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Homepage Archive - December 2021 (page 2)

See Page 1 | 2 | 3 | 4 of the December 2021 homepage archives.

Tuesday the 14th

Bell Telephone System, Guadalcanal Exchange

Bell Telephone System, Guadalcanal Exchange, May 29, 1943, The Saturday Evening Post - RF Cafe"War is hell," as famously stated in various forms by notable generals. This advertisement by Bell Telephone System appearing in the May 29, 1943, issue of The Saturday Evening Post magazine bears witness to one aspect of it. Per the piece, "Wire repair crews are made up of four men. Three stand guard while the other works." While U.S. Marine Corpsmen and civilian technicians were installing and maintaining telephone communications in war-torn regions in the European, African, and Pacific Theaters of Operation, personnel and material shortages back home required learning to live without some of what were previously routine products and services. Citizens were expected to patriotically sacrifice their creature comforts for the sake of their country; most did so. Note that the cover art for this issue happens to be the famous "Rosie the Riveter" painting by Norman Rockwell...

Inertial Guidance Directs Planes and Missiles

Inertial Guidance Directs Planes and Missiles, December 1958 Radio-Electronics - RF CafeWerner von Braun and his team of rocket scientists are credited with developing the first useful inertial stabilization platforms for ballistic missiles. The infamous and formidable V2 rocket wreaked terror upon the heads of Londoners during the latter days of World War II. It served to keep the rocket in a fixed orientation during the boost phase of the flight, but did not serve any active targeting function. Inertial navigation systems, on the other hand, are used to provide both accurate positional and attitude information for the pilot (if the platform has one) and to steer the platform (vehicle) to a predetermined destination. Inertial navigation systems are therefore much more complex. Early inertial navigation systems relied on physical spinning gyroscopes mounted within a series of nearly frictionless gimbals to maintain a fixed reference position in space. Contactless encoders about the rotation axes of the gimbals sent positional information to a computer, which then performed necessary calculations and sent formatted data to visual flight instruments...

Many Thanks to Berkeley Nucleonics for Continued Support!

Berkeley Nucleonics Corp - RF Cafe Berkeley 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.

Producer Price Index up 9.6% YoY

Producer Price Index up 9.6% YoY - RF CafeThis just breaking from the U.S. Bureau of Labor Statistics: "The Producer Price Index for final demand increased 0.8% in November, seasonally adjusted, the U.S. Bureau of Labor Statistics reported today. Final demand prices moved up 0.6% in each of the 3 prior months. On an unadjusted basis, the final demand index rose 9.6% for the 12 months ended in November, the largest advance since 12-month data were first calculated in November 2010. In November, the index for final demand services rose 0.7% and prices for final demand goods increased 1.2%." Scan through some of the detailed tables where you will see some Unprocessed Goods for Intermediate Demand were up >50%..."

The FCC's Kilocycle Kops

Kilocycle Kops, January 1956 Popular Electronics - RF CafeExcept under special circumstances, the Federal Communications Commission (FCC) does not conduct much frequency monitoring activity. I know first-hand that even when a report of radio frequency interference (RFI) is made to them, you will be told to figure out the source on your own and then get back to them*. There have been a lot of news items lately where the FCC has levied heavy fines on Ham operators found to be in violation of the regulations, and usually not because of independent complaints. This article from a 1956 edition of Popular Electronics magazine relates some of the cases experienced by guys in the FCC Field Engineering and Monitoring Bureau's according to "Negotiated Rulemaking Committee" (NRMC - now defunct) records...

Skyworks Si4694 Digital Radio Coprocessor

Skyworks Si4694 Digital Radio Coprocessor - RF CafeSkyworks is pleased to introduce the Si4694 digital radio coprocessor for DRM for AM radio reception in automotive infotainment systems and car radios. Designed to work with Skyworks' Si479xx family of automotive radio tuners, the Si4694 provides a new level of performance and power efficiency with the lowest system BOM. The Si4694 is part of the Falcon family of automotive digital radio coprocessors. The Si4694 provides demodulation and source decoding of DRM for AM signal delivering audio and data. It supports all operating modes of the DRM for AM digital radio standard (Modes A to D). The Si4694 is a highly integrated device that requires only a few external components. The Si4694 generates its internal clocking from an external crystal using an integrated oscillator...

Post Your Engineer & Technician Job Openings on RF Cafe for Free

/jobs.htm" target="_top"> 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 /jobs.htm" target="_top">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...

Many Thanks to LadyBug Technologies for Their Continued Support!

