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Homepage Archive - July 2017 (page 2)

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.

Homepage Archive Pages

2017:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2016:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2015:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2014:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2013:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

See Page 1 | 2 | 3 of the July 2017 homepage archives.

Friday 21

Thursday 20

Nuclear Radiation & Detection

Nuclear Radiation & Detection, December 1972 Popular Electronics - RF CafeParts 1 and 2 of this series covered the theory of nuclear physics and laboratory investigation devices. This final installation talks about commercially available test instruments for detecting and measuring nuclear radiation levels. My introduction to Geiger counters was in the old The Adventures of Superman television show (the originals with George Reeves) where they were used by villains to verify that their stash of Kryptonite would be sufficient to disable our superhero. I could not find anywhere whether Kryptonite's emission type is alpha particles (helium nucleus; i.e., 2 protons and 2 neutrons), beta particles ...

Advanced Energy Needs an RF Electrical Engineer

Advanced Energy Looking for an RF Electrical Engineer - RF CafeAdvanced Energy has devoted more than three decades to perfecting power enabling design breakthroughs and driving growth for leading semiconductor and industrial customers. Our precision power and control technologies, along with our applications know-how, inspire close partnerships and perpetual innovation in thin-film and industrial manufacturing. The RF Engineer performs engineering work in applied research, design, development, testing, manufacturing, and documentation of RF products or systems. In this role, you will work with customers to understand their equipment ...

Spintronics Gets a Boost Through Measuring and Controlling Spin Voltage

Spintronics Gets a Boost Through Measuring and Controlling Spin Voltage - RF Cafe"Researchers at Harvard University have taken an important step in the realization of 'spintronic' devices by developing a technique for both measuring and controlling the spin voltage of electrons, also known as their spin chemical potential. This spin voltage characterizes the tendency of electron spins to diffuse through a material. Whereas in a conducting material electrons can physically move from point A to point B (an electric current), with spin voltage the spin of an electron can be transferred to a neighboring electron. This communication ..."

Guglielmo Marconi Obituary 1874 - 1937

Guglielmo Marconi Obituary 1874 - 1937, October 1937 Radio-Craft - RF CafeNews was a bit slow to spread prior to the Internet. Unless you worked in a newsroom with a ticker machine clacking away all day heralding breaking headlines from around the world, your access was relegated to the discretion of media editors and producers. Items like the demise of radio pioneer Guglielmo Marconi on July 20, 1937, due to a heart attack would surely have been broadcast on radio shows (not many households had TVs at the time) and printed in major newspapers, but long lead times for magazines meant a four month delay for publications like Radio-Craft. This story appeared along with separate editorial by Hugo Gernsback ...

ConductRF's FPA Semi-Flexible Performance RF Cables DC-60 GHz

ConductRF Offers FPA Semi-Flexible Performance RF Cables DC to 60 GHz - RF CafeConductRF's FPA RF Cable Assemblies provide a cost effective high performance solution for applications typically supported by Semi-Rigid or high cost flexible precision cables. Our Multi-layer shielded cable provides both flexibility and form-ability by combining a flexible spiral foil over which is a tin plated copper braid which can be formed. This create a half-way situation, but with added benefits of lower costs, improved performance and enhanced shielding. FPA Cables are available on short lead-times with custom lengths and configurations. Precision SMA, 3.5 mm, 2.92 mm & 2.4 mm are our most common ...

An Oscilloscope Trigger System in the Frequency Domain

An Oscilloscope Trigger System in the Frequency Domain - RF Cafe"If you've been tuned in to Electronic Design's articles this past year in the test and measurement arena, you're probably aware of a series by Colin Mattson (Keysight Technologies) on advanced oscilloscope triggering techniques. In the first article, he elucidates on pulse and pattern modes, where the characteristics of a pulse and the uniqueness of a pattern are utilized as the impetus of signal acquisition. In part two, he delves into edge-mode triggering, where the edge characteristics of a signal are used to mark the trigger for waveform capture. In part three, he ..."

