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Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

• FCC Rejects Calls to Delay Indoor Location Accuracy Improvements

• LiDAR Market Growing at 34% CAGR to $2.9B in 2025

• Nanosheet-Based Electronics Could Be One Drop Away

• Efficient Generation of High-Dimensional Quantum Teleportation (beam me up)

• Critical Role of High-Tech R&D in the Wuhan Flu Era

• Onshoring Defense Microelectronics Production

• Space Force Joins U.S. Intelligence Community

• China to Begin Construction of Space Station This Year

• T-Mobile Raises $3B to Fund Massive U.S. Spectrum Spending

Biggest "Portable" Radio

Biggest "Portable" Radio, July 1945 Radio-Craft - RF Cafe"Portable" is a matter of perspective when it comes to large systems. Anything that can be put on wheels and moved over land is technically portable, but the speed at which it can be brought into operation once relocated is what really defines whether something is portable or not. To be truly portable, all of the requisite support equipment must travel with it; e.g., electric generators, fuel, water, food, personnel facilities (if needed), etc. The MPN−14 portable airport surveillance radar (ASR) and precision approach radar (PAR) unit I worked on in the USAF truly qualified since it was entirely self-contained and the necessary power generators were supplied by a separate shop within the 5th Combat Communications Group to which I belonged. Other shops provided creature comfort facilities, ground-based and satellite radio communications, tactical air navigation (TACAN), security, and managerial services. A few times each year we had what were called "Healthy Strikes" where claxons would sound in the barracks...

CMT Webinar: Materials Measurement at 5G Frequencies

Copper Mountain Technologies Master Class Webinar: Materials Measurement at 5G Frequencies - RF CafeOn Wednesday, January 20th at 2:00 PM EST (GMT -5:00), Copper Mountain Technologies will present another of its VNA Master Class Webinar series entitled "Materials Measurement at 5G Frequencies." This webinar will demonstrate the use of free-space spot probes to characterize materials at 20 to 40 GHz, of interest to new 5G millimeter wave frequencies. A table-top measurement system using CMT's S5243 VNA will be used to determine transmission and/or reflection of materials. From these measurements, the webinar will discuss the calculation of dielectric properties of measured materials. The agenda consists of free space measurement description, example measurements & dielectric calculation and a Q&A session at the end...

Why Radio Astronomers Need Quiet in a WA Desert

Why Radio Astronomers Need Quiet in a WA Desert - RF CafeHa, I thought WA referred to Washington state, but not so. It's a good thing because I was going to accuse them of using a phony photo that includes the Large and Small Magellanic Clouds which are not visible from Washington! "A remote outback station about 800 km north of Perth in Western Australia is one of the best places in the world to operate telescopes that listen for radio signals from space. It's the site of CSIRO's Murchison Radio-astronomy Observatory (MRO) and is home to three telescopes (and soon a fourth when half of the Square Kilometre Array, the world's largest radio telescope, is built there). But it's important these telescopes don't pick up any other radio signals generated here on Earth that could interfere with their observations. That's why the observatory was set up with strict rules on what can and can't be used on site..."

Hi Tide in the Tweeter

Hi Tide in the Tweeter, October 1956 Popular Electronics - RF CafeBefore the current generation began destroying its hearing with smartphone earbuds, their parents and grandparents (that includes mine) destroyed our hearing with ridiculously powerful loudspeakers, often in boom boxes perched on shoulders right next to the ears (not me). The "concert hall" - or concert auditorium - experience has been long sought-after since recorded music has been available, which has only been about a century. As evidenced by the sudden increase in articles and advertisements in my growing collection of vintage electronics magazines, the early and mid 1950s saw a sudden swell of articles promoting the equally swelling supply of high fidelity (hi-fi) recording and playback equipment hitting the markets. Subjects ranging from homebuilt projects to reports of top end commercially products filled the pages each month. Television saw the same treatment in the late 1950s and early 1960s...

Qorvo Unleashes Full 6 GHz Performance with New Wi-Fi 6E FEMs

Qorvo® Unleashes Full 6 GHz Performance with New Wi-Fi 6E FEMs - RF CafeQorvo, a leading provider of innovative solutions that connect and power the world, today introduced two Wi-Fi 6E front end modules (FEMs) designed to maximize throughput and range in high-bandwidth applications such as 8K video streaming, online gaming and virtual reality. Wi-Fi 6E is an extension of Wi-Fi 6 that operates in the recently opened 6 GHz frequency band, in addition to the traditional 2.4 GHz and 5 GHz bands. Wi-Fi 6E triples Wi-Fi capacity with contiguous spectrum to accommodate 7 additional 160 MHz-wide channels or 14 additional 80 MHz channels. Qorvo's Wi-Fi 6E FEMs unleash the full potential of this new spectrum, delivering leading linearity performance and maximizing throughput and capacity at peak permissible indoor power levels...

