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Homepage Archive - June 2020 (page 4)

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 June 2020 homepage archives.
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Wednesday 1

Fractal Cloaking Antennas

Fractal Cloaking Antennas - RF CafeFractals have been a mathematical curiosity since first being popularized by Benoit Mandelbrot (who coined the term) in the 1960s. Perhaps, and in retrospect no coincidence, was the popularity of the cloaking concept featured in the 1960s phenomenon called Star Trek. I say coincidence because who would have guessed that some of the leading research in invisibility cloaking would involve barriers derived from fractal forms? Have aliens been guiding the technology? If so, maybe they're working at Fractal Antenna Systems, because in mid December the company issued a press release detailing work being done on a cloaking system that works in the microwave band (as opposed to visible light) - chosen for convenience...

RF Superstore: Supplier of RF & Microwave Components

RF Superstore coaxial cable, connectors, adapters - RF CafeRF Superstore launched in 2017, marking the return of Murray Pasternack, founder of Pasternack Enterprises, to the RF and microwave Industry. Pasternack fundamentally changed the way RF components were sold. Partner Jason Wright manages day-to-day operations, while working closely with Mr. Pasternack to develop RF Superstore into a world class RF and microwave component supplier. RF coaxial connectors & adapters, coaxial cable & cable assemblies, surge protectors, attenuators. Items added daily. Free shipping on orders over $25. We're leading the way again!

Tuesday 30

Licensing Problems and the Serviceman

Licensing Problems and The Serviceman, November 1945 Radio-Craft - RF CafeLicensing of electronic equipment servicemen was extensively debated among state regulatory boards from the end of World War II through the time that transistorized circuits began replacing high voltage vacuum tubes in televisions, radios, and appliances in homes and businesses. Of course high voltage the CRTs still dominated televisions for a few more decades, but other than with a few states like Wisconsin, adoption of licensing requirements never happened. Specifically, "Electronic equipment is any device or devices which are directly or indirectly connected with or containing a vacuum tube having two or more internal elements for the purpose of effecting amplification or rectification, visual indicators, cathode ray tubes or in any way modifying or changing an electrical current in any manner or changing electrical energy to another form of energy, including aerials and other devices used in connection therewith." Proponents argued that safety to both the serviceman...

Northrop Grumman, Boeing Build C-Band Satellites to Clear 5G Spectrum

Northrop Grumman, Boeing Build C-Band Satellites to Clear Spectrum for 5G - RF Cafe"SES, leader in global content connectivity solutions, announced its selection of two U.S. satellite manufacturers, Northrop Grumman and the Boeing Company, to deliver four new satellites as part of the company's accelerated C-band clearing plan to meet the Federal Communication Commission's objectives to roll-out 5G services. Northrop Grumman will deliver two flight-proven GeoStar-3 satellites, each equipped with a high-quality C-band payload to deliver the superior customer experience that end users are accustomed to. The two satellites - SES-18 and SES-19 - will be designed, assembled and tested in Dulles, Virginia. The Boeing Company will deliver a pair of highly efficient all-electric 702SP satellites. The two satellites - SES-20 and SES-21 - will be manufactured and assembled in Los Angeles, California..."

Many Thanks to MPDevice for Continuing Support!

MPDevice - RF CafeMPDevice (MPD) has become a trustworthy and reliable company in the global RF market as a manufacturer of passive RF Devices. Included are attenuators and terminations, coaxial connectors, adapters, and cable assemblies, DC blocks, surge arrestors, power combiner / dividers, and directional couplers. The Korean Telecommunication market is now entering into the era of hyperconnected society. With continuous enhancement in R&D capabilities and quality control, MPD will continue in an effort to become the No. 1 technologically innovative company with a focus on the emerging 5G marketplace.

Should Servicemen Be Licensed?

