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Homepage Archive - April 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 April 2017 homepage archives.

 

Thursday 20

Triad RF Systems Intros 5700-5900 MHz, 25W Bi-Directional Amplifier

Triad RF Systems Intros 5700-5900 MHz, 25W Bi-Directional Amplifier - RF CafeThe TTRM1090 GaAs amplifier operates at a frequency range of 5700 MHz to 5900 MHz and has a power output of 25 Watts, while still maintaining a compact form factor of 5.3 x 3.25 x 0.57 inches. This unit also features internal protection against over/under voltage and excessive temperature conditions, which coupled with its rugged construction, ensure fault-free operation in even the most extreme environments. This class A GaAs module is designed for both military and commercial applications. It is capable of supporting any ...

U.S. Radio and Television Stations January 15, 1948

U.S. Radio and Television Stations January 15, 1948, March 1948 Radio-Craft - RF CafeSignificant advances in electronics - and all other kinds of technology for that matter - occurred during World War II, which in conjunction with the U.S. government selling surplus equipment at the end of that war at very low prices, cause a boom in consumer electronics markets. The established radio business and the fledgling television markets were abetted by quickly expanding numbers of broadcast stations. This chart from early 1948 show the number of currently licensed AM, FM, and TV stations, with projections out 20 years to 1968. I don't have ..."

Wireless Device Using Open-Circuit Elements Has No Connections

Wireless Device Using Open-Circuit Elements Having No Electrical Connections - RF Cafe"NASA Langley Research Center has developed a wireless, connection-free, open-circuit technology that can be used for developing electrical devices such as sensors that need no physical contact with the properties being measured. At the core of the technology is the SansEC (Sans Electrical Connections) circuit, which is damage-resilient and environmentally friendly to manufacture and use. The technology uses a NASA award-winning magnetic field response ...

Join Empower RF Systems at the EW Symposium Point Mugu

Join Empower RF Systems at the Electronic Warfare Symposium Point Mugu - RF CafeAs EW warfighting requirements continue to evolve in their complexity and interdependency, it is clear that future EW systems must work collaboratively with other air, ground, surface space and cyberspace systems. The need for multi-purpose, multimode, flexible software defined EW systems is being clearly and widely communicated by the DOD EW community. Empower RF has developed the world's first software definable high power RF amplifiers, an essential element for adaptable multi-mode EW systems. Come visit us to learn more at the Point Mugu Electronic Warfare ...

Pulse Analysis Techniques for Radar and Electronic Warfare

Pulse Analysis Techniques for Radar and Electronic Warfare - RF Cafe"Pulsed signals are widespread in radar and other electronic warfare (EW) applications, and they must be accurately measured for manufacturing, design of countermeasures, and threat assessment. Pulse measurements are an especially challenging area for signal analysis due to a combination of factors. Fortunately, many of the improving signal processing and analog-digital conversion technologies behind the generation of complex pulse environments also enable new techniques for effective pulse analysis. A real-time spectrum measurement of a multi-emitter ..."

Negative Dielectric Constant Material Based on Ion-Conducting Materials

Negative Dielectric Constant Material Based on Ion-Conducting Materials - RF Cafe"NASA Langley Research Center has developed a novel negative dielectric constant material based on ion conducting materials. A negative dielectric constant material is an essential key for creating metamaterials, or artificial negative index materials (NIMs). NIMs have generated great attention due to their unique and exotic electromagnetic properties, and could be used for unique optical and microwave applications, including new methods of electromagnetic cloaking and extremely low loss communications ..."

Wednesday 19

Infineon Joins 5G Automotive Association for Automated Driving

Infineon Joins 5G Automotive Association to Make Automated Driving a Reality - RF Cafe"Infineon Technologies has joined the 5G Automotive Association (5GAA), to contribute towards the creation of a 5G standard for cars. The association is working on the introduction of new communication solutions enabling connected automated driving and on intelligent transport systems. Infineon will provide key 5G technologies required for the autonomous car, and for electromobility. Secure communication with practically zero time delay is a critical requirement ..."

