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

- Welcome to the RF Cafe Website -
"Maybe your purpose on this planet isn't on this planet." -- U.S. Space Command

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

Turning Point in RF GaN Patenting over Last 2 Years

Unlicensed Access to 6 GHz Band to Add $163B to Brazilian Economy

ARRL Asks FCC to Allow 3.4-GHz Operation Until Spectrum is Occupied

• Government Crack-Down on Tech Giants

• Business Models for 5G Edge Look Scary for Operators

Foxconn to Shift Some Apple Production to Vietnam

•  U.S. Department of Defense Unveils Electromagnetic Spectrum Strategy

Universal Radio Announces Closing After 78 Years

UK Defence Secures Largest Investment Since the Cold War

CRFS RF Spectrum Winter Seminars

CRFS RF Spectrum Winter Seminars - RF Cafe"CRFS has launched a new Winter Webinar Series aimed at maintaining discussions on key RF Spectrum topics. Since the international lockdown began during March, and with the cancellation of sector events, CRFS has provided a virtual stage to educate and support audiences in the security, defense and spectrum monitoring community. Adapting to the 'new normal' has seen diverse audiences from across the globe attend the previous webinars and the CRFS Winter Webinar series will expand on this with a range of new topics. The webinars will explore the growing importance of Electromagnetic Spectrum Operations (EMSO) in military Electromagnetic Battle Management (EMBM), the challenges faced..."

Quantum X-Ray Microscope in Development

Quantum X-Ray Microscope in Development - RF Cafe"Scientists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory have begun building a quantum-enhanced X-ray microscope at the National Synchrotron Light Source II (NSLS-II). This groundbreaking microscope, supported by the Biological and Environmental Research program at DOE's Office of Science, will enable researchers to image biomolecules like never before. NSLS-II is a DOE Office of Science User Facility where researchers use powerful X-rays to 'see' the structural, chemical, and electronic makeup of materials down to the atomic scale. The facility's ultrabright light already enables discoveries in biology, helping researchers uncover the structures of proteins to inform drug design for a variety of diseases - to name just one example..."

Countermeasures for Aerial Drones

Countermeasures for Aerial Drones (Artech House) - RF CafeArtech House today announced the publication of Countermeasures for Aerial Drones by Garik Markarian and Andrew Staniforth. This comprehensive resource explains the development of UAVs, drone threats, counter-UAV systems, and strategies to handle UAVs, focusing on the practical aspects of counter-unmanned aerial vehicle (UAV) systems and technologies. Theory, technical and operational practice with insights from industry and policing are covered, and the full rogue drone threat landscape and counter-drone technologies and systems is explored. The book provides insight into counter-drone strategy, developing effective counter-drone strategies and measures, as well as counter-drone programs and the regulatory frameworks governing the use of drones. An New Release price of $111 is being offered for a limited time...

Thanks for NorthEast RF's Continued Support!

NorthEast RF - RF CafeNorthEast RF's comprehensive antenna testing services include linear | circular polarized antenna measurements and OTA cellular device pre-compliance. Up to 18" diameter and <10 kg weight. Antennas can be rapidly evaluated and optimized using our fast near field spherical system. Test results supplied in data file with pattern viewer software. A picture of the test configuration is included to help aligned axis. Our selection of human head and hand phantoms are ideal for verification of body worn devices. Turnaround time is usually 3-days.

The Walkie-Talkie

The Walkie-Talkie, March 1955 Popular Electronics - RF CafeJust as early cellphones (Motorola's Bag Phone, e.g.) required large carrying cases to contain both the large electronics and the large battery required to operate the phone, some of the first commercially available portable personal radio sets came with shoulder straps. Those that didn't have straps had wheels and a handle. The "walkie-talkie" (originally called "handi-talkies") designs were first seen during World War II and then in Korea. In fact, this 1955 article from Popular Electronics was printed shortly after the end of the conflict in 1953. Don't confuse the radio-based portable field telephones with the ones that had a pair of wires (sometimes thousands of feet of it) that did not need complicated circuitry for over-the-air transmitting and receiving...

Many Thanks to ConductRF for Continued 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! 

