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Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Kirt Blattenberger,

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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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Today in Science History

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines March 26, 2017

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines March 26, 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 (3/20 - 3/24) "High Tech News" column on the RF Cafe homepage (see the Headline Archives page for help). Enjoy! ...

Craftsman Tools Sold to Stanley Black & Decker

Craftsman Tools Sold to Stanley Black & Decker - RF CafeAnother chapter in American tradition has come to an end. Sears Roebuck is likely going into bankruptcy and then disappear - thanks to poor management. Fortunately, the Craftsman tool line has been sold to Stanley Black & Decker, so at least part of the legacy will live on. Most of my tools are Craftsman - motivated mostly by tradition and a desire to support American companies. Plans call for establishing new Craftsman manufacturing facilities stateside. BTW, the Sears store here in Erie closed last November. Boscov's, a Reading, PA-based department store chain ...

Electrocrystallization: Breakthrough in Gold Nanoparticle Research

Electrocrystallization: Breakthrough in Gold Nanoparticle Research - RF Cafe"A research team as published a research study that demonstrates how it is possible to obtain very high quality crystals formed of gold nanoparticles. The research on gold nanoparticles is a field of both fundamental and applied importance" explains Academy Professor Kari Rissanen of the Department of Chemistry at the University of Jyväskylä. X-ray crystallography is the most powerful method for molecular-structure determination of these nanosystems, but obtaining good quality single crystals suitable for accurate X-ray ..."

Millimeter Wave Wireless Communications

Millimeter Wave Wireless Communications - RF CafeIn Millimeter Wave Wireless Communications, four of the field's pioneers, including Theodore S. Rappaport, Robert W. Heath, Robert C. Daniels, and James N. Murdock, draw on their vast experience to empower engineers at all levels to succeed with mmWave. They deliver fundamental, end-to-end coverage of all aspects of future mmWave wireless communications systems. The authors explain new multi-Gigabit per second products and applications, mmWave signal propagation, analog and digital circuit design, mmWave antenna designs ...

Anokiwave Needs a Senior Test Engineer

Anokiwave Needs a Senior Test Engineer - RF CafeAnokiwave is a fast growing fabless semiconductor company looking for an ambitious, conscientious, and thorough Senior Test Engineer to join the Anokiwave team in Billerica, MA. The ideal candidate should possess a strong working knowledge of mmW measurements, calibration methodologies, semiconductor probing, and python script language. You will play an instrumental role in the growth and excellence of Anokiwave and our commitment to satisfying our customers. The successful candidate should demonstrate proven ...

4G and 5G to Change the RF Front-End Industry Landscape

4G and 5G to Change the RF Front-End Industry Landscape - RF Cafe"According to a recent report by Yole Group of Companies, the RF front end modules and components market for cellphones is expected to grow from $10.1B in 2016 to approximately US $ 22.7B by 2022. The investigative report based on the front-end of the RF industry not only reports of a complex market that will more than double in six years but also states the growth to be un-evenly distributed and with something or the other for every market player. The group proposed two reports ..."

Unexpected, Star-Spangled Find May Lead to Advanced Electronics

Unexpected, Star-Spangled Find May Lead to Advanced Electronics - RF Cafe"This tiny US flag - just a few nanometers wide and invisible to the naked eye - is arguably the world's smallest image of Old Glory, according to its creators at the University of Texas at Dallas. In an experiment, the nanoflag pattern emerged unexpectedly as sheets of the 'stripe' material - molybdenum ditelluride - were heated to about 450 degrees Celsius, at which point its atoms began to rearrange and form new structures - the 'stars' in this false-color image. Each star consists of six central ..."

Startup Funding Gets Scarce As Investors Grow Cautious

Startup Funding Gets Scarce As Investors Grow Cautious - RF Cafe"Has the tech bubble peaked? Signs that the startup boom may be fizzling. Startups are beginning to run out of money and investors are becoming more discerning. How does this compare to the time leading up to the dotcom crash? If you were looking for an apartment in the Bay Area 18 months ago, realtors recommended you took your checkbook to viewings and were prepared to fork out for the deposit and first month's rent – that's $8,000 to $10,000 for a two-bedroom place in San Francisco – on the spot ..."