Flexible Memory device Using Oxide Ferroelectric Material

Flexible Memory device Using Oxide Ferroelectric Material - RF Cafe"For the first time, researchers have been able to deposit an ultra-thin oxide ferroelectric film onto a flexible polymer substrate. The research team used the flexible ferroelectric thin films to make non-volatile memory devices that are wearable and resilient. 'Ferroelectric materials are capable of storing charge, which makes them ideal for non-volatile memory devices,' says Jacob Jones, a professor of materials science and engineering at North Carolina State University and co-author of a paper on the work ..."

Why Use a Triac?

Why Use a Triac?, April 1974 Popular Electronics - RF CafeTriacs are not a component often used in RF and microwave circuit design, but being conversant in its operation could make you popular at nerd parties. A triac is basically the equivalent of two SCRs connected back-to-back, allowing it to conduct on both the positive and negative half-cycles of an AC connection. Both devices are most commonly used in switching applications. The unique feature of an SCR and triac is that once the gate voltage is sufficiently high to begin conduction between the anode and cathode, it can be removed and conduction will continue until the anode-cathode voltage is removed ...

Keysight Technologies to Present Vision for 5G Evolution at WAMICON 2017

Keysight Technologies to Present a Vision for 5G Evolution at WAMICON 2017 - RF Cafe"Keysight experts will be at WAMICON 2017 (April 24–25), an annual IEEE Wireless and Microwave Conference, to discuss everything from circuit-level modeling to system verification for general RF, microwave, millimeter wave for 4G, emerging 5G communications, and aerospace & defense. Keysight also will be demonstrating the latest ADS 2016, EMPro and SystemVue software, as well as a range of RF and microwave tools that include the ENA network analyzer, MXG X-Series RF vector signal generator and MXA multi-touch signal analyzer ...

AT&T Debuts 5G Channel Sounder 'Porcupine' with NI

AT&T Debuts 5G Channel Sounder 'Porcupine' with NI  - RF Cafe"The 'Porcupine' is out, and it's making its debut in all its shiny grandeur. Nicknamed 'Porcupine' within AT&T, a new millimeter-wave channel sounder was introduced this week as a first-of-its-kind device. Looking a bit like something that might be walking and talking in a Star Wars movie, the sounder was developed with the help of National Instruments (NI) to capture how wireless signals are affected in a given environment. It can be used to measure how signals reflect off of, or are blocked by, objects like trees ..."

Research Advances Knowledge Classical Theory of Electromagnetism

Research Advances Knowledge Classical Theory of Electromagnetism - RF Cafe"Radio waves, microwaves and even light itself are all made of electric and magnetic fields. The classical theory of electromagnetism was completed in the 1860s by James Clerk Maxwell. At the time, Maxwell's theory was revolutionary, and provided a unified framework to understand electricity, magnetism and optics. Now, new research led by LSU Department of Physics & Astronomy Assistant Professor Ivan Agullo, with colleagues from the Universidad de Valencia, Spain, advances knowledge of this theory. Their recent discoveries have been published in Physical Review ..."

Tuesday 18

Drone-Based Sensor Detects Radio Signals from 20 Miles

Drone-Based Sensor Detects Radio Signals from 20 Miles - RF Cafe"Sensor firm, VStar Systems, has completed a successful flight test of its modular Signal Intelligence Sensor, MA-C/lite, aboard the Martin UAV V-Bat aircraft. Over the duration of 35 minutes at an altitude of 400 feet above ground level, the MA-C/lite sensor collected radio signals from as far as 20 miles, according to VStar. VStar's goal for the MA-C/lite sensor was to build a light-weight signal detector small enough to be carried on UAVs used by military and private security clients. 'Radio detection systems are large. It's hard to find ..."

Call Me KB3UON/AE - Amateur Extra License Exam Passed!

