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"Communications do not just grow; they are planned." -- Brigadier General Wesley T. Guest

Today in Science History

Oscilloscope Patterns and Amplifier Diagnosis

Oscilloscope Patterns and Amplifier Diagnosis, October 1953 Radio-Electronics - RF CafeAn ability to interpret the display on an oscilloscope is absolutely essential to efficiently diagnose a circuit when troubleshooting. In the days of an electronics repair shop in every town when televisions, radios, phonographs, tape recorders, and other consumer gizmos were actually meant to be repaired rather than thrown away and replaced, technicians needed to be able to compare a measured signal to the one represented in the factory service manual, or what was known from experience to be the expected signal. Especially with TV where complex analog broadcast signals were decoded and routed to circuits for stereo audio, red, green and blue color channels, scan synchronizations, and other functions, phase shifts and signal distortion caused by any number of component failures or parameter changes could be very difficult to troubleshoot. If you have read some of the "Mac's Radio Service Shop" episodes...

Anode Allows for Safe Battery Recharge in Minutes

Anode Allows for Safe Battery Recharge in Minutes - RF Cafe"Researchers at UC San Diego may have found a solution that enables lithium-ion batteries to be safely recharged within minutes for thousands of cycles. Quick battery recharge is something scientists are constantly working on as people get more and more dependent on their electronic devices. Now researchers at UC San Diego may have found a solution in a new anode material that enables lithium-ion batteries to be safely recharged within minutes for thousands of cycles. The material is a disordered rock salt, which is comprised of earth-abundant lithium, vanadium, and oxygen atoms..."

A Radioman's Nightmare

A Radioman's Nightmare, March 1945 QST - RF CafeJust in time for Halloween: "A Radioman's Nightmare" - another sampling of electronics poetry, circa 1945... BTW, for those unfamiliar with "Mairzy Doats," the song is a comical slurring of words that make new, nonsensical words in the process. 'Mairzy Doats', for instance, is a slurring of 'Mares Eat Oats,' 'And Liddle Lamzy Divey' is really 'And Little Lambs Eat Ivy." "Mairzy Doats" was written in 1943...

AWR Software V15 Playlist on AWR.TV YouTube Channel

New AWR Software V15 Playlist Now Available for Viewing on AWR.TV YouTube Channel - RF CafeA new AWR.TV video playlist features seven videos that enable users to take a deep dive into the key features in the V15 release of Cadence® AWR Design Environment® software. The V15 videos highlight: New and improved antenna measurements for peak power, including direction, total power, and amount of power radiated in peak direction. Driving circuitry in calculations can also be included. New electromagnetic (EM) features in the AWR® AXIEM® and Analyst™ simulators. AXIEM software offers improved meshing with fewer high-aspect ratio facets (HARFs), a true DC solver for biasing that is 40X faster and sub nanometer meshing for metal-insulator-metal (MIM) capacitors...

Many Thanks to Nova Microwave for Continuing Support!

Nova Microwave Circulators & Isolators - RF CafeNova Microwave is a leader in technically differentiated electronic and radio frequency Ferrite Circulators and Isolators that connect, protect and control critical commercial and military wireless telecommunications systems. Our staff is dedicated to research and development of standard and custom design quality Ferrite Circulators and Isolators from 380 MHz to 26.5 GHz. Available in single or multi-junction topographies, the Nova Microwave product line of is specifically designed for use in varied environmental and temperature extremes. 

A New Memory Device

A New Memory Device, October 1953 Radio-Electronics - RF CafeRadio-Electronics magazine ran a regular industry news column entitled "The Radio Month." The headline item in the December 1949 issue was the emergence of a new type of digital memory device using nearly microscopic magnetic toroidal coils with a matrix of even tinier wires threaded through them in order to write and read 1's and 0's. RCA created this 10,000-bit magnetic core memory assembly in order to overcome the size and speed limitations of alternate methods available in the day - primarily mercury-based delay lines. UNIVAC II, commissioned in 1958, was the first major digital electronic computer to use this magnetic core memory, but given that transistor development was still in its infancy, vacuum tubes were used to address...

