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Homepage Archive - February 2022 (page 2)

See Page 1 | 2 | 3 | 4 of the February 2022 homepage archives.

Monday the 14th

The Radio Month - Analog Computer

The Radio Month, February 1951 Radio-Electronics - RF Cafe"The Radio Month" was a regular industry news briefs feature of Radio−Electronics magazine." In 1951 when this issue was published, nearly all computers were of the analog variety. The monstrous (in size) UNIVAC digital computer was not commissioned into operation until March of the same year (1951). Leading the report this month was Project Typhoon, an analog computer developed by RCA. It sported more than 4,000 vacuum electron tubes with 100 user-adjusted dials and 6,000 plug-in connectors or use in programming. According to the book The Analogue Alternative, "Project Typhoon was justifiably described as a 'veritable fountain head of improved computing elements.' One of the most important developments to come out of Project Typhoon as the invention of the chopper-stabilized, or drift-free, DC operational amplifier by E.A. Goldberg." In other news, new deposits of germanium had been discovered in New Jersey, of all places. Silicon had not yet become the dominant semiconductor...

Many Thanks to Aegis Power Systems for Their Continued Support!

Aegis Power Systems - RF CafeAegis Power Systems is a leading supplier of AC-DC and DC-DC power supplies for custom and special applications. Aegis has been designing and building highly reliable custom power supplies since 1995. They offer a complete line of switch mode power supplies and power converters for a variety of markets including defense, industrial, aircraft, VME, and telecom. Supports military, aircraft, EV, telecom, and embedded computing applications. Design and manufacture of custom power supply solutions to meet each customer's exacting specifications. Please visit Aegis Power Systems today.

Capacitors: Theory and Application

Capacitors: Theory and Application - RF CafeMin Zang has a useful article on the In Compliance website entitled "Capacitors: Theory and Application," which is a good primer on what a capacitor is, how it works, and what it it used for. It begins: "Capacitors are among the most commonly used components on a circuit board. With the ever-increasing number of electronics devices (from mobile phones to cars), there has been a growing demand for capacitors. A discussion on the subject of capacitors could easily become a book or a dictionary. To start with, there are different types of capacitors such as electrolytic, film, ceramic capacitors, and so on. Then, within the same type, there are different dielectric materials. There are also different classes. As for physical construction, there are two-terminal and three-terminal capacitor types. There's also an X2Y type capacitor which essentially is a pair of Y-capacitors packaged in one. What about supercapacitors? The fact is, if you sit down and start reading the capacitor selection guide of major manufacturers, you could easily spend a day..."

R&S Direction Finding & Monitoring Antenna System

Rohde & Schwarz Launches New High Performance Direction Finding and Monitoring Antenna System - RF CafeRohde & Schwarz announced the launch of the high performance R&S ADD557SR direction finding and monitoring antenna system. The system provides accurate direction finding capabilities across a wide bandwidth from 20 MHz to 6 GHz for both vertical and horizontal polarizations. It is ideal for R&S DDF550 wideband direction finders and R&S DDF5GTS high-speed scanning direction finders. The new direction finding antenna system incorporates the latest technologies, making it a high-end, versatile device for stationary and mobile applications on land, at sea and even in the air. This new antenna system is one of a kind and can do more than just direction finding. The R&S ADD557SR incorporates a separate antenna output that can be used independently of direction finding and in both polarizations over a wide frequency range. This helps focus on certain signals in the spectrum...

Thunderbolts and Whistlers

Thunderbolts and Whistlers, December 1956 Popular Electronics - RF CafeThe first electronic circuit I remember building as a budding teenage tinkerer was a "whistler" detector, aka a "sferic." Instructions and a schematic came from a project book I bought at Radio Shack. A whistler is a time-varying electromagnetic signal that decays in both frequency and volume over a short time - like sounds made by the eponymous fireworks genre. Having always had an interest in weather phenomena as part of my flying hobbies, it seemed like an apt learning endeavor. To my recollection, the whistler detector was a simple diode circuit with a couple Rs, Ls, and Cs strewn around in a particular configuration, and a long wire antenna. I can't honestly say whether or not any whistlers were ever heard with it. My interest was a layman's curiosity, but elsewhere in the world, professional scientists were expending a lot of effort in their attempts to analyze and quantify a whitler's particulars...

