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Homepage Archive - July 2019 (page 3)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page. About RF Cafe.

Homepage Archive Pages

2019:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2018:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2017:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2016:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2015:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

See Page 1 | 2 | 3 | 4 | 5 of the July 2019 homepage archives.

Friday 19

Thursday 18

Wednesday 17

Tuesday 16

Monday 15

Electronics-Themed Comics, July 1971 Radio-Electronics

Electronics-Themed Comics, July 1971 Radio-Electronics - RF CafeHard as it is to believe, the weekend is over and another five days of the work week lie ahead. It will be at least four more days before you can sleep in again and tend to the yard work, home improvements, camping excursions, sports endeavors, road trips, etc. Even if you love your job, having a time of reprieve is always welcome. Here is a little for you compliments of the July 1971 issue of Radio-Electronics magazine. It included a couple pretty good technology-centric comics. I particularly like the one on page 79 - a theme that occurs in many places. The guy reminds me of an engineer I worked with at Westinghouse Electric's Oceanic Division back in the 1980s ...

Trade School vs. College?

Trade School vs. College? - RF CafeWe seem to have reached a crossroads in America, as well as in a lot of other similar countries. Over the last few decades government agencies, universities, public schools, and media have convinced many people that the only way to succeed and be happy and productive is to go to college and earn a Bachelor's (or higher) degree - in anything. Drilled into us continually is that the average person with at least a four-year degree will earn up to a million dollars more in his/her lifetime. Sounds good, right? As anyone with knowledge of statistics will tell you, averages are meaningless without an accompanying figure for standard deviation. That would be the same as saying if you stand with one foot in a pot of near boiling water and the other in a pot of ice water, on the average you would feel just right. The propaganda has been so successful ...

Espionage Agent Made in China

Espionage Agent Made in China - RF CafeThis article was sent to me by an RF Cafe visitor. With the way U.S. companies have been routinely passing off critical technology to China for nearly three decades now, I'm surprised it is even considered illegal. "A Lexington businessman has been charged with trying to sell sensitive technology that was stolen from his former employer, Norwood electronics company Analog Devices Inc. A federal grand jury in Boston indicated Haoyang Yu and his company Tricon MMIC LLC with 12 counts of misappropriating Analog Devices' trade secrets, and with three counts of smuggling for selling electronic components to a customer in Spain in violation of US export control laws. Yu was scheduled to appear Friday in US District Court in Boston ..."

Editorial - The Origin of "Ham", December 1931 QST

Editorial - The Origin of "Ham", December 1931 QST - RF CafeHere it is the year 2019, a full 88 years after this editorial was published in ARRL's QST magazine, and nobody is any more certain of the origin of the term "Ham" being applied to amateur radio operators than they were in 1931. Being closer to the date of origin, though, might have given editor Kenneth Warner a bit more insight. In fact, the term Ham is usually uttered in a mildly pejorative manner; e.g., "he is such a ham." Per the QST's editor's research, Ham might be a shortening of Hamlet, referring to Shakespeare's play and the 2-bit actors who endlessly recited the lines in an attempt to impress others. Analogously, a Ham radio operator would be a professional broadcaster wannabe. However, Mr. Warner offers an even more plausible explanation that has the term descending more directly from the craft of amateur radio operation. Read on to find out ...

Galileo Satellite Navigation System Outages

Galileo Satellite Navigation System Outages - RF Cafe"Signals Are Not to Be Used - EU's Galileo global navigation satellite system nears 100 hours of downtime. Galileo, the EU's global navigation satellite system, has been down for four days, since July 11, following a mysterious outage. All Galileo satellites are still non-operational, at the time of writing. According to a service status page, 24 of the 26 Galileo satellites are listed as 'not usable,' while the other two are listing a status of 'testing,' which also means they're not ready for real-world usage. The European GNSS Agency (GSA), the organization in charge of Galileo, has not published any information in regards to the root of the outage, which began four days ago, on Thursday, July 11 ..."

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.

Sunday 14

Engineering & Science Crossword Puzzle for July 14

Engineering & Science Crossword Puzzle July 14, 2019 - RF CafeUnlike all of the other engineering and science-themed crossword puzzles I have ever seen, every word and clue - without exception - in these RF Cafe puzzles has been personally entered into a very large database of relevant terms. The list has been built over nearly two decades of creating these crossword puzzles. Let me know if you would like a custom crossword puzzle built for your company, school, club, etc. (no charge). The same software, Crossword Express, has been used to generate the puzzle for all those years. Read down near the bottom of the linked page and you will see where he was doomed by people distributing his software without paying for it (I paid for mine). I suffer the same injustice from people who receive my RF Stencils for Visio and RF Cascade Workbook software without paying me for my hard work ...