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

Monday the 13th

Transmission Lines Simplified

Transmission Lines Simplified, October 1952 Radio-Electronics - RF CafeTransmission lines have always been a mystery to beginners in the RF field - both to newly branded engineers and to hobbyists and technicians. Many magazine articles on the topic have been written over the decades, and this one from a 1952 issue of Radio-Electronics is as good of a primer as any I have seen. Author Hector French incorporates many visual aids (aka drawings) to assist the uninitiated transmission line student grasp the concepts of impedance matching, standing waves, power transfer, etc. The only math in the entire article is characteristic impedance = voltage / current, and it does not include any scary talk about complex numbers with real and imaginary parts...

Global Chip Shortage: What You Need to Know

Global Chip Shortage: What You Need to Know - RF CafeThe OurPCB website has some nice articles on a wide range (>200) of subjects of interest to RF Cafe visitors. "Simple FM Radio: All You Need to Create One" presents the basics of FM radio and a simple DIY circuit for building one. "LC Oscillator: Circuit Working, Types, and Applications" is a good primer on the topic. One of the latest is of concern to many designers these day: "Everything You Need to Know About the Global Chip Shortage." It begins: "They are small and inconspicuous, but semiconductors are the driving force behind almost every modern technology. Today, millions of products like cars, smartphones, game consoles, and microwaves rely on computer chips, also known as semiconductor chips. However, there aren’t enough semiconductor chips to meet current demand, causing many products to short supply. Why are semiconductor chips important? Why is the world facing a shortage of semiconductor chips?..."

Interview with KN3NOB

Interview with KN3NOB, March 1963 Popular Electronics - RF CafeDave Harbaugh drew the semi-regular "Hobnobbing with Harbaugh" series of comic strips in Popular Electronics. His themes were always in the situational comedy style of the day where Ham operators were depicted as victims of their own obsession with amateur radio, their wives' lack of an equal obsession with amateur radio, or being at the mercy of some well-meaning but ignorant neighbor, police officer, store clerk, or other such individual. This particular comic has an on-the-scene TV anchorman making KN3OB's life heck...

Synzen's Small and Mighty Tri-band Wi−Fi 6 SMD Antennas

Synzen's ADARA1 & 2 - Small and Mighty Tri-band Wi-Fi 6 SMD Antennas - RF CafeThe magic trick of modern electronics is to keep making things smaller and even more powerful. Designed by Synzen Precision Technology, their latest SMD antennas, ADARA1 and 2, are marvels of miniaturization. ADARA is a compact and complete solution for Wi-Fi 6 and 6E applications. It is suitable for devices requiring an integrated antenna solution and which demand high performance from an ultra-small form factor. With a footprint of only 9.0 x 5.8 x 1.1 mm, ADARA is a corner mounted SMD antenna for simple integration. This tri-band antenna is also ideal for MIMO applications using multiples of ADARA antennas all on the same PCBA...

Japan's OMOTENASHI to Put Ham Radio on Moon

World’s Smallest Moon Lander from Japan will Put Ham Radio Transmitter on the Moon - RF Cafe"Japan's OMOTENASHI, the world's smallest moon lander, will have an X-band and UHF communication system, although it will not carry an amateur band transponder. OMOTENASHI is a 6U CubeSat set for launch via a NASA SLS rocket as early as February 2022. It will have a mission period of from 4 to 5 days. The name is an acronym for Outstanding Moon Exploration Technologies demonstrated by Nano Semi-Hard Impactor. Wataru Torii of the Japan Aerospace Exploration Agency (JAXA) Ham Radio Club, JQ1ZVI, said radio amateurs can play a role in gathering data from the spacecraft. The spacecraft is made up of two separable components, both having independent communication systems - an orbiting module and a surface probe. The orbiting module will take the surface probe to the moon. It will transmit beacon or digital telemetry data on UHF (437.31 MHz)..."

RF Cascade Workbook

RF Cascade Workbook - RF CafeRF 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 Exodus Advanced Communications for Their Support

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

Sunday the 12th

Science Celebrity Theme Crossword Puzzle for December 12th

Science Celebrity Theme Crossword Puzzle for December 12th, 2021 - RF CafeThis Science Celebrity themed crossword puzzle for December 12th contains no fewer than 18 names of notable scientists and engineers (marked with an asterisk *) known famously to folks like you who visit RF Cafe. It took quite a while to design. Elsewise, only clues and words which are directly to RF, microwave, and wireless engineering, optics, mathematics, chemistry, physics, and other science subjects. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort...

Many Thanks to Withwave for Continued Support!

