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Homepage Archive - April 2017 (page 1)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page. About RF Cafe.

Homepage Archive Pages

2023:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

2022:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

2021:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

2020:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

2019:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

2018:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

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

2012:  1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 (no archives before 2012)

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


Monday 10

How Do I Make a Simple Notch Filter for Lab Use?

How Do I Make a Simple Notch Filter for Lab Use? - RF CafeNuWaves Engineering posted this brief tutorial titled, "How Do I Make a Simple Notch Filter for Lab Use?" From the webpage: "Virtually all disciplines apply certain inherited tricks-of-the-trade to expedite tasks. RF engineers and technicians are no different from anyone else... in that respect at least. Oftentimes there is a need for a quick and easy-to-build simple notch filter to improve laboratory measurements. For instance, an RF signal generator's second harmonic can negatively ..."

Lockheed's New System to Protect Assets in Threatened Space Environment

Lockheed's New System to Protect Assets in Threatened Space Environment - RF Cafe"A growing number of satellite system owners and operators need new capabilities to protect their assets and missions in space. To address this requirement, Lockheed Martin has introduced iSpace (intelligent Space), a program that provide defense, civil, commercial, and international customers with sensor data processing, space domain awareness, command and control, and battle management capabilities for the space domain. Space is an important and valuable domain that has changed from a safe environment to one ..."

Capitol Radio Engineering Institute Program Advertisement

Capitol Radio Engineering Institute Program Advertisement, May 1964 Electronics World - RF CafeThe Space Race was at its peak in 1964 when this advertisement by the Capitol Radio Engineering Institute (CREI) Program in Space Electronics appeared in Electronics World magazine. Although it all began in 1957 with the International Geophysical Year, the heat was turned up that year when the USSR successfully launched Sputnik 1, the world's first artificial satellite. President John F. Kennedy made his famous speech before the U.S. Congress in 1961, where he said in part, "This nation should commit itself ...

Carbon Nanotubes Self-Assemble into Tiny Transistors

Carbon Nanotubes Self-Assemble into Tiny Transistors - RF Cafe"Carbon nanotubes can be used to make very small electronic devices, but they are difficult to handle. University of Groningen scientists, together with colleagues from the University of Wuppertal and IBM Zurich, have developed a method to select semiconducting nanotubes from a solution and make them self-assemble on a circuit of gold electrodes. The results were published in the journal Advanced Materials on 5 April. The results look deceptively simple: a self-assembled transistor with nearly 100 percent purity ..."

Skyworks Intros Low-Power, Low-Noise Amplifier for GNSS IoT Applications

Skyworks Intros Low-Power, Low-Noise Amplifier for GNSS IoT Applications - RF CafeSkyworks is pleased to introduce the SKY65623-682LF, an LNA designed for applications such as wearables, asset trackers, navigation devices, action cameras and more. This discrete LNA is optimized to operate from 1559 to 1606 MHz, has a very low current (1 mA @ 1.8 V supply) and single power supply (1.5 to 3.6 V range) for design flexibility and simplicity. The device's broad frequency range covers GPS L1, GLONASS, Galileo and Compass navigation systems and it minimizes external components thereby reducing the bill of materials ...

30th International Marconi Day Event Set for April 22

30th International Marconi Day Event Set for April 22 - RF Cafe"Dozens of official “award stations” have registered to take part in the 2017 International Marconi Day (IMD) event, this year being held on April 22, 0000-2359 UTC (starting on April 21 in US time zones). All contacts counting toward the Marconi Award must be made on HF with registered stations, but other participating stations do not need to be registered to claim awards. This year marks the 30th IMD, held each year to mark the anniversary of wireless pioneer Guglielmo Marconi's birth on April 25, 1874. IMD is ..."

Sunday 9

Friday 7

Akash Systems Debuts GaN-on-Diamond Satellite Technology

Akash Systems Debuts GaN-on-Diamond Satellite Technology - RF Cafe"With worldwide data demand outpacing the frequency, bandwidth and power capabilities of our current communications infrastructure, Felix Ejeckam and Ty Mitchell, both experts in (gallium nitride) GaN-on-Diamond technology have joined forces to create Akash Systems, a company committed to revolutionizing the future of fast, affordable satellite communications. Through the application of GaN-on-Diamond materials, Akash's technologies can resolve issues ..."

