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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...

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

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Homepage Archive - May 2021 (page 1)

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 of the May 2021 homepage archives.
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Friday the 7th

Electronic Assembly Technician Needed by Triad RF Systems

Electronic Assembly Technician Needed by Triad RF Systems - RF CafeTriad RF Systems is a fast-growing leader in the design and manufacture of RF power amplifiers and radio systems. We are looking for an experienced Electronic Assembly Technician to support our growth. This position will work in our Assembly Team under the direction of our Production Manager. Required skills and qualifications include assembles electronic components, assemblies, subassemblies, RF modules and systems with work orders and visual work instruction as directed by the Production Manager. Performs mechanical assembly operations while building electronic assemblies using standard measuring tools and techniques, performs electronic assembly operations such as wire termination, and installation...

Sangamo Electric Company

Sangamo Electric Company, May 1950 Radio & Television News - RF CafeRemember the Sunday comics feature for kids where there was a picture drawn with things wrong in it, and you had to find them all? This 1950 advertisement for the Sangamo Electric Company's line of capacitors, which appeared in Radio & Television News magazine, could server as a modern-day version for the Cancel Culture "woke" crowd that believes it has a duty to criticize and impugn everything it happens to fear, not like, or not understand. My list is at the bottom of the page if you want to compare it to yours. On other Sangamo ad post pages I have provided a bit of research on the background of "Samgamo" to try to determine whether the use of Native Americans (aka "indians" at the time) was based on a local tribe. No link has ever been found. Below the ad are a few of the items discovered...

Rainy Day Amusements, 1982 Old Farmer's Almanac

Rainy Day Amusements, 1982 Old Farmer's Almanac - RF CafeThe "Rainy Day Amusements" feature was not usually a mathematical challenge; for that, see the "Old & New Mathematical Puzzles" section. Some years they were worthwhile, end others not so much so. 1982 was a pretty good year for Rainy Day Amusements, so they are included here. Each autumn I used to anxiously await the appearance of the newest edition of The Old Farmer's Almanac on the store shelf, and such was the case with this 1982 issue. It is not that I was/am an avid farmer, just that I enjoy reading the anecdotes, tales, and interesting historical tidbits included amongst the pages along with tables of high and low tides, moon and sun rising and setting times...

CENOS Affordable Simulation Software for Antenna Design

CENOS Launches Affordable and Easy-to-Use Simulation Software for Antenna Design - RF CafeElectromagnetics simulation software company CENOS continues on its mission to democratize simulation software by releasing its newest application designed for radio frequency and antenna design engineers. After a year of development and testing in close cooperation with its avid beta-tester community, the Antenna Design simulation software was finally released for public use at the end of April, 2021. CENOS Antenna Design is an intuitive FEM-based software that helps engineers to speed up RF antenna design, it solves Maxwell’s equations directly with no simplifications or limitations. CENOS Antenna Design is free to try for 10 days, after which the users can choose from the two subscription plans - for an individual or business use, starting from €20/mo ($25/mo)...

Many Thanks to Berkeley Nucleonics for Continued Support!

Berkeley Nucleonics Corp - RF CafeBerkeley Nucleonics Corporation (BNC) is a leading manufacturer of precision electronic instrumentation for test, measurement, and nuclear research. Founded in 1963, BNC initially developed custom pulse generators. We became known for meeting the most stringent requirements for high precision and stability, and for producing instruments of unsurpassed reliability and performance. We continue to maintain a leadership position as a developer of custom pulse, signal, light, and function generators. Our designs incorporate the latest innovations in software and hardware engineering, surface mount production, and automated testing procedures.

Thursday the 6th

Origin of "HAM" for Amateur Radio Operators

Origin of the Name "HAM" for Amateur Radio Operators - RF CafeThis story was posted sometime around 2009. Since that time, research has been conducted by members of the Harvard College Wireless Club regarding the veracity of the claim. RF Cafe visitor Fred Hopengarten, Esq. (K1VR), wrote to apprise me of the situation. It concludes as follows: "Back in 1999, the late K3UOC, who received his Ed.D. from the Harvard Graduate School of Education and was very active with our club, wrote: Note: This legend has been published and told by word-of-mouth countless times over the past 90 years. Unfortunately, it isn't so. HWC members researched this story, even obtaining the copy of the Congressional Record for the date in question. We could find no record of Mr. Hyman appearing before congress. We have to admit, though, it's a very entertaining story!"

