a path to next-generation electronics. Found at the heart of electronic devices, silicon-based semiconductors rely on the controlled electrical current responsible for powering electronics. These semiconductors can only access the electrons' charge for ..."

Printed-Circuit Kits for Short Runs

Printed-Circuit Kits for Short Runs, October 1969 Electronics World - RF CafePrinted circuit boards (PCBs), especially high density and many layered, were still a relatively new technology in 1969. Point-to-point wiring was still a large part of most products in the commercial, military, industrial, and aerospace worlds. Producing artwork and contracting for a lot of PCBs was rather expensive, especially in small quantities. Many people, including me, made quite a few single- and two-sided boards using photoresist pens and self-adhesive tape and pads, then bathing them in an etchant solution of ferric chloride. Through holes were made on a drill press and then traces and pads were tinned with flux and solder ...

Nokia Plans to Conduct 90-96 GHz Tests

Nokia Plans to Conduct 90-96 GHz Tests - RF Cafe"At a time when much of the industry's attention has been on midband spectrum, Nokia is taking it up a notch by pursuing tests in the 90-96 GHz range. The vendor filed an application with the FCC asking for permission to conduct the tests over the course of two years at Nokia facilities in Murray Hill, New Jersey; Arlington Heights and Naperville, Illinois; and Sunnyvale, California. The application ..."

Teardowns Explore Bluetooth, Cellular IoT

Teardowns Explore Bluetooth, Cellular IoT - RF Cafe"TechInsights explored some of the Bluetooth and cellular IoT devices that it expects will dominate the Internet of Things for some time. Bluetooth 5.0 SoCs will be rapidly adopted by consumer IoT devices such as smartwatches and health and fitness products. Two emerging cellular IoT standards - narrowband IoT (NB-IoT) and Enhanced Machine-type Communications (eMTC) - will see wide applications in smart meters, bikes and other new emerging ..."

Electrons Under Extreme Conditions Described for 1st Time

Electron Behavior Under Extreme Conditions Described for 1st Time - RF Cafe"Researchers have modeled the actions of electrons under extreme temperatures and densities, such as those found within planets and stars. The work could provide insights into the behavior of matter in fusion experiments, which may one day lead to a sought-after source of clean energy. Electrons are an elementary component of our world and determine many of the properties of solids and liquids ..."

The How and Why of the SCR

The How and Why of the SCR, November 1972 Popular Electronics - RF CafeDid you know that General Electric introduced the first silicon-controlled rectifier (SCR) for commercial use? It was in 1957. The SCR was one of the first really high power devices in the semiconductor industry, not for its voltage and power gain, but for its ability to switch very large currents on and off while having a relatively low "on" voltage drop. This article gets into the basic theory, operation, and application of the SCR. The S-band airport surveillance radar that I worked on in the USAF originally used a vacuum tube thyratron to trigger the magnetron's pulse forming network, but that tube was replaced with a solid state SCR circuit that plugged directly ...

Hurricane Maria Scrambled Puerto Rico's Humacao Solar Plant

Hurricane Maria Scrambled Puerto Rico's Humacao Solar Power Plant - RF Cafe"After the destruction inflicted across the Caribbean by hurricanes Harvey, Irma, and Maria, renewable energy advocates are calling for a rethink of the region's devastated power systems. Rather than simply rebuilding grids that delivered mostly diesel generation via damage-prone overhead power lines, renewables advocates argue that the island grids should leapfrog into the future by interconnecting hundreds or thousands of self-sufficient solar microgrids ..."

Notable Tech Quote: H. Ward Silver

H. Ward Silver, Notable Tech Quote - RF Cafe"I don't know the last time you purchased some new coax, but it's sold by the foot and can cost an arm and a leg!" - H. Ward Silver, QST magazine, October 2017, Hands-on- Radio (p71). 

Fuses for Electronics

Fuses for Electronics, July 1972 Popular Electronics - RF CafeDeciding which fuse to use as a replacement for a blown fuse is usually a simple matter - read the part number or electrical parameters (current, voltage) off the package and make sure of its type (fast or slow blow). Of course whenever a fuse blows, you usually have more or a problem than just a bad fuse. Deciding which fuse to use when designing a circuit which requires overcurrent protection requires a lot more consideration. This article from fuse making company Bussmann's Charles James gives a brief introduction to the kinds of parameters you need to factor into a selection. There's more to it in most cases - especially ...

Qualcomm Gets OK to Conduct 4.4-4.94 GHz 5G Tests in San Diego

Qualcomm Gets OK to Conduct 4.4-4.94 GHz 5G Tests in San Diego - RF Cafe"Qualcomm was granted FCC authorization to conduct experiments using a small 5G R&D development and demonstration network at 4.4-4.94 GHz in its hometown of San Diego. Specifically, the location is within a 0.5-mile radius of Qualcomm's campus in the Sorrento Valley area of San Diego. The authorization is effective until October 1, 2019. The application lists 30 mobile units and four base stations to be used in a test network that will use a single TDD 100 MHz channel ..."

