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Homepage Archive - July 2019 (page 2)

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

2020:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
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
2014:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2013:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2012:  1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13


See Page 1 | 2 | 3 | 4 | 5 of the July 2019 homepage archives.
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Friday 12

Electronics Helix Puzzle

Electronics Helix Puzzle, July 1971 Radio-Electronics - RF CafeIn your final few minutes of the workweek, try your hand at this "Electronics Helix Puzzle," provided by Mr. James Kimsey in a 1971 issue of Radio-Electronics magazine. It it not as much of a challenge as a classical crossword puzzle, but is still worth attempting. In some ways, though, if you get stuck on a word there is more help available with a standard crossword because there are more than just two (the first and last letter in this case) intersecting letters available to help. If after completing this Electronics Helix Puzzle you would like to try your hand at one of those traditional type crossword puzzles, consider working one (or more) of my weekly ...

The Wi-Fi 6 Revolution Is a Wakeup Call for Your Test Strategy

Rohde & Schwarz The Wi-Fi 6 Revolution is a Wakeup Call for Your Test Strategy - RF CafeRohde & Schwarz has published a new whitepaper entitled "The Wi-Fi 6 Revolution Is a Wakeup Call for Your Test Strategy." The new IEEE 802.11ax amendment (Wi-Fi 6) intends to improve the WLAN system efficiency, focusing on the throughput per station in dense and outdoor environments. Wi-Fi 6 allows for the first time the scheduled communication of several stations (STA) at the same time, to and from the access point (AP) by introduction of OFDMA. It enables several stations to serve simultaneously in order to improve overall capacity, latency and efficiency in high-density environments. Resource units (RU) are introduced to split the available spectrum ...

Promote Your Company on RF Cafe for as Little as $45/Month

Sponsor RF Cafe for as Little as $35 per Month - RF CafeRF Cafe typically receives 8,000-15,000 website visits each weekday and about half that on weekends. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 7,000 pages in the Google search index, RF Cafe returns in favorable positions on many types of key searches, both for text and images. New content is added on a daily basis, which keeps the major search engines interested enough to spider it multiple times each day. Items added on the homepage often can be found in a Google search within a few hours of being posted. I also re-broadcast homepage items on LinkedIn, Facebook, and Twitter. If you need your company news to be seen, RF Cafe is the place to be. Banner advertising begins at $175/month ...

Tips for Technicians

Tips for Technicians, May 1967 Electronics World - RF CafeI know I keep saying this, but it keeps being true so I say it again: The basics of electricity and electronics have not changed in the last 50 or more years, so these articles from vintage issues of electronics magazines are as applicable today as they were back then. If you are just getting into the field of electronics, valuable information can be found here to supplement your learning process. In fact, I have seen examples in some of these articles where I re-learned something long-ago forgotten, and some of the stuff is rarely, if ever, seen in contemporary writings. Regardless, making yourself aware of the work done by pioneers in the industry is always valuable because it gives you a sense of approaches taken that have led to success, and sometimes ...

Nokia's SAC Wireless Recruits Military Vets as Cell Tower Installers

Nokia's SAC Wireless Recruits Military Veterans as Cell Tower Installers - RF Cafe"There's been talk about a serious shortage of cell tower installers and technicians to roll out the necessary infrastructure for 5G. And now, Nokia is giving some credence to the reality of that shortage. Nokia and its subsidiary SAC Wireless are actively recruiting and training military veterans for tower climber jobs. SAC Wireless specializes in site development, engineering design, construction and equipment installation, and operations and maintenance. The Nokia subsidiary works with telecom carriers, major tower owners, and original equipment manufacturers across the United States ...'"

ERZIA: Microwave & mm-Wave Modular Amplifiers

Many Thanks to ERZIA for Continued Support!ERZIA serves critical aerospace and defense missions by designing and manufacturing RF, microwave, and mm-wave amplifiers, integrated assemblies operating from low frequencies up to 100 GHz, and by providing high reliable satellite communications. The company was founded in 2002 to become a worldwide reference of advanced engineering, performance, reliability and ruggedness. Their catalogue of standard amplifier modules comprises more than 100 different models, having also a high capacity of customization for amplifiers and integrated assemblies. Some of products have space heritage and are used in aerospace, commercial, military and scientific systems, having a wide range of final applications.

