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Shortages Threaten Electronics Supply Chain

Balloons with APRS Payloads to Race Across America in Educational Challenge

AT&T to Deploy DSS in 2nd Half of 2020

U.S. Opens 6 GHz Band for Wi-Fi

• 5G Communication to Revolutionize Industrial Internet of Things (IIoT)

• DARPA Selects Teams to Increase Security of Semiconductor Supply Chain

Radar Industry to Show Steady Growth Through 2025

• UK D10 Plan to Provide Alternatives to Huawei

What Is a Space Weapon, and Who Has Them?

How an Electronic Brain Works

How an Electronic Brain Works, June 1951 Radio-Electronics - RF CafeThis is another example of a multi-part article of which I happen to have discovered only one of installments - Part 9. As is often the case, each article is pretty much stand-alone and does not require that you have already seen the previous sections. In 1951, computers were still mostly analog; digital circuits were just beginning to get serious research thanks to the recent advent of solid state devices. Boolean algebra, truth tables, and combinational logic were just beginning to be taught in engineering courses. ENIAC (Electronic Numerical Integrator and Computer), first used in 1945 at the end of World War II, was the world's first general purpose digital computer, and its active elements were vacuum tubes - about 20,000 of them. As you might expect, there was a lot of excitement in the electronics, scientific, and finance world about digital computers that would be inexpensive enough that individual corporations...

Radio WittiQuiz

Radio Wittiquiz, December 1937 Radio-Craft - RF CafeRadio-Craft magazine solicited inputs from its readers for a series of 'WittiQuiz' questions and answers related to radio and electronics, with a stipulation being that there had to be some aspect of humor included. That meant that some of the multiple choice answer options needed to be inane. For most of the questions, the process of elimination is pretty easy, but a couple could cause some head scratching - especially if you are not really sure of the answer. This group starts at number 28, so obviously preceding issues had questions 1 through 27. At some point I will probably acquire them and post other WittiQuizzes.

Please Visit Triad RF Systems to Thank Them for Their Support

Triad RF SystemsTriad RF Systems designs and manufactures RF power amplifiers and systems. Triad RF Systems comprises three partners (hence 'Triad') with over 40 years of accumulated knowledge of what is required to design, manufacture, market, sell and service RF/Microwave amplifiers and amplifier systems. PA, LNA, bi-directional, and frequency translating amplifiers are available, in formats including tower mount, benchtop, rack mount, and chassis mount. "We view Triad more as a technology partner than a vendor for our line-of-sight communications product line." Please check to see how they can help your project.

Atwater Kent Model 649 All-Wave 9 Metal Tube Superhet. Radio

Atwater Kent Model 649 All-Wave 9 Metal Tube Superhet. Radio Service Data Sheet, November 1935 Radio-Craft - RF CafeFor more than a decade, I have been posting these Radio Service Data Sheets for radios and various other audio and visual electronics sets that appeared in vintage electronics magazines. This one for the Atwater Kent Model 649 all-wave, 9 metal tube, superheterodyne console radio set was published in the November 1935 issue of Radio Craft. "All-Wave" radios were popular at the time because they provided access to shortwave bands so listeners could tune in foreign broadband stations - often with the rudimentary built-in antenna. Short Wave Listening was actually a worldwide sport that had its own cadre of enthusiastic participants, including a dedicated magazine entitled Short Wave Listener. Although not as popular today, there are still a few adherents remaining today.

How to Soup up Your Home WiFi

How to Soup up Your Home WiFi - RF Cafe"Does flaky Internet connectivity have you scrounging for solutions? The COVID-19 pandemic increased our demand for Internet service due to working from home, online learning for kids, and video conferencing with colleagues and family members. For many people stuck at home, Internet connectivity issues became more troublesome in recent months. To make matters worse, Internet providers may be unwilling to send repair techs into your home to fix your problems. Construction materials and interior design decisions can have an adverse effect on how far your WiFi signal travels inside. They can slow down the connection speed, especially when everyone is home using a slew of computing devices. Put this do-it-yourself primer to work fixing what ails your home network..."

Copper Mountain Technologies: Vector Network Analyzers

Copper Mountain TechnologiesCopper Mountain Technologies develops innovative and robust RF test and measurement solutions for engineers all over the world. Copper Mountain's extensive line of unique form factor Vector Network Analyzers include an RF measurement module and a software application which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware via USB interface. The result is a lower cost, faster, more effective test process that fits into the modern workspace in lab, production, field and secure testing environments.