New for 2021! RF & Electronics Stencils for Visio

RF & Electronics stencils for Visio r4 - RF CafeWith more than 1000 custom-built stencils, this has got to be the most comprehensive set of Visio Stencils 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). Stencils 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...

Fundamental Crystal Control for Ultra-High Frequencies

Fundamental Crystal Control for Ultra-High Frequencies, April 1932 QST - RFCafeYou always need to pay careful attention to "breakthrough" type articles when they appear in April issues, since many magazines have a tradition of burying an "April Fools' Day" item without notice. This April 1932 issue of QST magazine seems to be legitimate. The term "lycopodium pattern" aroused my suspicion, but it turns out to refer to a pattern of vibration that resembles the needle orientation of certain pines and cedars. As radio frequencies continued to increase during the early years of "wireless" development, the use of quartz crystals as a stable reference source ran into a physical limitation because as crystal slices reached a certain thinness, overtone and subharmonics appeared that caused problems in circuits. A new mineral called tourmaline saved the day. With an elasticity much greater than quartz, tourmaline is able to vibrate at higher fundamental frequencies for a given thickness...

Senior RF Engineer Wanted by Triad RF Systems

Senior RF Engineer Wanted by Triad RF Systems - RF CafeTriad RF Systems is a fast-growing leader in the design and manufacture of RF power amplifiers, bidirectional amplifiers, and RF systems. We are looking for a Senior RF Design Engineer to join our team in New Jersey. The Senior RF Design Engineer will lead the development of new SSPA and transmit / receive products for our rapidly expanding catalog and customer base. Required skills and qualifications include Bachelor's degree in Electrical Engineering or equivalent related experience, minimum 5 years professional experience in RF engineering, experience with the simulation, design, test, and realization of RF power amplifiers and low noise receiver front-ends operating up through C Band, SSPA design knowledge or experience up to 50 W...

Exodus Intros 1-2 GHz, 4 kW SS Pulse Amplifier

Exodus Advanced Communications Intros 1-2 GHz, 4 kW Solid State Pulse Amplifier - RF CafeExodus Advanced Communications' AMP2043P-4KW Solid State Pulse Amplifier (1.0-2.0 GHz, 4 kW Pulse) is designed for Pulse/HIRF Mil-Std 461/464 and Radar applications. Other frequency ranges & power levels available all providing Superb Pulse Fidelity. Up to 100 μsec pulse widths, 6% duty cycles and 66 dB gain. Available monitoring parameters for Forward/Reflected power, VSWR, voltage, current, temperature sensing for outstanding reliability and ruggedness in a 10U chassis. Features Small form factor rack-mounted system, Class AB linear advanced technology design, instantaneous L-Band octave bandwidth, linear high peak pulse applications, designed for EMI/RFI, lab, HiRF/pulse applications...

Many Thanks to LadyBug Technologies for Their Continued Support!

LadyBug Technologies RF Power Sensors - RF CafeLadyBug Technologies was founded in 2004 by two microwave engineers with a passion for quality microwave test instrumentation. Our employees offer many years experience in the design and manufacture of the worlds best vector network analyzers, spectrum analyzers, power meters and associated components. The management team has additional experience in optical power testing, military radar and a variety of programming environments including LabVIEW, VEE and other languages often used in programmatic systems. Extensive experience in a broad spectrum of demanding measurement applications. You can be assured that our Power Sensors are designed, built, tested and calibrated without compromise.

Wednesday the 5th

Electronics-Themed Comics: Radio Term Illustrated

Electronics-Themed Comics: Radio Term Illustrated, April and May 1946, Radio-Craft - RF CafeHere is another trio of vintage electronics-themed comics from Radio-Craft magazine. Two are part of illustrator Frank Beaven's "Radio Terms Illustrated" series, where readers would write in with suggestions and Mr. Beaven would put the ideas in ink. These two are "Poor Reception, and "Regeneration." If you look at the bottom of the page, you will find a big listing of other comics, with many of the other "Radio Terms Illustrated" instances ("High Potential," "Signal Generator," "Overload Capacity," "Amplitude," "Transmission Loss," etc.) labeled. Enjoy!