Should Servicemen Be Licensed?, December 1947 Radio-Craft - RF CafeShould Servicemen Be Licensed?, December 1947 Radio-Craft - RF CafeHugo Gernsback (nee Gernsbacher), born in Luxembourg, made his fame and fortune in America as a serial electronics magazine publisher, science fiction author, inventor, and visionary. Radio Craft magazine, in which this editorial was printed, began in 1929 on the heels of Radio News, which began in 1919 and ran through 1959. Hugo Gernsback had a huge influence on the direction of communications electronics, and his opinions were widely sought. As has been the case since governments first regulated services and manufacturing, there was in the middle of the last century a debate over whether electronics servicemen should be required to be licensed to ply their trade. Magazines of the era were filled with full-page advertisements offering home-study courses and classroom instruction to prepare for prestigious and prosperous careers in servicing of radio and television receivers...

The Value of Testing with Mismatch Terminations

The Value of Testing with Mismatch Terminations - RF CafeA common cause for systems not performing as simulations predict is neglecting to account for an imperfect impedance match between components in the chain. Murray Slovick, of JFW Industries, has an article in Microwave Product Digest (MPD) entitled, "The Value of Testing with Mismatch Terminations," which addresses the issue. "Mismatch loads can be used to test amplifiers and help characterize their performance under conditions that might occur in the field. To do so, a mismatch load (or mismatch termination) is used to present a specified VSWR, rather than the usual 1:1 perfect 50 ohm load. There are many situations in which it becomes necessary to match the impedance of a load to that of the source so as to maximize power transfer. Having a mismatch between a source (an amplifier) and a load reduces the delivered power and efficiency of the system; when a transmission line is terminated with impedance that is not equal..."

Modelithics Welcomes Silicon Supplies as Strategic MVP 

Modelithics Welcomes Silicon Supplies as Strategic MVP - RF Cafe Modelithics, the leading RF and microwave simulation model provider, welcomes Silicon Supplies, a solution based provider of Silicon Discrete and IC (Integrated Circuit) bare die for use in niche trailing edge and leading edge applications, into the Modelithics Vendor Partner (MVP) Program at the Strategic level. As a Strategic MVP, Silicon Supplies is supporting RF and microwave designers by sponsoring free extended 30-day trials (with approval) of all Modelithics models available for Silicon Supplies components, as well as collaborating with Modelithics to develop new design data and models for selected components. In addition, to becoming a Strategic MVP, Silicon Supplies and Modelithics have collaborated to develop a new nonlinear model for Silicon Supplies' 2SC3356 NPN RF Bipolar Transistor...

Reactel: RF & Microwave Filters of All Types

Reactel Filters - RF Cafe

Reactel has become one of the industry leaders in the design and manufacture of RF and microwave filters, diplexers, and sub-assemblies. They offer the generally known tubular, LC, cavity, and waveguide designs, as well as state of the art high performance suspended substrate models. Through a continuous process of research and development, they have established a full line of filters of filters of all types - lowpass, highpass, bandpass, bandstop, diplexer, and more. Established in 1979. Please contact Reactel today to see how they might help your project.

Monday 29

Mac's Radio Service Shop: Portable Patter

Mac's Radio Service Shop: Portable Patter, April 1950 Radio & Televsion News - RF CafeCan you imagine a time when you could have your radio, or any electronic device for that matter, diagnosed for proper operation for only a dollar? That would include not just turning it on and making certain that it appears to work, but actually doing a cursory check-out of component function, current draw, tuning, etc. Yes, the good deed could potentially earn you some customers willing to pay to have repairs and/or preventative maintenance done, but that's a lot of up-front financial risk. Mac McGregor, a proven shrewd and honest businessman, evidently thought so when he ran the "special" at his establishment. Author John Frye nearly always made his "Mac's Radio Service Shop" techno-dramas about then-current issues and often for-real equipment. His young and mostly-able assistant Barney often served as the vicarious substitute apprentice for us, his audience...