Thursday 11

Practical Log-Periodic Antenna Designs

Practical Log-Periodic Antenna Designs, May 4, 1964 Electronics Magazine - RF CafeDesigning a log periodic antenna is a piece of cake. Just punch in your computer program or smartphone app a few parameters for frequency range, power handling, directivity, impedance, etc., and out pops boom and element lengths, diameters, and spacings - and probably radiation gain profiles for elevation and azimuth. That is the way it's done today. However, when Dwight Isbell and Raymond DuHamel of the University of Illinois came up with the log periodic concept in 1958, they did not have the convenience of a computer or even a hand-held calculator. Slide rules and logarithm tables were the order of the day. After trudging through the equations for building the antenna ...

Skyworks' 802.11ax (Wi-Fi 6) Front-End Modules

Skyworks' 802.11ax (Wi-Fi 6) Front-End Modules - RF CafeSkyworks Solutions, an innovator of high performance analog semiconductors connecting people, is pleased to introduce the SKY85330-21, a 2.4 GHz front-end module (FEM) and the SKY85748-11, a 5 GHz FEM for enterprise 802.11ax (Wi-Fi 6) applications including access points, routers and gateways. SKY85748-11, 5 GHz FEM Features: Integrated 802.11ax 1024 QAM, 5 GHz PA, LNA with bypass, and T/R switch Fully-matched input and output Integrated logarithmic power detector Transmit gain: 32 dB Receive gain: 13 dB Small QFN (16-pin, 2.5 x 2.5 mm) package ...

Carl and Jerry: Off to a Bad Start

Carl and Jerry: Off to a Bad Start, September 1961 Popular Electronics - RF CafeIt was only the first day at engineering college and already their first familiar techno-caper was underway. Indiana's Parvoo University was about to get an initiation into the world of Carl Anderson and Jerry Bishop, who during their high school years together solved many a mystery and pulled many a prank in their hometown somewhere in northern Indiana. As with all of John Frye's tales this one mixes serious electronics topics with a bit of fun and a life lesson. There were no 'bad guys' here as in many other episodes, but the boys did get an unexpected introduction to Parvoo U.'s president! Despite the story's title, the day ended well ...

Many Thanks to Res-Net Microwave for Continuing Support!

Res-Net Microwave componentsRes-Net Microwave has a complete line of precision RF & microwave components including attenuators, terminations, resistors, and diode detectors for commercial, military, and space applications. Products range from the small flange type to large 2,000 watt connectorized power attenuators and/or terminations at frequencies up to 26.5 GHz. In-house photo etch and laser trim capability. Please check out Res-Net Microwave's website to see how they can help with your current project.

Notable Quote: Neil Armstrong

Notable Quote: Neil Armstrong - RF Cafe"It's an interesting place to be. I recommend it." – Neil Armstrong re having visited the moon. That remark came during a CBS 60 Minutes interview in November 2005. We are approaching the 50th anniversary of the Apollo 11 moon mission, and yes, America was great for having achieved it. You might also interested in knowing that Neil Armstrong was an aeronautical engineering graduate of Purdue University, ostensibly the alluded-to "Parvoo University" that teenage electronics sleuths and Ham radio aficionados Carl & Jerry attended. 

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.

JETCOOL Wins Top Startup Award Cooling Approach

JETCOOL Wins Top Startup Award Cooling Approach - RF Cafe"At the 2019 IEEE IMS in June, JETCOOL Technologies unveiled their new approach to cooling computer processors and other electronics and won the title of Next Top Startup. Their technology could change the way the world cools the electronics powering aerospace, electric vehicles, and AI data centers. The technology, known as microconvective cooling, uses small fluid jets that can be built within the electronic device. The result is ten times better cooling than today's state-of-the-art, which is welcome news to overclocking enthusiasts and high-power ..."