Call Me KB3UON/AE - Amateur Extra License Exam Passed!, Kirt's Cogitations #283 - RF CafeWoo-hoo, I have finally achieved Ham radio license Nirvana! Reporting this on World Amateur Radio Day seems appropriate. On Saturday, April 15, 2017, I passed my Amateur Extra exam in the presence of three VEs at the Wattsburg Wireless Association meeting room in Erie, PA. Nearly 7 years have transpired since I took the Technician test in the same room in 2010. My General license test was taken at the Forsyth Amateur Radio Club meeting room in Winston Salem, NC, in, 2015. Until the FCC updates my record in the online Universal Licensing System (ULS), my call sign will be KB3UON/AE. Motivation for pursuing the Ham radio license goal was ...

Electronics-Themed Comics March 1951 Radio & Television News

Electronics-Themed Comics March 1951 Radio & Television News - RF CafeThe March 1951 issue of Radio & Television News had just two television-themed comics. The first one might have been pushing on the edge of acceptability, but these types of magazines were directed almost exclusively toward men. The easily-offended special snowflake generation was far in the future. Television at that time was building a huge presence in homes worldwide, and there was a huge amount of interest in the technology. It hadn't really been all that long since the public got used to hearing sound (i.e., 'talkies') in the movie theater, so the mystique ...

Notable Tech Quote: John Renshaw Carson

Notable Tech Quote: John Renshaw Carson - RF Cafe"Static, like the poor, will always be with us." - John Renshaw Carson, inventor of single sideband (SSB) modulation. His mathematical analysis 'proved' that frequency modulation (FM) offered no improvement in noise over amplitude modulation (AM). The well-known Carson Rule of FM, BW = 2(Δf + fm), came out of that work. Major Edwin H. Armstrong, a contemporary of Carson's, invented wideband FM, hence rendering the prediction void. The rest, as they say, is history Armstrong also invented the regenerative and heterodyne circuits prior to his FM work.

Russian 'Buzzer' Disappears, Chinese 'Foghorn' Returns

Russian 'Buzzer' Disappears, Chinese 'Foghorn' Returns - RF Cafe"The International Amateur Radio Union Region 1 (IARU-R1) Monitoring System (IARUMS) March newsletter reports that the Russian 'buzzer' on 6,998.0 kHz has disappeared. For a long time the system interfered with the lower edge of the 40-meter band. In addition, a Russian F1B transmission on 7,193 kHz - believed to be emanating from Kaliningrad - has ceased. IARUMS credits German telecoms authorities for submitting complaints and the Russian military. The IARUMS March newsletter further reports that a Chinese ..."

Pasternack 1.0 mm Flexible VNA Test Cables Operate up to 110 GHz

Pasternack Introduces New Series of 1.0 mm Flexible VNA Test Cables Operating up to 110 GHz - RF Cafe"Pasternack, a leading provider of RF, microwave and millimeter wave products, has released four new 1.0 mm flexible VNA test cables that are designed to deliver precision testing results for Vector Network Analyzer (VNA) testing, semiconductor probe testing, automotive radar testing and military radar testing. They are ideal for applications such as test benches, radar, microwave radio and millimeter wave radio. Pasternack's four new high-performance, flexible VNA test cables operate at up to 110 GHz and deliver precise results for testing ..."

Monday 17

GaN RF finFET with High Linearity and Output Power

GaN RF finFET with High Linearity and Output Power - RF Cafe"Nanjing Electronic Devices Institute in China has used fin structures to improve the linearity of aluminium gallium nitride/gallium nitride (AlGaN/GaN) high-electron-mobility transistors (HEMTs) [Kai Zhang et al, IEEE Electron Device Letters, published online 24 March 2017]. The team comments: 'To the best of our knowledge, this is the first demonstration of superior power performance of high-linearity GaN finFETs, indicating significant advantages of tri-gate configuration over planar HEMTs for microwave ..."

NI to Sponsor Microwave Journal Introduction to Radar Webinar

NI to Sponsor Microwave Journal Introduction to Radar Webinar - RF CafeOn Tuesday, April 18, NI/AWR will sponsor a Microwave Journal RF / microwave training webinar titled, "Introduction to Radar." Presented by Scott Bullock, noted researcher and developer of radar simulators and spread spectrum receivers, the webinar covers radar detection and ranging, pulse versus continuous wave applications, radar modulation, radar path budget (basic radar equation), radar range equation, range ambiguity and mitigation, maximum and minimum detectable range and plan position indicator (PPI) and A-scope ...