2x2 and 4x4 MIMO 120° Sector Panel Antennas for S and C Band Communication

Southwest Antennas' New 2X2 and 4X4 MIMO 120° Sector Panel Antennas for S and C Band Communication - RF CafeSouthwest Antennas, an industry leader in innovative MIMO antenna solutions, is pleased to introduce four new MIMO sector antennas to their existing line-up of directional antenna solutions. The four new MIMO sector antennas feature a wide 120 degree horizontal beamwidth, allowing for wide area coverage. Designed for 2x2 and 4x4 MIMO radio systems, two and four port versions of these sector antennas are offered in both 2.2 – 2.5 GHz S-Band and 4.4 – 5.0 GHz C-Band frequency options, for ISM / broadcast and law enforcement use ...

Electronics-Themed Comics Feb. 1952 & Jan. 1953 Radio & TV News

Electronics-Themed Comics February 1952 & January 1953 Radio & TV News - RF CafeThese three electronics-themed comics that appeared in circa 1952-53 Radio & Television News magazine is good fodder for winding down the week. For some reason the early 50s were a little comic challenged. I originally posted this page a couple years ago, but found another comic I had missed in the same issue. If you enjoy comics like this, there is a growing list of other comics at the bottom of the page you can check out ...

Communications Receivers: Principles and Design - RF CafeHere is a spanking-new book on receiver design by none other than Ulrich Rohde and coauthors Jerry Whitaker and Hans Zahnd. Mr. Rohde is unquestionably one of the single largest contributors to RF communications products and technology in the last many decades, with an immeasurable amount of valuable knowledge worth learning. This c2017, 4th edition covers explore system planning, antennas and antenna coupling, amplifiers and gain control,  filters, mixers, demodulation, digital communication, and the latest SDR technology ...

Astro Aerospace Selected for Inmarsat 6 L-band Antenna Reflectors

Astro Aerospace Selected for Inmarsat 6 L-band Antenna Reflectors - RF Cafe"Astro Aerospace, a Northrop Grumman business, has been selected by Airbus Defence and Space to provide the nine meter L-band mesh reflectors for two Inmarsat 6 satellites. Astro Aerospace has 100 percent on-orbit success since 1958 and provides the most advanced and reliable unfurlable mesh reflector technology on the market. Astro Aerospace's unique AstroMesh® technology is particularly well suited for Inmarsat 6's L-band capacity, which is significantly greater than previous satellites and capable of supporting ..."

Thursday 6

Telewave Transmitter Combiner for Land Mobile and Public Safety Systems

Telewave Introduces Transmitter Combiner for Land Mobile and Public Safety Systems - RF CafeTelewave today introduced the M108-150-XTP-M Series transmitter combiners that deliver very high isolation, low loss, and high RF power handling capability for use in public safety and land mobile radio applications operating between 148 to 174 MHz. The trend toward narrower guard bands between transmit and receive frequencies requires extremely effective filtering to mitigate interference and increase intermodulation suppression between transmitters. Telewave's transmitter combiners are designed to meet these challenges using very-high-Q ...

RF Duplexer Market Segment to Reach $8B in Sales by 2020

RF Duplexer Market Segment to Reach $8B in Sales by 2020 - RF Cafe"According to a new report published by Zion Research, the global demand for RF duplexers was valued at approximately US $4B in 2014. This demand is expected to reach US $8 billion in 2020 with a growth rate of 11% between 2015 and 2020. In terms of volume, the global RF duplexer market stood at around 42 million units in 2014. The report is titled 'RF Duplexer Market for Cellular, Wireless Communication, Military, FO Communication, Consumer and Automatic & Miscellaneous Applications: Global Industry Perspective ..."

Dodging the Weather - With Radar

Dodging the Weather - With Radar, August 1956 Popular Electronics - RF CafeAs with nearly things electronic, innovations in radar systems that were ground-breaking a few decades ago are now available commercially at a small fraction of the cost, a much more compact size, and much greater performance and reliability. Radar operators during World War II noticed that they were able to detect strong rainstorms demonstrating that signals did not necessarily need a metallic object to be reflected strongly enough to be received and processed. Research began soon thereafter to build radars optimized for detecting ...