Linx nanoSplatchTM nSP250 Dual-Band WiFi/WLAN Antenna

Linx Technologies nanoSplatchTM nSP250 Dual-Band WiFi/WLAN Antenna - RF CafeLinx Technologies, a Merlin, OR based developer and manufacturer of antennas, is pleased to introduce the nanoSplatch™ nSP250 dual-band WiFi/WLAN antenna for embedded applications. nanoSplatch antennas are a reduced-size evolution of Linx Technologies successful surface-mount embedded Splatch™ and microSplatch™ antennas. The nanoSplatch™ nSP250 is an ideal embedded antenna for use in compact or portable devices targeting WiFi/WLAN and other 2.4 GHz or 5.8 GHz ISM frequency band technologies such as Bluetooth® and ZigBee®. The surface-mount nSP250 antenna uses just 80.6 mm2 of board space and costs under one dollar in volume. In addition, Linx designed the antenna to accommodate close proximity effects ...











Notable Quote by "The Father of GPS"

Notable Quote by "The Father of GPS" - RF Cafe"Reliance on satellite navigation and timing systems has become a single point of failure for much of America and is our largest, unaddressed critical infrastructure problem." - Dr. Brad Parkinson, aka "The Father of GPS." According to the Wikipedia entry, "Bradford Parkinson is an American engineer and inventor, retired United States Air Force colonel and recalled emeritus professor at Stanford University. He is best known as the lead architect, advocate and developer, with early contributions from Ivan Getting and Roger Easton, of the Air Force NAVSTAR program, better known as Global Positioning System (GPS). "















Apollo 11 Movie

Apollo 11 (2019) movie - RF Cafe

Apollo 11 movie is available on DVD.

The Moon Has a Smell

The Moon Has a Smell.


Apollo Mission Abort Planning

Abort Planning

William Saffire, "In the Event of Moon Disaster"

Dust on Apollo 11 LM?

Dust fountains

Apollo 11 in Real Time












DARPA's $1.5B Remake of U.S. Electronics

DARPA's $1.5B Remake of U.S. Electronics - RF Cafe"About a year ago, the U.S. Defense Advanced Research Projects Agency pulled back the covers on its five-year, $1.5-billion scheme to remake the U.S. electronics industry. The Electronics Resurgence Initiative included efforts in 'aggressive specialization' for chip architectures, systems that are smart enough to reconfigure themselves for whatever data you throw at them, open-source hardware, 24-hour push-button system design, and carbon-nanotube-enabled 3D chip manufacturing, among other cool things. As always with DARPA, this is high-risk research; but if even half of it works out, it could change the nature not just of what kinds of systems ..."

Straightening of Single-Molecule Conductors to Improve Performance

Straightening of Single-Molecule Conductors to Improve Performance - RF Cafe"Scientists from Osaka University in Japan have taken single-molecule conductors and straightened them in an effort to improve their performance. The team of scientists made single-molecule nanowires that measured up to 10 nanometers in length. Through their research, experts learned that taking the ribbon-like chains and forcing them to lay flat dramatically improved their conductivity, as opposed to their traditional twisted form. Scientists believe that this discovery could potentially help them to develop a new generation of high-tech devices, such as photovoltaics and smartphone screens, that are both powerful and inexpensive ..."

USAF Microwave Weapon Named "Thor" Can Kill Drones

USAF Microwave Weapon Named "Thor" Can Kill Drones - RF Cafe"Scientists from the Air Force Research Laboratory at Kirtland Air Force Base have created a new type of microwave weapon that can take down drones. Using an inaudible and invisible magnetic wave, the high-powered device could prove a powerful weapon against drones and other unmanned devices. Known as the Tactical High Power Microwave Operational Responder - or THOR for short - the device cost around $15 million to make and is capable of taking out multiple drones at a time. THOR was created over a period of 18 months as the need to protect the American military from drones has rapidly increased over time ..."

