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Hamvention 2019 - Sunday Roundup

• European Commission to Harmonize 26 GHz Band for 5G Deployments

Sprint, T-Mobile Merger Endorsed by FCC Chairman Pai

KDDI to Launch Pre-5G Services in September 2019

New BT Logo Looks More Like a Warning Than an Invitation

• Samsung Sells 5M A-Series Smartphones in 70 Days, $1B in Sales

• ZTE Works with 40+ Global Operators for 5G Cooperation and Testing

• Can Telcos to Foot the Bill for Boosting Rural Connectivity?

• Analysts Duel on Chip Slump Projections

Electrical Machines - Transformer Action

Some Electrical Machines (Electricity - Basic Navy Training Courses, NAVPERS 10622, Chapter 21) - RF CafeThis line from the Basic Navy Training Courses is very important when considering electrical machines: Many electrical devices and machines operate on the principle of "transformer action." They in fact are not transformers - but the theory of their operation is best explained by considering them as if they were transformers. It is part of chapter 21, entitled, "Some Electrical Machines - Transformer Action," which provides a simple introduction to induction motors and generators, regulators, frequency converters, and synchros. If you are a newcomer to the field of electricity and/or electronics, or if you just want to brush up on old knowledge to be conversant at office parties, this is a great short read. A quiz is provided at the end ...

USAF Deploys Missiles to Fry Weapons with Microwaves

USAF Deploys Missiles to Fry Weapons with Microwaves"The U.S. Air Force has deployed 20 missiles which can zap enemy electronics with powerful pulses rendering weapons virtually useless. They can be launched into enemy airspace at low altitude and emit blasts of high-power microwave energy that immediately disable any devices targeted. The Counter-Electronics High Power Microwave Advanced Missile Project (CHAMP) is the brainchild of Boeing's Phantom Works lab. They have not been operation until now and could be used to frazzle the military defences of Iran and North Korea, reports DailyMail.com. News of the state-of-the-art weapons - which are carried into battle by B-2 stealth bomber ..."

QuinStar Technology: mm-Wave Active & Passive Components

QuinStar Technology mm-Wave Products - RF CafeQuinStar Technology designs and manufactures mm-wave products for communication, scientific, and test applications along with providing microelectronic assembly, rapid prototyping, and mass customization. Amplifiers, Oscillators, Switches, Attenuators, Circulators, Isolators, Filters, Waveguide, Antennas, Phase Shifters, Transceivers, Mixers, Detectors. QuinStar specializes in cryogenic amplifiers, circulators, and isolators. Please visit QuinStar today to see how they can help your project ...

Mac's Service Shop: Simple Things First

Mac's Service Shop: Simple Things First, January 1960 Electronics World - RF CafeAfter many years of reading Mac's Service Shop sagas, a persistent theme seems to be Barney's refusing to refer to equipment schematics while troubleshooting, thereby often wasting valuable time. According to business owner and electronics sage Mac McGregor, assuming that what is typical for most sets will apply to all sets can and does create a fertile environment for frustration - and profit loss. Mac's advice to check "simple things first," has always been my troubleshooting philosophy - maybe because identifying the "hard things" has nearly been my undoing many times when the trouble is not simple. One of first things I do is check switches, connectors, and user-accessible potentiometers for proper operation (when potentially responsible for the problem, of course). I've written many times about how often a dirty connector is the culprit ...

Filter Design with Discrete Elements Made Easy

Nuhertz Filter Design with Discrete Elements Made Easy - RF CafeIf you need to design just about any filter type ever conceived, then Nuhertz Technologies probably has software that can do it. The really big dollar microwave design software suites from Keysight and NI/AWR have synthesis tools, but if you only need to design filters, look no farther. Jeffrey Kahler has an article in MWJ entitled, "Complete Filter Design with Discrete Elements Made Easy," that gives some insight into Nuhertz's capabilities, but you'll want to visit their website to learn of the amazing depth and breadth of filter synthesis tools available. They also have many application notes that might be useful. A free trial and university versions are available ...