Triad RF Systems Intros 1.8 to 2.2 GHz, 25 W, Bidirectional SSPA

Triad RF Systems Intros 1.8 to 2.2 GHz, 25 W, Bidirectional SSPA - RF CafeTriad RF Systems has introduced the TTRM1093D LDMOS amplifier operates at a frequency range of 1800 MHz to 2200 MHz and has a power output of 25 watts, while still maintaining a compact form factor of 4.1 x 4.226 x 0.818 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 ...

Chip Industry Outlines Post-CMOS Research Focus

Chip Industry Outlines Post-CMOS Research Focus - RF Cafe"The Semiconductor Industry Association (SIA) trade group Thursday (March 30) set out a comprehensive list of research priorities for maintaining semiconductor technology innovation in years to come, as the era of conventional CMOS scaling draws to a close and engineers turn to new materials, manufacturing techniques, architectures and structures. The SIA released a 73-page report, developed in conjunction with Semiconductor Research Corp. (SRC), which outlines 14 areas identified as key areas ..."

Free Magazine Subscriptions to Qualified Engineers & Technicians

Engineering White Papers & Books, April 2017 - RF CafeWhitepapers, pamphlets, books, magazines, and chapter examples listed here are a small sample of a lot of new items that are offered for FREE through TradePub. The publishers make them available to qualifying people as a promotional campaign for their full line of offerings. Whitepaper topics include careers, manufacturing, and engineering, while magazine titles include Microwaves & RF, Military & Aerospace Electronics, and Microwave Product Digest. Note: I earn a few pennies (literally) when you download one of these or ...

How Did the Proton Get Its Spin?

How Did the Proton Get Its Spin? - RF Cafe"Calculating a proton's spin used to be an easy college assignment. In fact, Carl Gagliardi remembers answering that question when he was a physics graduate student in the 1970s. But the real answer turned out not to be simple at all. Even Gagliardi's "right" response was disproven by experiments a few years later that turned the field upside-down. Protons are one of the three particles that make up atoms, the building blocks of the universe. A proton's spin is one of its most basic properties. Because protons are in part made up of quarks, scientists presumed the proton ..."

Wednesday 5

Anatech Cavity BPF, Coax Cable Assembly, & Custom Filter Design Services

Anatech Electronics Product Update for April 4, 2017 - 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 conveniences: an 1,125 MHz cavity bandpass filter with N type connectors, an SMA female to SMA female cable assembly using LMR-100A coaxial cable, and an an offer to manufacture custom-design filters ...

Must We Have UHF-TV?

Must We Have UHF-TV?, May 1962 Popular Electronics - RF CafeWhen UHF broadcast television was being introduced, pundits - as pundits often do - were quick to predict the rapid, imminent demise of the VHF channels. To wit, "All current VHF stations (operating on channels 2 through 13) may be scrapped, and operations shifted to the UHF band." That was in 1962, when the first experimental UHF station (WUHF) went on-air in New York City. Cited as the reason was a supposed inability for the two bands to co-exist. VHF channels 2-6 are on 54-82 MHz, 7-13 are on 174-210 MHz ...

Webinar: The Impact of Plated Through Hole Vias on RF Performance

The Impact of Plated Through Hole Vias on RF Performance - RF CafeJohn Coonrod, of Rogers Corporation, will present a webinar titled "The Impact of Plated Through Hole Vias on RF Performance" on Thursday, April 6, at 11:00 am EST. Plated through hole (PTH) vias are commonly used for RF Printed Circuit Board (PCB) applications. The use of PTH vias for grounding or repetitive grounding is typically less concerning, however when PTH vias are used to transition a signal trace from one copper layer to another, the via property can have a significant impact on signal integrity. This webinar ...

Quantum Memory Made from Doped Silicon

Quantum Memory Made from Doped Silicon - RF Cafe"Quantum information has been stored in a single atom of phosphorus embedded in a silicon crystal – and then retrieved at a later time. The quantum memory was made by physicists in Australia who say that this kind of memory could be an important ingredient in silicon-based quantum computers with the potential to be more scalable, compact and easier to mass-produce than devices based on rival technologies. Long-term storage in classical computers is straightforward; digital bits are simply copied from the processor to a rotating magnetic ..."