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...

U.S. Space Development Agency Awarded Contracts for 1st Gen Tracking Layer

U.S. Space Development Agency Awarded Contracts for 1st Gen Tracking Layer - RF Cafe"SDA announced October 5 two contract awards for the first generation of the Tracking Layer. These awards represent the next major and highly visible steps toward developing the National Defense Space Architecture's inaugural tranche (called Tranche 0). Once fully operational, the SDA Tracking Layer will consist of a proliferated heterogeneous constellation of Wide Field of View (WFOV) space vehicles (SVs) that provide persistent global coverage and custody capability combined with the Missile Defense Agency (MDA) Hypersonic and Ballistic Tracking Space Sensor (HBTSS) Medium Field of View (MFOV) SVs that provide precision global access capability. This set of contract awards will initiate the development of the first eight low-cost proliferated WFOV SVs..."

After Class: Working with Phase-Shift Oscillators

After Class: Working with Phase-Shift Oscillators, December 1958 Popular Electronics - RFCafeThere is an old adage that goes thusly: "If you want to build an oscillator, design an amplifier. If you want to build an amplifier, design an oscillator." Its basis is the difficulty that can be experienced in obtaining the right combination of feedback phase and amplitude. Of course experience, use of simulators, and careful circuit construction minimize the opportunity for validating that saying. The basic requirement for an oscillator is feedback from the output to the input that is in-phase and great enough in amplitude to maintain, via the amplifier's gain factor, a constant output level. Tuned L-C (inductor-capacitor) tank circuits are often used as simple frequency-determining elements because of their combined resonance characteristics. Phase shift oscillators are a type of oscillator that can be built without inductors...

Teledyne e2v HiRel and Silicon Labs Partner on Isolation

Teledyne e2v HiRel and Silicon Labs Partner on High Reliability Isolation - RF CafeSilicon Labs, a leading provider of silicon, software and solutions, today announced a new high reliability (HiRel) isolation partnership with Teledyne e2v HiRel, a leading provider of high-performance, high-reliability semiconductors to the aerospace and defense market. Under the new agreement, Teledyne will offer a new specialized line of high reliability products based on Silicon Labs' isolated gate driver technology optimized for space, aerospace, military and oil and gas markets. Teledyne e2v HiRel will market custom high reliability solutions based on Silicon Labs' Si827x isolated gate driver family that are optimized for space, aerospace, military, oil and gas and other markets requiring advanced technology and high reliability...

Please Thank Anatech Electronics for Their Long-Time Support!

Anatech Electronics logo - RF CafeAnatech Electronics (AEI) manufactures and supplies RF and microwave filters for military and commercial communication systems, providing standard LP, HP, BP, BS, notch, diplexer, and custom RF filters, and RF products. Standard RF filter and cable assembly products are published in our website database for ease of procurement. Custom RF filters designs are used when a standard cannot be found, or the requirements dictate a custom approach for your military and commercial communications needs. Sam Benzacar's monthly newsletters address contemporary wireless subjects. Please visit Anatech today to see how they can help your project succeed. 

Weather Detection Radar

Weather Detection Radar, October 1955 Radio & Television News - RF CafeRCA (Radio Corporation of America) is not really the first company name that comes to mind when thinking about radar, be it weather, aircraft navigation, or nautical navigation. Instead, I think of radios and televisions and even satellites; RCA developed the circa 1958 SCORE series. According to this 1955 article in Radio & Television News magazine, RCA designed and built a a C-band airborne radar system for detecting adverse weather conditions enroute, at a range of up to 150 miles. Operating at around 5.4 GHz at 75 kW peak, the AVQ-10 radar unit was primarily meant for weather avoidance rather than for terrain and aircraft avoidance. The installed weight of 125 pounds was rather amazing considering the use of vacuum tubes and a CRT display (also a vacuum tube), along with leaded passive components and bulky, heavy (relatively) transformers for providing high voltage...