Wednesday 10

Belmont Model 678 Auto-Radio Set Radio Service Data Sheet

Belmont Model 678 Auto-Radio Set Radio Service Data Sheet, August 1940 Radio-Craft - RF CafeUnlike even the vacuum tube type AM radio in the dashboard of my parents' car in the early 1960s that were self-contained units, even earlier radios designed for cars and trucks had their bulky electronics mounted under the sea or in the trunk, with a remote volume and tuning control mounted in the dashboard. That greatly complicated the installation as well as the design of the radio. This circa 1940 Belmont Model 678 Auto-Radio is a prime example. Note the unique cylindrical shape of the radio chassis, and that the remote control is a pushbutton assembly with rotating knobs for tuning and volume. Operating from a 6 volt DC car battery (12 volts came later), these radios required a "vibrator" circuit to convert DC to AC (and back to a higher level DC) in order to transform to a couple hundred volts for the plate voltage of the tubes ...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features ... 

Anatech Electronics July 2019 Newsletter

Anatech Electronics July 2019 Newsletter - RF CafeAnatech Electronics, an RF and microwave filter company, has introduced a new line of suspended stripline and waveguide type RF filters. Sam Benzacar wrote as part of Anatech's July newsletter about the need for and emergence of fully integrated millimeter-wave transmitters and receivers for the 5G smartphone market. It is worth noting that the phrase "5G smartphone market" is not redundant since 5G is intended to go well beyond just phones. Vehicle-to-vehicle communications and factory automation are just two of the many other applications planned and currently being implemented. Also included are a few news headlines related to Anatech's core business of designing and manufacturing filters ...

Radio Measurements in Space

Radio Measurements in Space, May 1967 Electronics World - RF CafeThe first thing I learned (or re-learned) in reading this article is that in 1967, "Hertz" had only recently been assigned as the official unit of frequency. According to Wikipedia, International Electrotechnical Commission (IEC) adopted it in in 1930, but it wasn't until 1960 that it was adopted by the General Conference on Weights and Measures (CGPM) (Conférence Générale des Poids et Mesures). Hertz replace cycles per second (cps). The next thing that happened was that I was reminded of how images such as the op-art tracing of antenna oscillation that are routinely generated today ...

Thanks to QuinStar Technology for Their Support

QuinStar Technology mm-Wave Products - RF CafeQuinStar Technology designs and manufactures mm-wave products for communication, scientific, and test applications along with providing microelectronic assembly, rapid prototyping, and mass customization. Amplifiers, Oscillators, Switches, Attenuators, Circulators, Isolators, Filters, Waveguide, Antennas, Phase Shifters, Transceivers, Mixers, Detectors. QuinStar specializes in cryogenic amplifiers, circulators, and isolators. Please visit QuinStar today to see how they can help your project.

Drone Explode into Maple Seed Microdrones in Midair

Drone Explode into Maple Seed Microdrones in Midair - Airplanes and RocketsThis is über-cool. "As useful as conventional fixed-wing and quadrotor drones have become, they still tend to be relatively complicated, expensive machines that you really want to be able to use more than once. When a one-way trip is all that you have in mind, you want something simple, reliable, and cheap, and we've seen a bunch of different designs for drone gliders that more or less fulfill those criteria. For an even simpler gliding design, you want to minimize both airframe mass and control surfaces, and the maple tree provides some inspiration in the form of samara, those distinctive seed pods that whirl to the ground ..."

RF & Connector Technology: Coax Connectors, Cable, Passive Components

RF & Connector Technology - RF CafeProviding full solution service is our motto, not just selling goods. RF & Connector Technology has persistently pursued a management policy stressing quality assurance system and technological advancement. From your very first contact, you will be supported by competent RF specialists; all of them have several years of field experience in this industry allowing them to suggest a fundamental solution and troubleshooting approach. Coaxial RF connectors, cable assemblies, antennas, terminations, attenuators, couplers, dividers, and more. Practically, we put priority on process inspection at each step of workflow as well as during final inspection in order to actualize "Zero Defects."

Tuesday 9

The Operational Amplifier: What It Is & How It Works

The Operational Amplifier: What It Is & How It Works, August 1971 Popular Electronics - RF CafeIC designers have been striving to make the "ideal" opamp ever since the device type was first conceived. An ideal opamp has a certain set of well-defined properties that permit it be used in circuits defined by neat mathematical equations without the need for compensating or limiting terms. An example of compensation might be having an input impedance of something other than infinite ohms that causes a voltage division effect on the input voltage, and a limitation would be a gain-bandwidth product that prevents it from being used in high frequency applications. Opamps appeared in electronics before semiconductors came onto the scene, and a couple companies attempted to market prepackaged vacuum tube opamps that plugged into a standard octal kind of socket . EE120 at the University of Vermont introduced me to operational amplifier theory ...

