Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Thank you for visiting RF Cafe!
Innovative Power Products Couplers

Homepage Archive - July 2020 (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

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 | of the July 2020 homepage archives.
col-width

Friday 17

Thursday 16

Wednesday 15

What Does Your Daily Commute Cost You?

What Does Your Daily Commute Cost You? - RF Cafe SmorgasbordHow far do you commute each day for the privilege of doing your part to push back the frontiers of technical ignorance and to boldly go where no engineer - or technician - has gone before. Do you know what the cost equates for you each year? This handy-dandy infographic lays out some gruesome numbers. Those with a weak stomach probably should pass on viewing this one. Here's a hint at what you will see: See that big $795 in the thumbnail image? That's the average cost per year for commuting -- per mile! Yessiree, if you live just 10 miles from work, you're losing nearly $8,000 per year, depending on you automobile type, on gas, tires, maintenance, devaluation, and loss of your personal time (which is valuable, after all). Back in the early 1990s I drove about 45 miles each way to Comsat, which took about 65 minutes due to miserable traffic, which is 130 minutes round-trip, or 2 hours and 10 minutes (about the run time of an average movie) each day. Figuring two weeks vacation and 10 holidays, that leave 48 weeks x 5 days/week = 240 days per year of commuting. 240 days x 130 minutes = 31,200 minutes = 520 hours per year. That's a fourth of a man-year (2,080 hours) on the road. It was a great job, but combined with working 60-70 hours per week...

ConductRF: Precision & Standard Grade RF Cable Assemblies

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! 

col-width

The Mathematics of Gaussian Probability Distribution

The Mathematics of Gaussian Probability Distribution - RF CafeEveryone reading the is familiar with the "bell curve," and most have been exposed to the mathematics of it. Standard deviations, normal distribution, mean, median, variance, etc., are seen often in technical writings. John Dunn has a good intro (or refresher) on the EDN website entitled, "The Mathematics of Gaussian Probability Distribution." It begins: "All sorts of physical processes in this analog world exhibit some degree of randomness. Think of noise, for example. Many noisy processes are described by Gaussian probability distributions. We should take a look at the mathematics of that. Consider the equation of the 'bell curve' for a Gaussian probability distribution by starting with a very simple equation..."

Worldwide 5G Frequency Bands

Worldwide 5G Frequency Bands - RF CafeThe everythingRF website has a short article on current 5G spectrum allocation around the world. Frequencies are added and/or removed occasionally depending on who controls the government agencies and which lobbyists have enough money to influence said officials. The chart was created in 2018 and promises to be updated as needed. Hopefully, the author is watching the industry and making adjustments as needed.

Virtual Ham Expo 2020

QSO Today's Virtual Ham Expo 2020 - RF Cafe

Thanks to the Wuhan Virus, QSO Today's Ham Expo 2020 will be an online-only event via your laptop, tablet, and smartphone. It will be held on the weekend of August 8th and 9th. "Participate in this ground breaking, virtual international amateur radio expo. Packed with world renowned speakers, exhibitors, and special conference rooms built on a virtual reality platform." More than 70 internationally renown are scheduled. Register by July 24th to receive early bird prize incentives. Register by July 24th for free attendance!

 

 

 

 

 

 

 

 

 

 

 

 

Tech Anagrams

A Decimal Point = I'm a Dot in Place

Eleven plus two = Twelve plus one

Dormitory = Dirty Room

Western Union = No Wire Unsent

The Morse Code = Here Come Dots

Silicon Graphics = A Long Chip Crisis / Can logic ship, sir? / Gosh, sir, I can clip!

 

   Comics with an Electronics Theme February 1967 Popular Electronics

 

  Electronics-Themed Comics June 1951 Radio-Electronics  

Engineering Job Opening

Promote Your Company on RF Cafe for as Little as $40/mo.

Sponsor RF Cafe for as Little as $40 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 13,000 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. If you need your company news to be seen, RF Cafe is the place to be. Advertising begins at $40/month.

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. Chances are you have never used a spreadsheet quite like this. 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...

RF & Electronics Symbols for Visio

RF Electronics Wireless Analog Block Diagrams Symbols Shapes for Visio - RF CafeWith more than 1000 custom-built symbols, this has got to be the most comprehensive set of Visio Symbols available for RF, analog, and digital system and schematic drawings! Every object has been built to fit proportionally on the provided A-, B- and C-size drawing page templates (or can use your own). Symbols are provided for equipment racks and test equipment, system block diagrams, conceptual drawings, and schematics. Unlike previous versions, these are NOT Stencils, but instead are all contained on tabbed pages within a single Visio document. That puts everything in front of you in its full glory. Just copy and paste what you need on your drawing. The file format is XML so everything plays nicely with Visio 2013 and later...

