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Homepage Archive - March 2020 (page 3)

See Page 1 | 2 | 3 | 4 | 5 | of the March 2020 homepage archives.

Friday 20

Crosley TV Advertisement

Crosley TV Advertisement, April 1954 Radio & Televsion News - RF CafeYou wouldn't know it from the lineup of Crosley Corporation radios and turntables appearing in department stores, but the company also manufactures dishwashers, ranges and freezers, clothes washers and dryers, and air conditioners. That is still a small chunk of what Crosley, based in Cincinnati, Ohio, made back in the middle of the last century, including cars and trucks, a small private airplane (the Moonbeam), television sets and even had a television broadcast station, as well as other items that were part of the mainstream of American life. Take a look at their About Crosley webpage for more insight. Amazingly, along with the extensive line of retro radios and turntables, they still also make a few models of full-size jukeboxes. This full-page advertisement for Crosley TVs appeared in a 1954 issue...

Amateur Radio Satellite for Beginners

Amateur Radio Satellite for Beginners - RF CafeSteve Ford, WB8IMY,  author of the monthly "Eclectic Technology" QST magazine column, has just published a book entitled, "Amateur Radio Satellite for Beginners." You can make contacts through amateur radio satellites, and even with the International Space Station, using equipment you probably own right now! All it takes is the right information, which you'll find in this book. There are dozens of spacecraft in orbit just waiting for your signals, and more are being launched every year. This book is your guide to a whole new world of operating enjoyment. Inside you will: Be able to locate satellites and determine when they will be available in orbit. Gain tips for building your own satellite station even if it s just a dual-band FM transceiver and a mobile antenna. Discover satellite antenna projects you can build at home...

NEW - RF & Electronics Symbols for Visio

RF Electronics Wireless Analog Block Diagrams Symbols Shapes for Visio - RF CafeWith more than 1000 custom-built symbols, this has got to be the most comprehensive set of Visio Symbols available for RF, analog, and digital system and schematic drawings! Every object has been built to fit proportionally on the provided A-, B- and C-size drawing page templates (or can use your own). Symbols are provided for equipment racks and test equipment, system block diagrams, conceptual drawings, and schematics. Unlike previous versions, these are NOT Stencils, but instead are all contained on tabbed pages within a single Visio document. That puts everything in front of you in its full glory. Just copy and paste what you need on your drawing. The file format is XML so everything plays nicely with Visio 2013 and later...

Sally, the Service Maid: The Case of the Silent Speaker

Sally, the Service Maid: The Case of the Silent Speaker, April 1944 Radio-Craft - RF CafeSally Mason was the soldering iron-wielding heroette (heroine sounds too much like the narcotic) of Nate Silverman's "Sally, the Service Maid" series that ran in Radio-Craft magazine during the years of World War II. As I noted in the previous episode, many of the nation's women were left behind to run their husband's, father's and/or son's electronics sales and repair businesses when they went off to save the world from aggressive Communists, Socialists, Maoists, Nazis, and other nasty types. Some of those ladies had already become very adept at troubleshooting, component replacement, and aligning radio and television sets, while some were left to learn at the School of Hard Knocks. Sally's father, Gus Mason, as far away teaching electronics to Signal Corpsmen for the war effort. Her years of looking over Dad's shoulder and hanging around the shop was paying off...

Reconfigurable Electronics Offer Promise for Implantable Devices

Reconfigurable Electronics Offer Promise for Implantable Devices - RF Cafe"Medical implants of the future may feature reconfigurable electronic platforms that can morph in shape and size dynamically as bodies change or transform to relocate from one area to monitor another within our bodies. Researchers from King Abdullah University of Science and Technology and the University of California, Berkeley report a silicon honeycomb-serpentine reconfigurable electronic platform that can dynamically morph into three different shapes: quatrefoils (four lobes), stars, and irregular ones. 'Quatrefoils can be used for rectangular object-based operation, while stars are for more intricate architectures, and irregular-shaped ones are specifically for implanted bioelectronics,' said Muhammad Hussain, co-author and a visiting professor at the University of California, Berkeley..."