Thanks to ConductRF for Long-Time Support!

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! 

Sprague Trading Post

Sprague Trading Post, August 1945 Radio-Craft - RF CafeHave you been looking for a Zenith Radio Nurse, a Superior Speedometer Multitester, or maybe a Clough Brengle 3" Oscilloscope? Perhaps you happen to have a wireless phono oscillator, a Weston 722 radio, or a Dumont 3" model 164E oscilloscope for sale. In either case, the Sprague Trading Post would have been the place to go in the mid 1940s, when the company paid good money in Radio-Craft magazine to host a swap shop for electronics hobbyists and professionals. Vacuum tubes, radios, test equipment, and related items were offered and requested. Sprague was/is a major manufacturer of capacitors, so they probably figured some of the equipment would need replacement capacitors which traders would buy from them...

Over-the-Air (OTA) Testing

Over-the-Air (OTA) Testing (R&S) - RF CafeRohde & Schwarz has a downloadable whitepaper entitled, "Over-the-Air (OTA) Testing - Important Antenna Parameters, Test System Setup and Calibration." Future technologies and standards will make over-the-air (OTA) testing mandatory. At the same time, integrated antennas are becoming more common with each development cycle such as for low-cost IoT devices and 5G mmWave devices. Since measurement requirements will change with OTA testing, engineers need a basic understanding of antennas and antenna measurements. This paper provides you with extensive knowledge on the following: Antennas in general, their parameters and different types, as well as antenna characterization and testing The importance and execution of OTA test setup calibration...

Webinar: Designing PCBs 5x Faster Despite the Pandemic

Designing PCBs 5x Faster Despite the Pandemic - RF Cafe"Join our webinar on January 20th, to learn how Kinetic Vision uses Altium's platform to enable a connected and frictionless PCB design experience, increasing their productivity x5 even in the midst of Covid. For over 30 years, Kinetic Vision has provided technology solutions to over 50 of the top Fortune 500 companies in the world. Hear about how their embedded development team needed a better design and collaboration solution to satisfy the increasing needs of their demanding clients and how Altium helped solve their toughest issues. Altium Designer is their tool of choice when it comes to designing PCBs, as it provides the most connected PCB design experience - removing the common points of friction that occur throughout a typical design flow. With the Covid situation, using Altium's platform became even more essential as it enabled seamless remote working..."

Radio-Craft Incorporating Radio & Television

Radio-Craft Incorporating Radio & Television, November / December 1941 Radio-Craft - RF CafeThe announcement of the merging of Radio-Craft and Radio & Television magazines into a single publication was made on the eve of America's entrance into World War II. Knowing the visionary talents of publisher Hugo Gernsback, he probably did so at least partly due to what could be predicted as a severe contraction of the domestic electronics appliance market once the war machine gears began cranking. It turns out that he was in fact prescient, because history shows that the government did direct all critical production to military equipment. Buying a new model radio, television, washing machine, and to some extent car grew increasingly difficult from about 1942 through 1945...

Guerrilla RF GRF5508/10 ¼W PAs w/Ultimate in Native Linearity

Guerrilla RF GRF5508/10 ¼W Power Amplifiers Deliver the Ultimate in Native Linearity - RF CafeGuerrilla RF introduces the GRF5508 and GRF5510, two of ten new ¼ W linear power amplifiers being released as part of the company's expansion into the cellular market. These new InGaP HBT amplifiers were designed specifically for 5G/4G wireless infrastructure applications requiring exceptional native linearity over temperature extremes of -40°C to 85°C. Spanning frequency ranges of 800-900 MHz and 880-960 MHz respectively, the GRF5508 and GRF5510 are tuned to operate within the n5, n8, n18, n20 and n26 5G new radio (NR) bands. The devices can deliver 24 dBm of linear power over the entire -40°C to 85°C temperature...

Thanks to Copper Mountain Technologies for Continued Support

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.

Du Mont "Duoscopic" Television Receiver

Du Mont "Duoscopic" Television Receiver, March 1954 Radio & Television News - RF CafeThe Duoscope, as presented in a 1954 issue of Radio-News magazine, was a pretty neat concept - sort of like a picture-in-picture (PiP) scheme for television, only in a way much better. Whereas PiP provides only a partial screen for each television program, Du Mont's "Duoscopic" viewer somehow received two independent signals and combined them on the screen in such a manner that there was both a horizontally polarized for one show and a vertically polarized image for the other. The viewer selected which picture to watch by wearing the appropriately polarized glasses or by watching through a floor-mounted transparent, polarized screen. The superimposed image on the CRT looked a lot like a virtually indiscernible 3-D picture as seen without colored glasses. Similarly, the audio for each program was selectable using a remote (wired) switch box. Headphones were used to provide private listening. The Duoscope turned out to be just another "outside the box" concept that never played out in the consumer world...