PCBONLINE Blog: How to Create a Custom PCBA

PCBONLINE Blog: How to Create a Custom PCBA - RF CafePCBONLINE, a one-stop custom PCB/PCBA manufacturer for prototypes, small-batch, and massive production, recently published a technical blog to explain how to create a custom PCBA. It answers what is a PCBA, how to create a custom PCBA, the techniques used for manufacturing the PCBA, etc. When a PCB is mounted with electronic components, it becomes a PCBA (printed circuit board assembly), which is a semi-finished electronic product that achieves the vital function of an electronic device. PCBAs are used in almost all electronics industries. PCBAs manufactured by PCBONLINE include the high frequency PCBA, multilayer PCBA, rigid-flex PCBA, aluminum PCBA, etc. 1 to 100 layer PCBAs can be delivered in 3 days...

Printing High-Speed Low-Power Organic Transistors

Printing High-Speed Low-Power Organic Transistors - RF Cafe"For around 10 years, smartphones and computer screens have been based on a display technology composed of so-called thin film transistors. These are inorganic transistors that require very little power, and they have proven themselves capable, given their widespread adoption. But they have limits that researchers have been busy trying to overcome. 'We explore new ways to improve upon thin film transistors, such as new designs or new methods of manufacture,' said Gyo Kitahara, a Ph.D. student from the Department of Applied Physics. 'Organic thin film transistors, for example, have a bright future in LCD screen devices. Compared to the inorganic kind currently used..."

RCA Victor Advertisement from The Saturday Evening Post c1948

RCA Victor Advertisement from the November 6, 1948, The Saturday Evening Post - RF CafeHere is an advertisement by RCA Victor (Radio Corporation of America) from the November 6, 1948, edition of the The Saturday Evening Post. As was common in the day, the company specifically addresses Americans in an American magazine. Rarely anymore does a major American company use the word "America" or "American" in promotional material because of globalism and the fear of being too committed to the well-being of its native country. The same is true of most western countries' corporations, where their country names can be substituted for "America" in this piece. Up through about the 1980s it was commonplace to specifically address countrymen. Once manufacturers ramped up offshoring efforts the practice began disappearing. Offshoring is distinctly different from importing another...

ConductRF Low Smoke / Zero Halogen Cable Solutions

ConductRF Low Smoke/Zero Halogen Cable Solutions - RF CafeConductRF is pleased to offer Low Smoke / Zero Halogen Jacketed RF Cables for various applications Indoor and Outdoor for Naval Ship-Board applications. We have two ranges of solutions aimed at differing RF requirements with our SBA series aimed at Higher Frequency 18 GHz needs. These are 100% factory tested to exacting VSWR and Loss standards because, We know, Results Count! ConductRF manufactures a range RF Cables in support of Ship Board applications, where Low Smoke, Zero Halogen requirements are mandated. These cable have Low Smoke Polyolefin Jackets that are suitable for Ship Board Environments. The Cable solutions are commonly available in 3 sizes with cable OD of 0.240", 0.405" and 0.590"...

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.

For the Record: Scatter Communications

For the Record: Scatter Communications, October 1955 Radio & Television News - RF CafeIt seems Amateur radio operators in every country have perpetually been in a battle against government bureaucrats. Early on, Hams were allocated small segments of available "usable" spectrum and a fairly wide swath of the less desirable spectrum. That was especially true of the microwave bands when there was not a lot of components and equipment available that could operate at the higher frequencies. Those familiar with history are familiar with the situation where Amateurs developed a lot of the technology for operating in the upper MHz and into the GHz realm, and then the government snatched it from them for commercial and military use. Hams pretty much pioneered atmospheric scatter as a means for long distance (DX), over-the-horizon communications using those upper frequencies. This editorial from a 1955 issue of Radio & Television News magazine reports on a relatively newer...

Windfreak Technologies withwave microwave devices - RF Cafe
NorthEast RF Antenna Testing Services LadyBug Technologies LB480A RF Power Sensor Connectors - RF Cafe
About RF Cafe
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Copyright: 1996 - 2024
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    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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