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Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

Russian-Ukrainian "Radio War" Remains at a High Level (1940s redux)

• NTIA: 3.45-3.55 GHz Good Candidate for Mid-Band Sharing

Building Supply Chain Resilience During a Global Disruption

• EC Proposes No 5G Small Cell Planning Permission Obligations

• World's 1st 1 µF Multilayer Ceramic Capacitor for Smartphones

• Will the Tech Workplace Ever Be the Same Again?

Hong Kong's Status as Semiconductor Hub Under Threat

• Cambium Embraces 60 GHz, Wi-Fi 6

Breakthrough in Spintronics Could Boost High Speed Data

Protect Against Lightning

Protect Against Lightning, July 1955 Radio & Television News - RF CafeLightning has not changed since the days when Benjamin Franklin flew his special kite during storms. Contrary to some peoples' belief, he did not "discover electricity;" rather, the experiment proved his theory that lightning was a form of electrical discharge. Maybe someone has already pointed this out, but in effect Franklin put into service the world's first lightning rod. The conductive (wet with rain) hemp rope between the metal wire spike on the kite and ground (the plate of a Leyden jar) performed the task a lightning rod is meant to do - lower the difference of potential between the charged clouds and ground, thereby reducing the likelihood of an electrical discharge. An induced current traveled along the rope and charged the Leyden jar. If lightning had actually struck the kite as fables suggest, Franklin would probably have been killed even though he was holding on to a silk string attached to the bottom of the hemp string to provide some insulation. Mr. Kirchhoff's current law would have apportioned the lightning strike current at the knot joining the two strings according to the respective...

The Uncertain Future of Ham Radio

The Uncertain Future of Ham Radio - RF Cafe"The Uncertain Future of Ham Radio." Now there's a loaded title for an article on the IEEE Spectrum website. Written by Julianne Pepitone asserts, "Software-defined radio and cheap hardware are shaking up a hobby long associated with engineering." There are couple ways to look at the situation. One is that the availability of pre-engineered and built equipment is harming the fundamentals of the hobby by removing the requirement for a deeper understanding of the fundamentals. Another is that the real world of engineering is going the same way as well. Freeing up talent from the need to create and fabricate every minute aspect of a project opens opportunity for other creativity and skills building. As a documented lover of vintage equipment, I am willing to allow for modern approaches for vastly improved technology and, coincidently, lower prices. Ditto for all hobbies and activities.

DoD Gets $120M for Hypersonic Tracking Satellites

Dod Gets $120M for Hypersonic Tracking Satellites - RF Cafe"The Senate's annual defense policy bill would authorize an additional $120M toward a space-based sensor layer capable of tracking hypersonic weapons, despite the fact the Department of Defense did not seek more funding for the project in its fiscal 2021 budget requests. The Hypersonic and Ballistic Tracking Space Sensor is DoD's answer to the growing threat posed by hypersonic weapons being developed by China and Russia. Hypersonic weapons present a significant challenge to the United States' current missile warning architecture. Not only can these weapons maneuver around ground based sensors, they're too dim to be picked up and tracked by space-based sensors in higher orbits. HBTSS theoretically solves this problem via a proliferated constellation of Overhead Persistent Infrared (OPIR) sensors operating in low earth orbit..."

How to Solder

How to Solder, April 1955 Popular Electronics - RF CafeProper soldering is almost as much of an art form as it is a technical skill. Having been through numerous soldering classes in my career, starting with electrical vocational courses in high school, then again in USAF technical school, and other times while working as a technician and engineer, I always exercise care in making solder joints. Proper preparation - including both tinning of mating surfaces and a means to prevent the joint members from moving during cool-down - is of utmost importance for assuring a nice, smooth, shiny joint with just the right amount of solder. Lead-free solders do not tend to produce the level of shininess as do the good old 60-40 type tin-lead solders, but you can still make a nice looking joint. This might be more information than you want to know about me, but I even strive for perfection in solder joints in copper pipes and fittings used in plumbing work...

3D Printing of Antennas and RF Electronics

Practical 3D Printing of Antennas and RF Electronics - RF CafeMssrs. G. Kiesel, P. Bowden, K. Cook, M. Habib, J. Marsh, D. Reid, C. Phillips, and B. Baker of Georgia Tech Research Institute have an interesting article on the Aerospace Defense website entitled, "Practical 3D Printing of Antennas and RF Electronics." The earliest forms of 3D printing involved depositing successive layers of a pasty substance on a substrate, with a curing steps between layers. Next can using a melted polymer (plastic) filament to lay down tiers without the need for intermittent curing. For many years processes have been developed for 3D printing metallic structures. Many of these techniques are being used in "additive manufacturing" schemes to produce marketable items, including complex 3D shapes needed for medicine, automotive, and aerospace markets. This article discusses 3D printing in the RF & microwave realm.

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.

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...

Amateur Radio Crossword Puzzle for July 12

Amateur Radio Crossword Puzzle for July 12, 2020 - RF CafeThis week's custom RF Cafe crossword puzzle contains some words particular to amateur radio, along with other tech-themed words and clues. Each week for two decades I have created a new technology-themed crossword puzzle using only words (1,000s of them) from my custom-created lexicon related to engineering, science, mathematics, chemistry, physics, astronomy, etc. You will never find among the words names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort. You might, however, find someone or something in the otherwise excluded list directly related to this puzzle's technology theme, such as Hedy Lamarr or the Bikini Atoll, respectively. Avid cruciverbalists amongst us: the gauntlet has been thrown down...