High-Energy Laser Weapon Systems

High-Energy Laser Weapon Systems - RF Cafe"Longtime skeptics of high-energy lasers often say, 'the technology is five years out… and will always be.' The DoD and defense industry have invested in laser weapons development for 40 years, in anticipation of a transition to troops that has yet to happen. Then, between 2017 and 2018, we demonstrated our high-energy laser weapon system, or HELWS, for the U.S. Air Force and the Army, shooting down multiple drones. The demonstration marked a milestone in the development of functional laser weapon systems and resulted in a contract with the Air Force to develop three prototype high-energy laser systems that will be deployed to troops overseas..."

CHIPS for America

CHIPS for America - RF CafeThis, I am glad to see. Let's bring the manufacturing back home. "The CHIPS for America Act proposes to revive domestic chip-making, fund R&D, and secure technology supply chains. CHIPS stands for 'Creating Helpful Incentives to Produce Semiconductors.' The Act proposes $12B to fund existing Pentagon semiconductor support programs, plus $5B to other federal agencies for IC R&D. $5Billion is intended to fund an IC packaging and assembly institute. $500M is to go to support a 'domestic advanced microelectronics packaging ecosystem.' Incentives for investing in domestic IC manufacturing, include a 40% investment tax credit good through 2024. The credit would be phased out in 2027..."

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.

Made in the USA - Wuhan Flu Face Masks!

eBay Face Masks Made inthe USA - RF CafeI find myself conflicted when contemplating the situation I discovered. While looking on eBay for a vintage Morse code straight key, on a whim I decided to try just the phrase "Made in the USA" to see what kinds of products would be returned. To my shock, the entire page was filled with nothing but cloth face masks! Who would have guessed that a virus coming from Wuhan China would spark the first big wave of domestically made products - to protect us from the virus! Well, there is another product type suddenly being manufactured in large quantities in the USA - ventilators, to treat critically sick patients with the Wuhan Flu (aka COVID−19). As our economy and national spirit suffers profoundly, do most people even remember where this all started and how it got here? I'm guessing not, because the news media does not mention it.

Rules of the Road for RF and Microwave Filters

Rules of the Road for RF and Microwave Filters - RF CafeL-com has a useful article posted on the Microwave Product Digest (MPD) website entitled, "Rules of the Road for RF and Microwave Filters." No particular author is credited, so it is likely a re-published company app note. The piece begins: "Interference has been the bane of wireless communications since the earliest days of radio, and scientists and engineers of every era no doubt found their challenges to be the worst. Then, as now, RF and microwave filters are some of the foremost contributors to keeping interference in check, and most of the attention to filter design is focused on end-user devices that use tiny acoustic-wave filters. However, the need for traditional connectorized filters has not abated because in many applications there is no suitable substitute. So, it seems prudent to review some basic rules about key performance specifications..."

Electro-Photonics Offering RF & Microwave Products

Electro-PhotonicsElectro-Photonics is a global supplier of RF & Microwave components. Their products include SMT hybrid and directional couplers, wire bondable passive components, mounting tabs, filters, transmission lines, and very useful test boards for evaluating components (spiral inductors, single-layer capacitors). The Electro-Photonics team can support your small R&D design requirements with RF & Microwave test fixtures and save you valuable design and characterization time. Please take a moment to visit Electro-Photonics' website and see how your project might benefit.

Sunday 28

Radio & Radar Crossword Puzzle for June 28

Radio & Radar Crossword Puzzle for June 28, 2020 - RF CafeHere is the RF Cafe custom-made technology-themed crossword puzzle for the week of June 28th. Each week for two decades, for the sake of all avid cruciverbalists amongst us, I have created a new technology-themed crossword puzzle using only words from my custom-created lexicon related to engineering, science, mathematics, chemistry, physics, astronomy, etc. You will never find among the words names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort. You might, however, find someone or something in the otherwise excluded list directly related to this puzzle's technology theme...