Mathematical Puzzles, 1982 Old Farmer's Almanac

Mathematical Puzzles, 1982 Old Farmer's Almanac - RF CafeEach autumn I used to anxiously await the appearance of the newest edition of The Old Farmer's Almanac on the store shelf, and such was the case with this 1982 issue. It is not that I was/am an avid farmer, just that I enjoy reading the anecdotes, tales, and interesting historical tidbits included amongst the pages along with tables of high and low tides, moon and sun rising and setting times, astronomical events, and weather patterns expected for the year that lay ahead. Most of all, I liked working the puzzles and riddles. Over the years the difficulty levels gradually got lower and lower (aka dumbed down), to the point where for the last decade or so I have not even bothered buying the OFA. Now it is full of numbnut stuff. Because quite a few of the Mathematical Puzzles from the older editions are worthy of an engineer's cerebratio

Webinar: Pulse Stability Measurement of Radar Signals

Webinar: Pulse Stability Measurement of Radar Signals - RF CafeRohde & Schwarz has produced a webinar entitled "Pulse Stability Measurement of Radar Signals," which is available for viewing on their website. They appreciate your registering, but if for some reason it doesn't work, click on the thumbnail above to go directly to it. "With the arrival of sophisticated radar and communication systems, phase noise has become the most important factor engineers focus on during the design and validation phase. Phase stability is the key parameter for defining target acquisition in radars, spectral integrity in communication systems and precision beam steering capabilities in active electronic scanned array antennas (AESA)..."

The Conical Monopole Antenna

The Conical Monopole Antenna, November 1966 QST - RF CafeIt is important to concentrate your transmitter power into the proper beam if you wish to deliver the best signal to the other fellow's receiving antenna. This has logically led to the popularity of the Yagi beam antenna on the higher-frequency amateur bands. A beam antenna for the 80-meter band should have a 140-foot reflector and a 77-foot boom on a 250-foot tower. This makes the beam antenna impractical for the 80-meter band, and even for 40-meter operation a full-size Yagi is a forbidding structure to the neighbor's narrow-minded view - even a well-trained XYL might view such a monster beam with alarm. There is no easy solution to the need for a good DX antenna at low frequency, but the conical monopole antenna may be of interest to the more eager radio amateur as a more practical solution. The conical monopole antenna is a base-fed vertical antenna that has an omni-directional pattern in azimuth but with an elevation...

Axiom Blog: Test Equipment Are Investments in Low Carbon Footprint

Axiom Blog: Test Equipment Are Investments in Low Carbon Footprint - RF CafeAxiom Test Equipment, an electronic test equipment rental and sales company, has published a new blog post that aims at informing people about the importance of carbon neutrality and about the different test equipment that support it with the help of regenerative energy. It suggests a thinking-out-of-the-box approach regarding how "test applications can strive for low carbon footprints by characterizing the quality of a device under test (DUT) that supports carbon neutrality, such as regenerative energy in an EV's charging system. Efficient use of energy is possible by feeding power generated by a DUT during the measurements back to the power grid, rather than dissipating the energy as heat lost to the environment." On a single DUT (Device Under Test) basis that might seem insignificant, but when hundreds of millions of vehicles are being tested of time, the energy saved can be enormous...

Many Thanks to Exodus Advanced Communications for Their Support

Exodus Advanced Communications - RF CafeExodus Advanced Communications is a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide. Power amplifiers ranging from 10 kHz to 51 GHz with various output power levels and noise figure ranges, we fully support custom designs and manufacturing requirements for both small and large volume levels. decades of combined experience in the RF field for numerous applications including military jamming, communications, radar, EMI/EMC and various commercial projects with all designing and manufacturing of our HPA, MPA, and LNA products in-house.

Tuesday the 4th

The RCA Antennalyzer

The RCA Antennalyzer, May 1946, Radio-Craft - RF CafeIt is little wonder that advancements in technology, mathematics, finance, medicine, chemistry, and other disciplines requiring massive numerical computation began accelerating at a rapid pace following the invention of computers. The mechanical computers of Blaise Pascal and Charles Babbage were some of the earliest attempts to make laborious, repetitious calculations faster and less error prone, and they quickly led to many other types of general- and special-purpose machines that by the mid-twentieth century were calculating ballistic flight paths, astronomical positions, electrical circuit functions, probabilities, and other quantities. Programmable electronics computers like the ENIAC greatly enhanced the ability to apply mathematics to just about any problem. However, even by the early Apollo era the government and private institutions employed teams of human calculators to crank out large volumes of tabular data...