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

Friday the 10th

Our Electric Universe

Our Electric Universe, October 1952 Radio-Electronics - RF CafeHugo Gernsback had a vivid imagination, creativity, and foresight. Throughout the many decades he penned editorials for his magazines and authored many books - both fiction and technical - Mr. Gernsback made scores of predictions which came to fruition (as well as far fewer which did not). In 1952 he published an editorial in Radio-Electronics magazine entitled "Our Electric Universe," wherein he postulated the immense amount of energy impinging upon the Earth being transformed into useable forms like electricity, heating water for environment conditioning, directly driving machinery, and other innovative scenarios. Is it sort of a follow−up on "The Celestial Audion" he wrote in a 1922 issue of his Radio−News magazine which likened the makeup of the cosmos to a vacuum tube. In this article, capturing cosmic rays and other forms of extraterrestrial...

Axiom Test Equipment 2022 Top Hits Calendar

Axiom Test Equipment 2022 Top Hits Calendar - RF CafeMany companies (particularly those which are not publically traded on the stock market and answer to trouble-maker stockholders) still send "real" Christmas cards to clients. Axiom Test Equipment, a long-time RF Cafe sponsor, is one of those companies. This year, along with a very nice Christmas card, the great folks there sent me undoubtedly the coolest custom-designed calendar I have ever seen - the Axiom Test Equipment 2022 Top Hits Calendar. As you can see in the images below, the "Top Hits" theme borrowed off some well-known Top 40 type bands whose names lend themselves to slight alteration for matching with some the gear handled by Axiom Test Equipment. I particularly like the "AC/DC Loads" meme (AC/DC) for the January calendar page, and also the December page featuring the Transient Generator Orchestra (Trans−Siberian Orchestra). A couple of the months' bands are admittedly not as familiar to me...

Designing, Developing and Deploying CubeSats

Designing, Developing and Deploying CubeSats - RF Cafe"In 1999, a collaborative effort of Jordi Puig-Suari, a professor at California Polytechnic State University and Bob Twiggs of Stanford University, created the reference design for CubeSats. They maintained that the proposed platform can help reduce the cost of technical developments and scientific investigation. This reduction escalated the access to space, leading to diversification of its use, and researchers found it a great platform for quick deployment of their proposals. What Is a CubeSat? A CubeSat is a miniaturized spacecraft that orbits the earth. As the name suggests, CubeSat is shaped like a cube of about 10 cm in length, breadth and depth. This is called one unit or 1U. It is very lightweight, weighing not more than 1.33 kilograms. CubeSats can be stacked together to form a larger CubeSat of two, three or even six units. Once in space, this can be used in a variety of applications. CubeSats are economical and reduce launch cost to a consider able extent...

ConductRF Flexible RF Cable Assemblies to 18 GHz

ConductRF Flexible RF Cable Assemblies to 18 GHz - RF CafeConductRF LSA series of Low Loss, Performance Flexible RF cable assemblies, provide microwave system designers with a versatile solution for most applications. Here we offer customers a solution for 0.086" dia. cable that facilitates greater flexibility and handling or, 0.141" dia. that exploits the same great performance but with almost half the loss. Connector options include SMA, Type-N, TNC & SMP that provide excellent VSWR between DC and 18 GHz, also solutions for MCX & SMB are available in a wide array of configurations. These assemblies are built using our own double shielded, FEP jacketed cable, that was developed specifically for performance solutions...

Comics with an Electronics Theme

Comics with an Electronics Theme - RF CafeUnashamedly I offer up these vintage yet timeless electronics-themed comics for your enjoyment. I added color to make them more interesting. I freely admit to reaching for the comics page(s) of the newspaper to read the latest antics of Beetle Bailey, Dilbert, Hagar the Horrible, Garfield, Dennis the Menace, Peanuts, Blondie, and many others. As if that was not bad enough in some people's opinion, what would really keep me from getting invited to any more high class dinner parties* if the word got out is the fact that I actually try to spot the 6 differences in Slylock Fox. Melanie and I also like to work the crossword puzzles together; supposedly that helps keep ageing gray matter from undergoing atrophy...

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.

Thursday the 9th

Servicing Test Instruments: Peter and the Pilot Light

Servicing Test Instruments: Peter and the Pilot Light, October 1952 Radio-Electronics - RF CafeIncandescent pilot lights are definitely a thing of the past; LEDs are the ubiquitous choice these days for obvious reasons (low cost, low current, long life). Nonetheless, there are still lots of equipment still in service that do use them. In 1952 when this article appeared in Radio-Electronics magazine, incandescent (and neon) lamps were standard in test gear, radios, televisions, tape recorders, record players, kitchen appliances, cars, industrial machinery, and many other everyday things. Electronics repairmen needed to deal with them on a regular basis. Although not technically sophisticated, knowing a little something extra about the little bulbs could be quite handy. One tidbit if useful info in this article is how the color of the little glass bead that mounted the filament to the base was often a clue to the current draw of the lamp at nominal operating voltage...