Friday 26

Antenna Principles Part II

Antenna Principles Part II - Multi-Element, Long-Line and Rhombic Antennas, January 1947 Radio-Craft - RF CafePart II of the "Antenna Principles" series of article in Radio-Craft magazine discusses multi-element, long-line, and rhombic antennas. Without burdening the reader with complicated formulas, the authors introduce many types of antenna structures and rely on sketches and photos, along with graphs showing radiation patterns to explain the strengths and weakness of designs relative to each other. If you are new to antenna construction and operation, these articles are as a good starting place as any other tutorial. Of course the nice thing about these days is if you desire to delve deeper into the subject, the Internet has a plethora of information for learning as much as you care to ingest, and many online calculator exist for assisting in design of your own antenna...

Practical 3D Printing of Antennas and RF Electronics

Practical 3D Printing of Antennas and RF Electronics - RF Cafe"Additive manufacturing can reduce the time and material costs in a design cycle and enable on-demand printing of customized parts. New multi-material 3D printers that can print both metal and dielectric materials enable the additive manufacturing of antennas and RF components. Developments in software are critical to leveraging this capability; good tools allow more effort to go towards creation than implementation. Three devices are described in detail in this article to demonstrate the 3D printing of RF components. First, a Marchand balun is presented, demonstrating rapid prototyping of a complex, multilayer RF circuit. Next, a monopole array is shown with an integrated beam-steering network and radome to show rapid prototyping of a complete antenna system. Finally, a bowtie antenna with rounded corners is presented, showing good performance in the Ku band..."

How to Live Longer

How to Live Longer, June 1953 QST - RF CafeMy career involving controlled movement of electrons began with working around high voltages and currents. In electrical vocational classes, the instructor lectured on the potential (pun intended) harm that could be done to life and property because of ignorance or inattention to the job at hand. Safety practices were reviewed prior to allowing us plebes to handle not just 3-Ø, 480 V supplies for motors, but also for household AC circuits and low voltage sources with high current outputs. We all had the opportunity to get 'lit up' with 115 Vac and even 230 Vac if we dared a practice that would never be allowed in today's environment). We watched films (no VCRs back then) showing poor souls who had been the victims of electrocution. It was all enough to convince me that the experts weren't kidding. Nevertheless, even with a healthy respect for being hurt...

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...

Accurate Models and Discrete Part-Value Optimization Combine to Improve Workflows

Accurate Models and Discrete Part-Value Optimization Combine to Improve Workflows - RF Cafe"A workflow that combines measurement-based models with discrete part-value optimization can aid designers by automatically adjusting a design’s component values to optimal manufacturer part values." So begins an article by Chris DeMartino entitled, "Accurate Models and Discrete Part-Value Optimization Combine to Improve Workflows." Chris was an editor for many years at Microwaves & RF magazine where this appears, and is now at Modelithics. "Designing RF filters and other high-frequency circuits with today's simulation software tools often involves performing some form of optimization to achieve the desired performance. For example, take the case of a lumped-element filter. Optimizing such a filter involves adjusting the values of its lumped..."

Berkeley Nucleonics: Instruments & TE for RF, Optics, & Particle Detection

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 25

Carl & Jerry: Vox Elektronik

Carl & Jerry: Vox Electronik, September 1958 Popular Electronics - RF CafeBy the time this Carl & Jerry episode entitled "Vox Elektronik" was published in 1958, creator and author John T. Frye had written the techno-dramas for Popular Electronics magazine for four years - beginning with the first edition of the publication in October 1954 ("A New Company Is Launched"). In this saga, the teenagers, both of whom already have shared many adventures involving homemade electronic gizmos and Ham radio, experience one of the instances of girl craziness competing for the attention of one or the other. It involves a Charlie McCarthy-style wooden dummy named "Splinter." Used in the story is a dummy-fide joke about onions and the River Kwai, no doubt a reference to the World War II movie "Bridge on the River Kwai*," which had hit the movie theaters about a year earlier...

