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Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

• USAF to Begin Assembly of Airborne Laser

• Ham Radio in Friedrichshafen Tentatively June 25-27

• The Rise of the IoT Semiconductor

• CPRI Traffic Convergence with Radio over Ethernet

• 10 Amazing Facts About PCBS

• Anti-Jamming Tests of Military Satellites a Success

• Bitcoin Mining Uses More Electricity Than All of Argentina

• Nano-Barrier Could Protect Satellites from Oxygen Damage

• Hybrid III–V TFETs and MOSFETs on Silicon

• 2/3 of Electricity Meters in North America Are Now Smart

Engineering Theme Crossword Puzzle for February 28th

Engineering Theme Crossword Puzzle for February 28th, 2021 - RF CafeThis Engineering Theme Crossword Puzzle for February 28th contains only words and clues related to engineering, mathematics, chemistry, physics, and other technical words. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Hedy Lamarr or the Bikini Atoll). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

Twisted Trilayer Graphene High-Temperature Superconductors

Twisted Trilayer Graphene High-Temperature Superconductors - RF Cafe"Two's company, but three's a crowd - unless you're trying to make graphene superconduct at higher temperatures. That is the finding of researchers at Harvard University in the U.S., who discovered that the superconducting state in three stacked and twisted layers of graphene is more robust to temperature increase than the equivalent state in two-layer graphene. The researchers also found evidence that superconductivity in the trilayer system comes from strong interactions between electrons, rather than weak ones as in most conventional superconductors - corroborating a result reported a few days earlier by a separate team at the Massachusetts Institute of Technology (MIT). A sheet of graphene consists of a simple repetition of carbon atoms arranged in a two-dimensional hexagonal lattice..."

Post Your Engineer & Technician Job Openings on RF Cafe for Free

Engineering Job Board - RF CafeRF Cafe's raison d'être is and always has been to provide useful, quality content for engineers, technicians, engineering managers, students, and hobbyists. Part of that mission is offering to post applicable job openings. HR department employees and/or managers of hiring companies are welcome to submit opportunities for posting at no charge. 3rd party recruiters and temp agencies are not included so as to assure a high quality of listings. Please read through the easy procedure to benefit from RF Cafe's high quality visitors...

THz Chip Spots Objects in 3D

THz Chip Spots Objects in 3D - RF Cafe"Princeton University has found a way to determine the direction to an object in three dimensions using only on-chip THz antennas with ~2°accuracy. It exploits frequency-dispersive leaky-wave antennas - end-fed strips, 1.7mm long, with transverse slots spaced at 43 μm intervals. The crucial property of these, is that injecting a frequency between 360 and 400 GHz into one end results in fan of energy leaving the antenna at right angles to its long axis (see diagram). The higher the frequency, the further tilted away from the feed end is the fan: 360 GHz leaves at right angles and 400 GHz tilts the fan at 40° to the normal, so scanning from 360 to 400 GHz sweeps the fan from 0° (normal) to +40°..."

Hobnobbing with Harbaugh - The Store

Hobnobbing with Harbaugh - The Store, June 1962 Popular Electronics - RF Cafe"My husband wants a selenimum rectalfire, a silicode capasitator, and a 16 bome appleflyer." That is the caption of one of the "Hobnobbing with Harbaugh," comics that appeared in the June 1962 edition of Popular Electronics magazine.  Dave Harbaugh's "Hobnobbing with Harbaugh" was a monthly feature for a couple years that dealt with stereotypical (pun intended) behavior of technophiles and their often unwilling, often unwitting wives, girlfriends, kids, parents, workmates, and neighbors.

New for 2021! RF & Electronics Schematic & Block Diagram Symbols for Office™ r2

RF & Electronics Schematic & Block Diagram Symbols for Office™ r2 - RF CafeIt was a lot of work, but I finally finished a version of the "RF & Electronics Schematic & Block Diagram Symbols" that works well with Microsoft Office™ programs Word™, Excel™, and Power Point™. This is an equivalent of the extensive set of amplifier, mixer, filter, switch, connector, waveguide, digital, analog, antenna, and other commonly used symbols for system block diagrams and schematics created for Visio™. Each of the 1,000 or so symbols was exported individually from Visio in the EMF file format, then imported into Word on a Drawing Canvas. The EMF format allows an image to be scaled up or down without becoming pixelated, so all the shapes can be resized in a document and still look good. The imported symbols can also be UnGrouped into their original constituent parts for editing. Check them out!

Exodus Intros 1.0-18.0 GHz, 10 W, Broadband Amplifier

Exodus Advanced Communications Intros 1.0-18.0 GHz, 10 W, Broadband Amplifier - RF CafeExodus Advanced Communications has introduced a broadband amplifier, model AMP1074−9, which covers 1.0 to 18.0 GHz and produces >10 Watts minimum power (15 W nominal). The AMP1074−9 has a minimum gain of 40 dB with -20 dBc harmonics. The unit is a compact Linear Class A/AB design for optimum reliability & ruggedness for all applications. Nominal dimensions of 140W x 160L x 27H mm with SMA female connectors. Features: Class AB GaN design, instantaneous ultra-wide bandwidth, broadband coverage of C, X and Ku Bands...