Wednesday 19

Saelig Intros TekBox TBCGx Comb Generators for EMC Testing

Saelig Intros TekBox TBCGx Comb Generators for EMC Testing - RF CafeSaelig Company announces the availability of two new TekBox TBCGx Comb Generators for EMC testing. The TBCG1 is a radiating comb generator with an internal dipole antenna and a base frequency of 100 MHz. It radiates a comb spectrum that is characterized up to 6 GHz. The comb generator is intended as a quick reference for testing radiated noise measurements in anechoic chambers, TEM/GTEM cells, shielded chambers, or to gauge the effectiveness of cable shielding and other shielding materials. With its built-in dipole antenna the TBCG1 can be used in three orientations to emit vertically- or horizontally ...

Study Reveals 'Cash for Papers' Rewards in China

Study Reveals 'Cash for Papers' Rewards in China - RF Cafe"Chinese researchers were paid an average of $43,000 in 2016 for each paper published in Nature and Science, according to a study by information specialists in China and Canada. Wei Quan from Wuhan University, Bikun Chen at Nanjing University of Science and Technology and Fei Shu at McGill University analysed 168 "cash-per-publication" policies at 100 Chinese universities from 1999 to 2016. The researchers found that Chinese universities offer cash rewards ranging from $30 to $165,000 for papers that are published in journals indexed by Web of Science, with the average amount increasing over ..."

Simple Subsidiary Communications Authorization (SCA) Adapter

Simple Subsidiary Communications Authorization (SCA) Adapter - RF CafeUnlike Radio Broadcast Data System (RBDS) which is responsible for your FM radio being able to display song title and station identification via a digital subchannel (began in 1992), Subsidiary Communications Authorization (SCA) has been around as an analog subchannel for more than half a century. SCA (was) used for tasks such as book reading for the blind, telemetry, paging services, and most familiarly - Muzak (aka 'elevator music'). This article presents a simple circuit for stripping the subcarrier off of the FM broadcast signal to permit a listener to avoid commercials, PSAs, weather reports, and other items that are played between songs ...

The Latest in Web Design? Retro Websites Inspired by the ’90s

RF Cafe screen capture August 18, 2000 (Archive.org) - RF CafeThe NY Times has an article about a growing trend to harken back to website layouts reminiscent of the early days of the Internet. RF Cafe, which began life in 1996 as RF Tools on AOL, was there. The RF Cafe logo at the top of this page is the original from 1999.
"Web designs have come a long way in 20 years, but some are taking a step back to evoke a sort of hipster nostalgia for the early days of the internet. They're tipping their hat to the 1990s,' said David Lee, the chief creative officer of Squarespace.' 'I really hate the modern internet,' Mr. Drake said. 'My vision is to bring back making websites as a creative thing, not just as a business thing."
I couldn't agree more ...

Radiocrafts and Digi-Key Enter Global Distribution Agreement

Radiocrafts and Digi-Key Enter Global Distribution Agreement - RF CafeRadiocrafts AS, a leading provider of RF modules, today announced that it has entered a global distribution agreement with Digi-Key Electronics, the industry leader in electronic component selection, availability, and delivery. Design engineers around the world get access to RF modules and design tools from Radiocrafts with short lead-times. Radiocrafts provides surface mount RF modules for wireless networking in the ISM bands world-wide. The modules support industry standard protocols such as Wireless M-Bus, Sigfox and KNX-RF ...

Experiments Shed New Light on Iron Superconductors

Experiments Shed New Light on Iron Superconductors - RF Cafe"Two important breakthroughs in the understanding of iron-selenide superconductors have been made by two independent research groups. One team has shown that the electrons responsible for superconductivity in the material probably come from a specific atomic orbital. The other team, meanwhile, has measured the interaction between electrons and atomic vibrations in iron selenide, which is believed to be involved in its superconductivity. The research could shed light on the mystery of why some materials based on iron selenide are superconductors at relatively high temperatures ..."

Tuesday 18

Controlling Heat and Particle Currents in Nanodevices

Controlling Heat and Particle Currents in Nanodevices by Quantum Observation - RF CafeOK, I admit that the Escher-like waterfall drawing caused me to post this. "Researchers from the Theory Department of the MPSD have realized the control of thermal and electrical currents in nanoscale devices by means of quantum local observations. Measurement plays a fundamental role in quantum mechanics. The best-known illustration of the principles of superposition and entanglement is Schrödinger's cat. Invisible from the outside, the cat resides in a coherent superposition of two states, alive and dead at the same time. By means of a measurement ..."