Radio & Radar Crossword Puzzle for November 29th

Radio & Radar Crossword Puzzle for November 29, 2020 - RF CafeFor the sake of avid cruciverbalists amongst us, each week I create a new crossword puzzle that has a theme related to engineering, mathematics, chemistry, physics, and other technical words. This November 29th Radio & Radar Crossword Puzzle, as always, 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., Hedy Lamarr or the Bikini Atoll). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

National Union "Presentation" Radio Model G-619

Radio Data Sheet 344 National Union "Presentation" Radio Model G-619, February 1947 Radio-Craft - RF CafeNational Union Radio Corporation, located in Orange, New Jersey, had been producing radios since its formation in 1929 when this Radio Service Data Sheet for its Model G−619 "Presentation" tabletop set appeared in a 1947 issue of Radio-Craft magazine. That they survived the Great Depression which began in the year of their founding is a testament the tenacity of its management, design staff, and production workers. This 5-tube radio had a very nice mahogany case with a unique reverse-lettering dial glass plate. A few years ago I posted an advertisement by Union Radio from a 1945 issue of Radio-Craft appealing specifically to women engineers and technicians because of the severe shortage of men available while serving in the armed forces during World War II...

Army Advances Materials for New Low-Profile Antenna

Army Advances Materials for New Low-Profile Antenna - RF Cafe"Army scientists have developed a first-of-its-kind antenna that could change how ground vehicles and airborne systems communicate, transmit, and receive radio frequency communications. The Army matured a manufacturing process using a special class of engineered materials known as metaferrites to make an ultra-thin wideband antenna. The antenna conforms to curved surfaces, making it ideal to integrate in unmanned aircraft systems, rotary wing aircraft, and ground vehicles. Said Dr. Philip Perconti, Deputy Assistant Secretary of the Army for Research and Technology and Chief Scientist for the Army, 'Our technical experts used their knowledge in material properties, modeling, and test and evaluation to further advance these materials..."

Computers Yesterday and Today

Computers Yesterday and Today, February 1960 Popular Electronics - RF Cafe60 years ago, when this article was originally published in Popular Electronics magazine, most computers were constructed either of gears or of vacuum tubes. The Univac in the photo below was a breakthrough for having been built entirely of transistors. Even with its "compact" size compared to is successor the ENIAC, the total computational power and programmability was orders of magnitude less than that of my handheld calculator, whose size is largely dictated not by the volume of the electronic circuits, but by the size of the display and the need for input keys larges enough to press reliably. Doesn't the photo of Pascal's calculator of 1642 look like it could be a modern 19" rack-mount chassis, complete with handles?

Modelithics Releases the COMPLETE+3D Library™ v20.8 for Ansys® HFSS™

Modelithics® Releases the COMPLETE+3D Library™ v20.8 for Ansys® HFSS™ - RF CafeModelithics, is pleased to announce the release of version 20.8 of the COMPLETE+3D Library for use with Ansys HFSS. The library contains over 325 highly scalable Microwave Global Models™ for capacitor, inductor, and resistor families from many popular vendors, plus a collection of nearly 300 Modelithics' 3D geometry models for inductors, capacitors, filters, packages and connectors. This library now represents a total of 22,000 individual components with circuit and/or 3D EM models. Version 20.8 adds nine new part value-, pad-, and substrate scalable models and over eighty new full wave 3D electromagnetic models. New scalable circuit models include new models for AVX's MP01...

Please Thank Centric RF for Their Long-Time Support!

Centric RF microwave components - RF CafeCentric RF is a company offering from stock various RF and Microwave coaxial components, including attenuators, adapters, cable assemblies, terminations, power dividers, and more. We believe in offering high performance parts from stock at a reasonable cost. Frequency ranges of 0-110 GHz at power levels from 0.5-500 watts are available off the shelf. Order today, ship today! Centric RF is currently looking for vendors to partner with them. Please visit Centric RF today.

New Antenna to Multiply Field

New Antenna to Multiply Field, January 1938 Radio-Craft - RF CafeAmateur radio enthusiasts are very familiar with burying ground radials below the surface (or sometimes just laid on top) in order to increase antenna efficiency by affecting impedance and, more importantly, the radiation pattern. Long distance (DX) operators generally prefer low launch angles over high angle "cloud warmers." Pittsburgh's KDKA, the country's first commercial broadcast radio station, built what would have been the mother of all ground radial arrays for its time - 360 (one every degree), 700-foot copper wires (8 AWG), for a total of a quarter million feet! It was laid using a farm tractor drawing a non-motorized trench cutter that looks like it came straight from the John Deere factory. It also implemented a new type of passive vertical suppressor element array...