Please Visit Triad RF Systems to Thank Them for Their 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.

Electronic Puzzle Square

Electronic Puzzle Square, January 1945, Radio-Craft - RF CafeThis Electronic Puzzle Square, compliments of Lt. C.K. Johnson, appeared in the January 1945 issue of Radio-Craft magazine. It consists of electronics-related numerical questions whose answers, if correct, create a 4x4 matrix whose columns, rows, and long diagonals all add up to 45. Non-integer answers need to be rounded according to standard rules (do not just truncate). In case you left your slide rule at the office, a link is provided to assist with Q2. The biggest head scratcher question is Q4, since it requires the conversion from polar to rectangular coordinates, but hey, you're an engineer (or a crack technician). Having Euclid on-hand for Q5 might be helpful. A link is provided to a copper wire parameter table for Q9. Have fun.

Withwave Intros DC to 40 GHz Flexible Armored Cable Assemblies

Withwave Intros Flexible Armored Cable Assembly (W701): DC to 26.5 & 40 GHz - RF CafeWithwave's W701 Series are complete line of high performance flexible microwave cable assemblies. Specially, Flexible Armored W701 Series have low density PTFE structure to achieve velocity propagation of 76% and good phase and amplitude stability performance. They have excellent RF performance up to 26.5 GHz, and DC to 40 GHz with SMA and 2.92 mm connectors, respectively. Features: center conductor: silver plated copper, insulator: low density PTFE, outer conductor 1: silver plated copper foil, outer conductor 2: silver plated copper wire, jacket: FEP...

Inventors and Their Inventions

Inventors and Their Inventions, Kirt's Cogitations #325 - RF CafeWhen doing some research for creating a new quiz on inventors and their inventions, I decided to look for people according to their countries. I almost always do image searches since doing so does a good job of filtering out pages that merely mention the topic of interest. My first Google search was "american inventors." I expected to see the familiar faces of Thomas Edison, Henry Ford, George Westinghouse, Marie Curie, Alexander Graham Bell, George Washington Carver, Edwin Armstrong, Hedy Lamarr, Benjamin Franklin, Robert Goddard, Albert Einstein, the Wright Brothers, Samuel Morse, William Shockley, etc. Those are the names that first come to my mind, and admittedly the list is dominated by White men. Imagine my surprise when the Google search results belied my perception. Take a look at the first few pages of results to see what I mean. Next, I moved on to an image search for "canadian inventors..."

Free-Space Optical Light to Provide High-Speed WiFi

Free-Space Optical Light to Provide High-Speed WiFi - RF Cafe"A team of researchers from Duke University, in partnership with Facebook's Connectivity Lab, have announced a major advancement towards the dream of ditching the fiber in fiber optics. Visible and infrared light can carry more data than radio waves, but has always been confined to a hard-wired, fiber-optic cable. While working to create a free-space optical communication system for high-speed wireless internet, the researchers showed that speed and efficiency properties previously demonstrated on tiny, single-unit plasmonic antennas can also be achieved on larger, centimeter-scale devices. The research appeared online in the journal Optica. In 2016, researchers from Internet.org's Connectivity Lab..."

Anatech Electronics Intros Multiband Duplexer Filter

Anatech Electronics Intros Multiband Duplexer Filter - RF CafeAnatech Electronics offers the industry's largest portfolio of high-performance standard and customized RF and microwave filters and filter-related products for military, commercial, aerospace and defense, and industrial applications up to 40 GHz. Two new filters have been introduced: a 10.01 GHz cavity bandpass filter with a 320 MHz bandwidth and 1 dB of insertion loss, and an LTE Band 8 uplink / Band 3 downlink multiband duplexer filter with <50 dB isolation between bands and 1 dB insertion loss. Custom RF power directional coupler designs can be designed and produced when a standard cannot be found, or the requirements are such that a custom approach is necessary...

Choosing Your Crossovers

Choosing Your Crossovers, October 1957 Radio & TV News - RF CafeAudio crossover networks have the same fundamental mission as RF multiplexer filters in radio systems, which is to separate and steer specific bands of frequencies into two or more signal paths. While simple in concept, implementation in hardware can be a major challenge depending on requirements for channel separation, feedthrough, phase and group delay, amplitude equalization, distortion, and other factors. This article discusses some of the decisions used by crossover network designers when considering where to make band breaks, while leaving actual circuit design rules to other authors. I built a set of custom speakers many moons ago and went through the frustrating process of deciding where to place the breaks and which speakers to use...

How to Break into the Aviation Radio Game

How to Break into the Aviation Radio Game, April 1932 Radio News - RF CafeYes, this is another article that will probably appeal to a small percentage of RF Cafe visitors, but please countenance my indulgence in things aeronautical as well as things electrical. The early 1930s was a time when both airplanes and electronics were a wonder and a mystery to most of the public worldwide. Of course today both are still a mystery to the public but the wonder is gone - it's merely taken for granted. Many idiosyncrasies of airborne electronic communications were encountered for the first time, like the need for proper grounding and static electricity dissipation. Ruggedization of chassis assemblies in terms of mechanical vibration and shock as well as for temperature extremes was a real challenge to engineers, technicians, and pilots...

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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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