When They Electrified Christmas

When They Electrified Christmas  - RF CafeAs I have noted in before, I greatly appreciate the fact that throughout all the years (decades, actually) of political correctness buffoons and most recently the "cancel culture" Nazis, IEEE's Spectrum magazine has not bent to the pressure of ignoring and/or demonizing the electrical / electronics industry's significant history. Their authors and editorial staff have consistently provided meaningful stories that fairly and honestly present information relevant to our hobbies and/or livelihoods. This piece entitled "When They Electrified Christmas" is a great example of that which I claim. Author Allison Marsh begins, "In much of the world, December is a month of twinkling lights. Whether for religious or secular celebrations, the variety and functionality of lights have exploded in recent years, abetted by cheap and colorful LEDs and compact electronics..."

Testing EMI Materials for Battlefield Applications

Testing EMI Materials for Battlefield Applications - RF CafeThis article entitled "Testing EMI Materials for Battlefield Applications" recently appeared on the Aerospace Defense website. It begins: "Aerospace and defense technology must operate reliably in a wide variety of extreme conditions, including very high and very low temperatures and amid saltwater and harsh chemicals (from deicing fluids to missile fuel). Further, manufacturers must meet stringent requirements. As a result, the testing regimen involved in ensuring battlefield readiness is complex and multifaceted - not only for the devices that end up in soldiers' hands, but also for the many component parts that make those devices work. We've spent decades developing the materials that mitigate electromagnetic interference in aerospace and defense electronics. The testing regimen for these EMI materials has grown more complex and multifaceted in recent years, for a couple reasons: Electronics are getting smaller and more powerful..."

How to Interpret Standard Ratings for Meter Accuracy

How to Interpret Standard Ratings for Meter Accuracy, May 1934 Radio News and the Short-Wave - RF CafeEven with the ubiquitous (and inexpensive) presence of digital multimeters, there are still times when a meter sporting an analog movement is more useful than a numerical display. This is especially true is when a reading is varying about a mean value rather than being fixed. Sampling and display update times of digital meters can be too slow to realistically reflect what a time-varying signal is doing. An analog meter's pointer can more readily be followed than needing to read and mentally comprehend a rapidly changing numerical value. Digital meters are great for reading a fixed value or for precisely setting a fixed value, but tracing signals through a circuit with a digital meter can be very misleading because unless you are mainly interested in DC bias levels, the information presented can be misleading. In order to use an analog meter meaningfully, you really need to understand...

Visio to Be Bundled with Office 365

Visio to Be Bundled with Office 365 - RF CafeGood News! A web app version of Visio is being integrated into Office 365 subscription per this Microsoft news item: "A lightweight version of the Visio web app is currently rolling out to all Microsoft 365 commercial subscribers." Until it is available with your version, the standard $5/month Visio plan is all you need to be able to use the magnificent RF & Electronics Symbols for Visio collection of more than 1,000 shapes. You can also get the Office 365 Personal plan for a mere $5/month so you will have access to all the Office applications that can utilize the RF & Electronics Symbols for Office collection of more than 1,000 shapes. With Excel, you can benefit from the amazing RF Cascade Workbook system designer.

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...

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.

Wednesday the 8th

Reaching the Ruralist - Innovative Thinking

Reaching the Ruralist, October 1945 Radio News - RF CafeInnovation, out-of-the-box thinking has been responsible for a large part of the world's more successful ventures - ranging from small-time operators to the corporate and university scale. The "War Years" were notably difficult for a lot of businesses not directly involved in wartime production and/or service due to the shortage of supplies and workers. Radio News magazine and others of the era printed many stories to both inform and encourage electronics industry participants. This October 1945 story tells of how radio service and sales shop owner Pat Murphy, of Carthage, New York, devised a system to successfully tap an otherwise avoided customer base - rural farm and home owners. His scheme made a lot of people happy and provided a source of income to others as a reward for facilitating the endeavor. "Reaching the Ruralist" is a great, short read...

