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Homepage Archive - March 2019 (page 3)

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.

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

Friday 22

Hitachi Nuvistor Advertisement

Hitachi Nuvistor Advertisement, March 6, 1964 Electronics Magazine - RF CafeAccording to the somewhat limited unique information available about the "nuvistor" vacuum tube amplifier, it was superior to many glass-encapsulated vacuum tubes. Lower noise figure, smaller size, greater ruggedness, intrinsically shielded, and relatively higher operating frequency were the main marketing standpoint. RCA introduced the nuvistor in 1959, and shortly thereafter GE, started making them, and then by 1964 Hitachi was offering nuvistors. The manufacturing process, where the entire assembly was performed in a vacuum chamber, made nuvistors more expensive than competitor glass tubes. The nuvistor concept might have been big if transistors had not been making such rapid progress in supplanting most vacuum tubes. In fact, nuvistors (a portmanteau of "new" and "transistor") were supposed ...

Design PCBs for EMI, Part 2: Basic Stack-Up

Design PCBs for EMI, Part 2: Basic Stack-Up - RF Cafe"Part 1 of this series [by Kenneth Wyatt] described how digital signals propagate through PC boards. In part 2, we look at specific board designs to achieve low EMI. The biggest issue I see in my clients' board designs is poor layer stack-up. Reiterating the two fundamental rules from part 1 and realizing digital signals and power (transients) are electromagnetic waves moving in the dielectric layer, we see there are two very important principles when it comes to PC board design: Every signal and power trace (or plane) on a PC board should be considered a transmission line. Digital signal propagation in transmission lines is really the movement of electromagnetic fields in the space ..."

Smiths Interconnect Needs a Manufacturing Engineer

Smiths Interconnect Needs a Manufacturing Engineer - RF CafeSmiths Interconnect currently has a job opportunity for a Manufacturing Engineer. Smiths is always looking for curious minds. For new colleagues who want responsibility and relish a challenge. Those who would like to use their talents to help make the world safer, healthier, more efficient and more connected. Job Description: Develops and Implements production and assembly methodologies for High Reliability high frequency RF electronics used in commercial and military applications, Development of assembly fixtures and RF Test fixtures, Conducts manufacturability and variation analyses to insure that manufacturing process capability matches requirements, Analyzes design/build concepts to evaluate producible products, Root cause analysis, Continuous flow ...

Vector-Circuit Matching Quiz

Vector-Circuit Matching Quiz, June 1970 Popular Electronics - RF CafeThis vector circuit matching quiz will hurt the brain a little more than most of the ones that were printed in Popular Electronics. In order to score well, it helps to visualize the circuits relative to where they would appear on a Smith Chart. Capacitive impedances lie in the bottom half and have negative phases (-s, -jω). Inductance lie in the upper half and have positive phases (s, jω). The familiar 'ELI the ICE man' mnemonic helps, too. Be sure to pay attention to the color of the vector arrow heads. Example: In a purely inductive circuit like #4, voltage leads current by 90°. Since phase rotation is CCW, you need to look for lettered phase diagram where the white arrowhead (voltage) is 90° ahead of the black arrow head ...

Microfabrication Modifies Semiconductor Material Atom-by-Atom

Microfabrication Modifies Semiconductor Material Atom-by-Atom - RF Cafe"To keep up with Moore's Law - an observation made in the 1960s that the number of transistors on an integrated circuit doubles about every two years - researchers are finding ways to cram as many transistors as possible onto microchips. The newest trend is 3D transistors that stand vertically, like fins, and measure about 7 nanometers across - tens of thousands of times thinner than a human hair. Tens of billions of these transistors can fit on a single microchip, which is about the size of a fingernail. A modified chemical-etching technique, called thermal atomic level etching (thermal ALE), was used to enable precision modification of semiconductor materials at the atomic level ..."

