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Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

• Dish May Have to Relinquish $3.3B Worth of Spectrum

• Wireless Telecom Group WTT Reports Growth in Q3  Despite Wuhan Flu

• 2021 Beginning of the End of Mobile Data Commoditization

Qorvo Outperforms Expectations in Q2

• Lockheed Martin to Provide Advanced Radar Signal Processing for E-2D Aircraft

• Report Shows Chinese Dominance in RF GaN Industry

Arecibo Radio Telescope Deemed Beyond Repair (heavy sigh)

• Imec Begins 6G R&D

FCC Votes to Open 5.9 GHz for Wi-Fi, C-V2X

New Antenna to Multiply Field

New Antenna to Multiply Field, January 1938 Radio-Craft - RF CafeAmateur radio enthusiasts are very familiar with burying ground radials below the surface (or sometimes just laid on top) in order to increase antenna efficiency by affecting impedance and, more importantly, the radiation pattern. Long distance (DX) operators generally prefer low launch angles over high angle "cloud warmers." Pittsburgh's KDKA, the country's first commercial broadcast radio station, built what would have been the mother of all ground radial arrays for its time - 360 (one every degree), 700-foot copper wires (8 AWG), for a total of a quarter million feet! It was laid using a farm tractor drawing a non-motorized trench cutter that looks like it came straight from the John Deere factory. It also implemented a new type of passive vertical suppressor element array...

RF Filter Market to Grow Steadily to $15B by 2024

RF Filter Market to Grow Steadily to $15B by 2024 - RF Cafe"According to a recent report published by Technavio, the RF Filters Market is poised to grow at a CAGR of over 20% from 2020 to 2024 to reach USD $15.73B. The report offers an up-to-date analysis regarding the current market scenario, the latest trends and drivers, and the overall market environment. According to the report, the market is fragmented, and the degree of fragmentation will remain the same during the forecast period. The increase in product launches, organizational restructuring, M&A, and partnerships help market participants expand their product portfolios, geographic presence, and distribution networks. Skyworks Solutions Inc., STMicroelectronics NV, Tai-Saw Technology Co. Ltd., Taiyo Yuden Co. Ltd., and TDK Corp. are some of the major market participants..."

Thanksgiving Day Crossword Puzzle

Thanksgiving Day Crossword Puzzle for November 26, 2020 - RF CafeHere is a specially-made Thanksgiving Day 2020 crossword puzzle compliments of RF Cafe containing a few specific words commemorating the holiday along with the usual assortment of engineering and science related words and clues. Thanksgiving is celebrated in America each year on the fourth Thursday of November in commemoration of the 1621 feast where the Plymouth colonists and Wampanoag Indians shared a harvest feast. Macy's 91st Thanksgiving Day Parade occurs on the morning of Friday, November 26th and follows a route along Central Park West and 6th Avenue. Interestingly, the parade was cancelled during the World War II years of 1942, 1943, and 1944 in order to conserve much needed raw materials. This year, 2020, it will be a hollow event with no spectators allowed along the parade path...

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. 

Mac's Radio Service Shop: A Sound Conversion

Mac's Radio Service Shop: A Sound Conversion, November 1951 Radio & Television News - RF CafeListen to the RF Cafe Podcast! A November edition of "Mac's Radio Service Shop" is appropriate given today's date, especially since author John T. Frye nearly always had the story's setting coincide with the month in which it appeared in Radio & Television News magazine; the year was 1951. The unspecified dateline is somewhere in the upper Midwest, most likely Indiana. Mac's mention of converting a black-and-white television set to color by installing a "color wheel" really betrays the era. The NTSC (National Television System Committee) had not yet adopted an industry standard for color TV, and the various manufacturers were selling a mix of mechanical, electro-mechanical and all-electronic sets. In 1953, the NTSC settled on a 525-line interlaced scan (only 468 lines are part of the visible scan). Knowing that a better color system would be available soon due to massive public demand, Mac put his efforts into talking customers out of a color conversion...