Rise-Time Measurements

Rise-Time Measurements, August 1972 Popular Electronics - RF CafeA lot of us still use older test equipment at home and even in the company lab. As discussed in this 1972 article from Popular Electronics magazine, the displayed rise time on an oscilloscope display is not necessarily that true rise time of a signal - particularly when the speed approaches the rated bandwidth of the equipment. In that case, it is necessary to mathematically compensate for the rise times of each individual component used for making the measurement. Hooking the o-scope probe tip to the calibration point on the front of the instrument and adjusting the probe's trim capacitor for a flat response is not always good enough. Most modern o-scopes ...

Heat-Loving Quantum Oscillations

Heat-Loving Quantum Oscillations - RF Cafe"The rapidly developing science and technology of graphene and atomically-thin materials has taken another step forward with new research from The University of Manchester. This research, published in Science, shows how a variety of different electronic properties - essentially new materials - can be realised simply by applying a magnetic field. Electrons inside materials move quite differently from a free electron in vacuum: their properties are strongly affected by the electric potential of ions comprising the crystal lattice. This interaction changes the mass of electrons and makes materials ..."

Pasternack Releases New Waveguide Phase Shifters for K to W Bands

Pasternack Releases New Waveguide Phase Shifters for K to W Bands - RF CafePasternack, a leading provider of RF, microwave and millimeter wave products, has launched a new line of waveguide phase shifters in sizes ranging from WR-42 to WR-10. Typical applications include instrumentation, test benches, product development and characterization. Pasternack's new series of waveguide phase shifters is comprised of seven models that operate in the frequency range of 18 GHz to 110 GHz and in 7 waveguide bands from K to W band. They provide phase shift range from 0 to 180° and 1 dB ...

Adapting Phased Array Antennas for 5G mmWave Systems

Adapting Phased Array Antennas for 5G mmWave Systems - RF Cafe"Phased array antennas, traditionally used in aeronautics, defense and satellite communications settings, transmit a signal to a series of coordinated antennas which work together to increase signal strength in a particular direction. Now, the technology is being adapted to meet the needs of service providers looking to leverage high-capacity millimeter wave frequencies for 5G systems. Ian Gresham is a distinguished fellow of technology at integrated circuit firm Anokiwave, which produces highly integrated silicon core IC solutions and silicon front end for millimeter wave applications ..."

Monday 17

Webinar: Technology and Market Outlook for NextGen MilSatComs

Webinar: Technology and Market Outlook for NextGen MilSatComs
Date: July 25, 2017 Time: 8am PT / 11am ET. Sponsored by: Rohde & Schwarz and Wolfspeed Presented by: Asif Anwar. Abstract: Military satellite communications will continue to play an integral part of the C4ISR jigsaw with an emphasis on data / video based communications requiring wider bandwidth and higher linearity pushing the move towards Ka-band while also helping to alleviate the bandwidth constraints at traditional C-band, X-band and Ku-band frequencies. However, next generation 5G terrestrial networks will bring forth new challenges requiring mitigation strategies ...

The AC Volt

The AC Volt - RF Cafe"In the U.S., the DC volt is legally defined by the Josephson array - a super conducting quantum device with a highly repeatable output voltage. (The DC Volt, Nuts & Volts, Jan. '97.) Banks of standard cells and temperature-stabilized Zener diode references are used by the National Institute of Science and Technology (NIST) to calibrate DC meters for scientific and industrial customers. So how is the AC volt defined? As it turns out, there is no 'standard' AC volt in the same way there is a standard DC volt. Instead, the AC volt is defined by conversion to DC and comparison with a DC voltage standard ..."

Axiom Test Equipment July Specials w/Free Shipping!

Axiom Test Equipment July Specials w/Free Shipping - RF CafeAxiom Test Equipment, a provider of efficient and cost effective solutions customers' test equipment needs, offer the following special deals on their inventory. Free ground shipping is offered on all rentals! Axiom offers our customers several practical, efficient and cost effective solutions for their business or projects' test equipment needs. Whether you need to rent & buy test equipment, repair test equipment,, sell or trade equipment, we are committed to providing superior customer service and high quality electronic test equipment ...