Chinese Long March to Reenter Atmosphere Uncontrolled

Chinese Long March to Reenter Atmosphere Uncontrolled - RF Cafe"China launched the first module for its space station into orbit late Wednesday, but the mission launcher also reached orbit and is slowly and unpredictably heading back to Earth. The Long March 5B, a variant of China's largest rocket, successfully launched the 22.5-metric-ton Tianhe module from Wenchang Thursday local time... Designed specifically to launch space station modules into low Earth orbit, the Long March 5B uniquely uses a core stage and four side boosters to place its payload directly into low Earth orbit... this core stage is now also in orbit and is likely to make an uncontrolled reentry over the next days or week as growing interaction with the atmosphere drags it to Earth. If so, it will be one of the largest instances of uncontrolled reentry of a spacecraft and could potentially land on an inhabited area..."

Thanks Once Again for Windfreak's Continued Support!

Windfreak TechnologiesWindfreak Technologies designs, manufactures, tests and sells high value USB powered and controlled radio frequency products such as RF signal generators, RF synthesizers, RF power detectors, mixers, up / downconverters. Since the conception of WFT, we have introduced products that have been purchased by a wide range of customers, from hobbyists to education facilities to government agencies. Worldwide customers include Europe, Australia, and Asia. Please contact Windfreak today to learn how they might help you with your current project.

Radios Serviced by Observation

Radios Serviced by Observation, September 1945, Radio-Craft - RF CafeAnyone who has done a lot of electronics troubleshooting - especially on a wide variety of hardware - knows that proficiency depends on acquiring a 'feel' for how things ought to be. An oft-given example is that bank tellers and store clerks are taught to spot counterfeit bills not by showing them what all the different phony currency looks like, but what real money looks like. That way, anything that does not look familiar is readily apparent. The same philosophy has served technicians and engineers well since the beginning of electrical and electronic circuits. The more senses that can be drawn upon to facilitate troubleshooting, the more quickly you are likely to pinpoint the problem. Depending on the symptoms of the failure, sniffing the assembly for toasted or cracked components and looking for discolored areas is a good first step for catastrophic scenarios. Broken wires and failed solder joints are very common causes, as are partially plugged-in or contaminated...

Triad RF's Amps Power BCT Nano-Sat Radios

Triad RF's Amps Power BCT Radios Soon to Be Released via Nano-Sat from International Space Station - RF CafeTriad RF Systems, a leading designer and manufacturer of innovative RF/Microwave amplifiers and integrated radio systems for challenging environments, is proud to announce that in partnership with Blue Canyon Technologies (BCT), now a wholly owned subsidiary of Raytheon, a Triad RF amplifier is providing high RF power in the transmitter of a BCT nano-satellite. The units are presently stored in the Northrop Grumman Cygnus spacecraft which docked with the International Space Station (ISS) in February of this year. The spacecraft is part of the NG-15 commercial resupply mission and will remain attached to the ISS until May. The BCT nano-satellite powered by the Triad RF amplifier will be released from Cygnus on the return trip. Once launched, it will be enabling the ultra-long range data communication link needed to continuously monitor the spacecraft from earth...

The Radio We Could Send to Heck

The Radio We Could Send to Heck - RF Cafe"There were few bright spots in the pandemic summer of 2020. One of the most dazzling was the flight of U.S. astronauts to the International Space Station and their safe return to Earth aboard a commercial spacecraft from SpaceX. This demonstration was significant for many reasons, one of which was that it suggested a future in which NASA, freed from the demands of getting people to low Earth orbit, could aim much farther. Perhaps as far as Venus. Excitement over a possible mission to Venus was stoked by the (now somewhat disputed) discovery of phosphine gas - a possible sign of microbial life - in that planet's atmosphere. But the second planet from the sun has such an extreme environment that the longest-lasting lander, the Soviet Venera 13, was able to send data for only 2 hours and 7 minutes. The average surface temperature on Venus is 464 °C..."

Many Thanks to Withwave for Continued Support!