Electronics-Themed Comics, 1954 Radio & Television News

Electronics-Themed Comics, April and September 1954 Radio & Television News - RF CafeToday has been a busy day, so a couple electronics-themed comics from issues of vintage Radio & Television News magazines help to relieve the stress a bit. I could never figure out why these comics were buried deep inside most issues at the ends of article continuations. These two were on pages 88 and 93. The top one is meant to demonstrate just how obsessed the public was with the relatively new television phenomenon - just look at what they chose to ignore on the display TV in order to get a peek at the inside workings of a television set. The other comic, while clever in its intent, would never pass editorial muster in today's world because of the great hazard it represents. Enjoy.

Navy Inks Deal for Synthetic Aperture Radar

Navy Inks Deal for Synthetic Aperture Radar - RF Cafe"Capella Space announced May 13 that it signed a deal to provide synthetic aperture radar to the U.S. Navy, even though the company has yet to put a satellite on orbit. Unlike traditional electro-optical satellite imagery, which can be degraded or denied by adverse lighting conditions or weather, SAR creates images with radar, meaning it can produce images regardless of the weather or lighting conditions. Additionally, SAR sensors can provide data on material properties, moisture content, precise movements, and elevation, meaning that SAR can be used to build 3D recreations of a given geographical area. Capella says its planned SAR satellite constellation will be able to collect sub-0.5 meter imagery, capable of identifying various types of aircraft or vehicles at ground level..."

Carl Kohler: Thin Air My Foot!

Carl Kohler: Thin Air My Foot!, July 1956 Popular Electronics - RF CafeWhilst reading this Carl Kohler technodrama entitled "Thin Air My Foot!," I happened upon this word new to me: 'din,' as in "It was dinned into me." OK, maybe you already knew that, but surely I should have been aware of its alternate meaning other than being a loud noise ("the agitated cat made quite a din."). Fortunately, I am not subject to a household of people who refuse to put things back in their respective places when through with them, but this tale of woe tells what might be a familiar scenario to you. To be honest, this could have been written about me as a boy - before the U.S. Air Force taught me a thing or two about organization and neatness - since I continually frustrated my father by leaving his tools (and hardware and lumber and paint) scattered in forgotten places around the house and yard...

Many Thanks to Axiom Test Equipment 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!

Free General-Purpose Scientific and Engineering Plotting Library w/Smith Chart

DISLIN Scientific and Engineering Plotting Library w/Smith Chart - RF Cafe Cool ProductDr. Scott Best, of SiberSci RF engineering services, sent information about the FREE general purpose DISLIN scientific and engineering plotting software library that includes Smith Chart support. The graphics library was initially created at the Max Planck Institute for Solar System Research beginning in 1985 by Mr. Helmut Michels. Its continual series of upgrades is as recent as May 2020. The DISLIN library is available for Unix, Linux, FreeBSD, Windows, Mac OSX, and MS-DOS systems. It supports a variety of public domain and commercial compilers for Go, Perl, Python, Java, Ruby, TCL, Julia, FreeBASIC, Free Pascal, R, C/C++, and Fortran (77, 90, and 95). If you are a software developer, you probably know that most development platforms are supplied with either no plotting components or very rudimentary versions of for-purchase products. Many cost hundreds or even thousands of dollars...

Triad RF Systems Low-Cost Amplified S-Band Radio for Long-Range Links

Triad RF Systems Low-Cost Amplified S-Band Radio for Long-Range Links from a COTs Microhard pMDDL2450 PicoRadio - RF CafeTriad RF Systems, continues to add to its THPR series of ready-to-install amplified radios. Eliminating the need to integrate standalone components to create a long-range wireless and intelligence, surveillance, and reconnaissance (ISR) radio links working in S-band, Triad has combined high power RF subsystems with a Microhard pMDDL2450 core radio that operates from 2402 - 2482 MHz. Triad model THPR1006 is an efficiently packaged, highly reliable, dual-channel MIMO, turnkey radio system that includes bi-directional amplifiers (BDAs), RF filtering, and optional real-time power measurements, link diagnostics, and innovative SoC-based monitoring and controls. This integrated amplified radio system delivers maximum power output of 40 W at ~5 Mbps on its max power setting, and 10 W at ~20 Mbps on its max data rate setting. Unmanned system engineers can expect...

everythingRF: Their Name Says It All

everything RF Searchable Database - RF CafePlease take a few moments to visit the everythingRF website to see how they can assist you with your project. everythingRF is a product discovery platform for RF and microwave products and services. They currently have 267,269  products from more than 1397 companies across 314 categories in their database and enable engineers to search for them using their customized parametric search tool. Amplifiers, test equipment, power couplers and dividers, coaxial connectors, waveguide, antennas, filters, mixers, power supplies, and everything else. Please visit everythingRF today to see how they can help you.