N-G to Install Leonardo Surface-Search Radar on Navy MQ-8C Unmanned Helicopters

Northrop Grumman to Install Leonardo Surface-Search Radar on Navy MQ-8C Unmanned Helicopters - RF Cafe"The Leonardo Osprey MM AESA multi-mode surveillance radar is for helicopters, fixed-wing aircraft, and unmanned aerial vehicles (UAVs). Military unmanned aerial vehicle (UAV) experts at Northrop Grumman Corp. will upgrade a sophisticated surface-search radar system on as many as eight of the U.S. Navy's MQ-8C Fire Scout shipboard unmanned helicopters. Officials of the Naval Air Systems Command at Patuxent River Naval Air Station, Maryland, announced their intention Monday to award an order to the Northrop Grumman Aeronautics Systems segment in San Diego to provide as many as eight AN/ZPY-8 radar aircraft-kits (A-kits) for MQ-8C UAVs..."

Transistor Trends - Transistor Anniversary

Transistor Trends - Transistor Anniversary, May 1958 Radio-Electronics - RF CafeIf you are reading this, then chances are you owe a part of your livelihood to three gentlemen by the names of Bardeen, Brattain and Shockley. On this day 73 years ago the trio announced their discovery of a gain producing semiconductor device that they dubbed a 'transistor' due to its dual nature as a transconductance amplifier and a variable resistance. This article by magazine editor Hugo Gernsback, in celebrating the 10-year anniversary of the transistor, mentions that somewhere in the neighborhood of 30 million of the little miracle components would be sold that year. The microprocessor in the device you are using to read this contains more than a billion. By comparison, the 'primitive' year-2000-vintage Intel Pentium 4 itself integrated more than the 30,000,000 transistors sold in 1957...

Integrated Simulators Study EM Effects

Integrated Simulators Study EM Effects - RF CafeJack Browne has an interesting piece over on the Microwaves  & RF website entitled, "Integrated Simulators Study EM Effects." He begins: "Electromagnetic simulators are gaining in power and ease of use but also becoming more available integrated into other high-frequency simulation software programs. Computer software simulators come in many varieties, tackling everything from passive circuit elements to full electronic systems. As a form of 'thread' that ties them together, electromagnetic (EM) simulators show the EM fields generated by devices, circuits, and systems. They may do it in planar or two-dimensional (2D) form or in three dimensions (3D), showing EM fields in all three axes. EM simulators are ever-evolving, providing increased insights into electronic designs. As part of this evolution..."

Lemos International Technologies:

Lemos International - RF CafeLemos International Technologies is both a designer and manufacturer of wireless products and a distributor of products from other world-class manufacturers. A modular approach to wireless connectivity helps eliminate much of the technical design and testing and also simplifies or eliminates the need for expensive conformance testing and certification. Ready-to-use Bluetooth, GPS, Wi-Fi, licensed and unlicensed band products are available. Custom design services can help you achieve success with your project's unique needs.

Wednesday 24

Birth of the Audion

Birth of the Audion, January 1947 Radio-Craft - RF CafeRadio-Craft magazine dedicated its January 1947 issue to the fortieth anniversary of Lee de Forest's invention of the Audion tube - the world's first successful controllable electrical signal amplifying device. Many articles are presented that were written by people who knew de Forest personally (including editor Hugo Gernsback) and followed his progress and/or actually worked with de Forest during his experiments. This particular "Birth of the Audion" piece was by Frank E. Butler, who provides "A first-hand account written by an assistant of de Forest throughout the hard years which immediately preceded the most revolutionary invention in all the history of radio." If you have never read an account of the evolution of the Audion, you need to read this. It is akin to the path Thomas Edison took when working to perfect his incandescent light bulb. When you have no prior work to draw upon, success often requires tiresome repetition...

