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Homepage Archive - October 2019 (page 5)

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

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See Page 1 | 2 | 3 | 4 | 5 of the October 2019 homepage archives.

Thursday 31

Progress in Television

Progress in Television, January 1948, Radio-Craft - RF CafePrior to modern flat screen LED, LCD, and (rarely anymore) plasma television displays, image projection systems ruled. Cathode ray tubes (CRTs) dominated image displays from around the 1940 through the early 2000s. Prior to that electromechanical projection schemes were used to basically magnify a small picture and display it on a larger screen - either from the front or from the back. Some of the gizmos were pretty complicated with whirling plates and clacking shutters. Dr. Vladimir Zworykin, who wrote this 1948 Radio-Craft magazine article, is widely credited for making television practical with his image orthicon, or iconoscope, "camera" tube for capturing real-time moving images in the transmitter. He also made significant improvements in the cathode ray tube for projecting the images in the receiver. RCA, for whom ...

Many Thanks to San Francisco Circuits for Continued Support!

San Francisco CircuitsSF Circuits' specialty is in the complex, advanced technology of PCB fabrication and assembly, producing high quality multi-layered PCBs from elaborate layouts. With them, you receive unparalleled technical expertise at competitive prices as well as the most progressive solutions available. Their customers request PCB production that is outside the capabilities of normal circuit board providers. Please take a moment to visit San Francisco Circuits today.

Impedance Matching with Transmission Lines

Impedance Matching with Transmission Lines Ward Silver (9/2019 QST) - RF CafeWard Silver (N0AX) retired from writing his "Hands-On Radio" monthly column in QST magazine back in 2017, but his sage-ness continues to appear in QST, Nuts & Volts, and other publications. The November 2019 QST (login required) issue contains a very nice article of his entitled, "About Impedance Matching with Transmission Lines." If you are studying for a Ham license, you'll want to read it. Mr. Silver also has an excellent presentation video on The Basics of Impedance Matching by Ward Silver, N0AX, YouTube - RF CafeYouTube entitled, "The Basics of Impedance Matching" that is well worth your time if you're at all fuzzy on the topic. Here is the "Impedance Matching 101," Power Point presentation used. Oh, RF Cafe is referenced in the QST aforementioned article!

Teledyne Defence & Space Intros VPX Transceiver at AOC 2019

Teledyne Defence & Space Unveils a New VPX Transceiver at AOC 2019 - RF Cafe"At next week's annual Association of Old Crows (AOC) Symposium, Teledyne Defense Electronics (TDE) will be featuring its latest advancement in VPX modular technology, a 66U VPX Transceiver with the fastest tuning and lowest phase noise performance available on the market today. Teledyne developed the Transceiver on a modular platform to address the industry's interest in compressing development cycles and planning for technology insertion in program life extensions. This broadband 6-18 GHz VPX card is ideal for meeting the increasingly demanding requirements of today's microwave Transceiver applications in an open systems-based platform. In addition to its new standard-setting phase noise and tuning performance levels, the 6U Transceiver offers a high dynamic ..."

World's Longest Subsea Electricity Interconnector

Building the World's Longest Subsea Electricity Interconnector - RF Cafe"North Sea Link, a subsea electricity cable linking the UK with Norway, will be the longest interconnector of its kind in the world. Jon Excell explores the engineering challenges behind this milestone energy project It's perhaps surprising, given the increasingly divisive nature of the Brexit conundrum. But at a time when all we seem hear about is the severing of political ties to Europe, the UK is becoming ever more closely connected to the European mainland via an ambitious series of underwater power cables linking its energy network with the grids of its nearest continental neighbors. Across Europe, these so-called interconnectors, which enable countries to trade and transfer electricity across borders ..."

Alliance Test Equipment: Used & Refurbished, Purchase & Rental

Allied Test Equipment Products - RF CafeAlliance Test sells used / refurbished test equipment and offers short- and long-term rentals. They also offer repair, maintenance and calibration. Prices discounted up to 80% off list price. Agilent/HP, Tektronix, Anritsu, Fluke, R&S and other major brands. A global organization with ability to source hard to find equipment through our network of suppliers. Please visit Allied Test Equipment today to see how they can help your project.

