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Homepage Archive - August 2020 (page 1)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page. About RF Cafe.

Homepage Archive Pages

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 | 5 | of the August 2020 homepage archives.
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Friday 7

QSO Today Virtual Ham Expo August 8th & 9th

QSO Today Virtual Ham Expo - RF CafeParticipate in this ground breaking, virtual international amateur radio expo. Packed with world renowned speakers, exhibitors, and special conference rooms built on a virtual reality platform. Attend from the convenience of your desktop, laptop, tablet, or smartphone. QSO Today Virtual Ham Expo coming to your laptop, tablet, and smartphone on: August 8th and 9th (that's this weekend). QSO Today called on its former guests and other expert amateur radio operators to create an amazing series of lectures in webinar format from one of our five virtual lecture halls. All lectures are: Fully live interactive with speaker during the session hour, Completely downloadable after the weekend, Collateral materials are downloadable in PDF format, Everything available up to 30 days.

Loops vs. Dipole - Analysis and Discussion

Loops vs. Dipole - Analysis and Discussion, August 1976 QST - RF CafeComputer analysis in 1976 was a job performed on a corporate, university, or government mainframe. Radio Shack's TRS-80 came out in 1977, but it did not have the capacity to calculate and plot antenna gain charts like the one in this QST article. Yes, an ambitious programmer could write the code necessary to perform the double integrals presented in the article, but to do all the figuring needed to create all the graphs in Figure 4, the job would just about be finishing up today - and that's not too much of an exaggeration. For some reason the authors never mention what computer was used or where it was based. When I saw the title of "Loops vs. Dipole," I expected the loop to be round or square, but for analysis purposes it was modeled as a pair of parallel elements representing the horizontal components of a square loop antenna. Justification for omission of the vertical sides...

The 1st Time-Zone-Delayed TV Broadcasts

The 1st Time-Zone-Delayed TV Broadcasts - RF CafeMr. Chris B., a colleague of mine at Comsat, in Germantown, MD, way back in the early 1990s, was/is a big fan of vintage audio and video gear and test equipment. In fact, he worked at a sideline business repairing vacuum tube equipment. Chris was also a semi-rigid coax cable bending and routing master if memory servers me. He visits RF Cafe on a regular basis because of the article post from last-century electronics magazines. Anyway, he sent me a link to a story about the first documented use of magnetic tape (Ampex quad videotape) in 1956 for time-delaying east coast broadcasts to equivalent time slots on the left coast. Prior to that, kinescopes were used to relay broadcasts live so the 6:00 pm and 11:00 pm east coast news broadcasts from ABC, CBS, and NBC were shown at 3:00 and 8:00, respectively, in LA and Seattle. Prime time shows ran from 5:00 - 8:00 pm Pacific time, which was very inconvenient to the locals' schedules. Here is a 1958 Radio-Electronics article entitled, "4-Track Stereo Tapes Coming."

Thanks Again 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. 

Drones Transforming How Telcos Inspect Towers

Drones Transforming How Telcos Inspect Towers - RF Cafe"Drone technology offers a powerful way for enterprises to conduct remote asset inspections during and after the Covid-19 pandemic. The demand for drones among enterprises is forecast to continue to grow over the next few years, with Gartner predicting that shipments of enterprise drones will reach 1.3 million by 2023. Telcos and MNOs are already leveraging drone technology to automate cell tower inspections, boost operational efficiency, and accelerate the rollout of 5G infrastructure. As connectivity improves and automation increases, we can expect to see drones at the edge, completing autonomous missions, and uploading data directly to the cloud, bringing substantial business benefit to telcos and other enterprises..."

San Francisco Circuits Publishes the Importance of PCB Trace Widths in PCB Design

San Francisco Circuits Publishes the Importance of PCB Trace Widths in PCB Design - RF CafeSan Francisco Circuits (SFC) shares in a recently published article entitled, "The Importance of PCB Trace Widths in PCB Design," that there are a variety of applications that demand specific trace layout characteristics and how or when to incorporate them into PCB designs. A specific PCB application will determine trace widths and trace types in a PCB design and a balance should be maintained between PCB fabrication cost, board density/size, and performance. The purpose of a PCB trace is to connect any kind of electrical signal - analog, digital, or power - from one junction to another. And if a PCB has specific design requirements such as speed optimization, noise or coupling mitigation, or high current/voltage, the trace widths and types might be more important than optimizing for manufacturing cost of the bare PCB or overall board size...