Anatech Electronics May 2019 Newsletter

Anatech Electronics May 2019 Newsletter - RF CafeAnatech Electronics, an RF and microwave filter company, has introduced a new line of suspended stripline and waveguide type RF filters. Also, Sam Benzacar wrote as part of his May newsletter an article entitled "Wi-Fi Marches Forward, Unnoticed," which focuses on how advances in Wi-Fi are being made to address contemporary needs, while the news industry and subsequently users are largely unaware of the changes. 802.11ax, rebranded as Wi-Fi 6 by the Wi-Fi Alliance, provides data rate increases up to 37% over 802.11ac. Increased range and higher device connection counts, needed to cover large venues without extenders, is a big part of the performance enhancement ...

Electronic Noise Quiz

Electronic Noise Quiz, August 1962 Popular Electronics - RF CafeOK, class, put your books away and take out a pencil. Spread your chairs out because we're going to have a short test today. A collective sigh permeates the room. Remember those days? I still have nightmares over those moments, and they were decades ago for me. At least this "Electronic Noise Quiz" from the August 1962 edition of Popular Electronics won't affect your GPA. Sometimes PE's quiz illustrations are kind of hard to interpret, but this one does a pretty good job (except item 'E', but I'm not telling what it is since nobody helped me). You will need a fairly diverse background in consumer type electronics to do well, and having a few gray hairs will probably help as well. Good luck. BTW, my score was a somewhat embarrassing 80% ...

Elon Musk Shows off 60 Starlink Satellites Packed into Falcon Rocket - RF Cafe"SpaceX CEO Elon Musk tweeted out a picture of 60 of SpaceX's secret Starlink satellites packed into a Falcon rocket, ready to be launched this week in the first major test deployment of SpaceX's satellite-based internet intrastructure. Starlink Satellites Ready for Launch On Twitter this week, Elon Musk showed off 60 of SpaceX's new Starlink satellites being packed onto a Falcon rocket in advance of this week's mission to test the deployment of the satellites into low Earth orbit. In a series of tweets, Elon Musk showed off the satellites along with a similar picture of SpaceX's Starman just prior to its launch into space ..."

KR Electronics: RF & Microwave Filters

KR ElectronicsKR Electronics designs and manufactures high quality filters for both the commercial and military markets. KR Electronics' line of filters includes lowpass, highpass, bandpass, bandstop and individually synthesized filters for special applications - both commercial and military. State of the art computer synthesis, analysis and test methods are used to meet the most challenging specifications. All common connector types and package form factors are available. Please visit their website today to see how they might be of assistance ...

Recent Developments in Electronics

Recent Developments in Electronics, January 1960 Electronics World - RF CafeThis "Recent Developments in Electronics" from a 1960 issue of Electronics World had a lot of antenna news that included a retarded surface wave antenna with high gain and low silhouette for use in airborne early warning radar as well as ground based and shipboard radar, a pair of 60-foot tropospheric scatter antennas that are specially mounted at opposite ends of a 180-mile long section of the Gulf of Mexico, and a 104-foot-long rotating 50-ton radar antenna used for the SAGE early warning system. Also reported was Westinghouse Electric's airborne Stratovision for broadcasting educational television programming to rural areas out of reach of existing towers ...

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

Empower RF SystemsEmpower 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 ...

Extraordinarily Transparent Compact Metallic Metamaterials

Extraordinarily Transparent Compact Metallic Metamaterials - RF CafeAny Star Trek fan would immediately recognize this as Mr. Scott's "transparent aluminum." "In materials science, achromatic optical components can be designed with high transparency and low dispersion. Materials scientists have shown that although metals are highly opaque, densely packed arrays of metallic nanoparticles with more than 75% metal by volume can become more transparent to infrared radiation than dielectrics such as germanium. Such arrays can form effective dielectrics that are virtually dispersion-free across ultra-broadband ranges of wavelengths to engineer a variety of next-generation metamaterial-based optical devices ..."