Thanks to VidaRF for Many Years of Supporting RF Cafe!

vidaRF passive RF & microwave components - RF CafeAt VidaRF, the phrase 'Providing Simple Solutions for Complex Connections' is more than just a slogan – it's a mindset, a mission, and a driving force behind everything we do. Their pledge is to design and distribute high performance, cost effective RF Microwave products to fit each customer's unique applications. Please visit VidaRF today to see how their lines of Attenuators & Terminations, Directional Couplers, Power Dividers, Coaxial Connectors, and Circulator & Isolators can be of use to your project. "When the standard just will not do, VidaRF has the solution for you!"

Radar and LORAN

Radar and Loran, July 1959 Popular Electronics - RF CafeMostly just old farts like me remember anything about LORAN (LOng RAnge Navigation). My familiarity with it came not from boat navigation, but from airplane navigation. Before LORAN became totally obsolete due to GPS (phased out in U.S. and Canada in 2010), the transmitter stations were commonly tuned in in order to obtain positional fixes via triangulation. Whilst taking flying lessons at Lee Airport, in Edgewater, Maryland, the ground instructor included it in the lessons, and even the FAA Private Pilot exams had a question or two on LORAN. The el cheapo Piper Colts that I flew were lucky to have a VOR (VHF omnidirectional range ) receiver in it, so I never actually used LORAN. They did have direction finders (DF), which could tune in, among other things, VHF television station channels ...

Webinar: Accelerating Test Automation Development

Accelerating Test Automation Development - RF CafeOn July 17, at 1 pm ET, Keysight Technologies will host a webinar presented by Alistair Scott entitled "Accelerating Test Automation Development." Test engineers are under constant pressure to reduce the total cost of test, and at the same time, get products through testing faster. Learn steps that will accelerate your test workflow. 3 key topics are: Learn where test engineers spend non-value-added time. Learn how test engineers are using automation to accelerate test workflows. Learn how collaborative tools can make your workgroup more efficient. Registration is required for the free event.

Open Schools Coding Competition Promotes Computer Science

Open Schools Coding Competition Promotes Computer Science - RF Cafe"Over 100 students attended the OSCC, held at the University of Surrey on the 24th June. 17 teams from 11 schools created and submitted apps for the competition's final. OSCC-students-652 The event, now in its third year, was co-hosted by Red Hat, Lord Wandsworth College and the University of Surrey. Participating students were tasked with creating an app to help any local charity of their choice. The competition's stated goal was to 'inspire the UK's next generation of digital talent,' by introducing students to basic coding, illustrating the opportunities a STEM education can provide, and demonstrating the value of open source collaboration. A short introductory lecture from Stella Kazamia, teaching fellow in the Department of Computer Science ..."

R&S USA: RF & Microwave, Analog, Digital, & Optical Test Equipment

Rohde & Schwarz USA Pocket Guides - RF CafeRohde & Schwarz develops, produces and markets test & measurement, information and communications technology. Focus is on test and measurement, broadcast and media, cybersecurity, secure communications, monitoring and network testing. Markets serviced are wireless, the automotive industry, aerospace and defense, industrial electronics, research and education, broadcast and media network operations, consumer electronics, cybersecurity for business and governments, communications and security solutions for critical infrastructures and the armed forces, reconnaissance equipment for homeland and external security, and much more.

Monday 8

Mac's Radio Service Shop: What's Right with the Service Business

Mac's Radio Service Shop: What's Right with the Service Business, May 1955 Radio & Television News - RF CafeAll types of sales and repair services get accused of ineptness of skill which requires more time than necessary, overcharging for parts and/or labor, underhandedness in faking problems and selling unnecessary replacement parts, improper customer interfacing, sloppiness in appearance and/or work environment, failure to arrive on time for appointments, etc. Some of the most often cited these days are auto mechanics, cellphone repairers, home improvement contractors, lawn care, and builders. Up until about a decade ago when cellphone repair began to dominate over computer repair, the latter was a big source of complaints. In the 1950s and 60s, it was TV and radio repairmen who took a lot of abuse not just from their customers, but from large, organized electronic service conglomerates and were abetted by mostly ignorant media outlets looking for a good story ...