White Paper Describes Design of Complete RF Downconverter

Cadence | AWR White Paper Describes the Design of a Complete RF Downconverter Module - RF CafeCadence | AWR has published a white paper entitled "Design of a Complete RF Downconverter Module for Test Equipment." RF / microwave modules integrate diverse technologies to address the challenge of developing cost-effective radio circuitry for low- to medium-volume production commonly used in T&M equipment and aerospace / defense applications. This white paper describes the design and simulation of a complete downconverter module used in spectrum analyzer test equipment. The example module and its constituent parts demonstrate a top−down / bottom−up approach using circuit- and system-level analyses. You may download a free copy...

ConductRF: Precision & Standard Grade RF Cable Assemblies

ConductRF coaxial cables & connectors - RF CafeConductRF is continually innovating and developing new and improved solutions for RF Interconnect needs. See the latest TESTeCON RF Test Cables for labs. ConductRF makes production and test coax cable assemblies for amplitude and phased matched VNA applications as well as standard & precision RF connectors. Over 1,000 solutions for low PIM in-building to choose from in the iBwave component library. They also provide custom coax solutions for applications where some standard just won't do. A partnership with Newark assures fast, reliable access. Please visit ConductRF today to see how they can help your project! 

Thursday 19

Impedance Matching of Multiple Speakers

Impedance Matching of Multiple Speakers, April 1954 Radio & Televsion News - RF CafeI have five operational radios and speakers spread around my house (912 ft2, BTW) and in the basement. Only one of them is newer than 20 years old and the others are circa 1978 or earlier. AM or FM over-the-air radio is playing all day (when the el cheapo BSR turntable isn't spinning LP and 45 vinyl). In a couple instances I feed a stereo output into a mono speaker. With truly stereo-separated audio, listening to just the right (R) or left (L) channel does not do an adequate job of replicating the broadcast since often, particularly in music, the voice tends to favor one or the other of R or L. Simply tying the right and left channels together does not do the job because the low impedance of the speakers - typically 4 Ω or 8 Ω - causes noticeable distortion when doing so. The only way to achieve good sound is to use a power combiner that presents the proper impedance to each component...

Navy Installs Laser Weapon on Destroyer USS Dewey

Navy Installs Laser Weapon on Destroyer USS Dewey - RF Cafe"Fitting laser weapons onto Navy destroyers is expanding across the fleet, to include the DDG 51 Flight III next-generation destroyers now in production. Enemy drones over the ocean could track and surviel U.S. Navy ships, designate targets for aircraft or maritime attacks, or even fire dangerous weapons themselves at surface ships. This reality is one of many key reasons the Navy has now installed a new counter drone 'dazzler' laser weapon aboard one of its destroyers for the first time, bringing new offensive and defensive warfare possibilities to the fleet. The Navy's Optical Dazzling Interdictor, or ODIN laser weapon, has been installed on the Navy destroyer USS Dewey, a report from Naval Sea Systems Command said."

Get Your Custom-Designed RF Cafe Gear!

Custom-Designed RF-Themed Cups, T-Shirts, Mouse Pads, Clocks (Cafe Press) - RF CafeThis assortment of custom-designed themes by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins, Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart." My "Matchmaker's" design has been ripped off by other people and used on their products, so please be sure to purchase only official RF Cafe gear. My markup is only a paltry 50¢ per item - Cafe Press gets the rest of your purchase price. These would make excellent gifts for husbands, wives, kids, significant others, and for handing out at company events or as rewards for excellent service. It's a great way to help support RF Cafe. Thanks...

Arbitrage via Microwaves

Arbitrage via Microwaves, McKay Brothers photo of microwave link - RF CafeWith the extreme volatility of today's stock market, I thought this might be a good time to re-post an article I wrote back in 2012 entitled "Arbitrage via Microwaves." The ±200 point daily swings of a mere 8 years ago seem paltry compared to ±1,000 of late. The original page on the IEEE Spectrum magazine website is dead now, so I had to change the hyperlink to an archived page on The Wayback Machine - a great resource for you to remember if you ever need to retrieve a webpage that has been disappeared [sic]. My piece begins: "If you have wondered why the world's stock markets behave the way they do, why the DJIA falls 150 points on one day on news of Greece leaving the euro, then gaining 200 points the next day on news of a bailout, then back down a day later on more news of the bailout, your confusion is understandable. It seems that there might be nobody who actually can predict the market's contortions...