Les Paul: Technician and Musician

Les Paul: Technician and Musician, October 1958 Radio-Electronics - RF CafeIf I told you that Lester William Polsfuss is widely credited with being a major player in the pioneering of electric guitars due to his solid-body (no acoustic resonance chamber) designs, you might wonder where I came up with that claim. However, if you know that Mr. Polsfuss is the surname of Les Paul, then you would quickly agree. As if being a popular musician and, along with wife Mary Ford, selling millions of records wasn't enough, Les Paul was also an experimenter and inventor in the electronic music realm. This article entitled "Les Paul: Technician and Musician" appeared in a 1958 article in Radio-Electronics magazine, and was at the time a contemporary look inside his home-workshop-studio, when he was first gaining popularity...

Many Thanks to ISOTEC for Continued Support!

ISOTEC Corporation - RF CafeSince 1996, ISOTEC has designed, developed and manufactured an extensive line of RF/microwave connectors, between-series adapters, RF components and filters for wireless service providers including non-magnetic connectors for quantum computing and MRI equipments etc. ISOTEC's product line includes low-PIM RF connectors components such as power dividers and directional couplers. Off-the-shelf and customized products up to 40 GHz and our low-PIM products can meet -160 dBc with 2 tones and 20 W test. Quick prototyping, advanced in-house testing and high-performance. Designs that are cost effective practical and repeatable.

Thursday 6

The Incredible Ovshinsky Affair

The Incredible Ovshinsky Affair, September 1969 Electronics Illustrated - RF CafeEven with having been granted more than 400 patents in his lifetime, and being a major player in the realms of energy, data storage, and semiconductor research and manufacturing, you - as well as most people - have probably never heard the name Stanford Ovshinsky. He was somewhat of a celebrity in the 1960s and 1970s when working hard to promote his concept of "glassy semiconductors," - aka Ovonic devices. Ovonics are amorphous materials that are used for making switches for digital logic and memory devices. Either the Ovshinsky process did not pan out for high volume commercial production or some other technology displaced the what it was hoped to dominate...

FCC Fines HobbyKing ~$3M for Unauthorized Drone Transmitters

FCC Fines HobbyKing ~$3M for Unauthorized Drone Transmitters - RF Cafe"The FCC has issued a Forfeiture Order (FO) calling for HobbyKing to pay a fine of $2,861,128 for marketing drone transmitters that do not comply with FCC rules. An FCC Enforcement Bureau investigation stemmed in part from a 2017 ARRL complaint that HobbyKing was selling drone transmitters that operated on amateur and non-amateur frequencies, in some instances marketing them as amateur radio equipment. The fine affirms the monetary penalty sought in a June 2018 FCC Notice of Apparent Liability (NAL). The FCC said its investigation found that dozens of devices marketed by the company transmitted in unauthorized radio frequency bands and, in some cases, operated at excessive power levels. 'Such unlawful transmissions could interfere with key government and public safety services, like aviation systems,' the FCC said.'We have fully considered HobbyKing's response to the NAL, which does not contest any facts..."

Electricity in Motion: Current

Electricity in Motion: Current, Basic Navy Training Courses, NAVPERS 10622, Chapter 3 - RF CafeOne of the Notable Tech Quotes which has appeared on RF Cafe is, "The nice thing about standards is that you have so many to choose from," by computer scientist Andrew Tanenbaum. In the middle of the last century, a change in the fundamental understanding of current flow precipitated what has become a very large opportunity for people to misunderstand descriptions of current direction caused by a difference in voltage potential (voltage) - depending on the era a particular description was written. Beginning with Benjamin Franklin, electron current flow was assumed to be from positive to negative, ostensibly but incorrectly, because a positive thing must contain an excess of something (charge carriers - electrons) and a negative thing must have a deficiency. Hence, current flowed from an excess source to a deficient sink. We now know that negative things contain more electrons (relatively) than a positive...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. Chances are you have never used a spreadsheet quite like this. 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...

