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 RF Engineering Quizzes Notable Quotes App Notes Calculators Education 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 Thank you for visiting RF Cafe!
everythingRF RF & Microwave Parts Database (h2) - RF Cafe

Homepage Archive - January 2021 (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

2021:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
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 January 2021 homepage archives.
col-width

Friday the 15th

Biggest "Portable" Radio

Biggest "Portable" Radio, July 1945 Radio-Craft - RF Cafe"Portable" is a matter of perspective when it comes to large systems. Anything that can be put on wheels and moved over land is technically portable, but the speed at which it can be brought into operation once relocated is what really defines whether something is portable or not. To be truly portable, all of the requisite support equipment must travel with it; e.g., electric generators, fuel, water, food, personnel facilities (if needed), etc. The MPN−14 portable airport surveillance radar (ASR) and precision approach radar (PAR) unit I worked on in the USAF truly qualified since it was entirely self-contained and the necessary power generators were supplied by a separate shop within the 5th Combat Communications Group to which I belonged. Other shops provided creature comfort facilities, ground-based and satellite radio communications, tactical air navigation (TACAN), security, and managerial services. A few times each year we had what were called "Healthy Strikes" where claxons would sound in the barracks...

CMT Webinar: Materials Measurement at 5G Frequencies

Copper Mountain Technologies Master Class Webinar: Materials Measurement at 5G Frequencies - RF CafeOn Wednesday, January 20th at 2:00 PM EST (GMT -5:00), Copper Mountain Technologies will present another of its VNA Master Class Webinar series entitled "Materials Measurement at 5G Frequencies." This webinar will demonstrate the use of free-space spot probes to characterize materials at 20 to 40 GHz, of interest to new 5G millimeter wave frequencies. A table-top measurement system using CMT's S5243 VNA will be used to determine transmission and/or reflection of materials. From these measurements, the webinar will discuss the calculation of dielectric properties of measured materials. The agenda consists of free space measurement description, example measurements & dielectric calculation and a Q&A session at the end...

Why Radio Astronomers Need Quiet in a WA Desert

Why Radio Astronomers Need Quiet in a WA Desert - RF CafeHa, I thought WA referred to Washington state, but not so. It's a good thing because I was going to accuse them of using a phony photo that includes the Large and Small Magellanic Clouds which are not visible from Washington! "A remote outback station about 800 km north of Perth in Western Australia is one of the best places in the world to operate telescopes that listen for radio signals from space. It's the site of CSIRO's Murchison Radio-astronomy Observatory (MRO) and is home to three telescopes (and soon a fourth when half of the Square Kilometre Array, the world's largest radio telescope, is built there). But it's important these telescopes don't pick up any other radio signals generated here on Earth that could interfere with their observations. That's why the observatory was set up with strict rules on what can and can't be used on site..."

Hi Tide in the Tweeter

Hi Tide in the Tweeter, October 1956 Popular Electronics - RF CafeBefore the current generation began destroying its hearing with smartphone earbuds, their parents and grandparents (that includes mine) destroyed our hearing with ridiculously powerful loudspeakers, often in boom boxes perched on shoulders right next to the ears (not me). The "concert hall" - or concert auditorium - experience has been long sought-after since recorded music has been available, which has only been about a century. As evidenced by the sudden increase in articles and advertisements in my growing collection of vintage electronics magazines, the early and mid 1950s saw a sudden swell of articles promoting the equally swelling supply of high fidelity (hi-fi) recording and playback equipment hitting the markets. Subjects ranging from homebuilt projects to reports of top end commercially products filled the pages each month. Television saw the same treatment in the late 1950s and early 1960s. All, of course, relied on vacuum tubes - with just enough relatively expensive semiconductors...

Qorvo Unleashes Full 6 GHz Performance with New Wi-Fi 6E FEMs

Qorvo® Unleashes Full 6 GHz Performance with New Wi-Fi 6E FEMs - RF CafeQorvo, a leading provider of innovative solutions that connect and power the world, today introduced two Wi-Fi 6E front end modules (FEMs) designed to maximize throughput and range in high-bandwidth applications such as 8K video streaming, online gaming and virtual reality. Wi-Fi 6E is an extension of Wi-Fi 6 that operates in the recently opened 6 GHz frequency band, in addition to the traditional 2.4 GHz and 5 GHz bands. Wi-Fi 6E triples Wi-Fi capacity with contiguous spectrum to accommodate 7 additional 160 MHz-wide channels or 14 additional 80 MHz channels. Qorvo's Wi-Fi 6E FEMs unleash the full potential of this new spectrum, delivering leading linearity performance and maximizing throughput and capacity at peak permissible indoor power levels. The Qorvo QPF4656 and QPF4632 deliver robust and rugged performance with world-class energy...

Thanks to ConductRF for Long-Time Support!

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

 

 

 

 

 

RfCaFe

 

autodidacts

Operation Chaos

   Operation Chaos 

Heathkit 1982 Christmas Catalog

Heathkit Christmas 1982 Catalog - RF Cafe

 

 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 (click here for screen capture). 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

BAE Systems Developing Weapon Data Link Radio for Hypersonic Weapons - RF Cafe"U.S. military researchers needed a weapon data link radio to help steer hypersonic weapons to their targets. Officials of the U.S. Defense Advanced Research Projects Agency (DARPA) in Arlington, Va., announced a $4 million contract to BAE Systems last month to develop two weapon data link prototypes for test and integration of the future hypersonic Tactical Boost Glide (TBG) vehicle. The TBG program is a joint DARPA and U.S. Air Force effort to develop technologies for future air-launched, tactical-range hypersonic boost glide systems. Boost glide uses a rocket to accelerate a weapon payload to high speeds, after which the payload then separates from the rocket and glides unpowered to its destination..."

Bound-Charge Engineering: Strategy to Develop Nanowire Transistors

Bound-Charge Engineering: A New Strategy to Develop Nanowire Transistors - RF Cafe"In recent years, physicists and electronic engineers have been trying to identify materials that could be used to fabricate new types of electronic devices. 1-D and 2-D materials have been found to have particularly advantageous characteristics, particularly for the development of new generations of nanoelectronics (electronic components at the nano scale). Such 1-D and 2-D materials, such as graphene, monolayer molybdenum disulfide, silicon nanowires and silicon nanosheets, could also play a crucial role within the semiconductor industry, as they could help to develop increasingly small transistors. Despite their well-documented advantages, emerging low-dimensional materials can have a relatively small amount of so-called free charges compared to 3-D materials. In the context of electronic components, a free charge is an electron or hole..."

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Triad RF Systems PCB Directory (Design)
Windfreak Technologies LOTUS Communications Systems Modular RF Component Building Blocks - 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