Get Your Custom-Designed RF Cafe Gear!

Custom-Designed RF-Themed Cups, T-Shirts, Mouse Pads, Clocks (Cafe Press) - RF CafeThis assortment of custom-designed themes by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins, Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart." My "Matchmaker's" design has been ripped off by other people and used on their products, so please be sure to purchase only official RF Cafe gear. My markup is only a paltry 50¢ per item - Cafe Press gets the rest of your purchase price. These would make excellent gifts for husbands, wives, kids, significant others, and for handing out at company events or as rewards for excellent service. It's a great way to help support RF Cafe. Thanks...

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...

col-width

Simulation Microscope Examines Transistors of Future

Simulation Microscope Examines Transistors of Future - RF Cafe"Since the discovery of graphene, two-dimensional materials have been the focus of materials research. Among other things, they could be used to build tiny, high-performance transistors. Researchers at ETH Zurich and EPF Lausanne have now simulated and evaluated one hundred possible materials for this purpose and discovered 13 promising candidates. With the increasing miniaturization of electronic components, researchers are struggling with undesirable side effects: In the case of nanometer-scale transistors made of conventional materials such as silicon, quantum effects occur that impair their functionality. One of these quantum effects, for example, is additional leakage currents, i.e. currents that flow 'astray' and not via the conductor provided between the source and drain contacts. It is therefore believed that Moore's scaling law..."

Photonic Microwave Generation Using On-Chip Optical Frequency Combs

Photonic Microwave Generation Using On-Chip Optical Frequency Combs - RF Cafe"In our information society, the synthesis, distribution, and processing of radio and microwave signals happen ubiquitously in wireless networks, telecommunications, and radars. The current tendency is to use carriers in higher frequency bands, especially with looming bandwidth bottlenecks due to demands for 5G and the Internet of Things. Microwave photonics, a combination of microwave engineering and optoelectronics, might offer a solution. A key building block of microwave photonics is optical frequency combs, which provide hundreds of equidistant and mutually coherent laser lines. They are ultra short optical pulses emitted with a stable repetition rate that corresponds precisely to the frequency spacing of comb lines. The photodetection of the pulses produces a microwave carrier..."

Plasmonic Chip for Ultrafast Data Transmission Using Light

Plasmonic Chip for Ultrafast Data Transmission Using Light - RF Cafe"Researchers from ETH Zurich have achieved what scientists have been attempting to do for some 20 years: in their laboratory work as part of European Horizon 2020 research projects, they have manufactured a chip on which fast electronic signals can be converted directly into ultrafast light signals - with practically no loss of signal quality. This represents a significant breakthrough in terms of the efficiency of optical communication infrastructures that use light to transmit data, such as fiber optic networks. In cities like Zurich, these fiber optic networks are already being used to deliver high-speed internet, digital telephony, TV, and network-based video or audio services (streaming). Today's optical networks achieve data transmission rates in the region of gigabits per second..."

Microwave Amplifier Circuit Using Flexible Wooden Film

Microwave Amplifier Circuit Using Flexible Wooden Film - RF Cafe"In the not-too-distant future, flexible electronics will open the door to new products like foldable phones, tablets that can be rolled, paper-thin [get it? paper - wood] displays and wearable sensors that monitor health data. Developing these new flexible / bendy products means using materials like new plastics and thin films to replace the rigid circuit boards and bulky electronic components that currently occupy the interiors of cell phones and other gadgets. New research by a University of Wisconsin-Madison engineer leverages a surprising and inexpensive substance - wood - to make the flexible microwave circuits that can power modern communications. In a paper published in the journal Nature Communications..."

Shiny Rainbows of Nanotech Chocolate

Shiny Rainbows of Nanotech Chocolate - RF Cafe"Chocolate is the latest material to be colorized by nanotechnology instead of chemical dyes. While so many of us are working at home during the [Wuhan Flu] pandemic, we do worry that serendipitous hallway conversations aren't happening. Last year, before the pandemic, it was one of those conversations that led researchers at ETH Zurich to develop a way of making chocolates shimmer with color - without any coloring agents or other additives. The project, announced in December, involves what the scientists call 'structural color.' The team indicated that it creates colors in a way similar to what a chameleon does - that is, using the structure of its skin to scatter a particular wavelength of light..."

 

 

 

 

 

 

 

 

 

 

Anatech Electronics (RF Filters) - RF Cafe withwave microwave devices - RF Cafe
LadyBug Technologies LB480A RF Power Sensor - RF Cafe
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...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free