E-Discovery, Privacy, and Cybersecurity Law

E-Discovery, Privacy, and Cybersecurity Law - RF CafeMr. Billy A., an affiliate of Purdue ("Parvoo," per Carl & Jerry") University's Concord Law School, sent me a link to an online article entitled, "E-Discovery, Privacy, and Cybersecurity Law." Along with introducing the concept, it also deals with "When E-Discovery Goes Wrong." The author begins: "During the pretrial discovery phase of litigation, parties in a dispute are required to produce information, documents, and other evidence related to the case. In an increasingly digital world, electronic discovery, or e-discovery, has become a critical component of this process. This refers to the discovery of relevant electronically stored information (ESI) such as emails, text messages, databases, images, and spreadsheets. Privacy and security are critical considerations during e-discovery due to the elevated risk of theft or leakage while data is transferred from one system to another. Because the process typically involves extremely sensitive information... "

"Sorry. Privacy is a thing of the past." - Martin Cooper

"Privacy is a thing of the past," Martin Cooper - RF CafeOn May 21st, 2010, in an interview with CBS News entitled, "The Cell Phone: Marty Cooper's Big Idea," cell phone inventor Martin Cooper, was asked, "Isn't there almost a Brave New World sensibility behind all of this being connected? What does it do to our privacy?" His reply: "Sorry. Privacy is a thing of the past." There are two aspects of that loss of privacy. One is the vulnerability of data collection by anyone with the technology (including Big Brother). The other aspect is loss of privacy by choice due to people blabbing all their business in public where anyone nearby can hear. The former is unavoidable by the cell phone user, while the latter is completely avoidable - and preferable, since almost nobody want to hear you yak about your personal business.

Copper Mountain Technologies: Vector Network Analyzers

Copper Mountain TechnologiesCopper Mountain Technologies develops innovative and robust RF test and measurement solutions for engineers all over the world. Copper Mountain's extensive line of unique form factor Vector Network Analyzers include an RF measurement module and a software application which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware via USB interface. The result is a lower cost, faster, more effective test process that fits into the modern workspace in lab, production, field and secure testing environments.

Wednesday 18

FM Radio Quiz

FM Radio Quiz, April 1950 Radio & Televsion News - RF CafeFM (frequency modulation) radio certainly was a hot topic beginning in the middle to late 1940s. With the war out of the way, energies and resources were being redirected back to peacetime production. Major Edwin Armstrong announced his FM scheme in 1935, and as with many new inventions, it was met with skepticism by many who doubted his claim of static interference immunity. For many, it was a lack of understanding that caused the negative reaction, caused primarily by the increased level of sophistication of the transmitter and receiver circuitry. Amplitude modulation (AM) was so easy even a caveman could understand it, but adding phase relationships into the equation (literally) left many in the dust. This FM Radio Quiz from a 1950 issue of Radio & Television News magazine tests your grasp of frequency modulation principles.

Apple to Patent Snoop-Proof Screens

Apple to Patent Snoop-Proof Screens - RF CafeThis is headline simultaneously both spooky and cool: "Apple to patent snoop-proof screens." The cool part is that it is possible. The spooky part is that it is possible. Per the description, the camera facing the user scans his/her/its (HHI) face and eyes to determine where HHI is currently viewing. Then, if another face is detected that the "Gaze-dependent display encryption" algorithm determines is an uninvited viewer, it blurs the screen everywhere except where the legitimate viewer is concentrating. That is an incredible application of face detection AI. Just imagine what court-admissible data could be stored or transmitted about your viewing habits once the phone knows it's you looking at it and not someone else! To wit: We know you were looking at your iPhone at the moment you ran over the old lady trying to cross the street.

Many Thanks to Lemos International Technologies for Continued Support!

Lemos International - RF CafeLemos International Technologies is both a designer and manufacturer of wireless products and a distributor of products from other world-class manufacturers. A modular approach to wireless connectivity helps eliminate much of the technical design and testing and also simplifies or eliminates the need for expensive conformance testing and certification. Ready-to-use Bluetooth, GPS, Wi-Fi, licensed and unlicensed band products are available. Custom design services can help you achieve success with your project's unique needs.

Amateur Radio Stations circa 1935

Amateur Radio Stations circa 1935 - RF CafeThose of you who are not particularly interested in vintage electronic equipment will please indulge those of us who are. I post these articles occasionally to remind people of from whence we have come. Whether you are an amateur radio operator or just a cellphone user, appreciation is due to the pioneers who took the metaphorical arrows for us so that we may enjoy the micro-size, low cost, high quality communications available today. The full-height equipment racks in the photos were standard fare in the 1930s for long distance (DX) shortwave operators - often only for CW (Morse code). "User serviceable parts inside' was the rule rather than the exception. As much as I like waxing nostalgic over tube-based hardware of yesteryear, I am quite grateful to be typing this note on a computer keyboard and not on a massive teletype machine...