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

Sponsor RF Cafe for as Little as $40 per Month - RF CafeNew Scheme rotates all Banners in all locations on the page! RF Cafe typically receives 8,000-15,000 website visits each weekday. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 12,000 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.

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.

Sunday the 13th

Microwaves Theme Crossword Puzzle for February 13th

Microwaves Theme Crossword Puzzle for February 13th, 2022 - RF CafeThis custom made Microwaves theme crossword puzzle for February 13th is provided compliments of RF Cafe. All RF Cafe crossword puzzles are custom made by me, Kirt Blattenberger, and have only words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. As always, this crossword puzzle 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!

Please Visit Empower RF's Website in Appreciation of Their Support

Empower RF Systems - RF CafeEmpower RF Systems is a global leader in power amplifier solutions. Empower RF Systems is an established and technologically superior supplier of high power solid state RF & microwave amplifiers. Our offerings include modules, intelligent rack-mount amplifiers, and multi-function RF Power Amplifier solutions to 6 GHz in broadband and band specific designs. Output power combinations range from tens of watts to multi-kilowatts. Unprecedented size, weight and power reduction of our amplifiers is superior to anything in the market at similar frequencies and power levels.

Friday the 11th

RCA Promotion

RCA Promotion, February 1942 Radio News - RF CafeDavid Sarnoff was the president of Radio Corporation of America (RCA) during the war years (WWII), and in fact was commissioned in 1924 into the U.S. Army with the rank of lieutenant colonel. During WWII, he served in the office of the Chief Signal Officer in Washington, D.C., and in 1944 he was reinstated and promoted to brigadier general, going overseas to serve as Special Consultant on Communications to General of the Army Dwight D. Eisenhower at SHAEF in Europe. He directed strategic and logistical communications across all theaters of operation (Europe, Pacific, and Northern Africa). It is no surprise, then, that RCA played a huge role in the war effort providing both components and systems. This 1942 full-page promotion in Radio News magazine touting RCA's contributions and encouraging all citizens to do all he/she could is typical of those seen in the era...

Magic-Angle Graphene Switches from Superconductor to Ferromagnet

Magic-Angle Graphene Switches from Superconductor to Ferromagnet - RF Cafe"Magnetism and superconductivity are usually at opposite ends of the spectrum in condensed-matter physics. For them to appear in the same material is exceedingly rare. Yet that is exactly what Jia Li and colleagues at Brown University in the US found when they interfaced so-called 'magic-angle' graphene with a second two-dimensional material, tungsten diselenide. Thanks to a complex interaction between the two materials, the researchers succeeded in transforming graphene from a superconductor into a powerful ferromagnet - an achievement that could give physicists a new way to study the interplay between these two usually separate phenomena. Graphene is a 2D crystal of carbon just one atom thick. Even on its own, this “wonder material” boasts many exceptional properties, including high electrical conductivity as charge carriers (electrons and holes) zoom through the carbon lattice at very high speeds..."

Chart + Ruler All You Need to Know About Coil Design

This Chart and a Ruler Will Give You All You Need to Know About Coil Design, March 1930 Radio News - RF CafeHere is what an app looked like in 1930. Even in today's world with computing devices everywhere sporting simulators and component calculating programs, there are still times when having a good old fashioned nomograph or chart handy can be very useful while in sitting at a bench selecting component values for tweaking or troubleshooting a design. The advantage of such visual aids is that they provide a big picture of what's happening as frequencies, lengths, widths, core materials, etc. change - being able to see both the trees and the forest, so to speak. When you are working in bands where the component physical size is a significant portion of the wavelength, things get more complicated and a combination of trial and error and calculations / simulations are needed. At the IC design level, of course, you have no choice but to rely solely on your computer, but if you regularly conduct part of your circuit design at a lab bench, I recommend gathering a collection of these kinds of charts and graphs...