Radio & Science Crossword Puzzle for May 31st

Radio & Science Crossword Puzzle May 31, 2020 - RF CafeThis week's crossword puzzle is a new type that uses a "free form" layout where the software dynamically creates the word grid, rather than beginning with a predefined grid that it then fills with words. It appears the longer it is allowed to run, the greater the number of words and cross-links it creates. After about 5 minutes, this 19x17 grid is showing 57 words and 61 cross-links... and now an hour later it shows 62 words and 70 cross-links - not overly impressive in my view. The algorithm picks from the same database of thousands of words which I have been creating for over twenty years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, familiar company names etc. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska...

Mac's Service Shop: Electrostatics at Work

Mac's Service Shop: Electrostatics at Work, February 1973 Popular Electronics - RF CafeElectronics wizard, repairman, and experimenter extraordinaire Mac McGregor, as sort of alter ego of author John T. Frye, provides a brief lesson on electrostatics for his repair shop apprentice wing man Barney (I don't think his last name was ever mentioned). In this 1973 Popular Electronics magazine article, Mac had built two types of electroscopes - one using a pair of pith balls suspended from silk strings and another that was a cobbled-together version of a gold leaf electroscope. His motive was two-fold. First and foremost was to accommodate his own interest in electrostatics, and second to hopefully engender enough curiosity in Barney to cause him to do a dive into science books to learn more. Given the potentially lethal levels of electrostatic charge that builds on TV picture tubes they worked around, gaining a healthy respect for an electrostatic charge...

CEA-Leti Explore 6G Technology Roadmap in mm-Wave Bands

CEA-Leti Explore 6G Technology Roadmap in mm-Wave Bands - RF Cafe"As countries around the world begin rolling out 5G wireless networks, CEA-Leti, a technology research institute, is looking ahead to 6G technologies that will surpass the data-transfer capability of 5G. The wireless communication in mm-Wave bands, ranging from 20 to 300 GHz, is expected to be a key enabling technology for 6G wireless systems. This is because of the huge available bandwidth that can accommodate ultra-high data-rate communications. Within that range of mmWave bands, CEA-Leti's research is investigating D-band, a new spectrum at 140 GHz that may play a major role in 6G wireless communication. In a paper written for the 6G Wireless Summit, which was scheduled to take place in March but got cancelled because of the coronavirus pandemic, CEA-Leti, and Siradel, a French engineering... "

Frequency Modulation Fundamentals

Frequency Modulation Fundamentals, August 1939 QST - RFCafeFrequency modulation (FM) was, is, and always shall be: x(t) = Xc·cos [Ωct + β·sin (Ωmt)], where the carrier is xc(t) = Xc·cos (Ωct), and the modulating signal is xm(t) = β·sin (Ωmt). Yea verily, thus sayeth Edwin H. Armstrong. Amen, brothers and sisters of radio. The methods for generating and degenerating[sic] FM might vary, but the fundamentals do not vary. Mr. Armstrong developed and patented his system of frequency modulation in the late 1920s and early 1930s, so when this article appeared in QST in 1939, FM was still fairly new - or even unknown - to most people. Household radio dials still had only markings for the commercial AM band (520 - 1720 kHz) and, in a few cases, a couple shortwave bands (also AM)...

Microwave Filters, Impedance-Matching Networks, and Coupling Structures

Microwave Filters, Impedance-Matching Networks, and Coupling Structures - RF Cafe"Microwave Filters, Impedance-Matching Networks, and Coupling Structures," by Matthaei, Young, and Jones, is another classic text that was a go-to reference for filter designers before desktop synthesis software was commonplace. It is also available on the Archive.org website - all 1,115 pages of it. While you are at Archive.org, do a search on any topic of interest and likely you will receive more sources than you ever dreamed were available on the Internet. That includes books, technical reports, white papers, magazine articles, videos, audios, music, podcasts, and other media formats. It is truly a unique and indispensible repository of information. The WayBack Machine has been capturing website pages for more than two decades. It has collected pages from RFCafe.com during 888 sessions between October 13, 1999 and May 13, 2020.

Qorvo / Custom MMIC Eliminating Mixup over Mixers - RF Cafe PCB Directory (Design)
Exodus Advanced Communications - RF Cafe Res-Net Microwave - RF Cafe
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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 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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