U.S. FDA Summary Report on RF Radiation-Caused Cancer

U.S. FDA Summary Report on RF Radiation-Caused Cancer - RF Cafe"The U.S. Food and Drug Administration (FDA) has released a comprehensive report summarizing the results of more than 10 years of scientific and epidemiological studies on the potential adverse health effects of exposure to radiofrequency (RF) radiation. Published earlier this month, the report, entitled 'Review of Published Literature between 2008 and 2018 of Relevance to Radiofrequency Radiation and Cancer,' reviewed more than 125 peer-reviewed articles published between January 1, 2008 and mid-2018 to assess the possible causal relationship between exposure to RF radiation in the frequency range of 100 KHz to 6 GHz and the formation of cancerous tumors. The FDA's conclusion? 'There is insufficient evidence to support a causal association between RF radiation exposure and tumorigenesis...'"

ERZIA: Microwave & mm-Wave Modular Amplifiers

ERZIA Technologies - RF CafeERZIA serves critical aerospace and defense missions by designing and manufacturing RF, microwave, and mm-wave amplifiers, integrated assemblies operating from low frequencies up to 100 GHz, and by providing high reliable satellite communications. The company was founded in 2002 to become a worldwide reference of advanced engineering, performance, reliability and ruggedness. Their catalogue of standard amplifier modules comprises more than 100 different models, having also a high capacity of customization for amplifiers and integrated assemblies. Some of products have space heritage and are used in aerospace, commercial, military and scientific systems, having a wide range of final applications.

Tuesday 17

Finco TV Antenna Ad

Finco TV Antenna, March 1953 Radio-Electronics - RF CafeThe neighborhood where I grew up in the 1960s and 1970s was about 25 to 30 miles from the "big three" network television broadcast stations (ABC, CBS, NBC) in Baltimore and Washington, D.C. That is considered a fairly long distance in the over-the-air TV realm. Knowing what I know now, I am somewhat surprised that those in our area were able to receive programs as well as we did when all the homes I recall had just a single, standard multi-element antenna on the roof. If anyone had stacked, phased array setups like this Finco Co-Lateral TV Antenna installed, I certainly do not remember any. Most of the antennas in Holly Hill Harbor and the surrounding communities did not even have an antenna rotator, yet evidently were pulling in signals satisfactorily - and without needing to be mounted on a tall tower. That said, about the time I was 16 years old and was seriously into adopting any and all technology I could afford (which wasn't much), I took it upon myself to add an Alliance Tenna-Rotor to my parents' rooftop antenna...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features...

Amelia Earhart's Short-Wave Radio Never Failed

Amelia Earhart's Short-Wave Radio Never Failed, April 1935 Short Wave Craft - RF CafePlenty of intrigue still surrounds the July 2, 1937, disappearance of Amelia Earhart in the South Pacific on her way to completing an around-the-world flight. This article appeared two years prior to that fateful flight proclaiming the soundness (no pun intended) of her onboard radio. Back in the day, shortwave radio installations in aircraft required long wires trailing behind, particularly for long distance requirements like flying from the U.S. mainland to Hawaii. Those wires were a constant source of trouble due to destructive mechanical oscillations while waving in the airstream, airframe damage due to striking during the haul in/out procedure, and breakage. According to an article that appeared in the January 2015 edition of Smithsonian magazine, it is suspected that Earhart's antenna broke early in her flight and that is what was responsible for the loss of communication. Navy ships were tasked to monitor her progress and reported picking up spotty transmissions, but she never responded to messages...

Radiated EMI Pre-Compliance Added to PathWave ADS

Radiated EMI Pre-Compliance Added to Keysight PathWave Advanced Design System - RF CafeKeysight Technologies, a leading technology company that helps enterprises, service providers and governments accelerate innovation to connect and secure the world, today announced a new add-on to PathWave Advanced Design System (ADS) that enables designers to perform pre-compliance testing on virtual prototypes of switched-mode power supply (SMPS) designs. This new capability saves the time and cost of iterative build and test of physical prototypes. Demand for SMPS is driven by the need for greater efficiency, increased power density and lower cost. Fast, low-loss switches made from silicon carbide (SiC) and gallium nitride (GaN) will power future applications due to the high performance and efficiency they enable. However, there are unwanted side effects from the high current slew rate, such as difficultly meeting the radiated electromagnetic interference (EMI) specification...