Withwave End Launch 1.0 mm Connector for DC - 110 GHz

Withwave End Launch 1.0 mm Connector (Narrow Block) for DC to 110 GHz - RF CafeWithwave's new End Launch 1.0 mm (Narrow Block) coaxial connectors are specially designed for well used high frequency substrates to minimize electromagnetic effects including impedance discontinuities from coaxial to GCPWG (Grounded Coplanar Waveguide) and Top Ground Microstrip structure. The types of connectors are 2.92 mm, 2.4 mm, 1.85 mm & 1.0 mm. Applications include RFIC Chip set evaluation boards, high data rate ASIC and SoC evaluation module test, and substrate characterization.  We solve your performance and cost problems.

China Testing NextGen Wireless Technology Using THz Waves

China Testing NextGen Wireless Technology Using THz Waves - RF Cafe"While most of the world is still using the 4G networks and some companies have just released 5G networks, China is testing next-generation wireless technology that is said to be 100 times faster than the American version of 5G. This next-generation network expands from the 5G millimeter-wave frequency to terahertz frequency. The 5G network promises mass connectivity, ultra-reliability, and guaranteed low latency. However, there is a limit to what 5G can do until 2030 and beyond. New Chinese research has outlined four major paradigm shifts that are needed for a next-generation network. The long-form review is entitled "Towards 6G wireless communication networks: vision, enabling technologies, and new paradigm shifts..."

White Paper: Radio Fundamentals for Cellular Networks

Radio Fundamentals for Cellular Networks - RF CafeRohde & Schwarz recently published a white paper entitled, "Radio Fundamentals for Cellular Networks." It begins: "Cellular technologies have advanced from first generation (1G) analog technologies to advanced high performance fourth generation (4G) and fifth generation (5G) systems in just four decades. Despite the increase in complexity of wireless standards and devices, cellular technologies maintain a set of common principles that form the basis behind the design of cellular systems. In this white paper, we explore these basic principles and examine the underlying technologies that lay the foundation for today and future cellular systems." BTW, does anyone else think R&S's use of that light blue on a gray background is not a very good choice?

Audio Quiz

Audio Quiz, April 1955 Popular Electronics - RF CafeThere are a lot of audiophiles in the RF Cafe audience, so this 10-question Audio Quiz from Popular Electronics should prove useful. It covers not just the physical aspects but also some simple electronics concepts, like decibels of gain, crossover networks, push-pull amplifiers, etc. High fidelity (hi-fi) stereophonic equipment was all the rage in the 1950s and 1960s. It was a way for people to enjoy live concert quality music in their homes since the quality of radio transmissions was not reliable, and stereo broadcasting was not a common feature until the 1960s. Many articles were published educating beginners and veterans on ways to optimize both equipment - receivers, turntables, speakers, equalizers, etc. - and environmental parameters. Similarly, many stereo-themed comics...

Many Thanks to Atenlab for Their Continued Support!

Atenlab microwave components - RF CafeAtenlab has been operating in Taiwan for more than a decade, and has sold and installed hundreds chambers around the world. Holistic, affordable Over-the-Air (OTA) measurement systems perform comprehensive measurement and test in a controlled environment. Compact Antenna Test Range (CATR) with one-touch operation supports multiple systems - 2G, 3G, 4G, 5G - and major instrument brands. [M]ulti-probe OTA measurement systems offer reduced time measurements over single-probe systems.

Meissner Manufacturing Company

Meissner Manufacturing Company, March 1944 Radio-Craft - RF CafeMeissner was one of many electronics manufacturers that re-tooled their facilities for defense production during the war years. They made RF coils and transformers (and a few radios). Company public relations offices were sure to make their contributions known to people who used their products and/or services. In this 1944 full-page ad in Radio-Craft magazine, Meissner touted its coveted Army-Navy "E" rating, awarded for "excellence" performance. According to the Wikipedia entry, only 2% of companies earned the distinction, so it really was a big deal. The term "precision-el" was used throughout Meissner promotions, and it took a bit of work to determine what it meant. Turns out precision-el (i.e., precisionel) is a play on personnel (i.e., personn-el). Such things were considered clever back in the day...

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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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