Pop'tronics Comic Strip

Pop-tronics Comic Strip, November 1957 Popular Electronics - RF CafeThe 1950s was a time when futurists were predicting that domestic robots would be common place items in households. By the turn of the century, mankind, freed from the drudgery of manual labor, would have plenty of time for recreating, resting, and sitting around brainstorming the next big thing. Here it is 12 years into the new century and at the most, a fraction of a percent of the population even has a Vroom robotic floor vacuum - and it looks nothing like a human. This comic from the November 1957 Popular Electronics exemplifies the visions of the last century. Now, maybe by the end of the 21st century we'll finally be ...

Rohde & Schwarz: This Changes Everything!

Rohde & Schwarz: This Changes Everything! - RF CafeRohde & Schwarz introduces their "This Changes Everything" promotion which allows customers to purchase its oscilloscopes, spectrum analyzers, power supplies and power analyzers each fully equipped with the maximum bandwidth, channels, inputs, memory interfaces and signal generation for one affordable, unrivaled price. The promotion runs May 20 through December 31, 2019. Customers who might need to budget for future upgrades based on design needs can maximize their investment up front, making purchasing easier and less expensive. Save up to $10,000 on full-solution instruments. Gone are the days of keycode upgrades ...

Fighter Jets with Missile-Killing Lasers

Fighter Jets with Missile-Killing Lasers - RF Cafe"U.S. Air Force says a ground-based laser downed multiple test missiles over New Mexico. A successful ground test has moved the U.S. military one big step closer to putting anti-missile lasers on its aircraft. A ground-based laser shot down 'several' missiles in flight during an April 23 test at the White Sands Missile Range in New Mexico, Air Force officials said. Run by the Air Force Research Laboratory, or AFRL, the test was part of the Self-Protect High Energy Laser Demonstrator, or SHiELD, a program intended to protect aircraft from incoming missiles. AFRL officials said security reasons prevented them from saying how many missiles were downed in the test. The laser that the Air Force lab used for the test was ground-based ..."

Innovative Power Products: RF & Microwave Passive Components

Innovative Power ProductsInnovative Power Products (IPP) has over 30 years of experience designing & manufacturing RF & microwave passive components. Their high power, broadband couplers, combiners, resistors, baluns, terminations and attenuators are fabricated using the latest materials and design tools available, resulting in unrivaled product performance. Applications in military, medical, industrial and commercial markets. Take a couple minutes to visit their website and see how IPP can help you today ...

Sansui TA−300 Integrated Tuner Amplifier

Sansui TA-300 Integrated Tuner Amplifier - RF CafeSometime around 1980, while stationed at Robins AFB, Georgia, I finally succumbed to the peer pressure of other more sophisticated audiophiles in the barracks and bought a "real" stereo. Unlike my roommate who had a full compliment of rack-mounted gear, my meager enlisted military pay only allowed for a mid-grade instrument. The solution was a Sansui TA−300 Integrated Tuner Amplifier. It put out a whopping 30 watts per channel, but unlike my existing radio (a Readers Digest 800−XR), those 30 watts were nearly distortion free when driving good speakers. Having only the pathetic 5 W speakers that came with the 800-XR, I designed a set of speakers rated for 60 W, and built the enclosures myself in the base woodshop. Unfortunately, in preparation for a household move about 20 years ago, I sold the Sansui and the speakers ...

How Many Microhenrys in That Coil?

How Many Microhenrys in That Coil?, December 1931/January 1932 Short Wave Craft - RF CafeThis is a nice short article covering the calculation of inductances for coils wound on cores and wire sizes. It appeared in a 1932 issue of Short Wave Craft, but of course inductance has not changed since then so it is still relevant. The author recognized that standard formulas, although concise and accurate, are sometimes difficult to work with when calculations for a large number of values is needed for a particular circuit design. To address the situation, he presents a handy nomograph, chart, and a table of typical values. He also introduces a rarely seen term "Nagaoka's correction factor*" for skin effect. A smartphone app, a spreadsheet, or a desktop computer program would be used today to calculate inductance ...

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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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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