Electronics-Themed Comics

Electronics-Themed Comics, June 1951 Radio-Electronics - RF CafeWhen looking a these vintage electronics-themed comics, it probably is a case of "you had to have been there" to appreciate the humor in them. In a world of 24/7 broadcasting of every TV channel, the first comic wouldn't even make sense to someone who was born after about 1990, after which time most local over-the-air broadcast stations signed off at 1:00 or so, played the National Anthem, and then displayed a test pattern until about 6:00 am. The second comic is from the era of high voltages inside radio and TV chassis for vacuum tube plates and CRT accelerator grids. That big bulky thing the guy in the last comic is carrying is a thing called a cathode ray tube (CRT), which old people used to use to view television shows and SVGA computer displays...

RF Energy Harvesting Components & Systems

RF Diagnostics' RFD199A RFDET Converter - RF CafeRF Diagnostics, LLC, designs and sells surface mount RF to DC converters and other building block modules for RF energy harvesting systems. With our products you can harvest ambient AC/AM/FM/Wireless Energy to power your IoT battery-free system. For example, the RFDKIT−01 RF Energy Harvesting Experimenter Kit is intended for energy harvesting developers and hobbyists. It is intended for low power system developers and hobbyists. The kit contains parts to collect and manage the power from wireless energy from 1 Hz to 6 GHz. Users can connect to the modules using the included 4-pin headers with a little soldering and clipping. We also provide custom designs for RF/microwave and general electrical engineering products and design contracting services to clients in the commercial wireless and defense electronics businesses...

Many Thanks to LadyBug Technologies for Their Continued Support!

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.

Molecular Electronics

Molecular Electronics, April 1960 Popular Electronics - RF Cafe"A transistorized i.f. stage for a TV set can be built today to fit into a match box. But molecular electronics has made possible the production of a device that contains two such stages and is only a fraction of the size of a single transistor!" Nobody talks of molecular electronics today, but that really is an accurate term for what we have when compound semiconductors like GaAs, GaN, or any of the many-atomed exotic photovoltaic substrates are being discussed. When referring to pure elements like silicon that are being doped with impurities, I'm not sure those structures are considered molecules which, according to Dictionary.com, are "the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound..."

Empower RF Systems' Technologically Advanced 90 kW SSPA

Empower RF Systems' Technologically Advanced 90 kW Power Amplifier - RF CafeEmpower RF Systems' Model 2225 is a long duty cycle pulsed amplifier operating from 5.2 to 5.9 GHz and represents our new technologically advanced liquid cooled and scalable architecture. This breakthrough solid state GaN design replaces tube technology to bring new capabilities to EW, Radar, Directed Energy and Satcom applications where tens and hundreds of kilowatts of CW and Pulse power are required. This new modern architecture offers scalability for affordable upgrade paths to future power needs by adding hardware to an existing system. Additional racks can be combined and for racks not fully populated, 2U amplifier drawers can be added without the need for tuning...

everythingRF: Their Name Says It All

everything RF Searchable Database - RF CafePlease take a few moments to visit the everythingRF 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.

For the Record: The Flat Age

For the Record: The Flat Age, July 1955 Radio & Television News - RF CafeRadio & Television News editor Oliver Reed wrote in this 1955 issue about the "flattening" of electronics - including both individual components and overall assembled products. He described a large screen, wall-mountable television system with built-in flat stereo electrostatic speakers. "The so-called 'picture on the wall' television screen has also received widespread publicity although such a screen is not yet commercially available. In this system, a flat screen is connected to the TV receiver by means of a cable, and the picture is formed on the screen electronically." That is a lot like a large flat LCD or LED monitor being fed by an HDMI cable from a computer. Mr. Reed also writes of a magnetic tape video playback system akin to what eventually became the VHS / VCR. Evidently the concept of an optical-based storage medium like the DVD and Blu-ray disk was too far out of the realm of possibility...

Guidelines for Choosing RF and Microwave Products: Coaxial Cables

Guidelines for Choosing RF and Microwave Products - RF CafeAnatech Electronics has a handy app note describing how to select and specify coaxial cables and assemblies. "Coaxial cables are too often taken for granted and RF and microwave systems. As a result, they are often treated like a spool of bell wire, twisted, band, crimped, stepped on, and subject to assorted other abuses. However, the more you know about coaxial cable the more likely you are to treat it with respect, as its integrity, lifetime, and overall performance are at stake. To get a better understanding of coaxial cables in general, Anatech Electronics has prepared a series of guides that provide information about RF and microwave coaxial cables ranging from the basics contained in this application note to more detailed information about characteristics, applications, specific cable types, and other topics..."

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...

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.

Editorial re FCC Potentially Shutting Down Amateur Radio During WWII

Editorial on FCC Potentially Shutting Down Amateur Radio During WWII, November 1940 QST - RF Cafe"Do you think that F.C.C. would be engaged in the present terrific expense and effort of getting our fingerprints and citizenship histories if there were intention of shutting us down shortly?" That statement was printed by the QST magazine editor in the issue that preceded the December 7, 1941, attack on Pearl Harbor by thirteen months. A few things about it are troubling. First, the FCC was collecting fingerprints of licensed amateur radio operators. Second, the FCC was assimilating information about licensed amateur radio operators' citizenship histories. Third, a combination of short-sightedness and apparent naiveté concerning the FCC's willingness to shut down amateur radio operations once America had been inevitably drawn into World War II...

Qorvo / Custom MMIC CMD242K4 GaAs Distributed Amplifier - RF Cafe PCB Directory (Assembly)
Res-Net Microwave - RF Cafe Berkeley Nucleonics Model 865 Signal Generator - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 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 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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