Thin Film Converts Heat from Electronics into Energy

Thin Film Converts Heat from Electronics into Energy - RF Cafe"Nearly 70% of the energy produced in the U.S. each year is wasted as heat. Much of that heat is less than 100°C and emanates from things like computers, cars or large industrial processes. Engineers at the University of California, Berkeley, have developed a thin-film system that can be applied to sources of waste heat like these to produce energy at levels unprecedented for this kind of technology. The thin-film system uses a process called pyroelectric energy conversion, which the engineers' new study demonstrates is well suited for tapping into waste-heat energy supplies below ..."

On-Demand Control of THz & Infrared Waves

On-Demand Control of THz & Infrared Waves - RF Cafe"The ability to control infrared and terahertz waves using magnetic or electric fields is one of the great challenges in physics that could revolutionize optoelectronics, telecommunications and medical diagnostics. A theory from 2006 predicts that it should be possible to use graphene - a monoatomic layer of carbon atoms - in a magnetic field not only to absorb terahertz and infrared light on demand but also to control the direction of circular polarization. Researchers from the University of Geneva, Switzerland, and the University of Manchester have succeeded in testing this theory ..."

Simulation Game Makes Graphene Research Available to Public

Simulation Game Makes Graphene Research Available to Public - RF Cafe"The team of Toma Susi at the University of Vienna uses a state-of-the-art electron microscope, the UltraSTEM, to manipulate strongly bound materials with atomic precision. Since the instruments are fully computerized, it is possible to show in a simulation how researchers actually use them. This allows for compelling and largely realistic presentations of the most recent research in materials science. A simulation game on display at the Vienna Technical Museum in a special exhibition is now available online, together with the latest research advance of silicon impurity manipulation ..."

CTIA Touts U.S. Carriers' Investment in Spectral Efficiency

CTIA Touts U.S. Carriers' Investment in Spectral Efficiency"A new report by CTIA delves into the ways in which U.S. carriers have tried to squeeze the most efficiency out of their wireless spectrum, while continuing the industry’s perennial call for the government to make still more available. U.S. wireless providers increased their spectrum efficiency by 42 times over what it was in 2010, according to the new white paper from CTIA. In 2010, the industry association said, U.S. wireless networks handled 948 million bytes per one megahertz of spectrum; now they handle 39.9 billion MBs/MHz, or more than 589,000 subscribers for each megahertz of spectrum ..."

Is Ham Radio a Hobby, a Utility...or Both? Spectrum Battle Heats Up

Is Ham Radio a Hobby, a Utility...or Both? Spectrum Battle Heats Up - RF Cafe"Like many amateur radio fans his age, Ron Kolarik, 71, still recalls the 'pure magic' of his first ham experience nearly 60 years ago. Lately, though, encrypted messages have begun to infiltrate the amateur bands in ways that he says are antithetical to the spirit of this beloved hobby. So Kolarik filed a petition, RM-11831 [PDF], to the U.S. FCC proposing a rule change to 'Reduce Interference and Add Transparency to Digital Data Communications.' And as the proposal makes its way through the FCC's process, it has stirred up heated debate that goes straight to the heart of what ham radio is, and ought to be. The core questions: Should amateur radio - and its precious spectrum - be protected purely as a hobby, or is it a utility that delivers data traffic ..."

Tech Salaries Worldwide 2019

Tech Salaries Worldwide 2019 - RF Cafe"Whoooo-hooo! Silicon Valley companies pay their tech workers more than anywhere else in the world, with the average engineer in San Francisco pulling down $145,000 last year, according to Hired's annual report on the state of engineering salaries. And, according to Hired, Bay Area salaries are up over last year, by two percent. That's something for tech professionals in the area to cheer about, yes? Not exactly. That 2% just keeps tech workers even with the U.S. rate of inflation but puts them behind local increases in the cost of living, which is 4% as calculated by the Bureau of Labor Statistics for April 2018 through April 2019. And salaries in other tech heavy areas ..."

Sprint to Test Aerial HAPSmobile System for LTE Connectivity

Sprint to Test Aerial HAPSmobile System for LTE Connectivity - RF Cafe"Sprint plans to test a High Altitude Platform Stations (HAPS) communications system for six months starting in November. Documents filed with the FCC show the carrier has asked for a “special temporary authority” to conduct demonstrations of experimental transmitters using spectrum frequencies ranging from the 1.9 GHz personal communications service (PCS) band and the 2.5 GHz broadband radio service (BRS) and educational broadband service (EBS) bands. The tests will be conducted with HAPSmobile, a joint venture between Sprint’s parent Softbank and AeroVironment that was formed in 2017 ..."









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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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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