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"Any time the voltage 'over here' is different than the voltage 'over there,' current will flow. " - H. Ward Silver, N0AX

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

• FCC Proposes to Make All Universal Licensing System Filings Electronic

• 4 Reasons Why Someone Would Hack Your Car

China Cuts Back on Foreign Investment

• Six Reasons COBOL Has Survived to Age 60

Q2 Semi Inventory Was 93 Days

IMS 2020 is Now Open for Paper Submissions!

• FCC Moves Toward June 2020 CBRS Spectrum Auction

• Lawsuit Alleges T-Mobile Sold Used Phones as New

Electric Car Sales Subsidy to Be Abolished 

1992 Honda Radio Teardown

1992 Honda Radio Teardown - RF CafeYou know you're old when a 1992 car radio does not seem like it should qualify as a vintage electronics. Electronic Design's Paul Rako has posted his findings when investigation a failed AM/FM radio from his 1992 Honda car. "The radio in my 1992 Honda started acting up a decade ago. The display went out first. Pressing or hitting the front panel brought it back, at least for a while. Then the tuner was intermittent, no matter if the display was working. Four years ago, the radio really broke. It would not play at all; worse yet, there would be loud RF squealing in the speakers, even with the radio turned off. I assumed this was from a blown output section that was receiving electromagnetic interference (EMI), which the blown transistors would rectify and detect ..."

Reactel: RF & Microwave Filters of All Types

Reactel Filters - RF Cafe

Reactel has become one of the industry leaders in the design and manufacture of RF and microwave filters, diplexers, and sub-assemblies. Through a continuous process of research and development, they have established a full line of filters of filters of all types - lowpass, highpass, bandpass, bandstop, diplexer, and more. They offer the generally known tubular, LC, cavity, and waveguide designs, as well as state of the art high performance suspended substrate models. Established in 1979. Please contact Reactel today to see how they might help your project.

Engineering & Technical Headlines Crossword Puzzle for September 15

Engineering & Technical Headlines Crossword Puzzle September 15, 2019 - RF CafeThis RF Cafe Engineering & Technical Headlines Crossword Puzzle contains at least 10 words from headlines posted on the homepage during the week of September 9 through September 13, 2019 (marked with an asterisk*). These custom-made engineering and science-themed crossword puzzles are done weekly for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. Every word and clue - without exception - in these RF Cafe puzzles has been personally entered into a very large database that encompasses engineering, science, physical, astronomy, mathematics, chemistry, etc. Let me know if you would like a custom crossword puzzle built for your company, school, club, etc. (no charge).

A Primer on Single Sideband

A Primer on Single Sideband, September 1974 Popular Electronics - RF CafeSingle-sideband (SSB) modulation was a big deal when it was first introduced at a time when the radio spectrum was getting pretty crowded - particularly in the commercial broadcast bands. It allowed more channels / stations to be packed into available space, which was obviously a good thing, but the other main benefit of SSB is the transmission efficiency - especially when a suppressed carrier format is used. At really high powers, electronic components, antennas, cabling, and facilities are very expensive, so being able to broadcast a signal over a given distance at a lower power represents a cost savings. As the old saying goes, though, "there is no free lunch." Modulators in transmitters ...

Get a Charge out of Device Capacitance-Voltage Testing

Get a Charge Out of Device Capacitance-Voltage Testing - RF CafeAxiom Test Equipment has posted a new blog entry entitled, "Get a Charge Out of Device Capacitance-Voltage Testing." Read their latest blog to learn what to look for when selecting test equipment for semiconductor device capacitance-voltage (C-V) measurements and learn how C-V measurements can greatly assist the modeling and design of circuits with semiconductor devices. "Transistors and integrated circuits (ICs) make many of our modern electronic 'toys,' such as cellular telephones and computers, possible. But before it is possible to reliably design supporting circuits for new semiconductor devices, they must be accurately tested to better understand their electrical characteristics. Last month's blog looked at the ways in which current changed with changing voltage. As a follow-up, this blog will explore capacitance ...

AC Calculations for Parallel and Series-Parallel Circuits

A.C. Calculations for Parallel and Series-Parallel Circuits, June 1944 QST - RF CafeWhen you read a lot of tutorials about introductory electronics on the Internet, most are the same format where stoic, scholarly presentations of the facts are given. Those of you who don't have enough fingers and toes to count all of the college textbooks like that which you have read know of what I speak. When hobby articles are written in a similar fashion, it can quickly discourage the neophyte tinkerer or maybe even a future Bob Pease. The ARRL's QST magazine has printed a plethora of articles over the years that are more of a story than just a presentation of the facts. My guess is the reason is because often the authors are not university professors who have forgotten how to speak to beginners. This article on basic calculations for AC series and parallel circuits is a prime example ...