Test Your Knowledge of Semiconductors

Test Your Knowledge of Semiconductors, August 1972 Popular Electronics - RF CafeThe August 1972 issue of Popular Electronics included a short quiz by William Shippee titled "Test Your Knowledge of Semiconductors." I guessed wrong on question #2 and guessed right by process of elimination on question #8 (although afterward I discovered that in 2012 I had posted an article about it from Electronics World magazine). Go ahead and try your hand at it. I'll bet Q2 has most people guessing, too ...

IPP Announces Low Capacitance Resistors

IPP Announces Low Capacitance Resistors - RF CafeInnovative Power Products (IPP) is pleased to introduce many new resistor values to their line of Low Capacitance Resistive products. Due to their lower parasitic capacitance, these resistors are perfectly suited as isolation resistors in high power RF combiners / dividers and transistor feedback networks. Our resistors come in standard and custom values to support many applications and typical delivery for standard values is 1 – 2 weeks ...

2D Pseudocapacitors Could Charge in Milliseconds

2D Material Could Make Pseudocapacitors Charge in Milliseconds - RF Cafe"Over two decades ago, researchers at Drexel University identified a new kind of material they dubbed Max phase (the M is for transition metal, the A for "A group" metal, and the X for carbon and/or nitrogen). At the time, the scientists believed the material could serve as a kind of primordial goo from which all things came—it contained all the elements but needed to be organized by scientists. Since 2011, Drexel researchers have been working with an iteration of this Max phase goo called 'MXene.' It was essentially a two-dimensional (2D) material that derived its name from the process of etching and ..."

Sunday 16

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines July 16, 2017For the sake of avid cruciverbalists amongst us, each week I create a new crossword puzzle that has a theme related to engineering, mathematics, chemistry, physics, and other technical words. Clues in this puzzle with an asterisk (*) are pulled from this past week's (7/7 - 7/14) "Tech Industry Headlines" column on the RF Cafe homepage (see Headline Archives page) ...

Friday 14

Communications on a Light Beam

Communications on a Light Beam, April 1972 Popular Electronics - RF CafeSignaling with light goes back to ancient times when militaries and towns communicated with simple encryption methods. Paul Revere relied on lamp light signals (i.e., one if by land, two if by sea). Sailors use(d) signal lamps relay simple messages. Even the Warning Beacons of Gondor were a form of light beam communications (albeit 1 bit -- lit or not lit). To date, the farthest distance over which reliable (at useful data rates) terrestrial communications has been accomplished on a light beam is about 2 miles (3 km). Atmospheric contamination and Earth curvature (line-of-sight with a tiny bit of refraction assistance) are the primary limiting factors. By contrast ...

MFC Radar, Transmit Band & X-Band Reject Filters

Microwave Filter Company Radar, Transmit Band & X-Band Reject Filters - RF CafeMicrowave Filter Company (MFC) continues to provide C-band users worldwide with the largest variety of interference elimination filters within the industry. In addition to our line of filters that reject "close-in" radar and WiMAX signals, we also offer an array of filters that reject undesired transmissions operating up in the higher frequency bands (i.e. – maritime & aeronautical radio navigation bands, X-band and Ku-band). So, whether you need clean C-band reception at your head-end or out on the open water, we have the right interference elimination filter for your application ...

RF & Microwave Magazine Articles for July 2017

A Few Great RF & Microwave Engineering Articles for July 2017 - RF CafeA lot of engineers and technicians who visit RF Cafe design and/or service battery-operated equipment like radios, wearable devices, games and toys, tools, etc. With battery technology advancing quickly, it is important to keep abreast of cell chemistry, packaging, and charge / discharge characteristics. An article by Bob Zollo introduces some of the concepts. Another article introduces yet another filter design approach. After nearly four decades in electronics, I am constantly amazed that there are areas of filter design that have not yet been covered. Items move onto and off of all homepages quickly, so even if ...

Skyworks High-Power Bluetooth PA for Mobile Applications

Skyworks' High-Power Bluetooth® Power Amplifier for Mobile Applications - RF CafeSkyworks has introduced a new product category of high-power Bluetooth® power amplifier solutions for mobile applications targeting Wi-Fi enabled smartphones, tablets and other portable devices. The SKY85018-11 is a highly integrated device that is particularly suited for improving Bluetooth® connectivity ranges, which are required for music streaming. Multiple output power ranges and a bypass mode ensure that the SKY85018-11 is extremely reliable for high performance devices, providing a premium audio experience ...