Webinar: Non-Destructive Microwave Evaluation of Radome Performance

Copper Mountain Technologies Webinar: Non-Destructive Microwave Evaluation of Radome Performance - RF CafeCopper Mountain Technologies is pleased to announce an online event coming up as part of our VNA Master Class Webinar series: "Non-Destructive Microwave Evaluation of Radome Performance." Hosted by Copper Mountain Technologies and Compass Technology Group, the webinar will be taking place on Wednesday, February 23, 2022 at 10:00 AM ET. Radomes can experience defects due to wear or impact events that degrade both mechanical and electromagnetic performance. Traditional radome testing often resorts to the crude "tap test" where an operator listens for sound changes with a tapping coin to detect defects. CTG has developed new and improved methods that integrate rugged microwave sensors and Copper Mountain's portable VNAs to significantly improve diagnostic testing of radomes. This webinar will provide a brief overview of the theory of microwave NDE methods for radome characterization. We will then demonstrate both handheld and robotic testing of radomes...

Carl & Jerry: Operation Worm Warming

Carl & Jerry: Operation Worm Warming, May 1961 Popular Electronics - RF CafeWhen becoming a licensed Ham a few years back, I learned that when broadcasting over amateur bands, the FCC requires you to transmit your station identification at the beginning of each session and then at least once every ten minutes. I hate to nit pick a "Carl & Jerry" story, but in this episode John Frye's intrepid electronics hobbyist duo rigs up their basement "shack" to automatically transmit the letter "A" in Morse code as a beacon signal to test reception in a cave. A timer would start the broadcast and it would run continuously for half an hour. Maybe things were different in 1961. The experiment intended to test a signal's ability to propagate through the Earth rather than through the air. It is an interesting twist on the skin effect of high frequency signals along a conductor. As you might suspect, the plan did not go exactly as intended, requiring Carl and Jerry to apply a bit of radio knowledge to get themselves out of peril...

RF & Electronics Symbols for Office™

RF & Electronics Schematic & Block Diagram Symbols for Office™ r2 - RF Cafe It 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!

Thanks to Anatech Electronics for Long-Time Support!

Anatech Electronics logo - RF CafeAnatech Electronics (AEI) manufactures and supplies RF and microwave filters for military and commercial communication systems, providing standard LP, HP, BP, BS, notch, diplexer, and custom RF filters, and RF products. Standard RF filter and cable assembly products are published in our website database for ease of procurement. Custom RF filters designs are used when a standard cannot be found, or the requirements dictate a custom approach for your military and commercial communications needs. Sam Benzacar's monthly newsletters address contemporary wireless subjects. Please visit Anatech today to see how they can help your project succeed. 

Thursday the 10th

Technology-Themed Comics, December 1961 Radio-Electronics

Technology-Themed Comics, November & December 1961 Radio-Electronics - RF CafeIt has been a couple weeks since I last posted any of the electronics-themed comics which frequently appeared in the vintage trade magazines. This sextet od comics came from the November and December 1961 issues of Radio−Electronics. I particularly like the first one from page 99. It depicts a great The Three Stooges type scenario. The comic from page 107 was ahead of its time in prognosticating electronic one-armed bandit machines. You would need to be familiar with the days of CRT televisions and the picture alignment process to fully appreciate the one on page 108. Anyway, feel free to include any of these or the hundreds of others linked at the bottom of the page in your next live presentation. They're a great segue into your next spiel on project progress (or lack thereof) or design techniques...

Thanks Again for Windfreak Technologies' 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.

Innovative Power Products (IPP) Expands Facilities

Innovative Power Products (IPP) Expands Facilities - RF CafeInnovative Power Products (IPP), a designer and manufacturer of RF and microwave passive components for more than three decades, is pleased to announce that due to an increased demand for our products we have expanded our facilities to boost production and test capacity by 60%. As part of our commitment to continual improvement and employee career enhancement, eleven members of IPP's Management Team have completed Dale Carnegie's Leadership Management Course. If you are interested in joining the IPP team as an RF/Microwave Design Engineer, please review the job description and contact us with your qualifications...

BLS Inflation Report out for 2021 - 7.5% Annually

Percent changes in CPI for All Urban Consumers (CPI-U): U.S. city average - RF CafeThat 7.5% increase in consumer prices from January 2021 through January 2022 is the average across all indexed items - highest since 1982 Carter era (some of us are old enough to remember that awful time). That, per the new Bureau of Labor Statistics (BLS) report. However, overall energy costs are up 27% and gasoline is up 40% (we went from energy independence and net exporter to primarily importer since January 2021).