MDA Information Systems Looking for a Senior RF Engineer

MDA Information Systems Looking for a Senior RF Engineer - RF CafeMDA Information Systems LLC has an immediate opening for a Senior RF Engineer in Reston, VA. This is a full-time customer-site position providing support to a U.S. Government agency. MDA is an industry leader in earth observation remote sensing technology and image processing. We build satellite ground systems that enable users to acquire and process imagery form the most sophisticated Earth-observing satellites in the world: Much of the satellite imagery that you see on Google Maps was generated ...

Model Rectifier Corporation Advertisement

Model Rectifier Corporation (MRC) Advertisement - January 1972 American Aircraft Modeler - RF CafeThis back-page advertisement by Model Rectifier Corporation (aka MRC) appeared in the January 1972 issue of American Aircraft Modeler magazine. Note the cool collection of [now] vintage test equipment shown in support of testing the R/C system. The advertisement shows a rhombic antenna, the Dana 8015 RF frequency counter, Tektronix 7904 oscilloscope, HP spectrum analyzer, RF communications synthesizer RF generator, Anritsu precision field strength meter. I was 13 years old at the time, and anxiously watched for in the mailbox each month ...

Why American Men May Have Less Luck Finding a Job Than Women

Why American Men May Have Less Luck Finding a Job Than Women - RF CafeLOL! Read that headline carefully. Does it mean that American men have less luck finding a job than they do finding women, or that American men have less luck finding a job than women do? You'll have to read the article to find out ...

Diamonds Coupled Using Quantum Physics

Diamonds Coupled Using Quantum Physics - RF Cafe"Diamonds with minute flaws could play a crucial role in the future of quantum technology. For some time now, researchers at TU Wien have been studying the quantum properties of such diamonds, but only now have they succeeded in coupling the specific defects in two such diamonds with one another. This is an important prerequisite for the development of new applications, such as highly sensitive sensors and switches for quantum computers. The results of the research will now be published in the journal Physical ..."

Friday 14

March 2017 Website Traffic Statistics Are Now In

March 2017 Website Traffic Statistics - RF CafeI just ran a report for RFCafe.com's website visitor statistics for March 2017. The trend is going up relative to January's numbers. Nowadays with all the competition coming online, even holding even is considered good, so I'm happy. The chart and table are unaltered from by web hosting service provider (Hostek.com). Dips in the charts are weekends.
• Page Views = 1,674,669
• Visits = 554,806 (17,870 visitors/day)
• Bandwidth = 74,800.5 MB ...

Communications System Laboratory

Communications System Laboratory - RF CafeCommunications System Laboratory offers an integrated approach to communications system teaching. Inspired by his students' expressed desire to read background theory explained in simple terms and to obtain practical computer training, Dr. Kumar has crafted this textbook, ideal for a first course in communication systems. The book merges theory with practical software and hardware applications. Each chapter includes the following components: a brief theory that describes the underlying mathematics and principles, a problem-solving section with a set of typical ...

What Do You Know About Resistors?

What Do You Know About Resistors?, April 1974 Popular Electronics - RF CafeOK, I am ashamed to admit that with just a quick guess I thought Rx in question 6 would be 180 Ω rather than the correct value of 20 Ω. I knew the ratio of 150 Ω to 50 Ω (3:1) would be the same as for 60 Ω to Rx, but stupidly went the wrong way. In order for the bridge to be balanced, the voltage division between the left and right arms of the bridge had to result in the voltages on both sides of the meter to be 0 V. I did manage to get the equivalent resistances of Q8 ...

ConductRF Offering Professional Grade RF Test Cables

ConductRF Offering Professional Grade RF Test Cables - RF CafeConductRF's Site-Flex RF field test cables have been designed to support Handheld RF & Microwave Analyzers. The ruggedized construction includes anti-torque connectors that are firmly attached to the cables external armor. ConductRF offer a various solutions in support of precision Vector Network Analyzer testing. many application focuses. Alternative constructions various by Armor style and flexibility features. NMD Connector heads or adapters are available for most connector configurations ...