Listening to Byrd on Short-Wave Radio

Listening to Byrd on Short-Wave Radio, July 1934 Radio News and the Short-Wave - RF CafeLittle America was a series of Antarctic exploration bases begun by Admiral Richard Byrd in 1929, located on the Ross Ice Shelf, south of the Bay of Whales at the South Pole. In those days such expeditions captivated the imaginations of Americans and folks worldwide for that matter. CBS radio broadcasted a weekly show that featured in part communications from Byrd's team. Listeners sat in rapt attention as the announcer described the S.S. Jacob Ruppert passage through the Panama Canal en route to New Zealand and then on to the South Pole for the "Byrd Antarctic Expedition II." As reported in this 1934 issue of Radio News magazine, KFZ, Byrd's station call sign, used an aerial constructed of a horizontal, diamond-shaped type known as a Bruce antenna. The wires are stretched between four 60-foot telegraph poles. Shortwave frequencies between 6,650 and 21,625 kilocycles were accessible by both amateur radio operators and by non-technical types with their commercial receivers...

Modelithics Components Library for Keysight SystemVue

Modelithics System Components Library for Keysight SystemVue - RF CafeModelithics is pleased to announce the Modelithics System Components Library for Keysight PathWave System Design (SystemVue). This library includes models for system-level components like amplifiers, filters, attenuators, couplers, and packages. Models are available for components from a wide range of manufacturers, including Barry, IMS, Kyocera AVX, Mini-Circuits, Murata, and Qorvo. In total, the current Modelithics System Components Library offering contains nearly 160 models. Combining Keysight PathWave System Design (SystemVue) with the Modelithics System Components Library makes it possible for designers to predict system performance in the presence of real-world environmental effects like interference...

Winds Power Electric Fields in Upper Atmosphere per ICON

Winds Power Electric Fields in Upper Atmosphere per NASA's ICON - RF Cafe"What happens on Earth doesn't stay on Earth. Using observations from NASA's ICON mission, scientists presented the first direct measurements of Earth's long-theorized dynamo on the edge of space: a wind-driven electrical generator that spans the globe 60-plus miles above our heads. The dynamo churns in the ionosphere, the electrically charged boundary between Earth and space. It's powered by tidal winds in the upper atmosphere that are faster than most hurricanes and rise from the lower atmosphere, creating an electrical environment that can affect satellites and technology on Earth. The new work, published today in Nature Geoscience, improves our understanding of the ionosphere, which helps scientists better predict space weather and protect our technology from its effects..."

QSO Today Virtual Ham Expo 2022

QSO Today Virtual Ham Expo 2022 - RF CafeThe QSO Today Virtual Ham Expo will return on the weekend of March 12th, 2022. This is a call for Speakers and Presentations. "The key to the 'Expo's' reach and influence is the wide variety and scope of presentations and speakers that come to the Expo. From the thousands of messages received since starting the Expo, in August 2020, your presentations make a difference in the lives of the amateurs that attend and view them, and they open the minds of amateurs to the possibilities that our amazing hobby offers to everyone young and old. Unlike other conventions, meetings, and Hamfests, the QSO Today Virtual Ham Expo has the ability to offer more opportunities for amateurs to make presentations that will be seen and shared by thousands of hams that come to the Expo...

Triplett Instruments

Triplett Instruments, September 1942 Radio Retailing Today - RF CafeTriplett is a well-know name amongst electronics technicians and engineers who have been in the business for any length of time. Triplett meter movements (aka panel meters) were considered to be top-of-the-line product in the days before digital meters and displays. They were used in industrial instrumentation, in military equipment, and in amateur radio gear. Triplett is still in business today but it appears they no longer sell just meter movements, although there is a large supply (new and used) available on eBay and Ham radio websites and swap meets. This advertisement for Triplett Thin-Line Instruments appeared in the September 1942 edition of Radio Retailing Today magazine...

RF & Electronics Symbols for Office™

RF & Electronics Schematic & Block Diagram Symbols for Office™ r2 - RF CafeIt was a lot of work, but I finally finished a version of the "RF & Electronics Schematic & Block Diagram Symbols" that works well with Microsoft Office™ programs Word™, Excel™, and Power Point™. This is an equivalent of the extensive set of amplifier, mixer, filter, switch, connector, waveguide, digital, analog, antenna, and other commonly used symbols for system block diagrams and schematics created for Visio™. Each of the 1,000 or so symbols was exported individually from Visio in the EMF file format, then imported into Word on a Drawing Canvas. The EMF format allows an image to be scaled up or down without becoming pixelated, so all the shapes can be resized in a document and still look good. The imported symbols can also be UnGrouped into their original constituent parts for editing. Check them out!

Many Thanks to Axiom Test Equipment for Continued Support!

Axiom Test Equipment - RF Cafe Axiom 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!

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