UK Government Puts £16m into 5G Test Network

UK Government Puts £16m into 5G Test Network - RF Cafe"The government plans to create a mobile comms networks for testing 5G technology to take a lead in the introduction of next generation mobile services. 5G research teams at King's College London and the Universities of Surrey and Bristol will be awarded £16m to develop the 5G test network capable of processing huge amounts of data and supporting applications such as sending virtual reality 3D TV clips to mobile devices. It is hoped the end-to-end 5G trial network will be deployed early next year. It will also be used as part of government plans to introduce autonomous vehicles, robotics, augmented ..."

Thursday 13

FCC to Consider 76-81 GHz Band at Next Meeting

FCC to Consider 76-81 GHz Band at Next Meeting - RF Cafe"While U.S. regulators continue to hear arguments for and against the mandate of Dedicated Short Range Communications (DSRC), the FCC will be taking up a decidedly less heated but somewhat related matter when it conducts its next open meeting on July 13. On the agenda is a Report and Order that would address use of the 76-81 GHz band to support a broad range of vehicular radar uses, such as collision avoidance and adaptive cruise control systems, as well as to expand the types of fixed and mobile radar operations permitted within airport ..."

Color Code Charts

Color Code Charts, August 1972 Popular Electronics - RF CafeHere is one of the most complete component color code charts that I have seen. It covers resistors, capacitors, and inductors for EIA, JAN, and commercial standards. If you are reading this, you have almost certainly memorized the color / number correlation (BBROYGBVGW = 0123456789, respectively) and know how to read a regular carbon resistor's code for resistance and maybe even tolerance. However, if you encounter a capacitor with an array of colored dots or a component with 5 colored bands, are you sure how to read it? This handy-dandy chart will help. Or, you probably have an app on your phone that ...

EMI Shielding Market to Grow to $9.84B by 2025

EMI Shielding Market to Grow to $9.84B by 2025 - RF Cafe"According to a report by Transparency Market Research, the global EMI shielding market is expected to rise to US$9.84 billion by 2025, increasing from US$5.96 billion in 2016 (CAGR of 6.1%). A noticeable trend in the global EMI shielding market is the focus of research and development by savvy companies to grow their shares. They are also resorting to strategic partnerships and mergers and acquisitions to expand their outreach. The global EMI shielding market is choc-a-bloc with players who are seen upping the ante against one another through price, performance, support services ..."

ConductRF Offers Cable Assembly Phase Matching Solutions to 70 GHz

ConductRF Offers Cable Assembly Phase Matching Solutions to 70 GHz - RF CafeConductRF's skill in the manufacturing of Phase Matched RF Cable Solutions is second to none. We have phase matched a diverse array of solutions from Low Frequency RG and LMR Cables to more premium exotic cables up to 70 GHz. With a broad base of standard connectors and cables in stock, we turn solutions around fast. We have solutions across all standard industry interfaces all the way to 70 GHz with 1.85 mm Solutions. We support all variants of SMP/SMPM as well as all common standards including SMA, SMB ...

Imec Eyes New Metals for Interconnect

Imec Eyes New Metals for Interconnect - RF Cafe"On the eve of the annual Semicon West tradeshow here, the Imec research institute described work with new materials, process modules and architectures aimed at alleviating high-density interconnect challenges that loom just down the road for semiconductor manufacturing. At Imec's annual U.S. technology forum here Monday (July 10), Zsolt Tokei, a distinguished member of Imec's technical staff focused on interconnects, explained how chip interconnects are being squeezed ever tighter with continued scaling. As chip dimensions shrink, so too ..."

Wednesday 12

Plans for 1st UK Space Launches Revealed

Plans for 1st UK Space Launches Revealed - RF Cafe"Government moves to promote the UK space industry took shape this week with the introduction of the Space Industry Bill in the House of Lords. The government wants the UK to take advantage of the growing global space industry with multiple micro-satellite launches. The Bill, which was outlined in the Queen’s Speech, represents the UK's commitment to enabling commercial spaceflight from UK spaceports. Lord Callanan, Parliamentary under Secretary of State for Transport introduced the Space Industry Bill, which is a joint initiative by the Department for Transport, UK Space Agency and Civil Aviation Authority supported by ..."