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Advertise on RF Cafe

RF Cafe typically receives 30,000-40,000 page views each weekday and about half that on weekends. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 8,600 pages in the Google search index, RF Cafe returns in favorable positions on many types of keyword searches, both for text and images. New content is added on a daily basis. Advertising plans start at a mere $35 per month ...

MILCOM 2017 - October 23-25, Baltimore, Maryland

MILCOM 2017 (October 23-25, Baltimore) - RF Cafe"Now in its 36th year, MILCOM continues to be the premier international conference for military communications. At MILCOM, global military communications professionals face command, control, communications, computing, intelligence, surveillance and reconnaissance (C4ISR) challenges head on. They look at them from every angle and discuss them from end to end - research and development through future needs. The conference allows industry the opportunity to hear and understand the requirements, pace of change and state of play in a variety of C4ISR ..."

Many Thanks to Res-Net Microwave for Continuing Support!

Res-Net Microwave componentsRes-Net Microwave has a complete line of precision RF & microwave components including attenuators, terminations, resistors, and diode detectors for commercial, military, and space applications. Products range from the small flange type to large 2 kW connectorized power attenuators and/or terminations at frequencies up to 26.5 GHz. In-house photo etch and laser trim capability. Please check out Res-Net Microwave's website to see how they can help with your current project ...

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

U.S. Tech Giants May Find Their Future Shaped by Europe

Caribbean Telecommunications Union Head Calls for "New Generation" of Hams

FCC Further Extends Waiver on RF Equipment Information Collection Requirements

Vodaphone Says EU Could Learn from India on Spectrum Allocation

iPhone 7 Selling Faster Than iPhone 8

Semi Market Will Be Worth $411B This Year

How to Manage Semiconductor Tool Obsolescence

Taiwan Hits Qualcomm with $773M Antitrust Fine

Qualcomm Files Patent Lawsuits Seeking iPhone Sales Ban in China

Chip Sales Forecasts Lifted Again

'Krack' Hack Attack Threatens Every Wi−Fi Network

'Krack' Hack Attack Threatens Every Wi-Fi Network - RF Cafe"Every Wi-Fi connection is potentially vulnerable to an unprecedented security flaw that allows hackers to snoop on internet traffic, researchers have revealed. The vulnerability is the first to be found in the modern encryption techniques that have been used to secure Wi-Fi networks for the last 14 years. The so-called 'Krack' attack has been described as a “fundamental flaw” in wireless security techniques by experts. Apple, Android and Windows software are all susceptible to some version ..."

First American Made Quartz Watch

First American Made Quartz Watch, March 1972 Popular Electronics - RF CafeThis Bulova Accuquartz wristwatch is not the first quartz-controlled wearable timepiece; however, it was the first to be manufactured in the U.S. Interestingly, it is not a fully electronic watch because the quartz crystal stimulates a mechanical tuning fork which ultimately drives the hands. Bulova's first tuning-fork-driven "Accutron" was introduced in 1960. It sported a 360 Hz tuning fork that was stimulated by a pair of electromagnets ...

Many Thanks to everythingRF for Long-Time Support!

everything RFPlease take a few moments to visit the everythingRF website to see how they can assist you with your everythingRF products - RF Cafeproject. 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 ...

Keysight's Corporate HQ Damaged in California Wildfires

Keysight's Corporate HQ Damaged in California Wildfires - RF CafeUpdate: "The corporate headquarters of test company Keysight Technologies is shut down and suffered minor damage in the wildfires that have wiped out parts of Santa Rosa, California. Although a local news report claimed that the campus had been destroyed, the most recent update from the company said that as of Monday afternoon, 'all four main buildings are intact, although there appears to be some minor damage. Two modular structures and several automobiles suffered more ..."

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines October 15

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines October 15, 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 (10/9 - 10/13) "Tech Industry Headlines" column on the RF Cafe homepage (see the Headline Archives page for help) ...

Wireless Temperature Sensor Having No Electrical Connections

Wireless Temperature Sensor Having No Electrical Connections - RF Cafe"Robust, flexible, wireless temperature sensor based on SansEC. NASA Langley Research Center has developed a robust, wireless temperature sensor that does not require an electrical connection. The temperature sensor is built on NASA's SansEC sensor platform, which takes advantage of measuring dielectric changes. The temperature sensor is damage tolerant, wireless, flexible, precise, and inexpensive. One promising application is for tire temperature ..."

Mac's Service Shop: Fix It or Junk It?

Mac's Service Shop: Fix It or Junk It?, September 1969 Electronics World - RF CafeThere are not too many honest-to-goodness electronics repair shops around anymore - those where the proprietor uses multimeters, oscilloscopes, and signal generators to troubleshoot and align equipment. In fact, I would guess that most such shops do most of their business based on customers who find their services as the result of a Google search. You can find lots of cool videos of technicians demonstrating (and showing off) their collection of test equipment and solder rework stations - mostly for fixing vintage audio and video gear. Nowadays the smartphone screen replacement dude / dudette working from a kiosk in the shopping mall is considered an electronics ...

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Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
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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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