Overcome Stray Magnetic Fields with Active Field Compensation

Overcome Stray Magnetic Fields with Active Field Compensation - RF Cafe"As the EV market grows, so does demand for robust magnetic field sensors within these vehicles. Stray magnetic fields may diminish the accuracy of these sensors, though, which is where active stray-field compensation comes to the rescue." So begins Frederik Berstecher in his article entitled, Overcome Stray Magnetic Fields with Active Stray-Field Compensation, posted on the Electronic Design website. Continuing, "The electric-vehicle market continues on a serious upswing: Allied Market Research forecasts show it will reach $802.81B by 2027, up from $162.34B in 2019 [can they really estimate to 5 significant digits? - KRB]. Such growth also pushes the need for additional magnetic field sensors within these vehicles for position detection. The sensors are robust enough to withstand a variety of harsh environmental conditions, temperatures, vibrations, and water and dust..."

Withwave Intros Precision SMPM Adapter Series DC to 67 GHz

Withwave Intros Precision SMPM Adapter Series DC to 67 GHz - RF CafeWithwave has announced a new precision SMPM Adapter Series for DC to 67 GHz. These SMPM Series are designed based on precision microwave interconnection technologies up to 67 GHz. These SMPM(F) to SMPM(F) with bullet type and SMPM(M) to SMPM(M) are manufactured to precise microwave specifications and constructed with female and male gender on both sides. The precision microwave connector interfaces ensure an excellent microwave performance up to 67 GHz...

Many Thanks to Berkeley Nucleonics for Continued Support!

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

Wednesday 5

Radio-Electronics Monthly Review

Radio-Electronics Monthly Review, September 1947 Radio-Craft - RF CafeThe "Monthly Review" column appearing in Radio-Craft magazine was an assorted collection of news tidbits about electronics and communications industry happenings, similar to contemporary magazines. Looking back to 1947, the world was hopeful about the future as World War II was finally over and even the loser countries were focusing on how their societies would be shaped by technology and lessons learned in the preceding seven to ten years (depending on when a country entered the war). Two items here are particularly interesting because they refer to ongoing research into large screen televisions and video phones (aka "televisers"). Large screens at the time meant either much bigger cathode ray tubes (CRTs) or projection systems - both of which came to fruition in the 1960s and 1980s, respectively. Plasma screens, then LCD and finally LED screens mark the eventual evolution...

pSemi Expands High-Performance Digital Step Attenuator Portfolio

pSemi Expands Portfolio with Two High-Performance Digital Step Attenuators - RF CafepSemi® Corporation, a Murata company focused on semiconductor integration, announces the expansion of its digital step attenuator (DSA) portfolio with two new high-performance DSAs, PE43610 and PE43614. Featuring industry-leading attenuation accuracy, the PE43610 and PE43614 DSAs support the entire 9 kHz-13 GHz and 9 kHz–45 frequency ranges, respectively. Ideal for 5G test-and-measurement applications, these DSAs exemplify pSemi's high-performance capabilities at mmWave frequencies, maintain monotonic response across the entire frequency range and feature high linearity and fast switching time. Offered in a 24-lead 4x4 mm LGA package, the pSemi PE43610 and PE43614 DSAs feature industry-leading attenuation accuracy, fast switching times, wider frequency band coverage than competitors, and high linearity...

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.

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...

IMS 2009 RF/Microwave Museum Photos

IMS 2009 RF/Microwave Museum Photos (Historical Booth) - RF CafeSince the International Microwave Symposium (IMS 2020) is completely virtual this year, I figured maybe re-posting my coverage of the Microwave Museum display of vintage industry research and development items would fit right in. The photos were taken during my attendance at IMS 2009 in Boston, MA. At the time, they were the only photos of the collection on the WWW. It had a very nice display of items from the early days of radio and radar. According to the IMS 2009 website, the items are "memorabilia from the first IMS held in Boston 50 years ago." Most displays were glass cases, so it made getting useful photographs difficult because of glare and reflections. You will see some of that in the images here. More information can be found on the National Electronics Museum website...

Southwest Antennas Dual-Band Sector Antennas for Multi-Band MIMO and MANET

Southwest Antennas Dual-Band Sector Antennas for Multi-Band MIMO and MANET Communication Networks - RF CafeSouthwest Antennas, a leader in rugged RF and microwave antenna products and accessories for tactical radio systems, is pleased to announce the release of four new dual-band sector antennas designed for use with multi-port MIMO and MANET radio networks. The innovative dual-band sector antenna design allow these antennas to operate across two distinct frequency bands, enabling dual-band transmit and receive capabilities when paired with radio systems capable of multi-band operation. Dual-band operation allows for many advanced network configurations and features, including rapid band-switching for anti-jamming applications in contested RF environments, separating network traffic by band based on environmental operating conditions...