Quantum Satellite Links Extend More Than 1,000 km

Quantum Satellite Links Extend More Than 1,000 km - RF Cafe"A space-based, virtually unhackable quantum Internet may be one step closer to reality due to satellite experiments that linked ground stations more than 1,000 kilometers apart, a new study finds. Quantum physics makes a strange effect known as entanglement possible. Essentially, two or more particles such as photons that get linked or 'entangled' can influence each other simultaneously no matter how far apart they are. Entanglement is an essential factor in the operations of quantum computers, the networks that would connect them, and the most sophisticated kinds of quantum cryptography, a theoretically unhackable means of securing information exchange. The maximum distance over which researchers have thus far generated quantum cryptography links between stations on Earth is roughly 144 kilometers. In principle, satellites..."

Half a Century of Electronics Publishing: Radio-Electronics

Half a Century of Electronics Publishing - 50th Anniversary, April 1958 Radio-Electronics - RF CafeThe iconumerator (electronic particle counter), the vidicon tube (TV image recorder), the Electro Importing Co.'s Telimco (world's first home wireless outfit), the Wireless Association of America (founded before ARRL), the Dynamophone (voice-activated switch), the "Swatties" (members of the Society of Wireless Telegraph Engineers), the "Detectorium" (silicon crystal detector), Ralph 124C 41+ and his sweetheart Alice 212B 423 (Gernsback sci-fi series) were covered. Radio Amateur News predated QST as America's premier magazine for Hams, the famous 1919 "Verboten" cartoon (protested limitations on private radio operators from the wartime era), the de Forest "Oscillion," Major Armstrong's superregenerative circuit, the first "network" broadcast (WEAF in New York City and WNAC in Boston), the Reinartz, the Super, the Autoplex, the Solo dyne, and the Neutrodyn (home radio receiver kits), Tec-Teleducation (audiovisual classrooms)...

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...

LadyBug Technologies: Attenuators, Adapters, Cable Assemblies, Power Dividers

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.

Tuesday 23

Triplett Electrical Instrument Company Ad

Triplett Electrical Instrument Company, July 1954 Radio & Televsion News - RF CafeThe Triplett Electric Instrument Company has been in continuous operation since 1904, although today it goes by the name Triplett Test Equipment & Tools. It was founded in 1904 in Bluffton, Ohio, by Ray L. Triplett. Mr. Triplett is holding his company's first vacuum tube tester, the Readrite Model 201, which debuted in 1921, in this full-page advertisement that appeared in a 1954 issue of Radio & Television News magazine. Triplett claims it is the first commercial tube tester. A pretty extensive search did not turn up any photos of the Model 201 tube tester, but there is a follow-on Model 215 tube tester on Steven Johnson's Readrite & Triplett history webpage. Here, too, is a very informative page outlining Triplett's history, including a picture of the "portable" ammeter built into a pocket watch case. The "new" Model 3423 Mutual Conductance Tube Tester, priced at $199.50 in 1954, is the equivalent of $1,901.50 in today's money...

ConductRF LSA61 High Frequency RF Jumper Cables

ConductRF LSA61 High Frequency RF Jumper Cables - RF CafeConductRF's latest innovation is High-Frequency RF Jumper Cables with 2.92 mm, 2.4 mm or 1.85 mm connectors as standard. This assemblies use our optimized direct solder attached connectors and our superior double shielded hi-frequency A61SW flexible cable with shielding effectiveness greater than -100 dB. These cables are design to support the latest requirements for 5G applications for cross connecting modules, but can equally be used in any field where hi-frequency jumper cables are required. Beyond our standard interconnect, we can also offer solutions with SMP, SMPM, SMA and many other common connector interfaces. Hi-Performance right angled options are available utilizing hard setting shrink tube to form the cable bend...

Long-Range Communications w/o Large, Power-Hungry Antennas

Long-Range Communications w/o Large, Power-Hungry Antennas - RF Cafe"Establishing long-range tactical communications for U.S. troops in remote locations currently requires giant parabolic dishes, tall pole-mounted antennas, large antenna domes, and high-power amplifiers. Besides their significant weight, power, and cost (SWAP-C), these antennas present large visual and radio frequency (RF) signatures, are vulnerable to jamming, and constitute a single point of failure. To break this dependence on big antennas and amplifiers, DARPA recently announced the Resilient Networked Distributed Mosaic Communications (RN DMC) program. RN DMC aims to provide long-range communications through 'mosaic' antennas composed of spatially distributed low SWaP-C transceiver elements or 'tiles.' This approach replaces high-powered amplifiers and large directional antennas with mosaics of dispersed tile transceivers. Transmit power is distributed among the tiles, and gain is achieved through signal processing rather than by a physical antenna..."