Triad RF Systems' Stephen Barthelmes Interview by everythingRF

Triad RF Systems' Stephen Barthelmes Interview by everythingRF - RF CafeStephen Barthelmes of Triad RF Systems talks amplified radios, Doherty techniques, SDR, and UAVs with everythingRF. We talk about everything from amplified radios and Doherty techniques to software defined radio (SDR) systems and UAVs in an interview with everythingRF this week. everythingRF: Can you give us a brief history about Triad RF? Stephen Barthelmes: Triad RF was established in 2010 when the idea for the company began. In 2013, Dave, Dean and I got together to begin the development of RF products that were underserved by the market. By bringing the decades of knowledge that we had accumulated together, we implemented solid processes in sales, design and manufacturing that produced products that were cutting edge in performance and cost. We also understood the market pressures for increasing RF power to enhance data transmission while simultaneously improving overall efficiency. We stepped up to that challenge by creating some of the most linear and efficient amplifiers in the market...

3D NAND Hits 176 Layers

3D NAND Hits 176 Layers - RF Cafe"Micron Technology recently unveiled 176-layer, triple-level-cell (TLC), 3D NAND flash memory with a 30% smaller die size that employs a new replacement-gate (RG) NAND technology. The chips offer a 35% read/write latency improvement as well as a 33% increase in transfer rate, which is now 1600 Mtransfers/s. The chips are actually built from a pair of 88-layer stacks. When making a 176-layer stack, the challenge is the difficulty in ensuring uniform construction up and down the stack. The latest chips follow on the heels of the 128-layer device from Micron, which also employed 3D NAND and 64-layer stacks. The challenge that RG NAND addresses..."

Modeling Radiation Patterns of Whip Antennas

Modeling Radiation Patterns of Whip Antennas, January 1967 QST - RFCafeComputer modeling of antenna radiation patterns has evolved from a relatively simple electric field equation that diminishes as the inverse of the distance from the source, to exotic, highly sophisticated numerical methods that account for conducting and dielectric surfaces and volumes. A spreadsheet can be built rather quickly to calculate and graph the free-space azimuth and elevation e-field patterns for a 1/4-wave whip or a dipole antenna using textbook formulas, but building a model for displaying the 3D radiation patterns of a cellphone placed next to a human head, or a UHF radio antenna on top of an aircraft takes some pretty serious computing power. In large part we owe a debt of gratitude to the Ph.D. types who have labored hard to make such tools available to us commoners. As with PCB layout software and circuit simulators, chances of success with a first pass prototype has increased...

Anatech Electronics November 2020 Newsletter

Anatech Electronics November 2020 Newsletter - RF CafeSam Benzacar of Anatech Electronics, an RF and microwave filter company, has published his November newsletter that features his short op−ed entitled "Do You Think 5G is Challenging? Meet 6G!," which delves into what can be expected based on current planning. "Like its predecessor, 6G is more than simply an upgrade in data rates and capacity, as it will attempt to deliver downstream data rates up to 1 Tbye/s and operate at frequencies in the so-called sub terahertz region, just below where lightwave frequencies begin. It will make extensive use of artificial intelligence and machine learning to enable applications that 5G presumably will not have been addressed in the next decade." . Also included in the newsletter are a few industry headlines...

"As God As My Witness, I Thought Turkeys Could Fly"

WKRP in Cincinnati: "As God As My Witness, I Thought Turkeys Could Fly" - RF CafeAnyone who watched the WKRP in Cincinnati sitcom back in the 1970s has to remember what was one of the funniest episodes ever. Here is the 4 minutes that made Prime Time history. In this Thanksgiving episode, station owner Arthur Carlson decided he would surprise the community with good deed - that doubled as a promotional stunt for his radio station - by dropping turkeys from a helicopter for lucky shoppers at the local shopping mall. Watch the disaster unfold as Les Nessman reports live, and then see Carlson's final comment that is still used or alluded to in many comic routines. Posting this video is an RF Cafe tradition. Have a Happy Thanksgiving!

Thanks to Triad RF Systems for Their Long-Time 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. 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.