Withwave RF & Microwave Components - RF CafeWithwave manufactures an extensive line of metrology quality coaxial test cable assemblies, connectors (wave-, end-, vertical-launch, board edge, panel mount), calibration kits (SOLT), a fully automated 4-port vector network analyzer (VNA) calibrator, between- and in-series connector adaptors, attenuators, terminations, DC blocks, torque wrenches, test probes & probe positioner. Special test fixtures for calibration and multicoax cable assemblies. Frequency ranges from DC through 110 GHz. Please contact Withwave today to see how they can help your project succeed.

Monday the 3rd

Sperry Gyroscope Company

Sperry Gyroscope Company, April 1946, Radio-Craft - RF CafeAt the end of World War II, much of the basic technology developed under the cover of secrecy was made available to the public for the purpose of stimulating research and development for commercial purposes. As with selling surplus material to the American public at significant discounts, the plan was to reward citizens for a five-year-long sacrifice in the effort to beat back the advances of Communism, Socialism, Marxism, and the other oppressive forms of "isms" around the world. History shows that the effort resulted in a major post-war era of prosperity and a general feeling of well-being by the country. This Sperry Gyroscope Company advertisement appeared in a 1946 issue of Radio-Craft magazine, promoting its development of gyroscopically stabilized marine radar. Other magazines of the era and into the 1970s...

New for 2021! RF & Electronics Stencils for Visio

RF & Electronics stencils for Visio r4 - RF CafeWith more than 1000 custom-built stencils, this has got to be the most comprehensive set of Visio Stencils 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). Stencils 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...

Radar Safety Warning: "Don't Cross the Streams"

Radar Safety Warning: "Don't Cross the Streams" - RF CafeHere is an interesting article on the EE Times website entitled, "Radar Safety Warning: 'Don't Cross the Streams'." In it, author Junko Yoshida tells a tale of potential problems that can emerge when a highway filled with radar-equipped vehicles need to content with each other's broadcasts. He begins, "The little-noted issue of radar safety is emerging as a potential Achilles heel of driver-assist and highly automated vehicles: radar signals interfere with each other. Radar has become an essential sensing modality complementing CMOS imaging cameras. Radar works in all weather conditions and enables a range of automated driving features, including automatic emergency Brakes (AEB). But radars can be foiled or faulty if they end up, like Ghostbusters' particle accelerators, crossing each other's streams..."

Bionics a Weird World

Bionics a Weird World, October 1962 Popular Electronics - RF CafeHere is an interesting article that appeared in a 1962 issue of Popular Electronics magazine discussing some of the early electronic system developments that were based on sensory elements found in nature. I'm a bit surprised and disappointed that the author made the mistake of equating a bat's sound-based detection and navigation system to radar rather than sonar. Yes, the principles of operation are the same regarding transmitting a signal and then computing the distance based on the round-trip time of the reflected signal, but there is a fundamental difference between radar which uses radio (the 'ra' part of radar) signals and sonar which uses the sound (the 'so' part of sonar) signals. I would bet that if I had the following December or January edition of the magazine, I would find a letter to the editor...

Mathematical Puzzles, 1981 Old Farmer's Almanac

Mathematical Puzzles, 1981 Old Farmer's Almanac - RF CafeEach autumn I used to anxiously await the appearance of the newest edition of The Old Farmer's Almanac on the store shelf, and such was the case with this 1981 issue. It is not that I was/am an avid farmer, just that I enjoy reading the anecdotes, tales, and interesting historical tidbits included amongst the pages along with tables of high and low tides, moon and sun rising and setting times, astronomical events, and weather patterns expected for the year that lay ahead. Most of all, I liked working the puzzles and riddles. Over the years the difficulty levels gradually got lower and lower (aka dumbed down), to the point where for the last decade or so I have not even bothered buying the OFA. Now it is full of numbnut stuff...

Thanks to PCBONLINE for Their Support!

PCBONLINE - RF CafePCBONLINE supplies complex rigid and flex-rigid printed circuit boards (PCBs),and one-stop production with maximum flexibility ranging from prototype sample to mass production. Rigid-flex, HDI, multilayer, IC-loadboard, LCP 5G optical module, ceramic, MCPCB. Materials include Rogers, Taconic, Arlon, Isola, Bergquist, Kapton, Panasonic, and more. After more than 15 years of continuous efforts, PCBONLINE constantly updates our equipment, improves our technology, and serves you with the highest quality. Cost and delivery quotations online without the need for multiple phone call and/or e-mails.