The National Valve Museum

The National Valve Museum - RF CafeWhether you are a vintage valve - aka vacuum tube - aficionado or just have an appreciation for blown glass creations, the National Valve Museum website is not to be missed. Some glass shape are downright weird, like the Baird Telechrome and the #1846, and the metal elements inside the tubes are equally impressive. Back in the day, workers - mostly women with small, agile fingers - assembled those structures by hand - with no or very little automation. Relative distance between elements and wire lengths were critical to achieving the valve's specified performance. I recently posted circa 1947 Radio-Craft magazine articles reporting on Lee de Forest's early experimentations with his Audion amplifier and how he and a local manufacturer developed the world's first glass enclosures for electronic devices. Initial designs were not evacuated, but de Forest learned that the heater elements lasted longer when not surrounded by air (O2) and moisture. Your time perusing the photos (click on the Collections pages) will be well spent.

Many Thanks to MECA Electronics for Their Long-Time Support!

MECA ElectronicsSince 1961, MECA Electronics has designed and manufactured an extensive line of RF & microwave components for in-building, satellite, radar, radio, telemetry, mobile radio, aviation & ATC. Attenuators, directional & hybrid couplers, isolators & circulators, power dividers & combiners, loads, DC blocks, bias-Ts and adapters & cables. MECA has long been the 'backbone' of high performance wired and air-interfaced networks such as in-building applications, satellite communications, radar, radio communications, telemetry applications, mobile radio, aviation & air traffic communications. 

Triad RF Systems: RF/Microwave Amplifiers and Amplifier Systems

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. PA, LNA, bi-directional, and frequency translating amplifiers are available, in formats including tower mount, benchtop, rack mount, and chassis mount. "We view Triad more as a technology partner than a vendor for our line-of-sight communications product line." Please check to see how they can help your project.

Monday 16

Understanding Updated FM Tuner Specs

Understanding Updated FM Tuner Specs, March 1973 Popular Electronics - RF CafeSince we seem to be on a roll of FM radio theme articles printed in vintage electronics magazine, here is one from a 1973 issue of Popular Electronics. The author never explicitly tells us the date when the Institute of High Fidelity (IHF) updated its FM tuner specifications, and neither does he mention groundbreaking work of IHF's Julian Hirsch, who is largely responsible for both the initial and updated standards. If you read magazine stereo equipment reviews in the 1960s and 1970s, then you probably recall the name. Anyway, this article discusses the improved specifications made possible by more sophisticated circuits made possible by semiconductors and miniaturized passive components. Interestingly, by 1973 magazines had gone from abbreviating decibels from d.b. to dB, from k.c. and m.c. to kHz and MHz, from m.m.v. to (μV), and from r.f. to RF, but they still used i.f. (intermediate frequency) rather...

VNA Fixture Removal Video by CMT

Fixture Removal Video (Copper Mountain Technologies) - RF CafeCopper Mountain Technologies (CMT) has produced a series of videos to help users of its diverse line of vector network analyzers (VNAs) get the most out of their extensive capabilities. Proprietary features in both hardware and software supplies VNAs designed by CMT with capabilities far beyond similar equipment by other companies. This video entitled, "Fixture Removal," is one of a series of videos that can be found on the Copper Mountain Technologies website. In this video, embedding, de-embedding, and port extension are discussed, which are techniques to effectively remove test fixture effects from measurements on the device under test (DUT). It facilitates better comparison of DUT measurements to simulation predictions and gives the true parameters of the isolated DUT...

Spur Web™ Mixer Spurious Product Finder

Spur Web(tm) mixer spurious chart - RF CafeHere is a reprint of an article I had published in Wireless Design & Development magazine in 1995. Some of the references are a bit dated, but the info is all still very useful. Waypoint Software is now RF Cafe, and TxRx Designer is now Shareware by the name of RF Workbench. With the advent of high speed personal computers, a very insightful graphical method of determining inband mixer spurious products has been largely forgotten. The Spur Web™ (my name trademark, but used widely w/o attribution) chart rapidly identifies both inband and out-of-band spurs, affording a pictorial view of where conversion system frequencies lie with respect to all spur products. A comparison will be presented between the Spur Web chart method and the common numerical method...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features...