Researchers Discover Surprising Property of Glass Surfaces

Researchers Discover Surprising Property of Glass Surfaces - RF Cafe"Researchers at the University of Pennsylvania have developed a new technique to study the surface of different types of glass. Using this technique, they discovered a surprising property of the top layer of glasses, which could pave the way to developing better glass materials. The research was led by Yue Zhang, a graduate student in the Department of Chemistry in Penn's School of Arts & Sciences. Zhang received an APS Padden Award for the research, which recognizes excellence in polymer ..."

Qorvo BAW Accelerates 802.11ax Transition

Qorvo® BAW Accelerates 802.11ax Transition - RF Cafe"Qorvo, a leading provider of innovative RF solutions that connect the world, continues to advance 802.11ax migration as customers implement its recently released portfolio of Wi-Fi front-end modules (FEMs). The company's new 2.4 GHz and 5 GHz FEMs, and bulk acoustic wave (BAW) filters, provide the high throughput and extreme thermal efficiency that are central to high-density 802.11ax Wi-Fi connectivity. Brad Shaffer, senior analyst, Mobile Devices & Networks at IHS Markit, said, 'Qorvo's Wi-Fi FEM and BAW filter products are examples of the RF components which ..."

Bell Correlations Measured in 500,000 Atoms

Bell Correlations Measured in 500,000 Atoms - RF Cafe"Bell correlations - a hallmark of an entangled quantum system - have been spotted in an ensemble of 500,000 rubidium-87 atoms. The atoms were prepared in spin-squeezed states by physicists at Stanford University in the US and the correlations measured to a whopping statistical significance of 124σ. In quantum mechanics, entangled particles have much stronger correlations than are allowed in classical physics - a property that can be exploited in quantum ..."

Thursday 13

IPP-8090: New Surface Mount Dual Directional Coupler

IPP-8090: New Surface Mount Dual Directional Coupler - RF CafeInnovative Power Products introduces their new model IPP-8090, a 200 watt, 32 dB, Surface Mount Dual Directional Coupler that operates from 500 - 3000 MHz. The IPP-8090 is a unique broadband design which provides separate coupled ports for both forward and reflected signals with internal Terminations. This coupler is produced in a Surface Mount (SMD) package size of 1.00 x 1.00 inches. Insertion Loss is less than 0.30 dB, main line VSWR is less than 1.30:1, coupled flatness is +/- 1.0 dB ...

20 Richest Engineers in the World

20 Richest Engineers in the World - RF Cafe"The world's top 20 richest engineers come from a variety of backgrounds. If you search for the highest-paid jobs or what industry will earn you more money you would definitely find engineering at the top of any list. Scroll down and see for yourself - engineers do indeed become wealthy! So who are the top 20 richest engineers in the world? Let's have a look. None of us should be surprised about the STEM revolution that ..."
I might make the 10 poorest list :-(

2 New Vintage Radio Schematics & Parts Lists

Sonora Model TW-49 Radio Service Data Sheet, November 1939 Radio-Craft - RF CafeI have been scanning and posting Radio Service Data Sheets like these featuring the Sonora Model TW-49 radio and Stewart-Warner 03-5A Senior Varsity Radio receivers for many years. There Stewart-Warner Model 03-5A Senior Varsity Radio (RadioAttic.com) - RF Cafeare still a lot of people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. The November 1939 issue of Radio News published these schematics ...

Elma Intros Easy Access Electronics Enclosures

Elma Intros Easy Access Electronics Enclosures - RF CafeElma Electronic has expanded its award-winning iD-Box enclosure line with the iD-Case 18. The new enclosure uses a combination of magnetic connections and hidden screws that provides simple access to internal electronics through an easily removable top panel. This reduces system integration complexity as well as hassles with upgrades and maintenance. Walter Podbelski, Director of E & C Sales for Elma Electronic, noted, 'Electronics systems have moved back room ..."