Pasternack IQ Mixers with 4-38 GHz RF and LO Frequency Bands

Pasternack Releases New Line of IQ Mixers with RF and LO Frequency Bands Ranging from 4 GHz to 38 GHz - RF CafePasternack has released six new IQ mixer models with RF and LO frequency bands ranging from 4 GHz to 38 GHz and In-Phase and Quadrature IF bandwidths ranging from DC to 4.5 GHz. Typical applications include point-to-point and point-to-multipoint radio, VSAT, Military Radar, EW, Satellite Communications, sensors, and test and measurement equipment. Pasternack's new IQ Mixer modules are composed of MMIC based assemblies which use a highly reliable GaAs MESFET semiconductor process that consists of a pair of matched ...

Canada Revises Amateur Radio Service Requirements

"The Canadian telecoms regulator has issued a revised list of service requirements for broadcasters. The regulator, Innovation, Science, and Economic Development Canada (ISED), has replaced the 2005 version of the Radiocommunication Information Circular 3 (RIC-3) with an updated edition. The circular is designed to provide guidance for amateur radio users throughout Canada. The new document features numerous significant changes, most obviously the change in name of the organization itself (the ISED was previously known as Industry Canada). The circular provides ..."

Tuesday 4

IC Insights' IC market Growth Forecast >2x

IC Insights' IC market Growth Forecast >2x - RF Cafe"IC Insights has raised its worldwide IC market growth forecast for 2017 to 11% - more than twice its original 5% outlook - based on data shown in the March Update to the 20th anniversary 2017 edition of The McClean Report. The revision was necessary due to a substantial upgrade to the 2017 growth rates forecast for the DRAM and NAND flash memory markets. IC Insights currently expects DRAM sales to grow 39% and NAND flash sales to increase 25% this year, with upside potential from those forecasts. DRAM market growth ..."

"Final" Action in Radio Feed-Back Case

"Final" Action in Radio Feed-Back Case, January 1935 Radio-Craft - RF CafeIf you think controversial and otherwise inane decisions made by high-level courts is something new to this era of political high dudgeon, think again. This January 1935 in Radio-Craft magazine article reports a Supreme Court decision over who was the inventor of regeneration in radio circuits - Lee de Forest or Major Edwin H. Armstrong. Evidently in spite of much support by the opinions of notable experts in the field who claim Armstrong deserves credit, the Court found in favor of de Forest. The battle had been fought at many level for the previous 18 years. Columbia ...

Skyworks Enables Sierra Wireless' HL Series for IoT Applications

Skyworks Enables Sierra Wireless' HL Series for Internet of Things Applications - RF CafeSkyworks Solutions, an innovator of high performance analog semiconductors connecting people, places and things, today announced that Sierra Wireless is leveraging a broad suite of Skyworks' 3G/4G connectivity solutions to power their Sierra Wireless  AirPrime® HL Series modules - RF CafeAirPrime® HL Series wireless modules targeting machine-to-machine (M2M) and device-to-cloud applications. In total, Sierra Wireless is utilizing 17 Skyworks devices spanning high performance multimode, multiband power amplifiers, transmit / receive front-end modules, RF ...

DARPA Battle of the ModRecs Promises Improved Spectrum Management

DARPA Hosted Battle of the ModRecs Lays Groundwork for Improved Spectrum Management - RF Cafe"If human ears could hear the electromagnetic spectrum, the noise levels these days would be overwhelming. The skyrocketing use of wireless devices in military and civilian domains has created a complicated and noisy environment, filled with signals of widely varying frequency and amplitude and a menagerie of modulations. For warfighters trying to maintain critical communications links, interpret ambiguous radar returns, or defend against electronic warfare tactics, the ability to sort through ..."

Please Thank everything RF for Long-Time Support of RF Cafe

everything RFeverything RF has been sponsoring RF Cafe's publication for many years through direct advertising. They have a very wide presence across the Internet on engineering websites. "everything RF is a product discovery platform for RF & Microwave Products/Services." They currently have 203,125 Products from more than 874 Companies across 229 Categories in their database and enable engineers to search for them using the customized parametric search tool. Please visit everything RF now to see how they can help your project ...

NATO to Boost Satellite, Communications Spending

NATO to Boost Satellite, Communications Spending - RF Cafe"Largely unnoticed amid the Trump administration's proposed military buildup and claims that NATO members are not paying their fair share, there are reports the western alliance plans to spend more than $3.2B to upgrade satellite communications and the computer infrastructure in Europe used for command and control of air and missile defenses. According to several reports out of Brussels citing senior NATO officials, the alliance plans to invest more than $1.83B over the next three years on satellite communications upgrades. The new satellite networks would support troops, ships and ..."