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.

Tuesday 4

TotalTemp Model SCC-98 Thermal Testing System

TotalTemp Technologies Model SCC-98-NR Thermal Testing System - RF CafeTotalTemp Technologies is proud to introduce the SCC98-NR Thermal Platform System. Our newest thermal platform system designed for efficient conductive thermal testing has a 15 x 6.5” active surface. It has fast cooling to -70°C using only electricity, no expendable coolants. Very fast heating to +150°C. System is shown with under bench condensing unit which saves benchtop space. Features award winning Synergy Nano programmable temperature controller and 2−Year Warranty. Alternate sizes, and many custom features available to best meet your requirements. Primary Features & Benefits: Fast temperature transition rates – comparable to some cryogenic systems, Proven, industry standard ultra-low temp refrigeration system...

Tech and Business Related Anagrams

Tech and Business Related Anagrams - RF CafeHow's this for a great anagram? International Microwave Symposium = Comparatively Winsome Ruminations, or maybe Unwise Improvisational Commentary. I came up with that today when noting that IMS 2020 Virtual Event begins today. An anagram, BTW, is a word or words created from the letters of another word or words. Some results are very descriptive of the original subject (Western Union = No Wire Unsent and The Morse Code = Here Come Dots), but the best are results that mock (New York Times = Monkeys Write) or suggest the opposite of the original. Here's another: Electrical Engineer = Career Intelligence. There are many anagram finders out there, including AnagramMaker.com, which is the one I used to find my International Microwave Symposium anagram...

The 4G Decade: Quantifying the Benefits

The 4G Decade: Quantifying the Benefits - RF Cafe"According to a report by Recon Analytics and CTIA, 4G wireless networks powered remarkable economic growth and transformed the way Americans live and work. The study shows the powerful impact of wireless on the economy as American providers begin to rollout next-generation 5G networks, which will create a new 5G economy over the next decade. The report's key findings include that nearly 10% of the GDP increase of the entire U.S. economy from 2011 to 2019 was due to the growth of the U.S. wireless industry, and that U.S. 4G networks support 20 million jobs, drove nearly $700 billion in economic contribution last year alone, and save consumers $130 billion each year..."

Altum RF Products and Expertise at IMS2020 Virtual Conference

Altum RF Showcases Products and Expertise at IMS2020 Virtual Conference - RF CafeJoin Altum RF, a supplier of high performance RF to millimeter-wave semiconductor solutions for next generation markets and applications, at the IMS2020 Virtual Conference. Altum RF will showcase its featured products and technical expertise in its virtual booth. Company leaders will be online to answer questions about specific products, future plans and their decades of expertise designing and delivering RF, microwave and millimeter-wave semiconductors. New products featured in the booth include the ARF1307C7, a 1-20 GHz GaN distributed amplifier that delivers 10 W of saturated output power, and the ARF1010Q4, a 20-30 GHz 1 Watt amplifier for 5G millimeter-wave infrastructure and 24 GHz ISM applications...

The Amazing Collection in Thomas Edison's Garage

The Amazing Collection in Thomas Edison's Garage - RF CafeIf you think electric cars are a new idea, read on. I saw this article, "The Amazing Collection in Thomas Edison's Garage," on another website (the equivalent of Jay Leno's Garage from a century ago) and thought it was a special report, but then I noticed it was actually a paid promotion. So, I contacted the company, B.R. Howard & Associates, Inc., asking for permission to re-post it in its entirety on RF Cafe. They kindly agreed to it. Per their mission statement: "Our company focuses on the conservation of historic artifacts in accordance with the principles defined in the American Institute for Conservation of Historic and Artistic Works Code of Ethics and Guidelines for Practice." Their portfolio of projects include transportation, industrial, scientific, military, and archeological artifacts. An opportunity to help support the preservation effort is provided...