Custom MMIC: Off-the-Shelf and Custom MMICs

Custom MMIC - RF CafeCustom MMIC is a fabless RF and microwave MMIC designer entrusted by government and defense industry OEMs. Custom and off-the-shelf products include switches, phase shifters, attenuators, mixers and multipliers, and low noise, low phase noise, and distributed amplifiers. From next-generation long range military radar systems, to advanced aerospace and space-qualified satellite communications, microwave signal chains are being pushed to new limits - and no one understands this more than Custom MMIC. Please contact Custom MMIC today to see how they can help your project ...

Thursday 21

Z-Comm Intros 640 MHz Fixed Frequency Synthesizer

Z-Communications Intros 640 MHz Fixed Frequency SynthesizerZ-Comm announces a new RoHS compliant Fixed Frequency Synthesizer model SFS0640A-LF in the UHF frequency. The SFS0640A-LF is a single frequency synthesizer that operates at 640 MHz with an external 10 MHz reference and features a typical phase noise of -100 dBc/Hz, -105 dBc/Hz, and -124 dBc/Hz at the 1 kHz, 10 kHz and 100 kHz offsets, respectively. The SFS0640A-LF is designed to deliver a typical output power of 0 dBm with a VCO voltage supply of 5 Vdc while drawing 25 mA (typical) and a phase locked loop voltage of 3 Vdc while drawing 9 mA (typical). This Fixed Frequency Synthesizer ...

QuinStar Technology Seeking a Tester / Technician

Tester / Technician Needed by QuinStar Technology - RF CafeQuinstar Technology, an AS9100 certified aerospace hardware design and manufacturing company in Torrance, CA, is currently looking for an Tester / Technician to join our team! We are primarily looking for candidates with experience and/or background in RF/microwave testing. Preference will be given to those with relevant experience. Primary job responsibilities include testing of microwave components and associated duties. Employment is contingent upon successfully passing a background check and pre-employment physical and providing proof of eligibility to work in the U.S. ...

Introduction to Solid-State Devices and Power Supplies

Introduction to Solid-State Devices and Power Supplies (NEETS Module 7, pp1-10) - RF CafeThese NEETS training modules created by the U.S. Navy appear to have originally come out in 1990s and has been modernized a few times since then, so the information is fairly up to date. You will still find a lot of descriptions of vacuum tubes, but that is because even in 1998 the military still had a lot of legacy equipment that needed to be maintained. This particular module provides the student with an introduction to and history of semiconductor physics. The chapter runs a total of 62 pages so there's a lot of content ...

L-M, Sequans Develop LTE-over-Satellite Solution

LM, Sequans Develop LTE-over-Satellite Solution - RF Caf"The aerospace giant Lockheed Martin is working with Sequans Communications to develop new LTE for satellite technologies. The two companies are enabling LTE end user devices to connect directly to geostationary satellites in what they're describing as a world-first achievement with wide application. 'Sequans has expertise adapting LTE technology for special purposes such as this one,' said Scott Landis, a director at Lockheed Martin, in a press release. 'Sequans engineers modified their existing LTE chips to enable a new LTE-to-satellite communication specification developed by Lockheed Martin. LTE to satellite represents an important breakthrough in mobility and connectivity ..."

Acoustic Surface-Wave Devices

Acoustic Surface-Wave Devices, March 1971 Popular Electronics - RF Cafe"Praetersonic" - now that's a word you don't run up against very often. It is a combination of praeter* (beyond) and sonic (related to sounds), or what more familiarly is called ultrasonic. If fact, praetersonics was the early term given to surface acoustic wave (SAW) piezoelectric devices. Amazingly, even as far back as the early 1970s, SAW filters were being fabricated that worked in the 40 MHz realm. This Popular Electronics article does a really nice job of introducing the basics of SAW and BAW (bulk acoustic wave) technology at the time it was coming into the mainstream. Lots of hurdles still needed to be overcome, like high insertion loss, difficult to control impedances and internal signal reflections, etc. As with many new technologies, pundits cast hopeful prediction ...