Wednesday 30

Carl & Jerry: Two Tough Customers

Carl & Jerry: Two Tough Customers, June 1960 Popular Electronics - RF CafeHmmm... this is the first time recall either of Carl's or Jerry's father, at least where either was present in the story. Their mothers are mentioned on occasion for providing sandwiches or uttering words of caution when embarking on a sleuthing mission. In this episode entitled "Two Tough Customers," creator and author John T. Frye have the techno-teens set out on an adventure to shop for a good deal on a fundamentally sound car - which they would own in a partnership set up by their fathers. As you would expect if you are an ardent C&J follower, their effort includes inspecting not just the mechanical integrity but also the electrical system health. Frye always used his stories as the basis for a lesson on some technical aspect of everyday life. The boys broke teenage car owners into three groups: Hot-Rodders, Show-Offs, and Mechs. They seemed to assign one trait or the other, but not a combination thereof. Personally, I was a bit of all three with my first car - a 1969 Camaro SS. While reading, see if you notice what I did about the battery measurement ...

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 (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 ...

ThinkRF Intros 40 GHz RF Downconverter for 5G

thinkRF Introduces 40 GHz RF Downconverter for 5G Frequencies - RF CafeThinkRF Corporation, the leader in software-defined spectrum analysis, today announced the new ThinkRF D4000 RF Downconverter. The platform is the industry's first 40 GHz downconverter, allowing engineers to quickly and reliably analyze the new 5G wireless standard by extending the range of their existing RF test equipment. To leverage the performance, latency, and capacity that 5G promises, you need equipment which can properly analyze the higher frequencies and wider bandwidths of these new signals. This portable, plug-and-play ThinkRF downconverter allows mobile operators and military systems integrators (SIs) to easily upgrade ...

Field-Effect Transistors

Field-Effect Transistors, October 1966 QST - RF CafeThe concept of a field effect transistor (FET) has been around in theory for a long time*, but manufacturable devices arrived in designers' labs not until the early 1960s. This article from the October 1966 edition of QST magazine gives a good introduction to the physics of a basic FET as well as the junction FET (JFET) and the insulated gate FET (IGFET), all of which are still in widespread use today. What you learn about them here is applicable today. In fact, I swear some of the drawings are the same ones that appeared in my college semiconductor physics text books (admittedly from the late 1980s, so not too much of a surprise) ...

Exodus Advanced Communications Intros 18-40 GHz, 40 W PAs

Exodus Advanced Communications Intros 18-40 GHz, 40 W Power Amplifiers - RF CafeExodus Advanced Communications' 18.0 to 40.0 GHz, 40W+ Solid State Amplifiers (SSA) are designed for general EMC testing applications as well as Mil-Std 461(RS103) standards. Models AMP4065-LC (18.0-26.5 GHz) and AMP4066-LC (26.5-40.0 GHz) compact designs provide superb RF performance with unprecedented P1dB power as compared to TWT's. The SSA's exhibit 46 dB minimum gain, monitoring parameters for forward and reflected power, VSWR, and voltage, current and temperature sensing for outstanding reliability and ruggedness. Suitable for all single channel modulation standards. Rack mounted system  ...

Amazon Reports Collision Risk for Kuiper Mega Satellite Constellation

Amazon Reports Collision Risk for Kuiper Mega Satellite Constellation - RF Cafe"Amazon responds to recent FCC questions about the odds that any of its Kuiper communication satellites will collide with space debris. For the first time, we have a complete, representative number for the overall orbital collision risk of a satellite mega-constellation. Last month, Amazon provided the U.S. FCC with data for its planned fleet of 3,236 Kuiper System broadband Internet satellites. If one in 10 satellites fails while on orbit, and loses its ability to dodge other spacecraft or space junk, Amazon's figures show that there is a 12% chance that one of those failed satellites will suffer a collision ..."

VidaRF: Passive RF & Microwave Components

vidaRF passive RF & microwave components - RF CafeAt VidaRF, the phrase 'Providing Simple Solutions for Complex Connections' is more than just a slogan – it's a mindset, a mission, and a driving force behind everything we do. Their pledge is to design and distribute high performance, cost effective RF Microwave products to fit each customer's unique applications. Please visit VidaRF today to see how their lines of attenuators & terminations, directional couplers, power dividers, coaxial connectors, and circulator & isolators can be of use to your project. "When the standard just will not do, VidaRF has the solution for you!"