RF Filter Market to Grow Steadily to $15B by 2024

RF Filter Market to Grow Steadily to $15B by 2024 - RF Cafe"According to a recent report published by Technavio, the RF Filters Market is poised to grow at a CAGR of over 20% from 2020 to 2024 to reach USD $15.73B. The report offers an up-to-date analysis regarding the current market scenario, the latest trends and drivers, and the overall market environment. According to the report, the market is fragmented, and the degree of fragmentation will remain the same during the forecast period. The increase in product launches, organizational restructuring, M&A, and partnerships help market participants expand their product portfolios, geographic presence, and distribution networks. Skyworks Solutions Inc., STMicroelectronics NV, Tai-Saw Technology Co. Ltd., Taiyo Yuden Co. Ltd., and TDK Corp. are some of the major market participants..."

Thanksgiving Day Crossword Puzzle

Thanksgiving Day Crossword Puzzle for November 26, 2020 - RF CafeHere is a specially-made Thanksgiving Day 2020 crossword puzzle compliments of RF Cafe containing a few specific words commemorating the holiday along with the usual assortment of engineering and science related words and clues. Thanksgiving is celebrated in America each year on the fourth Thursday of November in commemoration of the 1621 feast where the Plymouth colonists and Wampanoag Indians shared a harvest feast. Macy's 91st Thanksgiving Day Parade occurs on the morning of Friday, November 26th and follows a route along Central Park West and 6th Avenue. Interestingly, the parade was cancelled during the World War II years of 1942, 1943, and 1944 in order to conserve much needed raw materials. This year, 2020, it will be a hollow event with no spectators allowed along the parade path...

Many Thanks to MECA Electronics for Their Long-Time Support!

MECA ElectronicsSince 1961, MECA Electronics has designed and manufactured an extensive line of RF & microwave components for in-building, satellite, radar, radio, telemetry, mobile radio, aviation & ATC. Attenuators, directional & hybrid couplers, isolators & circulators, power dividers & combiners, loads, DC blocks, bias-Ts and adapters & cables. MECA has long been the 'backbone' of high performance wired and air-interfaced networks such as in-building applications, satellite communications, radar, radio communications, telemetry applications, mobile radio, aviation & air traffic communications. 

Mac's Radio Service Shop: A Sound Conversion

Mac's Radio Service Shop: A Sound Conversion, November 1951 Radio & Television News - RF CafeListen to the RF Cafe Podcast! A November edition of "Mac's Radio Service Shop" is appropriate given today's date, especially since author John T. Frye nearly always had the story's setting coincide with the month in which it appeared in Radio & Television News magazine; the year was 1951. The unspecified dateline is somewhere in the upper Midwest, most likely Indiana. Mac's mention of converting a black-and-white television set to color by installing a "color wheel" really betrays the era. The NTSC (National Television System Committee) had not yet adopted an industry standard for color TV, and the various manufacturers were selling a mix of mechanical, electro-mechanical and all-electronic sets. In 1953, the NTSC settled on a 525-line interlaced scan (only 468 lines are part of the visible scan). Knowing that a better color system would be available soon due to massive public demand, Mac put his efforts into talking customers out of a color conversion...

Triad RF Systems' Stephen Barthelmes Interview by everythingRF

Triad RF Systems' Stephen Barthelmes Interview by everythingRF - RF CafeStephen Barthelmes of Triad RF Systems talks amplified radios, Doherty techniques, SDR, and UAVs with everythingRF. We talk about everything from amplified radios and Doherty techniques to software defined radio (SDR) systems and UAVs in an interview with everythingRF this week. everythingRF: Can you give us a brief history about Triad RF? Stephen Barthelmes: Triad RF was established in 2010 when the idea for the company began. In 2013, Dave, Dean and I got together to begin the development of RF products that were underserved by the market. By bringing the decades of knowledge that we had accumulated together, we implemented solid processes in sales, design and manufacturing that produced products that were cutting edge in performance and cost. We also understood the market pressures for increasing RF power to enhance data transmission while simultaneously improving overall efficiency. We stepped up to that challenge by creating some of the most linear and efficient amplifiers in the market...

Anatech Electronics (RF Filters) - RF Cafe MPDevice microwave devices - RF Cafe
Res-Net Microwave - RF Cafe Res-Net Microwave - 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