CPI Building Materials & Department Stores - RF CafeCargo ships sit offshore waiting to be unloaded at port while store shelves are bare. Basic building materials costs are up 50% or more (framing lumber up 100%, Romex wire up 150%), and department store prices are up 20% or more (see graph).

 Anyone have an idea about what might be the cause of this rotten situation?

Teledyne Non-Latching SPDT RF Relays DC-18 GHz

Teledyne Relays Announces New Non-Latching, SPDT RF Relays for Both Through-Hole and Surface Mount Applications up to 18 GHz - RF CafeTeledyne Relays today announces new wide temperature range, hermetic relays operating up to 18 GHz. The new RF131 and GRF131 single-pole double-throw (SPDT) models are non-latching, offering fail-safe functionality. The new products expand rugged options available to key RF test and telecommunications markets. The RF131 and GRF131 non-latching models complement the widely respected equivalent through-hole RF121 and surface mount GRF121 magnetic latching relays from Teledyne Relays. With an operating temperature range from -55 to +85 °C, and glass-to-metal hermetic seals throughout, the new electromechanical switches offer fail-safe functionality up to 18 GHz and 40 Gbps data rates for the most challenging environments. The RF131 and GRF131 both come in an extended Centigrid® package with the heritage of Teledyne Relay's miniature RF relays by incorporating a precision transmission line structure in the internal construction of the contact...

McWatts Comic Strip

McWatts Comic Strip, December 1956 Popular Electronics - RF CafeMcWatts was an electronics-themed comic that appeared in Popular Electronics magazine back in the 1950s. Artist Carl Kohler's main character is a stereotypical "Joe Sixpack" type of electronics hobbyist who dreams up unique ways to deal with situations. This edition shows McWatts in a scenario where, presciently enough, he experiences having his radio controlled airplane treated to what modern day "drone" pilots are experiencing on a more and more frequent basis - being shot down. In this case the hostile fire came from some kids with slingshots. Fast-forward to 2015 and we are now seeing reports of people using shotguns and rifles to down the privacy-invading craft being piloted by unqualified pranksters. Back in the McWatts era, getting "shot down" was much more likely to occur when non-protected frequency usage (27 MHz band intermixed with the CB radio band) caused death-inducing interference...

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 stencil symbol has been built to fit proportionally on the included A-, B-, and C-size drawing page templates (or use your own page if preferred). Components are provided for system block diagrams, conceptual drawings, schematics, test equipment, racks (EIA 19", ETSI 21"), and more. Test equipment and racks are built at a 1:1 scale so that measurements can be made directly using Visio built-in dimensioning objects. Page templates are provided with a preset scale (changeable) for a good presentation that can incorporate all provided symbols...

Thanks Again to Axiom for Continued Support!

Axiom Test Equipment - RF CafeAxiom Test Equipment allows you to rent or buy test equipment, repair test equipment, or sell or trade test equipment. They are committed to providing superior customer service and high quality electronic test equipment. Axiom offers customers several practical, efficient, and cost effective solutions for their projects' TE needs and is committed to providing superior customer service and high quality electronic test equipment. For anyone seeking a way to offload surplus or obsolete equipment, they offer a trade-in program or they will buy the equipment from you. Some vintage items are available fully calibrated. Please check out Axiom Test Equipment today!

Wednesday the 9th

4 Elements Chart Laws of Chemistry

4 Elements Chart Laws of Chemistry - RF CafeMy daughter dragged me to an estate sale last weekend, and while there I found a stack of World War II era Life magazines, many of which had some useful articles on chemistry, electronics, and other subjects pertaining to technology being used to fight the battle against Communism, Nazism, Socialism, and other "ism's." This 2-page spread entitled "CHON - Four Elements Chart the Laws of All Chemistry" appeared in the March 23, 1942 issue. Today, such a diagram would be called an infographic. It explains the relationship that Carbon, Hydrogen, Oxygen, and Nitrogen (CHON) has with all the essential products and reactions in our everyday world. One modification to the article might be to increase the claim that only 20 out of the known 92 elements (at the time) comprise the makeup of the "vast bulk" of matter. While it doesn't explicitly name the 20, some elements like lithium (batteries), gallium, and arsenic (GaAs) now have a very large presence in the world's economy and might not have been so important in 1942...