Tuesday 29

Hallicrafters Radio Advertisement - End of War in Sight

Hallicrafters Radio Advertisement - End of War in Sight, November 1944 Radio News - RF CafeHere is another example of how enthusiastically both manufacturers and consumers were met news of the impending end of World War II. Amateur radio operators were amongst those most affected during the war years because of the FCC having issued a moratorium against transmissions, for security purposes. The same thing happened during World War I, in fact*. Back in the day when citizens were fiercely patriotic and appreciative of their freedoms, many Hams of service age answered a call to donate certain kinds of equipment (panel meters, tuning capacitors, transformers, etc.) for use in repair and retrofitting of field gear. They also enlisted by the tens of thousands to lend their radio skills in the service of their country. To the government's credit, the sacrifices were repaid handsomely ...

BCICTS Event Happening November 3-6

2019 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium - RF CafeThe 2019 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS) is being held next week, November 3-6, in Nashville, TN. BCICTS is sponsored by the IEEE Electron Devices Society and technically co-sponsored by the IEEE Solid State Circuits Society and the IEEE Microwave Theory & Techniques Society. BCICTS will unify the long, rich, and complementary technical legacies of BCTM (31 years) and CSICS (39 years) into one exemplary symposium. In addition to the strong technical program, BCICTS will include a vibrant technical exhibition and several social events that allow participants to interact and network in a relaxed setting.

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. 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 ...

Electronic Analogy Quiz

Electronic Analogy Quiz, August 1960 Popular Electronics - RF CafeThis electronics analogy quiz is a little easier than many of the others published in Popular Electronics magazine because all of the electrical and mechanical objects depicted here are very familiar. The concepts might seem trivial to those of us who have been immersed in the science for decades, but I for one can remember when first hearing these analogies how helpful they were. Not only that, but I also recall during physics and mechanics courses in college being amazed at the similarity of equations shared by electrical and mechanical processes. Wikipedia has a huge page describing many of the most familiar mechanical-electrical analogies ...

Custom MMIC Receives 2019 Massachusetts Manufacturer of the Year Award

Custom MMIC Receives 2019 Massachusetts Manufacturer of the Year Award - RF CafeCustom MMIC, a leading designer and manufacturer of high performance monolithic microwave integrated circuits (MMICs), is proud to be this year's recipient of the Massachusetts Manufacturer of the Year Award for Eastern Massachusetts Middlesex District. Over the past four years this prestigious award has been presented to those companies that embody the entrepreneurial spirit and passion for continued growth using innovation and determination as their guiding principles. This award is especially gratifying knowing Massachusetts is home to so many unique and successful small businesses pushing the boundaries of what is possible every day. "Custom MMIC was founded in 2006 on the three basic tenets of innovation, integrity and quality. To this day we carry on those ...

5G Reigniting RF Emissions Health Debate

5G Reigniting RF Emissions Health Debate - RF Cafe"Just a few weeks ago a very heated discussion erupted in my Denver neighborhood's Nextdoor social networking channel. The reason for the debate was the appearance of new 30-foot 5G small cell tower on a nearby block. The discussion thread contained warnings of how RF emissions can cause all type of serious health problems ranging from headaches to cancer. Eventually neighbors moved onto to other topics but this wasn't the first time I had heard 5G being blamed for health problems. A few months ago a friend sent me a link to a news segment from a group called RT America in which 'experts' warned that 5G signals might cause all kinds of dire health problems including brain cancer and autism ..."

RF Superstore: Supplier of RF & Microwave Components

RF Superstore coaxial cable, connectors, adapters - RF CafeRF Superstore launched in 2017, marking the return of Murray Pasternack, founder of Pasternack Enterprises, to the RF and microwave Industry. Pasternack fundamentally changed the way RF components were sold. Partner Jason Wright manages day-to-day operations, while working closely with Mr. Pasternack to develop RF Superstore into a world class RF and microwave component supplier. RF coaxial connectors & adapters, coaxial cable & cable assemblies, surge protectors, attenuators. Items added daily. Free shipping on orders over $99. We're leading the way again!