ConductRF PFT33 Micro Flexible NanoRF Cables for VITA67.3

ConductRF PFT33 Micro Flexible NanoRF Cables for VITA67.3 - RF CafeConductRF's close partnership with TE in its development of its new Nano-miniature RF Solutions for VITA67.3 has put us in a great position to support your VPX RF cable assembly needs. We can support solutions up to the top frequencies of the new connector system. ConductRF's PFT33 Series of Micro Flexible Cable Assemblies has been designed directly with TE Connectivity involvement and in partnership to maximize the capabilities of TE's new Vita67.3 NanoRF VPX Modular connector system. ConductRF offers its soft FEP jacketed ø0.047"cable to facilitate maximum flexibility and provides solutions for jumper cables or assemblies to SMA, MCX ...

Wednesday 20

Transtector Releases New Series of NEMA-Rated Weatherproof Enclosures

Transtector Releases New Series of NEMA-Rated Weatherproof Enclosures - RF CafeTranstector Systems, an Infinite Electronics brand, today released a new, comprehensive line of NEMA-rated weatherproof equipment enclosures that are engineered to securely protect mission-critical electronics and are available with same day shipping to meet crucial deadlines. The new TEF14-series includes 45 enclosure configurations and 15 essential accessories available for immediate shipment. The line features multiple configurations for global applications including industrial automation, SCADA, oil and gas, mining, transportation, public works, security and automation, and much more. Each enclosure provides vital protection for key electronic ...

Time Reversal Using Quantum Computer

Time Reversal Using Quantum Computer - RF Cafe"Researchers from the Moscow Institute of Physics and Technology teamed up with colleagues from the U.S. and Switzerland and returned the state of a quantum computer a fraction of a second into the past. They also calculated the probability that an electron in empty interstellar space will spontaneously travel back into its recent past. The study is published in Scientific Reports. 'This is one in a series of papers on the possibility of violating the second law of thermodynamics. That law is closely related to the notion of the arrow of time that posits the one-way direction of time from the past to the future,' said the study's lead author Gordey Lesovik ..."

Casey Kasem's American Top 40

Casey Kasem's American Top 40How many of you remember listening to Casey Kasem's American Top 40 show on the wireless (aka radio) on Saturday afternoons back in the 1970s and 80s? WPGC was my station of choice. The opening music and tag line by Kasem is forever etched on my mind. I fill my days listening to the local Oldies station here in Erie (WMCE), so the familiar songs are still current to me. As with most things these days, extensive archives of the original American Top 40 broadcasts are available online. It is interesting to listen in on announcements of "new" songs making the Charts that are now 40 years old. If you like to wax nostalgic, tune in to a few ...

America's Undersea Battle with China for Control of the Global Internet Grid

America's Undersea Battle with China for Control of Global Internet Grid - RF Cafe"The undersea West African Cable System links Africa with Europe. Huawei Marine Networks Company made upgrades. A new front has opened in the battle between the U.S. and China over control of global networks that deliver the internet. This one is beneath the ocean. While the U.S. wages a high-profile campaign to exclude China's Huawei Technologies Company from next-generation mobile networks over fears of espionage, the company is embedding itself into undersea cable networks that ferry nearly all of the world's internet data ..."

Transient Specialists: EMC, EMI, RFI Test Equipment Rentals

Transient Specialists - RF CafeTransient Specialists specializes in EMC test equipment rentals and carries a complete line of ESD guns, surge immunity test equipment, and EFT generators. Rentals available for military (Mil-Std 461), automotive (ISO 7637), and commercial (IEC 61000-4) EMC testing. Flexible terms, accredited calibrations and technical support on EMC testing equipment offered. Equipment consists of top EMC Test System manufacturers, including Teseq, Thermo Keytek, EM Test and EMC Partner ...

Tuesday 19

Television? ... It's a Cinch!