What Wives Think About Ham Radio

What Wives Think About Ham Radio, December 1966 QST - RFCafeWhen I first as the title of this article, I thought it was going to be a comical parody on how wives (YLs) of Ham radio operators (OMs) viewed their husbands' hobby. It turned out to be a report on a nationwide survey. Many of wives of Hams were themselves licensed operators which, at the time, required Morse code proficiency in addition to radio theory and regulations. In 1966 the average cost of a Ham shack layout was about $1,000, which is equivalent to $7,518 in 2017. As with most electronics ...

VidaRF Announces RF Power Dividers

VidaRF Announces RF Power Dividers - RF CafeVidaRF offers a wide selection of 2-way through 64-way power divider/combiners, designed to cover 100 MHz to 20 GHz with average power handling of 30 watts for narrow, octave, dual and multi-octave band applications. Standard connector type: SMA female, other connectors available upon request. VidaRF is a North Carolina based company that is focused on being a solutions provider by building to customer specs and offering zero days lead time for custom parts through ...

IMS2017 Student Design Competition Winners to Be Gifted NI AWR Software

IMS2017 High-Efficiency Power Amplifier Student Design Competition Winners to Be Gifted NI AWR Software - RF CafeNI (formerly AWR Corporation) continues to proudly sponsor this year's 2017 IEEE International Microwave Symposium (IMS) thirteenth annual High-Efficiency Power Amplifier Student Design Competition (HEPA-SDC). The competition encourages student teams from around the world to design and construct a power amplifier (PA) and bring it to IMS in Honolulu, Hawaii, where industry experts will evaluate the performance of all entered PAs ...

Chip Fabrication for Top Military Electronics

Chip Fabrication for Top Military Electronics - RF Cafe"U.S. military microelectronics experts are looking to GlobalFoundries U.S. 2 LLC in Hopewell Junction, N.Y., to continue providing foundry and electronic chip fabrication services for crucial U.S. military electronics systems. Officials of the Defense Microelectronics Activity (DMEA) in McClellan, Calif., announced a $99.8 million contract modification to GlobalFoundries on Friday for option year one for access to leading edge, current, and legacy microelectronics and trusted processes for the U.S. Department of Defense (DOD) ..."

Triad RF Systems Intros 2.3 to 2.5 GHz, 25 W, Bidirectional Amplifier

Triad RF Systems Intros 2.3 to 2.5 GHz, 25 W, Bidirectional Amplifier - RF CafeThe TTRM1004-D01 LDMOS amplifier operates at a frequency range of 2300 MHz to 2500 MHz and has a power output of 25 watts, while still maintaining a compact form factor of 3.33 x 2.69 x 0.65 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 AB LDMOS module is designed for both military ...

Therapeutic Radio, by Marek Klemes

Therapeutic Radio, by Marek Klemes, Kirt's Cogitations #282 - RF CafeIs this an über-cool homebuilt radio or what? Proud Canadian and RF Cafe contributor Dr. Marek Klemes wrote to me a couple weeks ago regarding a quotation I had posted a while back. At the end of our communications, he casually made a comment about needing to engage in an electronics project that would be free of the rigors of his professional pursuits. Being a trained notable quote recognizer myself, I instantly realized that his statement was itself worthy of being quoted widely. He granted permission to post it here (with adornment of ...

everythingRF Has Largest Database of Bias Tees on the Internet

everything RF Has Largest Database of Bias Tees on the Internet - RF Cafeeverything RF has created the largest database of Bias Tees on the internet. We have listed products from 28 of the leading manufacturers at the moment. We are currently working on adding more manufacturers. Product data from each company has been standardized and listed in a single database which can be searched by parameter. You can enter the frequency range of the Bias Tee you need, the voltage it must withstand, the insertion loss, impedance and connector type. Once you enter the required specification ...

3D Insider - Resources for the 3D Printing Industry

3D Insider Printer Resources - RF Cafe3D Insider is all about giving you the tools and information to create whatever your heart desires with a 3D printer. If you are looking to make a MakerBot 3D Printer - RF Cafefull time career out of 3D printing or you are just looking for a new hobby, 3D Insider has it all for you. 3D printing has been growing at a tremendous pace and we love working in such a fast-paced industry. 3D Insider has been added to RF Cafe's 3D Printers and Fabrication resources page.