Axiom Test Equipment Blog – Keep UAVs Flying High with Proper Testing

Axiom Test Equipment Blog – Keep UAVs Flying High with Proper Testing - RF CafeAxiom Test Equipment, an electronic test equipment rentals and sales company headquartered in North County San Diego, has published a blog post entitled "Keep UAVs Flying High with Proper Testing." This blog is the first in a series of four planned articles that will take a closer look at the global fascination with UAVs and how they are used, whether for farming or for warfare, and some of the best test tools that can be applied to ensuring the best UAV performance possible. "Unmanned aerial vehicles (UAVs), popularly known as drones, have been a part of military operations for decades, often paving the way for an operation with their remote intelligence, reconnaissance, and surveillance (ISR) capabilities. Those familiar with military drones may think of million-dollar UAVs like the Predator with comprehensive electronic weapons payloads, including radar and sophisticated navigation and guidance systems. The military demand for fixed- and rotary-wing UAVs has grown steadily over the past decade...

Solid-State T/R Module Design and Modeling for Radar Applications

Solid-State T/R Module Design and Modeling for Radar Applications - RF CafeManjunatha Reddy and Tabish Khan, of Cadence Design Systems, have an article entitled, "Solid-State T/R Module Design and Modeling for Radar Applications" on the Microwave Product Digest website. Sure, it's really an infomercial for the company, but the content is very useful. "Transmit / receive (T/R) modules are at the heart of all radar systems employing beam-steering phased-array antennas. These active phased-array radars (APARs) typically require solid-state T/R modules with high-output power, low-noise figure (NF), high third-order intercept (TOI), and sufficient gain in order to function properly. Since the T/R module is 40-60% of the overall RF front-end cost, it is imperative to use an architecture that meets all requirements with the most cost-effective technology..."

Triad RF Systems Increases Quality Level to AS9100D

Triad RF Systems Increases Quality Level to AS9100D - RF CafeTriad RF Systems, a leading designer and manufacturer of integrated radio systems and high performance RF/Microwave amplifiers, announced that they recently received their certificate of Aerospace Standard 9100D (AS9100D) registration from Dekra Certification, Inc. for its manufacturing facilities located in East Brunswick, NJ. Triad's certification validates a decade of integrated radio system and RF/Microwave amplifier design and manufacturing excellence in the military, defense, UAV, and CubeSat markets for high quality, state-of-the-art RF/microwave amplifiers and subsystems that push the limits of size, features, efficiency, and linearity. Triad has earned a reputation for developing...

Transient Specialists: EMC, EMI, RFI Test Equipment Rentals

Transient Specialists - RF CafeTransient Specialists specializes in EMC test equipment rentals and carries a complete line of ESD guns, surge immunity test equipment, and EFT generators. Rentals available for military (Mil-Std 461), automotive (ISO 7637), and commercial (IEC 61000-4) EMC testing. Flexible terms, accredited calibrations and technical support on EMC testing equipment offered. Equipment consists of top EMC Test System manufacturers, including Teseq, Thermo Keytek, EM Test and EMC Partner. Contact Transient Specialists today for your ESD / EMC / RFI testing needs.

Sunday 15

Engineering & Science Crossword Puzzle for March 15

Engineering & Science Crossword Puzzle March 15, 2020 - RF CafeThis March 15, 2020, tech-themed crossword puzzle contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc., which I have personally built over nearly two decades. Many new words and company names have been added that had not even been created when I started in the year 2002. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you.

Many Thanks to Bittele Electronics for Continued Support!

Bittele Electronics PCB Fabrication - RF CafeSince 2003, Bittele Electronics has consistently provided low-volume, electronic contract manufacturing (ECM) and turnkey PCB assembly services. It specializes in board level turnkey PCB assembly for design engineers needing low volume or prototype multi-layer printed circuit boards. Free Passive Components: Bittele Electronics is taking one further step in its commitment of offering the best service to clients of its PCB assembly business. Bittele is now offering common passive components to its clients FREE of Charge.

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RF Cascade Workbook 2018 - RF Cafe

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

1996 - 2024


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 tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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