Sunday the 2nd

Wireless Theme Crossword Puzzle for May 2nd

Wireless Theme Crossword Puzzle for May 2nd, 2021 - RF CafeThis Wireless Theme Crossword Puzzle for May 2nd has many words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. 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., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

 
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 Electronics-Themed Comics June 1951 Radio-Electronics  

Engineering Job Opening

Promote Your Company on RF Cafe

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.

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...

New for 2021! RF & Electronics Symbols for Office™

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!

New for 2020! 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...

New for 2021! RF & Electronics Stencils for Visio

RF & Electronics stencils for Visio r4 - RF CafeWith more than 1000 custom-built stencils, this has got to be the most comprehensive set of Visio Stencils 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). Stencils 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...

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Broadest Frequency Range Detected with Quantum Receiver

Broadest Frequency Range Detected with Quantum Receiver - RF Cafe"A new quantum sensor can analyze the full spectrum of radio-frequency and real-world signals, unleashing new potential for soldier communications, spectrum awareness, and electronic warfare. Army researchers built the quantum sensor, which can sample the radio-frequency spectrum - from zero frequency up to 20 GHz - and detect AM and FM radio, Bluetooth, Wi-Fi, and other communication signals. HOW IT WORKS The Rydberg sensor uses laser beams to create highly excited Rydberg atoms directly above a microwave circuit to boost and home in on the portion of the spectrum being measured. The Rydberg atoms are sensitive to the circuit's voltage, enabling..."

Electronics Printed on Paper Fully Recyclable

Electronics Printed on Paper Fully Recyclable - RF Cafe"Long-lasting devices written with carbon nanomaterial inks can be remade into new ones when their work is done. With a cocktail of carbon-based inks, engineers have made the first fully printable and recyclable electronic circuits on paper. The sturdy, high-performance devices last for months, and can be decomposed at the end to recover the carbon materials so they can be reused for printing. The recyclable carbon electronics are not meant to supplant silicon, says Aaron Franklin, an electrical and computer engineering professor at Duke University who reported the advance in Nature Electronics. Instead, this is a way to satisfy the thirst for ubiquitous, embedded electronics without sending enormous amounts of often toxic waste..."

Shielding Aerospace Systems from EMI

Shielding Aerospace Systems from EMI - RF Cafe"For decades, electromagnetic interference (EMI) shielding has been a consideration and concern to the aerospace and defense industries. But, with the airwaves becoming ever more crowded as devices get smarter and more prolific, EMI has also become a greater consideration for everyone from consumer products manufacturers to the burgeoning U.S. Space Force. Ensuring that on-demand signals are not interfered with or corrupted has made the need for materials that shield EMI more important than ever. EMI, which is caused by one electronic device sending radio frequency or electromagnetic waves intentionally or unintentionally to another device, can disrupt electronic devices, equipment, and systems used in critical medical, military, aerospace, mass transit, vehicular control..."

Vertical Axis Wind Turbines Stand up to Scrutiny

Vertical Axis Wind Turbines Stand up to Scrutiny - RF CafeI have to admit to not being aware of these - "Based on over 11,500 hours of computer simulation, the research from Oxford Brookes University found that Vertical Axis Wind Turbines (VAWTs) boost each other's performance when clustered together, with grouped pairs seeing a 15 per cent rise in output. This is in contrast to the more traditional Horizontal Axis Wind Turbines (HAWTs), which produce turbulence that affects the performance of other HAWTs downwind. 'Modern wind farms are one of the most efficient ways to generate green energy, however, they have one major flaw: as the wind approaches the front row of turbines, turbulence will be generated downstream,' said lead author of the study, Joachim Toftegaard Hansen, and engineering graduate at Oxford Brookes..."

Materials Capable of Self-Propulsion

Materials Capable of Self-Propulsion - RF Cafe"Researchers have discovered how to make materials that snap and reset themselves, relying only upon energy flow from their environment. The discovery may prove useful for various industries that want to source movement sustainably. The team uncovered the physics during a mundane experiment that involved watching a gel strip dry. The researchers observed that when the long, elastic gel strip lost internal liquid due to evaporation, the strip moved. Most movements were slow but every so often, they sped up. These faster movements were snap instabilities that continued to occur as the liquid evaporated further. Additional studies revealed that the shape of the material mattered..."

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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