Map Details Each Country's Biggest Export

Map Details Each Country's Biggest Export - RF CafeSee lots of cool statistics maps by BoA/Merril Lynch. "Ever wonder what your home country exports out to the world the most? What about a neighboring country or political ally? The put together this comprehensive map showing what each country is best known for exporting. The information comes from 2014 data collected by the CIA World Factbook. The map does not include services exported to other countries. The color coded nature of the map lets us visually identify some pretty important global market ..."

Verizon Tests Flying Cell Site for Emergency Preparedness

Verizon Tests Flying Cell Site for Emergency Preparedness - RF Cafe"Verizon conducted its latest engineering flight tests using a 'flying cell site' aboard a drone, and while it didn't share specific results, it's another indication that the carrier is progressing with the prospect of using drones to supply an LTE network if severe weather knocks out more traditional cellular network components. The 17-foot-long drone was piloted by American Aerospace Technologies Inc. (AATI) during the trial run at Woodbine Municipal Airport in Woodbine, New Jersey, on April 5. The test was designed to simulate ..."

Wednesday 12

What's up with Google, Verizon, Nokia 3.5 GHz CBRS Band?

What's up with Google, Verizon, Nokia 3.5 GHz CBRS Band? - RF Cafe"It's somewhat remarkable how far the 3.5 GHz sector has come in one year. The FCC finalized rules for spectrum sharing in the Citizens Broadband Radio Service (CBRS) band in April 2016, making 150 MHz available for mobile broadband and other commercial uses. But before any of that spectrum can be shared, a seemingly complex framework needs to be put into place, one that includes three tiers: one for incumbents, a Priority Access tier and a General ..."

CRFS Unveils MATLAB Toolbox Its RF Spectrum Monitoring Solution

CRFS Unveils MATLAB Toolbox Its RF Spectrum Monitoring Solution - RF Cafe"CRFS, a leader in real-time RF spectrum monitoring solutions, has released its RFeye Toolbox for MATLAB and Simulink. This new feature means that IQ and spectrum data can be imported from RFeye receivers and used with MATLAB signal processing toolboxes and the user’s own signal processing algorithms. MATLAB is used quite widely across the science and engineering world. Many users otherwise unfamiliar with software development are accustomed to using MATLAB in some form. The RFeye toolbox for MATLAB is a valuable resource in addition to CRFS's C ..."

JFW Intros mm-Wave Attenuation Systems for 5G Development & Test

JFW Indrustries Intros Millimeter Wave Attenuation Systems for 5G Development and Test - RF CafeThe 50BA-025-62 2.9MM from JFW is an Ethernet-controlled RF attenuator system specifically developed for testing mm-wave and 5G radios in a laboratory environment. Ultra-wide bandwidth of 100 MHz - 40 GHz and attenuation from 0-62 dB in 1-dB steps makes this system ideal for receiver testing and network emulation of fixed 5G and mobile 5G network components. An easy to use Ethernet/RS-232 interface with front-panel control and standard 2.9 mm RF connectors make ...

Direct Growth of III-V Material on Silicon for 1.55 μm Quantum Dot Lasers

Direct Growth of III-V Material on Silicon for 1.55 μm Quantum Dot Lasers - RF Cafe"Hong Kong University of Science and Technology (HKUST) and Harvard University in the USA have reported progress on direct epitaxy of III-V quantum dot (QD) materials on silicon, producing 1.55 μm microdisk lasers (MDLs). The 1.55 μm wavelength is used in long-distance telecomms over low-attenuation optical fibers. Normally such devices are grown on indium phosphide (InP). Electrically driven III-V quantum dot laser materials on silicon have recently been realized for shorter, non-optimal 1.3 μm wavelengths. Integrating lasers with silicon would allow more compact ..."

A Few Great RF & Microwave Engineering Articles for April 2017

A Few Great RF & Microwave Engineering Articles for April 2017 - RF CafeThe title of the first article listed might have a couple decades ago, had you suspecting it might be some sort of April Fools' gag. After all, who would think there would be any possibility of an oscilloscope performing functions historically reserved for spectrum ... But, then I read Rick chapman's article on transcendental resistors ...