Television? ... It's a Cinch!, March 1953 Radio-Electronics - RF CafeIf television was "a chinch," in 1953 as this Radio-Electronic article claims, the world would have had it long before then. Just like looking up the work-out solutions to a physics problem in the back of a textbook, a lot of things look simple and obvious once someone else has already done it. I guess that's not really a fair criticism of this piece since author Aisberg's goal is to assuage some of the doubts and misconceptions a lot of people had about the relatively new technology. 1953 is the year that the NTSC formalized its color TV standard, which, BTW, was careful to accommodate B&W transmissions on the same channels - similar to how AM-FM stereo and stereo FM radio can coexist with monaural (mono) broadcasts. Television, in case you are not aware, began as an electromechanical system with picture frames and shutters, spinning discs, and other Rube Goldberg contraptions ...

R&S Automated RF Component Test for Design Engineers w/o Programming

Rohde & Schwarz Automated RF Component Test for Design Engineers w/o Programming - RF CafeRohde & Schwarz has produced a new webinar titled "Automated RF Component Test for Design Engineers Without Programming," available for viewing at no cost. Martin Lim, National Applications Engineer at R&S, is the presenter. "The complexity of RF designs is increasing and the pressure to hit market windows is too. Enabling the automation of repetitive tests like a power sweep over frequency can greatly help confirm if a new design is ready or if further work needs to be done. Unfortunately, programming is usually outside the normal responsibilities of most RF designers and include time-consuming drawbacks like wading through long programmers manuals and debugging code. This On Demand Webinar ...

Stop Pay TV!

Just Say "No" to Pay TV - RF CafeThe more things change, the more they remain the same. People (including, admittedly, me) don't want to have to pay for any type of media delivery, especially when it arrives via air waves or the Internet. Six months before I was born, a reader of Radio-Electronics magazine wrote to declare his outrage at the fledgling industry of Pay Television. That a viewer would be expected to pay the broadcaster for a show that was being, in his opinion, amply subsidized by advertisers, was an outrageous concept, an unthinkable assault on all that is holy. While his indignation was probably shared by the majority of the television viewing public, evidently the maniacal scheme succeeded. In the 1950s and even through part of the 1970s, television shows typically included about 10-12 minutes of commercials and other non-show segments for each hour of broadcast. Season 1, Episode 1 of Star Trek, for example, ran for 50 minutes; that was in 1966 ...

Product Engineer Needed by QuinStar Technology

Product Engineer Needed by QuinStar Technology - RF CafeQuinstar Technology, an AS9100 certified aerospace hardware design and manufacturing company in Torrance, CA, is currently looking for a Product Engineer to join our team! We are primarily Looking for a highly motivated quick learner with a bachelor of science degree in electrical engineering or equivalent industry experience and who is a U.S. citizen. Should have experience with the design and layout of microwave and millimeter-wave products and subassemblies, including LNA, frequency converters, antennas, and PA. A knowledge of mechanical design of new housings, PA and heat sink configurations is desirable. Experience with HFSS, AWR, SolidWorks or similar software is desired ...

Is Analog Signal Processing the Future of AI?

Is Analog Signal Processing the Future of AI? - RF Cafe"Gene Frantz may have been the visionary for DSP back in the 1970s, but now he thinks we need to turn our attention back to analog to tackle the big challenges of artificial intelligence (AI). Previously a principal technology fellow at Texas Instruments, Frantz is now a professor at Rice University. He is also the co-founder and chief technology officer at at Octavo Systems, a fledgling semiconductor-in-package (SiP) company based in Austin, Texas. Speaking during the launch of Octavo's OSD32MP1 - the company's first SiP based on the newly announced STMicroelectronics STM32MP1 microprocessor - Frantz told EE Times that he believes SiP and analog processing will be the future. He said AI needs a better solution and suggested that we should consider going back to analog signal processing ..."

Nova Microwave: RF & Microwave Circulators & Isolators

Nova Microwave circulators & isolatorsNova 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. Please visit Nova Microwave today ...