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

European Share of Fabless Chip Market Halves to 1%

Record Spending for Fab Equipment Expected in 2017 and 2018

Peregrine Semi Buys MIT Spinoff Arctic Sand

ARRL Reiterates Its Case for New Band at 5 MHz

Keurig to Pay $6M for Failing to Report Defective Coffee

Maritime Radio Day Event Set for April

Trump Bump Military Budget Ups Defense Spending

China Fab Boom Fuels Equipment Spending Revival

FCC Issues Temporary Waiver Order Regarding Caller ID

How Do We Hear?

How Do We Hear? Part II, June 1936 Radio-Craft - RF CafeA story in an electronics magazine on the physics and biology of the human ear is as relevant today as it was in 1936 when this appeared in Radio-Craft. Back then, creating sound in an efficient and effective manner for consumer, commercial, and military purposes was a relatively new science. Thomas Edison introduced his phonograph in 1877. While it did not feature an electrically driven speaker, research determined the shape, size, and material composition of the mechanism that converted minute vibrations ...

Facebook Seeking Top EE to Help It Cross into Consumer Electronics

Facebook Seeking Top EE to Help It Cross into Consumer Electronics - RF Cafe"Who's the next Jon Rubinstein? For millennials that name might not ring a bell. Rubinstein was the 'podfather': as head of hardware engineering at Apple he launched and ran the project that became the iPod, the product credited from turning Apple from a computer company into a consumer electronics company. Facebook, it seems, would very much like to make a similar leap into consumer hardware. So they need lots of good engineers - including an EE 'podfather.' Right ..."

Disruption of Satellite Navigation Systems Due to Northern Lights

Research Analyzes Disruption of Satellite Navigation Systems Due to the Northern Lights - RF Cafe"Researchers at the University of Bath have gained new insights into the mechanisms of the Northern Lights, providing an opportunity to develop better satellite technology that can nullify outages caused by the natural phenomenon. The research team from the University of Bath's Department of Electronic & Electrical Engineering in collaboration with the European Incoherent Scatter Scientific Association (EISCAT) observed the Northern Lights in Tromsø ..."

Bonding SMT Components via Inkjet Printing

Bonding SMT Components via Inkjet Printing - RF Cafe"Noting that today's additive manufacturing and roll-to-roll processes for flexible electronics still lack the adequate materials and level of precision to do without discrete surface mount devices (SMD), researchers from the University of Barcelona have investigated the possibility to replace the screen-printing of reflow solder pastes, epoxies or other conductive adhesives with direct inkjet printing of a silver-based ink. They describe their ..."

PMI Intros 10-Bit Programmable PIN Attenuator and a Bandpass Filter

Planar Monolithic Industries (PMI) Intros 10-Bit Programmable PIN Attenuator and a Bandpass Filter - RF CafePlanar Monolithic Industries (PMI) recently introduced two new products in their extensive line of RF and microwave components. One is a 10-bit programmable, 30 dB PIN diode attenuator covering 26.5 to 40 GHz. The other is a suspended substrate bandpass filter that offers a wide passband of 8 to 18 GHz. Contact PMI today for more information ...

Quantum Movement of Electrons in Atomic Layers

Quantum Movement of Electrons in Atomic Layers - RF Cafe"Common sense might dictate that for an object to move from one point to another, it must go through all the points on the path. Not so for electrons in the quantum world, which don't follow such common-sense rules for the most part. 'Electrons can show up on the first floor, then the third floor, without ever having been on the second floor,' Zhao said. 'In a sample made of three atomic layers, electrons in the top layer move ..."

$5.00 For Best Short-Wave Kink, June 1935 Short Wave Craft

$5.00 For Best Short-Wave Kink, June 1935 Short Wave Craft - RF CafeHere for radio hobbyists are eleven handy-dandy 'kinks,' otherwise known as tricks, shortcuts, or clever ideas, that could prove useful while working in the lab at work or in your shop at home. Admittedly, most of these ideas would not have much application with today's ready-made radios, antennas, power supplies, etc., but there are still people who build custom equipment and/or repair circuits. The most useful kink offered here that could come in handy for anybody is to clip off part of ...

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