Impact of Trees on 5G mmWave Signals

Impact of Trees on 5G mmWave Signal Propagation - RF Cafe"The National Institute of Standards and Technology (NIST) has started working on measuring the effect of trees on millimeter waves to improve the connectivity of future 5G antennas. As 5G technology gets fully implemented over the next several years, cellphones and other wireless tech will grow more powerful with increased data flow and lower latency. But along with these benefits, there are a number of challenges that need to be overcome. One such challenge is signal propagation at mm-Wave frequencies and the impact of obstacles in the propagation path. That's one way to describe the problem confronting cell network designers, who have to embrace both the benefits and shortcomings of millimeter waves. Not only can these waves carry more information than conventional transmissions do, but they also usefully occupy a portion of the broadcast spectrum..."

Teleguided Missiles

Teleguided Missiles, February 1947 Radio-Craft - Airplanes and RocketsHere is yet another example of how hobbyists laid the groundwork for technical innovations that were eventually adapted for use and improved by professional organizations - the military, universities, corporations. Radio control of model airplanes was first successfully achieved by a pair of brothers, Dr. Bill Good and Dr. Walt Good (kind of like the Wrights), who experimented with what were at the time rather crude engines and electronic and electromechanical devices. The year was 1936, only eleven years before this article appeared in Radio−Craft magazine reporting on the U.S. Army Air Force's and Navy's use of radio-controlled drones, or as the title says, "Teleguided Missiles." Some systems were designed from the ground up to be missiles while others were systems installed in existing aircraft which had been decommissioned for normal human-piloted use. They were sort of a Kamikaze craft without the expendable airman inside...

Synzen Antennas Help Simplify IoT Prototyping

Synzen Antennas Help Simplify IoT Prototyping - RF CafeSynzen Precision Technology, a leading supplier of antennas and antenna module solutions, has teamed up with venture studio Next Big Thing AG (NBT) to produce the sensor-based LTE-M/NB-IoT development platform Prometheus which promises fast cellular IoT prototyping. The new Prometheus platform showcases Synzen's leading expertise in LTE 4G and GNSS antenna solutions when combined with the latest Nordic nRF9160 module to provide unrivalled 4G connectivity combined with high performance and industry best GNSS positioning solutions. The building blocks enabling the new mobility and IoT revolution are "always on" connected 4G cellular and accurate and reliable GNSS solutions...

Another Inductive Coupling System for Rotary Beams

Another Inductive Coupling System for Rotary Beams, September 1950 QST - RF CafeComplete with all the nitty-gritty details and necessary formulas for designing an inductive loop coupler for a rotating antenna is this 1950 QST magazine article by Mr. Robert Mumma. Such a device is useful when you desire a steerable antenna that prefers not to or cannot accommodate a section of coaxial cable interfacing the fixed mast to the rotating antenna. It is rare that such a requirement is found, since installing a set of limit switches to prevent the cable from wrapping itself around the mast is relatively simple to implement. However, if you want a system that continually rotates while searching for or broadcasting signals, then something like this is needed. A radar antenna is a prime example, as would a search and rescue operation using a directional antenna listening to distress calls be another. There is also a "cool factor" that might cause you to build and install one...

RF Cascade Workbook

RF Cascade Workbook - RF Cafe RF Cascade Workbook 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...

Many Thanks to Centric RF for Their Continued 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.

Tuesday the 8th

Serviceman's Experiences

Serviceman's Experiences, July 1940 Radio News - RF CafeAs someone who, many moons ago as an electrician, made lots of service calls to both households and businesses, I am somewhat familiar with the whims and quirks of strangers who have summoned you to his or her place in order to be serviced. Most are courteous in a business-like manner and expect you to get the job done in the most efficient and effective manner as possible in order to keep the cost down. Time and material is the usual modus operandi for service calls. On occasion a customer would stand around and talk about the job at hand - what caused the problem, how it would be repaired, and how to avoid a repeat in the future. Others were just gabby, which I didn't mind as long as it didn't get in the way of completing my appointed task. The problem comes when the person acts like you are to blame for whatever bedevils them and nothing you do is good enough, whether you are presumably too slow, too stupid, too unwilling to take sage advice, etc. Those types are the bane of a serviceman's existence. Do the world a favor and determine you will never join their ranks...