Monday 18

Software Defined Radio Handbook (Pentek) 14th Edition

Software Defined Radio Handbook (Pentek) - RF CafePentek has published the 14th edition of their popular "Software Defined Radio Handbook." The download is free, but you need an account to access it on their website. Written by Pentek vice-president and cofounder Roger Hosking, it is mostly an infomercial for their products, but the first dozen pages contain good background information on topics such as sampling, principles of SDR, and FPGAs. A readily accessible version is available here if you do not like creating new accounts ...

3D Printer Uses Ray of Light to Shape Complex Objects

3D Printer Uses Ray of Light to Shape Complex Objects - RF Cafe"A 3D printing technique from UC Berkeley shapes objects all at once rather than layer by layer, allowing for more complex and smooth objects. A new light-based 3D-printing approach and machine can fabricate complex objects in minutes that are smoother and more flexible than what's currently possible. Dubbed the 'replicator' - a reference to the Star Trek television program - and developed by researchers at UC Berkeley, the printer uses a ray of light to transform liquids into objects all at once rather than layer by layer, which is how typical 3D printers create objects. The replicator was a device on the famous program that would materialize any object on demand ..."

Hams in the FBIS

Hams in the FBIS, January 1945 QST - RF CafeWe hear and read a lot in the news about the electronic surveillance carried out by governments - on both foreign entities and civilians. If you think this is a phenomenon that has only existed since the age of cellphones and the Internet, you might be interested in this article that appeared in a 1945 issue of the ARRL's QST magazine. Long before the entire textual content of the Encyclopedia Britannica could be carried on a USB stick in your pocket - and access virtually all the information in the world on your iPhone, engineers were developing recording media to facilitate the capturing and later analysis of over-the-air and wired communications. They wanted both encrypted and unencrypted conversations. The National Archives has a huge store of magnetic tapes, vinyl discs ...

Smiths Interconnect Looking for an RF Test Coordinator

Smiths Interconnect Looking for an RF Test Technician - RF CafeSmiths Interconnect currently has a job opportunity for an RF Test Coordinator. Smiths is always looking for curious minds. For new colleagues who want responsibility and relish a challenge. Those who would like to use their talents to help make the world safer, healthier, more efficient and more connected. Job Description: Coordinates and performs the operation, training, maintenance and continuous improvement of the BTPA RF lab, Compact Antenna Test Range (CATR) & Environmental Stress Screening (ESS) lab, and the MMW Far-Field (FFR) & Near-Field Ranges (NFR). Duties & Responsibilities: Utilize engineer drawings, test procedures, and processes to support Antenna mechanical and test assemblies. Plan performance schedule for various test and measurement needs to support production schedule and SII's internal / external customers. Assist Manufacturing Engineering and Test Coordinators ...

Nanosatellites Could Be Answer to Mobile Not-Spots

Nanosatellites Could Be the Answer to Mobile Not-Spots - RF CafeHa! I've never heard the term "not-spot" before to describe a area with no coverage. "Start-up UbiquitiLink reckons it's cracked the challenge of affordable satellite connectivity to regular handsets through the use of nanosatellites. You can't use traditional geostationary satellites to fill regular cellular coverage gaps because they're too expensive and are positioned 35,000 km above the surface of the earth, which is way further than cellular signals are designed to go and introduces excessive lag to the signal. An obvious solution is to use satellites at a much lower orbit, but until now that hasn't been economically viable. UbiquitiLink reckons it has the answer to this conundrum and went to MWC last week to tell everyone all about it ..."

PCB Directory: Printed Circuit Board Fabrication & Assembly

PCB  Directory - RF Cafe

PCB 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 (e.g., material, flexible, rigid), Geographical location, and more ...

Sunday 17

RF Cafe Engineering & Science Crossword Puzzle for March 17

RF Cafe Engineering & Science Crossword Puzzle March 17, 2019This very large crossword puzzle will keep you busy for a while. Since 2000, I have been creating custom technology-themed crossword puzzles 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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