Should We Bring Back Analog Computers?

Should We Bring Back Analog Computers? - RF Cafe"Creation of a single-chip analog / hybrid computer reveals that special analog versions of computers could be used to solve complex problems such as nonlinear differential equations. Just recently, I received a note from Professor Yannis Tsividis of Columbia University, who happened to read a blog I wrote in 2007 on analog computers. In that blog, I ended by saying that 'I sometimes wonder if we shouldn't bring back a modern version of an analog computer.' Professor Tsividis wanted to alert me to the fact that he and his colleagues had done just that. Indeed, they created a single-chip analog / hybrid ..."

Mac's Radio Service Shop: Skeeter Gs and Test Patterns

Mac's Radio Service Shop: Skeeter Gs and Test Patterns - RF CafeOnly John T. Frye can turn an episode of an electronics technician / tinkerer attempting to devise a method of blowing up mosquitoes with sonic waves into a lesson in solving television and radio servicing issues by listening to the audio and interpreting CRT test patterns, as applicable. Mac's young apprentice is introduced to the recently released troubleshooting volumes - called 'Pict-O-Guides' - published by RCA which presents a set of uniquely distorted television test patterns (recall the Indian head test pattern) with an explanation of which circuit likely cased the problem(s) ...

Anatech Intros Highpass, Triplexer, and Bandpass Filters

Anatech Electronics Intros Highpass, Triplexer, and Bandpass Filters - RF CafeAnatech Electronics, Inc. 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. Anatech has introduced 3 new products for your convenience: a 1.5 MHz stripline bandpass filter with SMA connectors; a triplexer filter with N connectors for the 700 MHz, 5400 MHz, 8100 MHz bands; and a 112.5 MHz cavity bandpass filter with type W connectors ...

5G: The Solution to Broadband Infrastructure

5G: The Solution to Broadband Infrastructure - RF Cafe"Small towns and rural areas still do not have adequate internet access, if any at all. But there are multiple efforts in place to solve that problem. Not everyone has access to high speed broadband services. While most of us have had an internet service provider (ISP) for years, those living in small towns and other rural areas still do not have adequate internet access if any at all. But there are multiple efforts in place to solve that problem. And financial assistance from the government in the form of infrastructure grants ..."

Tuesday 11

Saelig Debuts Isolated High Voltage 4-Ch 200 MHz Oscilloscope

Saelig Debuts Isolated High Voltage 4-Ch 200 MHz Oscilloscope - RF CafeSaelig Company has introduced the Cleverscope CS448, a unique isolated high common-mode rejection ratio (CMRR) four-channel 200 MHz 14-bit oscilloscope. It has been designed to measure high voltage, fast slew-rate signals such as those in a full or three-phase power electronic switching bridge (e.g. gate drives to measure voltage and charge, power switching to measure loss and parasitic stress, output signals to measure power and spectrum for EMC compliance, control system signals for gain / phase and stability, etc.) The CS448 includes a built-in isolated 65 MHz signal generator to provide stimulus ...

1st Battery-Free Cellphone Makes Calls by Harvesting Ambient Power

1st Battery-Free Cellphone Makes Calls by Harvesting Ambient Power - RF Cafe"University of Washington researchers have invented a cellphone that requires no batteries - a major leap forward in moving beyond chargers, cords and dying phones. Instead, the phone harvests the few microwatts of power it requires from either ambient radio signals or light. The team also made Skype calls using its battery-free phone, demonstrating that the prototype made of commercial, off-the-shelf components can receive and transmit speech and communicate with a base station. The new technology is detailed in ..."

Minicomputers - What They Are and What They Can Do

Minicomputers - What They Are and What They Can Do, June 1970 Popular Electronics - RF CafeWe do not speak of 'minicomputers' today, but if we did, what would come to mind is not an EIA 19" equipment rack packed full of equipment. Only network servers with teraflops of computing power and/or petabytes of data storage are configured thus these days. 'Minis' in 1972 sported microprocessors that handled 8- or 16-bit words and a whopping 32 kBytes of operating system and program execution memory. FORTRAN, ALGOL, and BASIC were the languages of choice - with no object-oriented code in sight. Don't laugh at the poor slobs of computer yesteryear or congratulate yourself for living in an enlightened ...