Free Engineering Magazines for July 2019

Engineering White Papers & Books, July 2019 - RF CafeWhitepapers, pamphlets, books, magazines, and chapter examples listed here are a small sample of a lot of new items that are offered for FREE through TradePub. The publishers make them available to qualifying people as a promotional campaign for their full line of offerings. Whitepaper topics include careers, manufacturing, and engineering, while magazine titles include Microwave Engineering Europe, Electronic Design, and Microwave Product Digest. Note: I earn a few pennies (literally) when you download one of these or the many other pubs available, so please help yourself.

ConductRF Intros TESTeLINK RF Test Cables - RF CafeConductRF introduces its TESTeLINK RF Test Cables. Key features include: Flexible cable construction, Low VSWR performance, Optimized low loss at max frequency, Phase matched sets available, High shielding effectiveness, Broad connector solution choices, and Custom marking & ruggedizing options. Examples are attenuation <1.04 db/ft @ 50 GHz (TSA72)and <2.07 db/ft @ 67 GHz (PFA61). Shielding effectiveness of >-100 dB to 18 GHz. Please contact ConductRF today for help with your project's needs.

Many Thanks to Nova Microwave for Continuing Support!

Nova Microwave circulators & isolatorsNova Microwave is a leader in technically differentiated electronic and radio frequency Ferrite Circulators and Isolators that connect, protect and control critical commercial and military wireless telecommunications systems. Our staff is dedicated to research and development of standard and custom design quality Ferrite Circulators and Isolators from 380 MHz to 26.5 GHz. Please visit Nova Microwave today.

WWII Era Electronics Advertisements in QST Magazine

Cool Pic - WWII Era Electronics Advertisements in QST MagazineMaybe it comes from having crossed the half-century Rubicon, but with increasing frequency I find myself seeking out vintage magazines to learn how the world used to be. I am a realist who has no misconceptions about how idyllic things used to be and that today is utter debauchery, but it is apparent from a lot of the publications that we surely have changed significantly in the last 50+ years - better in some ways, worse in others. For many years I have been purchasing of WWII era QST magazines off eBay. As I have been doing for a while on my Airplanes and Rockets website, I am going to begin scanning and posting vintage electronics magazine advertisements and articles. A lot of the information is timeless in its application, especially since vacuum tubes are still in widespread use in the Amateur Radio realm. Of course electronics ...

How and When to Use Thermal Chambers for Testing

How and When to Use Thermal Chambers for Testing - RF CafeThe Evaluation Engineering website posted this article by TotalTemp Technologies' John Booher entitled, "How and When to Use Thermal Chambers for Testing." It begins: "The components and subassemblies of any piece of equipment or machinery were developed with the environmental conditions of where it would be operating in mind. This article explains the key factors that determine how thermal testing is put to use. Have you ever wondered what journey a piece of equipment or machinery took before ending up in space? Or what testing was done before the rocket's blastoff? Or why a piece of equipment failed prematurely? Well somewhere ..."

Maskless Exposure to Slash Costs of Back-End Lithography

Maskless Exposure to Slash Costs of Back-End Lithography - RF Cafe"Wafer bonding and lithography equipment provider EV Group (EVG) has unveiled a maskless lithography technology specifically developed for the back-end lithography requirements of advanced packaging, MEMS, biomedical and high-density PCB applications. Dubbed MLE (for Maskless Exposure), the technology is said to be scalable for high-volume manufacturing, combining a patterning resolution better than 2 µm in any arbitrary direction with digitally programmable layouts that eliminate the significant overhead costs associated with photomasks ..."

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 227,460 products from more than 1210 companies across 285 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.

Sunday 7

Engineering & Science Crossword Puzzle for July 7

Engineering & Science Crossword Puzzle July 7, 2019 - RF CafeThese custom-made engineering and science-themed crossword puzzles are done weekly for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. The jury is out on whether or not this type of mental challenge helps keep your gray matter from atrophying in old age, but it certainly helps maintain your vocabulary and cognitive skills at all ages. A database of thousands of words has been built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical ...

   
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About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

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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