Please Thank RF & Connector Technology for Their Support

RF & Connector Technology - RF CafeProviding full solution service is our motto, not just selling goods. RF & Connector Technology has persistently pursued a management policy stressing quality assurance system and technological advancement. From your very first contact, you will be supported by competent RF specialists; all of them have several years of field experience in this industry allowing them to suggest a fundamental solution and troubleshooting approach. Coaxial RF connectors, cable assemblies, antennas, terminations, attenuators, couplers, dividers, and more. Practically, we put priority on process inspection at each step of workflow as well as during final inspection in order to actualize "Zero Defects."

Miniature Atomic-Powered Battery

Miniature Atomic-Powered Battery, May 1957 Radio & TV News - RF CafeEvidently the procurement cost of promethium 147 never fell low enough to make it affordable by the masses. If it had, though, according to this 1957 Radio & TV News magazine article we might all have been wearing nuclear-powered Elgin National Watch Company timepieces in the last century rather than Timex. Beta particles from the radioactive decay of promethium 147 impinge upon special crystalline components that generate enough electricity in this cell to power a watch for five years or more. I wonder, had it been successful, how long it would have been before 'that persistent rash' on people's wrists and upper thighs (for pocket watch users) was determined to be due not to a metal allergy, but to a radiation burn? It is amazing such schemes were ever considered, but then again I still have dental fillings with lead amalgams in them...

Anatech Electronics Early February Product Intro

Anatech Electronics Early February Product Intro - RF CafeAnatech Electronics offers the industry's largest portfolio of high-performance standard and customized RF and microwave filters and filter-related products for military, commercial, aerospace and defense, and industrial applications up to 40 GHz. Three new filter models have been introduced - a 10 MHz crystal bandpass filter, a 2155 MHz connectorized ceramic bandpass filter, and a 1747.5 Hz ceramic bandpass filter. Custom RF power directional coupler designs can be designed and produced when a standard cannot be found, or the requirements are such that a custom approach is necessary...

GHz Phased-Array Antenna Fabricated as Large-Area Sheet

GHz Phased-Array Antenna Fabricated as Large-Area Sheet - RF Cafe"Using large-area electronic fabrication techniques, a team has constructed and tested a three-element GHz-range phased-array antenna. Phased-array antennas are taking on increasing roles in MIMO systems such as 5G, as they can provide needed dynamic, all-electronic antenna steering and directivity. However, they have an attribute that complicates their physical and electrical fabrication - they're composed of multiple identical, discrete antennas elements with form factors that aren't amenable to mass-production techniques. Responding to this dilemma, a team based at Princeton University devised and tested a technique for creating electronically steerable, GHz-range phased-array antenna assemblies as large-area electronics (LAE). They applied fabrication processes used for electronic circuits on thin, flexible materials..."

Cincinnati Electric Products Company Ad

Cincinnati Electric Products Company Ad, January 1945 Radio News - RF CafeI'm guessing once word got out about the Fusite advertisement in the 1945 edition of Radio News magazine, there was a sudden surge of interest in buying electronics magazines by young boys who also collected certain editions of National Geographic. Even by today's rather loose decency standards this mermaid depiction would undoubtedly cause an outcry. Imagine my shock in turning to page 90 and seeing this illustration! Why, I had to stare at it for many minutes to believe what was before my tender eyes ;-) Of course since RF Cafe is a family friendly website I did the responsible thing and blurred the offending anatomical portion of Cincinnati Electric Products Company's aquatic vamp. I checked the "Letters from Our Readers" column for the succeeding few months and did not see any complaints printed. Neither did I see that ad appear again...

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

Sponsor RF Cafe for as Little as $40 per Month - RF CafeNew Scheme rotates all Banners in all locations on the page! RF Cafe typically receives 8,000-15,000 website visits each weekday. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 12,000 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.

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! 

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DC-70 GHz RF Cables - RF Cafe

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


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 tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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

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

My Daughter's Website: EquineKingdom

Innovative Power Products Passive RF Products - RF Cafe

Innovative Power Products Passive RF Products - RF Cafe

Exodus Advanced Communications Best in Class RF Amplifier SSPAs