Thanks Once Again to everythingRF for Long-Time Support!

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 267,269 products from more than 1397 companies across 314 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.

Ultra-Flat Aluminum Electrolytic Capacitors

Ultra-Flat Aluminum Electrolytic Capacitors - RF CafeAn ad for Cornell Dubilier's new Ultra-Flat Aluminum Electrolytic Capacitors  that appeared in Aerospace & Defense magazine caught my attention. Electrical energy density is a big topic these days with the need to cram extremely large amounts of charge storage into extremely small spaces. The future of electric-powered cars, airplanes, boats, motorcycles, portable tools and appliances, radios, phones, lights, computers, etc., depends on high density energy storage. Supercapacitors are being used in many applications in place of batteries, especially where cost, space, and an ability to be recycled (charged / discharged) thousands of times without loss of performance. Specs: 2 or 3 mm profile, high energy density of 0.4 J/cc, replaces banks of solid tantalum chips, 3000 hr life @85ºC without voltage derating...

Revolutionary New Oscillator-Amplifier

Revolutionary New Oscillator-Amplifier, June 1955 Radio Electronics - RF Cafe   When I read about Du Mont's Iconumerator, the first thing that came to mind was the video of the Rockwell Retro Encabulator and General Electric's Turboencabulator. As it turns out, the Du Mont device is real. This article from a 1955 issue of Radio Electronics discusses a new type of oscillator-amplifier that works on the principle of microwave amplification by stimulated emission of radiation (maser). It used ammonia as a masing medium. Masers were quickly applied to commercial broadcast systems, to military communications systems, and in laboratories. The state of the art has of course advanced far beyond the relatively crude apparatus shown here, but it is always good to have a working knowledge of the technology's history...

MPDevice: RF & Microwave Circulators & Isolators

MPDevice - RF CafeMPDevice (MPD) has become a trustworthy and reliable company in the global RF market as a manufacturer of passive RF Devices. Included are attenuators and terminations, coaxial connectors, adapters, and cable assemblies, DC blocks, surge arrestors, power combiner / dividers, and directional couplers. The Korean Telecommunication market is now entering into the era of hyperconnected society. With continuous enhancement in R&D capabilities and quality control, MPD will continue in an effort to become the No. 1 technologically innovative company with a focus on the emerging 5G marketplace.

Monday 22

First Radio Association: Wireless Association of America

First Radio Association: Wireless Association of America, January 1947 Radio-Craft - RF Cafe"The squeaky wheel gets the grease," is an old saw that has long been true when it comes to government policy, applying to common citizens and paid professional lobbyists alike when attempting to influence laws and regulations. Tactics range from letter writing, to peaceful town hall meetings and outdoor public gatherings, to court challenges, to large organized terrorist groups destroying property and livelihood (and often bodily harm). Some causes are unarguably righteous, peaceful and honest, while others use subversive methods to coerce policy makers into adopting their ideas. Such has been the case throughout history in all nations. Amateur radio operators have had a mostly amiable relationship with the Federal Communications Commission (FCC) since its inception in the early days of Marconi. However, due to the perceived needs (real and imagined) of wartime and commercial radio success, amateurs' privileges have been encroached upon numerous times, and it required the action of citizens to re-claim lost or prevent...