Deep Learning for Radar and Communications Automatic Target Recognition

Deep Learning for Radar and Communications Automatic Target Recognition - RF CafeArtech House today announced the release of Artech House today announced the release Deep Learning for Radar and Communications Automatic Target Recognition by U. Majumder, E. Blasch and D. This exciting resource identifies technical challenges, benefits, and directions of Deep Learning (DL) based object classification using radar data (i.e., Synthetic Aperture Radar/SAR and High range resolution Radar / HRR data). An overview of machine learning (ML) theory to include a history, background primer, and example and performance of ML algorithm (i.e., DL method) on video imagery is provided. Radar data with issues of collection, application, and examples for SAR/HRR data and communication signals analysis is also discussed. Practical considerations of deploying such techniques, including performance evaluation, hardware issues, and the future unresolved issues are presented. Special intro price available for a short time.

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.

Monday 3

Why Tubes Fail Prematurely

Why Tubes Fail Prematurely, September 1958 Radio & TV News - RF CafeAfter reading so many articles about vintage vacuum tube radios and TVs in the older electronics magazines, it makes me appreciate the relatively trouble-free products we enjoy today thanks to semiconductor technology. Monthly columns were filled with troubleshooting advice and tips for making modifications to factory designs that will enhance performance and/or reduce the likelihood of premature failure. Although many tubes did outlast the lifetime of the chassis in which they were installed, it was pretty much a given expectation that sooner or later some tubes would need to be replaced - that is why they were the only components that came installed in sockets for easy removal and installation. Fortunately, because of the huge volumes produced, prices were relatively low, and many stores - not just electronics shops - had self-serve...

Cubesats Close Proximity Operation

Cubesats Close Proximity Operation - RF Cafe"With some technical panache, one of The Aerospace Corporation's CubeSats maneuvered itself within 22 meters of its sibling CubeSat and snapped a series of photos while orbiting at 17,000 miles per hour. This incredibly difficult technology demonstration, performed by a satellite the size of a tissue box, paves the way for future inspection or servicing missions. 'AeroCube-10 is by far the smallest spacecraft to have accomplished a rendezvous and proximity operation so close,' said Catherine Venturini, an Aerospace Senior Project Leader and team lead..."

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

Sponsor RF Cafe for as Little as $40 per Month - RF CafeRF Cafe typically receives 8,000-15,000 website visits each weekday and about half that on weekends. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 13,000 pages in the Google search index, RF Cafe returns in favorable positions on many types of key searches, both for text and images. New content is added on a daily basis, which keeps the major search engines interested enough to spider it multiple times each day. Items added on the homepage often can be found in a Google search within a few hours of being posted. I also re-broadcast homepage items on LinkedIn. If you need your company news to be seen, RF Cafe is the place to be. Advertising begins at $40/month.

Thanks to TotalTemp Technologies for Continued Support!

TotalTemp Technologies - RF CafeTotalTemp Technologies has more than 40 years of combined experience providing thermal platforms. Thermal Platforms are available to provide temperatures between −100°C and +200°C for cryogenic cooling, recirculating circulating coolers, temperature chambers and temperature controllers, thermal range safety controllers, space simulation chambers, hybrid benchtop chambers, custom systems and platforms. Manual and automated configurations for laboratory and production environments. Please contact TotalTemp Technologies today to learn how they can help your project.

Radio Corporation of America Advertisement

Radio Corporation of America (RCA) Advertisement, April 1945 QST - RF CafeMost Ham radio operators know that Franklin D. Roosevelt issued an order during World War II that effectively suspended the hobby of amateur radio for the duration of the war. Many guys sold or donated equipment to the military and/or civil defense organizations out of a sense of patriotism. The Radio Corporation of America (RCA) gave a symbolic tip of the hat to them in this advertisement that I scanned from the back cover of my copy of the April 1945 QST magazine. Of course RCA pitched the ruggedness of its vacuum tubes in the process. By this edition's printing, there was a general sense that the war was nearing an end and eager Hams would not have to wait much longer to re-engage in their beloved hobby. Indeed, the next month Germany surrendered and four months after that Japan surrendered. WWII was over at long last...

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.

Sunday 2

Communications Crossword Puzzle for August 2nd

Communications Crossword Puzzle for August 2, 2020 - RF CafeAugust 2nd's custom Communications Engineering crossword puzzle contains some words particular to radio, radar, analog and digital circuits, components, and other tech-themed words and clues. Each week for two decades I have created a new technology-themed crossword puzzle using only words (1,000s of them) 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...

   
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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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