What's New? Biggest Heathkit, Japanese Transistor Radio

What's New? Circuit Connections, Biggest Heathkit, Japanese Transistor Portable, December 1955 Radio-Electronics - RF CafeEach month Radio-Electronics magazine ran a column called "'What's New?," which contained a few products recently introduced to the marketplace, production floor, research laboratory, etc. First up was the introduction of wire wrapping as announced by Bell Telephone Laboratories a couple years earlier (see Bell Labs full-page ads in Radio-Electronics and Radio & Television News in 1953). Wire wrapping is still used today for quickly prototyping circuits that are not too sensitive to crosstalk and super high speed. Next was the announcement of a five-transistor pocket radio from a Japanese company named Tokyo Tsushin Kogyo, which you know today as Sony. Heathkit had recently put out a build-it-yourself analog computer that used 65 vacuum tubes for $750 ($7,342 in 2020 money). A button-hole-size transistor radio was also reported...

Many Thanks for Alliance Test Equipment's Long-Time Support!

Allied Test Equipment Products - RF CafeAlliance Test Equipment sells used / refurbished test equipment and offers short- and long-term rentals. They also offer repair, maintenance and calibration. Prices discounted up to 80% off list price. Agilent/HP, Tektronix, Anritsu, Fluke, R&S and other major brands. A global organization with ability to source hard to find equipment through our network of suppliers. Alliance Test will purchase your excess test equipment in large or small lots. Blog posts offer advice on application and use of a wide range of test equipment. Please visit Allied Test Equipment today to see how they can help your project.

G-Wave Superconductor Comes into View

G-Wave Superconductor Comes into View - RF Cafe"Superconducting materials are traditionally classed into two types: s-wave and d-wave. A third type, p-wave, has long been predicted. Now, however, researchers in the U.S., Germany and Japan say they may have discovered a fourth, unexpected type of superconductor: g-wave. The result, obtained thanks to high-precision resonant ultrasound spectroscopy measurements on strontium ruthenate, could shed fresh light on the Cooper pairing mechanisms in so-called unconventional superconductors. In conventional superconductors, electrons join up to form Cooper pairs that then move through a material without any resistance. While all known superconducting materials need to be cooled to ultralow temperatures (or placed under extreme pressures) before their electrons start behaving in this way..."

Magnetic Ceramics: Ferrites

Magnetic Ceramics: Ferrites, February 1953 QST - RF CafeMagnetic ceramics have been with us for a long time - probably forever as far as most people that use them these days are concerned. When this article was published in a 1953 issue of QST magazine, ferrites for use at RF frequencies were a new, breakthrough phenomenon. Take a look at inductors used in vintage radio equipment and you will find either air or solid iron as the permeable filler elements in most instances. Whereas iron might have a permeability of 100-150, the new magnetic ceramics exhibited permeabilities up to 4,000 at 1 MHz, and even higher for lower frequencies. Modern alloys and compounds provide permeabilities of more than 50,000 for special applications. Such high values allow physical size and weight of inductors and transformers to be greatly reduced. Also, since high permeability...

ConductRF Hand Formable RF Cables at DigiKey

ConductRF Hand Formable RF Cables at DigiKey - RF CafeConductRF hand-formable RF coaxial cables are available off the shelf from DigiKey. ConductRF FM series of Hand Formable RF cable assemblies provides system designers with a versatile solution that allows RF cables to be physically routed and set in to position during installation. Standard lengths and connector types feature performance up to 18 GHz. Low loss, tinned braided cable of 0.086" diameter with shielding of >100 dB. 100% factory tested for VSWR & insertion loss. RoHS & Reach compliant. Ideal for internal module linking and great for RF Testing. When compared to traditional semi-rigid options, these cables can provide increased installation flexibility at a substantially lower cost. Made in the USA!

Antenna Principles - Directional Arrays and Radiation Fields/p>

Antenna Principles - Directional Arrays and Field Patterns, February 1947 Radio-Craft - RF CafeHere in the February 1947 issue of Radio-Craft magazine is part three of a six-part series on Antenna Principles. The first two parts concentrated on dipole antennas and feeders, and multi-element long-line and rhombic antennas. Part three is on directional arrays and radiation fields. In addition to a bit of theory, real-world examples are given of various directional antenna configurations along with field strength graphs. Without powerful computers to calculate and plot out predicted radiation patterns, a large combination of experience and in-situ measurements was required. A huge amount of time was spent for even relatively simple arrays. Finitely detailed topographical and structural models are now available which, along with very precise electromagnetic field calculation algorithms allows efficient and accurate planning...

Windfreak Technologies MPDevice microwave devices - RF Cafe
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    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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