World's First Wireless Charger with 16 Charging Coils

World's First Wireless Charger with 16 Charging Coils - RF Cafe"Have you ever accidentally misplaced your phone on a wireless charger and consequently woken up with a phone that has an almost empty battery? ZENS, a wireless charging expert has solved this problem with the launch of ZENS Liberty - a wireless charger with 16 overlapping charging coils. The 16 coils will give complete freedom of placement, allowing you to place two devices anywhere on the charging pad. So far, existing wireless chargers only have a few charging coils and your device needs to be placed on a specific spot on the charging pad. ZENS will launch two variations of the 16-coil wireless charger ..."

Electro-Photonics Offering RF & Microwave Products

Electro-PhotonicsElectro-Photonics is a global supplier of RF & Microwave components. Their products include SMT hybrid and directional couplers, wire bondable passive components, mounting tabs, filters, transmission lines, and very useful test boards for evaluating components (spiral inductors, single-layer capacitors). The Electro-Photonics team can support your small R&D design requirements with RF & Microwave test fixtures and save you valuable design and characterization time. Please take a moment to visit Electro-Photonics' website and see how your project might benefit.

The Hi-Fi Power Rating Hassle

The Hi-Fi Power Rating Hassle, October 1972 Popular Electronics - RF CafePresident Ronald Reagan once stated that the nine most terrifying words of the English language were, "I'm from the government and I'm here to help." I share the sentiment generally while acknowledging that there are some areas where government oversight and regulation is needed. Problems arise where the opinions and beliefs of a self-appointed group of "experts" are allowed to impose subjective standards toward the creation of objective standards. Such was the case in the 1970s when the FTC sought to publish a set of rules by which high fidelity (hi−fi) stereo equipment manufacturers must publish performance parameters. The EIA had their own ideas for how equipment specs should be reported. Popular Electronics magazine published hundreds of product reviews for receivers, recording and playback devices, power amplifiers, equalizers, speakers ...

Nikola Tesla - Master of Lightning

Nikola Tesla - Master of Lightning - RF CafeI ran across this full-length video of the documentary titled, "Nikola Tesla - Master of Lightning," which was aired by PBS in 2000. It is the most extensive visual resource of information on Tesla that I have seen. Most people, if they have ever even heard of Nikola Tesla, associate him with gigantic high voltage generators making his hair stand on end, but his contributions to the world of electricity go far beyond that. Aside from the lightning machines, he also developed almost single-handedly the basic concept of alternating current (AC) power generation, distribution, and motors. The battle, both personally and corporately, with Thomas Edison and his proposed direct current (DC) system is epic and tragic. Documentaries like this one tend to flourish the tale a bit with exaggerations that build sympathy for the featured good guy du jour ...

Custom MMIC Intros Low Noise Amplifiers for 2-16 GHz

Custom MMIC Intros Low Noise Amplifiers for 2-16 GHz - RF CafeCustom MMIC, a leading designer and manufacturer of high performance monolithic microwave integrated circuits (MMICs), is proud to introduce three new Low Noise Amplifier (LNA) MMICs to its industry leading portfolio of high-performance RF and Microwave MMIC products. These three new GaAs devices offer customers a broad frequency range that addresses many popular wireless applications in the Aerospace, Defense and Instrumentation markets. The CMD308P4 is a broadband MMIC low noise amplifier housed in a leadless 4x4 mm plastic surface mount QFN package. The device operates from 2 to 6 GHz and delivers 31 dB of gain with a corresponding output 1 dB compression point of +12 dBm and a noise figure of 1.6 dB. The CMD308P4 includes on chip blocking capacitors and is internally matched to 50 ohms which eliminates ...

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

Engineering Job Board - R 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 (of course a gratuity will be graciously accepted). 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 ...

Electronics and the International Geophysical Year

Electronics and IGY, March 1958 Popular Electronics - RF Cafe"The International Geophysical Year (IGY) was an international scientific project that lasted from July 1, 1957, to December 31, 1958. It marked the end, after Joseph Stalin's death, of a long period during the Cold War when scientific interchange between East and West was seriously interrupted. As many as 67 countries participated among which were all major ones with the exception of mainland China. The IGY encompassed eleven Earth sciences: aurora and airglow, cosmic rays, geomagnetism, gravity, ionospheric physics, longitude and latitude determinations (precision mapping), meteorology, oceanography, seismology and solar activity. Both the U.S. and the Soviet Union (USSR) launched artificial satellites ...

Navy's New Radar For Nimitz Class Carriers and Amphibious Assault Ships

Navy's New Radar For Nimitz Class Carriers and Amphibious Assault Ships - RF Cafe"A new generation of advanced and highly capable modular radar systems is going to be deployed across the Navy's fleet in many configurations. A staple feature on Nimitz class supercarriers and America's 'Gator Navy' of amphibious assault ships may begin to disappear in the not so distant future and in its place will be a very different looking system. The AN/SPS-48 three-dimensional air-search radar has been fielded across the Navy for over five decades. Today, a modernized version - the AN/SPS-48G - of the big, square, billboard-like, spinning array can still be found on Nimitz class carriers, San Antonio class landing platform docks, and Wasp and America class amphibious assault ships. But that is slated to slowly change ..."

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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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