Interview Tips for Graduate Engineers

Interview Tips for Graduate Engineers - RF Cafe31-year veteran in the analog integrated circuit industry Ash Madni offers some advice to recent engineering graduates on interviews. Based on the wording of the title, "Interview Tips for Graduate Engineers," I thought the article was addressing engineers with graduate degrees, but not so; he is advising those with undergraduate degrees. Begins Mr. Madni: "After three or four years of hard study, you have graduated. Well done, and now the job hunting starts, writes Ash Madni, Head of Silicon Design at CML Microcircuits (UK) and a veteran of 31 years in the Analogue Integrated Circuit industry. Here are a few interview tips that you may find useful. My undergraduate year at Salford University I remember my first year as an undergraduate at Salford University, back in 1981. I was late for a lecture on network analysis..."

Thanks to PCB Directory for Continued Support!

PCB  Directory - RF CafePCB Directory is the largest directory of Printed Circuit Board (PCB) Manufacturers, Assembly houses, and Design Services on the Internet. We have listed the leading printed circuit board manufacturers around the world and made them searchable by their capabilities - Number of laminates used, Board thicknesses supported, Number of layers supported, Types of substrates (FR-4, Rogers, flexible, rigid), Geographical location (U.S., China), kinds of services (manufacturing, fabrication, assembly, prototype), and more. Fast turn-around on quotations for PCB fabrication and assembly.•

Notable Tech Quote

Notable Tech Quote: Hermann Göring on British Radio  - RF CafeOn the eve of World War II, the Brits built an amazingly successful twin-engined bomber called the D.H.98 Mosquito. It proved to be the bane of German cities, bridges, and dams. More than a decade after the aeronautics industry had switched from wooden to metal airframes, de Havilland engineers decided to design the craft using materials and techniques familiar to model airplane hobbyists - balsa, plywood, spruce, silk, and dope. The April/May 2020 issue of Air & Space magazine has a great article entitled "World War II's Strangest Bombing Mission" containing a quote from Hermann Göring which is like music to the ears (double entendre intended) of our English brethren. To wit: "Famously, the RAF's speedy wooden workhorses left a lasting impression on Göring. According to a 1973 history of the Luftwaffe, he later blustered, 'The British, who can afford aluminum better than we can, knock together a beautiful wooden aircraft that every piano factory over there is building... They have the geniuses and we have the nincompoops. After the war is over I'm going to buy a British radio set - then at least I'll own something that has always worked.'" Key up "God Save the King/Queen."

U.S.A. Calling - Uncle Sam Wants You

U.S.A. Calling - Uncle Sam Wants You, January 1942 QST - RF CafeWhen America was drawn into World War II after the attack on Pearl Harbor on December 7, 1941, the country snapped into action and our citizens were ready, willing, and able to help. One big immediate need was knowledgeable electronics technicians and engineers, particularly people with experience in radio communications. Amateur radio operators were the natural reserve source for just that need. The FCC shut down Ham radio transmissions in January 1942 ostensibly for security reasons, but some suspect the reason was at least partly to motivate Hams to enter the armed services or work at government research laboratories. Still feeling the lingering effects of The Great Depression that began with the Wall Street collapse in October 1929, many long-out-of-work citizens welcomed the chance to be gainfully employed once again - especially doing something they loved. Do you see anyone you know in that photo?

Exodus Advanced Communications: RF & Microwave Power Amplifiers

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.

Sunday 21

Technology-Themed Crossword Puzzle for June 21

Amateur Radio Crossword Puzzle for June 21, 2020 - RF CafeHere is the RF Cafe custom-made technology-themed crossword puzzle for the week of June 21st. Each week for two decades, for the sake of all avid cruciverbalists amongst us, I have created a new technology-themed crossword puzzle using only words from my custom-created lexicon related to engineering, science, mathematics, chemistry, physics, astronomy, etc. You will never find among the words names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort. You might, however, find someone or something in the otherwise excluded list directly related to this puzzle's technology theme, such as Hedy Lamarr or the Bikini Atoll, respectively. Enjoy!

   
Anatech Electronics (RF Filters) - RF Cafe PCB Directory (Assembly)
Res-Net Microwave - RF Cafe Res-Net Microwave - RF Cafe
About RF Cafe
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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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