What's the Difference Between Signal Analyzers and Oscilloscopes for Frequency Analysis?, P. Mannion
Transcendental Resistors Simplify Precision Design, R. Chapman
Frog Legs Probably Won't Charge Your Phone, D. Bogdanoff  <more>

World Amateur Radio Day: April 18

World Amateur Radio Day: April 18 - RF Cafe"Every April 18, radio amateurs worldwide take to the airwaves in celebration of World Amateur Radio Day. It was on that day in 1925 that the International Amateur Radio Union was formed in Paris. Amateur Radio experimenters were the first to discover that the short wave spectrum - far from being a wasteland - could support worldwide propagation. In the rush to use these shorter wavelengths, Amateur Radio was 'in grave danger of being pushed aside,' the IARU's history has noted. Amateur Radio pioneers met in Paris in 1925 and created the IARU to support ..."

Tuesday 11

NuWaves Completes IR&D Phase for VHF-UHF 4 W Bidirectional Amplifier

NuWaves Engineering, an international Radio Frequency (RF) and Microwave solutions provider, has completed the Independent Research and Development (IR&D) phase for their miniaturized VHF/UHF RF bidirectional amplifier (BDA), and has finished manufacturing the first 20 units for initial qualification testing and preliminary demo units. The NuPower™ Xtender™ VU4GX02 model features high linearity performance, small size and weight, high adjacent channel leakage ratio (ACLR), broad supply ...

Navy Implements Interferometer-Based Technology EW - RF Cafe"The Navy is implementing enhanced interferometer-based technology that can covertly assess threats and jam enemy electronic systems as part of full production of Block 2 of the Surface Electronic Warfare Improvement Program (SEWIP) for the AN/SLQ-32 electronic warfare (EW) system. Lockheed Martin Corp., Rotary and Mission Systems is conducting the final examination of options regarding the full-rate production of SEWIP Block 2 through a $98.484 million contract ..."

Carl & Jerry: Electronic Eraser

Carl & Jerry: Electronic Eraser, August 1962 Popular Electronics - RF CafeTeenage amateur sleuths, cum amateur radio operators, cum high-tech pranksters, cum serious electronics experimenters Carl Anderson and Jerry Bishop save the day once again with a cleverly devised device for erasing the contents of a tape recording. Their assignment, done at the behest of a secretive government agent, might have been made easier if they had had access to the super-strong rare earth magnets of today since a stereo speaker magnet would not do the job. Instead, the pair was forced to resort to a more challenging solution. As is author Frye's style, he educates you on the workings of tape recorder ...

Triad RF Systems Q2 2017 Newsletter

Triad RF Systems Q2 2017 Newsletter - RF CafeTriad RF Systems has published their 2nd-quarter 2017 newsletter. It includes announcements on 3 new products: An SSPA for CubeSat and NanoSat systems (TA1181), a 40 watt bi-directional amplifier for UAV data and video link applications (TTRM1116), and a dual channel C-band bi-directional amplifier for MIMO r (TTRM1008D). Triad RF Systems will be at the Xponential 2017 show for May 8th-11th, and EDI-CON 2017 for Sept 11th-13th ..."

Please Thank Anatech Electronics for Continued Support of RF Cafe!

Anatech ElectronicsAnatech Electronics manufactures and supplies RF and microwave filters for military and commercial communication systems, providing standard and custom RF Anatech Electronics RF Filtersfilters, and RF products. Standard RF filter and cable assembly products are published in their website database. Custom RF filters designs are used when a standard cannot be found, or the requirements dictate a custom approach. Please take a moment to visit Anatech's website to see how they might be able to assist with your current project ...

T-Mobile Files to Test 3.5 GHz Gear, Sees Band 'Ideal' for 5G

T-Mobile Files to Test 3.5 GHz Gear, Sees Band 'Ideal' for 5G - RF Cafe"T-Mobile USA is asking the FCC for permission to conduct tests in the 3550-3700 MHz band, also known as the 3.5 GHz band, to evaluate the technical performance of pre-commercial Nokia equipment. It’s the latest sign of operators' interest in using the 3.5 GHz band. Last month, Verizon confirmed its interest in deploying small cells—both low power and high power—using the 3.5 GHz / Citizens Broadband Radio Services (CBRS) band, saying it would ..."

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