Monday 28

Crystal Finishing

Crystal Finishing, November 1944 Radio News - RF CafeWith a last name like Blattenberger and an unusually spelled first (Kirt), I learned a long time ago not to poke fun at anybody's name, but surely the parents of Dr. Hal F. Fruth had a sense of humor when assigning their little bundle of joy in such a manner (HalF Truth?). Maybe I assume too much. Anyway, the good doctor published in this issue of Radio News magazine a very extensive treatise on the art and science of mass producing radio frequency crystals at a time when the country - and free world - was in urgent need of them. He notes that, "Prior to Pearl Harbor Day, the world production of these plates and bars could be counted by the thousands. The present production rate has skyrocketed more than one hundred fold so that the present production rate is nearly 30,000,000 units per year ...

VidaRF Expands Broadband Directional Couplers to 5G mmWave

VidaRF Expands Broadband Directional Couplers to 5G mmWave - RF CafeVidaRF, a manufacturer of high performance RF and microwave high performance circulators, isolators, couplers, power dividers, and other passive components, has expanded its line of broadband directional couplers to cover 2 to 40 GHz for all wireless applications from cellular through 5G mm-wave with 2.92 mm interfaces. Features include 10, 16, 20 and 30 dB coupling values, low VSWR, high directivity, broadband operation, compact size, and operating temperature range of -55°C to +85°C. Sealed and painted to meet IP65 standards. Custom designs to meet your needs are available ...

Hams in Combat: A Lady of Mercy

Hams in Combat: A Lady of Mercy, July 1944 QST - RF CafeThis is another installment of the Hams in Combat series that QST ran during WWII. I enjoy waxing vicariously nostalgic of a time before I was born, at time when there was still honor, courage, selflessness, and pride of country. During World War II, it was an ingrained part of most citizens, whether or not they happened to be serving in the military. Our modern day troops still have it, but sadly fewer and fewer people see their own country as any place special in the world. Sure, as General William Tecumseh Sherman famously said, "War is hell," but then again so is witnessing the tearing apart of your country from forces within ...

Anatech Electronics Mid-October Product Update

Anatech Electronics Mid-October Product Update - RF CafeAnatech Electronics offers the industry's largest portfolio of high-performance standard and customized RF and microwave filters and filter-related products for military, commercial, aerospace and defense, and industrial applications up to 40 GHz. In their mid-October Product Update, Anatech has introduced a 1000-4000 MHz 2-way power divider with SMA connectors, a surface mount 4400-5000 MHz isolator, and a 2 dB 1 watt SMA attenuator. Custom RF power directional coupler designs can be designed and produced when a standard cannot be found, or the requirements are such that a custom approach is necessary ...

Phased Array Antenna for SATCOM Applications on Mobile Platforms

Phased Array Antenna for SATCOM Applications on Mobile Platforms - RF Cafe"ReQutech and Forsway together with a research team from the Linköping University of Technology have collaborated to develop a new phased array antenna solution for Satcom applications on mobile platforms. This project is supported by the strategic innovation program 'Smarter Electronic Systems' - a joint venture by Swedish innovation agency Vinnova, Formas and the Swedish Energy Agency to promote Swedish technology. This program is a part of a pivotal development initiative by ReQuTech within Phased array antennas. The company aims to introduce the completed solution to the global market once it is complete ..."

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. They offer the generally known tubular, LC, cavity, and waveguide designs, as well as state of the art high performance suspended substrate models. 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. Established in 1979. Please contact Reactel today to see how they might help your project.

Sunday 27

Engineering Crossword Puzzle for October 27

Engineering Crossword Puzzle for October 27, 2019 - RF CafeHere is the last engineering- and science-themed crossword puzzle for October. These custom-made crosswords are done weekly for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. The jury is out on whether or not this type of mental challenge helps keep your gray matter from atrophying in old age, but it certainly helps maintain your vocabulary and cognitive skills at all ages. A database of thousands of words has been built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, 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 ...

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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 tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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