New Bands! FCC Issues 630 and 2,200 Meters to Amateur Radio Service

New Bands! FCC Issues Amateur Radio Service Rules for 630 Meters and 2,200 Meters"It's been a long time coming, but the Amateur Service will get two new bands in the near future. The FCC on March 28 adopted rules that will allow secondary Amateur Radio access to 472-479 kHz (630 meters) and to 135.7-137.8 kHz (2,200 meters), with minor conditions. The FCC Report and Order (R&O) spells out the details. It allocates 472-479 kHz to the Amateur Service on a secondary basis and amends Part 97 to provide for Amateur Service use of that band as well as of the previously allocated 135.7-137.8 kHz band. The R&O ..."

Monday 3

1-Watt Short-Wave Transmitters Used in Germany

1-Watt Short-Wave Transmitters Used in Germany, September 1935 Short Wave Craft - RF CafeGermans have long been on the cutting edge of technology and the fine arts. Much of the world's best music, art, timepieces, engines, aircraft, guns, and other devices have emanated from there. Notables like Einstein, von Braun, Heisenberg, Planck, Gauss, Kepler, Helmholtz, Kirchhoff, Hertz, and Fraunhofer - all German - are almost certainly familiar to all RF Cafe visitors. This article demonstrates the voraciousness with which the Germans sought to engage in science exploration. It is very unfortunate for the German people that a couple maniacs like Wilhelm II and Adolph ...

April Fools' Gags That Missed the Mark

April Fools' Gags That Missed the Mark - RF CafeDid you catch the two April Fools' Day articles from vintage electronics magazines that I posted on Friday (here and here)? Here is an item in today's news: "The Internet is a minefield on April 1, with tech companies getting in on the April Fools' act in weird, wonderful and often woeful ways. The line between a successful prank and one that leaves users sighing, or worse, is micron-thin, and the boost to one's reputation -- or knock on it -- can hang around for ..."

Air Could Be World's Next Battery

Air Could Be World's Next Battery - RF Cafe"Wind and sun, two unpredictable resources, are becoming ever more important as sources of energy in Europe. This means that we face a growing need for energy storage facilities, because if energy cannot be used immediately when it is generated, it needs to be stored until it is needed. The least expensive method is to use hydropower reservoirs as 'batteries': i.e. generate electricity using the stored water, when power is in short supply, and subsequently pump the water back ..."

Whitepaper: Multi-Tone Testing, Theory and Practice

Multi-Tone Testing, Theory and Practice - RF CafeAmplifier Research Corp. has a nice whitepaper available for free download titled "Multi-Tone: Testing, Theory and Practice." It is a fairly in-depth guide to prediction and measurement of intermodulation products caused by multiple tones at the system input. Transmitter designers are concerned with intermod products from a spectrum compliance standpoint and receiver designers are concerned with intermods from a signal integrity standpoint ...

6 New Vintage Radio Schematics & Parts Lists

6 New Vintage Radio Schematics & Parts Lists - RF CafeMagazines usually provided at least a brief description on the circuit functionality for each of the radio models presented in schematic format. The April 1947 issue of Radio News published schematics and parts lists for six sets, including this for the Air King Model 4604D, but not a word about any of them accompanied it. The thumbnail ...

- Air King Model 4604D

- Radiola Models 61-6, 61-7

- Sparton Models 526, 526X, 526PS

- Truetone Model D2624

- Stromberg-Carlson Models 1020,

    1120, Series 10

- Westinghouse Models H-104,

    H-105, H-107, H-108

How to Outwit Noise in Quantum Communication

How to Outwit Noise in Quantum Communication - RF Cafe"How to reliably transfer quantum information when the connecting channels are impacted by detrimental noise? Scientists at the University of Innsbruck and TU Wien (Vienna) have presented new solutions to this problem. Nowadays we communicate via radio signals and send electrical pulses through long cables. This could change soon, however: Scientists have been working intensely on developing methods for quantum information transfer. This would enable tap-proof data transfer or, one day, even the linking of quantum computers ..."

Sunday 2

RF Cafe Engineering Crossword w/Weekly Headlines April 2, 2017

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines April 2, 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 (3/27 - 4/2) "High Tech News" column on the RF Cafe homepage. ...


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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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