Is the Proton Lighter Than We Thought?

Is the Proton Lighter Than We Thought? - RF Cafe"The most precise measurement ever of the mass of the proton suggests that the particle is a tiny bit lighter than the current accepted value. Although the difference is less than one part in 10 billion, it has a statistical significance of 3σ. The measurement was made by Sven Sturm of the Max Planck Institute for Particle Physics and colleagues, who compared the cyclotron frequency of the proton to that of an ionized carbon-12 atom. The particles were held in a Penning trap using magnetic and electric fields. The fields cause a charged particle to follow a looping orbit that is defined by the cyclotron ..."

Anritsu Webinar: 110 GHz Spectrum Analysis in the Palm of Your Hand

Anritsu Webinar: 110 GHz Spectrum Analysis in the Palm of Your Hand - RF Cafe"This webinar will provide a brief overview of spectrum analysis and traditional spectrum analyzers used by engineers and technicians involved in modern RF and microwave communications and demonstrate how Anritsu utilizes its patented non-linear transmission line technology to shatter the cost, size, and performance barriers associated with these traditional spectrum analyzers. Recent technology improvements in semiconductors, components, cable connectors and test equipment are now making it possible for millimeter wave frequencies to be used ..."

High-Speed Communications for the Deep Sea

High-Speed Communications for the Deep Sea - RF Cafe"A new approach to sending acoustic waves through water could potentially open up the world of high-speed communications to activities underwater, including scuba diving, remote ocean monitoring, and deep-sea exploration. Binary data representing the word 'Berkeley' is converted by a digital circuit to information encoded in independent channels with different orbital angular momentum. The transducer array sends the information via a single acoustic beam with different patterns. The colors in the helical wavefront show different acoustic phases. By taking advantage ..."

Monday 10

Triad RF Systems Intros 2.2 to 2.5 GHz, 25 W, Bi-Directional SSPA

Triad RF Systems Intros 2.2 to 2.5 GHz, 25 W, Bi-Directional SSPA - RF CafeTriad RF Systems announces the availability of their TTRM1078D bi-directional solid state power amplifier for UAS radio links utilizing MIMO technology. It is capable of high 20 W output per channel for QPSK operation and 4 W/channel for higher data rate applications such as 64QAM OFDM This class AB LDMOS module is designed for both military and commercial applications. It is capable of supporting any signal type and modulation format, including but not limited to 3-4G telecom, WLAN, OFDM, DVB ...

More Solid-State Electronics for the New Cars

More Solid-State Electronics for the New Cars, April 1972 Popular Electronics - RF CafeIt is well known that American automobile manufacturers really dropped the quality ball in the mid-1970s through about 1990. Foreign car makers were gaining increased access to domestic markets with designs that had more efficient engines and transmissions with superior materials and techniques, and corrosion control was much better than most American cars that often began to exhibit rust bubbles underneath the paint within a year or two - particularly in regions where roadways were salted for controlling ice and snow. People (like me) who bought used cars were leery about a vehicle with more than 70k-80k miles on them because it was almost ...

Many Thanks to 3G Shielding Specialties for Continued Support

3G Shielding Specialties - RF Cafe3G Shielding Specialties offers synergistic solutions incorporating metalwork, conductive elements, microwave absorbers and 3G Shielding Specialties Products - RF Cafethermal transfer solutions in a single, integrated, turn-key package. Application specific and standard product lines. Design services available. Their three primary areas of focus are waveseal enclosure shielding, 3Gmetalworx board level shielding, and wavexorb microwave absorbers. Please visit the 3G Shielding Specialties website now to see whether they can help ...

Is This the 1st Graphene Transistor?

Is This the 1st Graphene Transistor? - RF CafeNote the image is labeled with "S" and "D" (source and drain) along with the symbol for a BJT. "By combining graphene with another two-dimensional material, researchers at Chalmers University of Technology in Gothenburg have created a prototype of a transistor-like device which uses electron spin as the information carrier. Spintronics, as it is called, can result in electronics that are significantly faster and more energy efficient. What the research group at Chalmers University of Technology has demonstrated is that graphene, which is an excellent electrical conductor, also has unsurpassed spintronic ..."

   

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