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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

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 ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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"This 'telephone' has too many shortcomings to be seriously considered as a means of communication." - Western Union"

Today in Science History

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 ...

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 ..."

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 ...

$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 ...

Job Search Advice Articles for March

Engineering Career and Job Hunting Advice for March 2017 - RF CafeThe vast majority of advice columns on job searches recommend strategies to job seekers while participating in an interview; however, "Choosing an Interview Style and Format," by Will Zimmerman of CareerCast, covers the other side of the interview. His article discusses ways you as an interviewer might consider to most effective tactic ...

- How to Negotiate Salary in
    Engineering Job Interviews
- Key Phrases to Use When You
    Talk to Your Boss
- Choosing an Interview Style
    and Format  <more>

Thanks to Antenna Test Lab Co for Continued Support!

Antenna Test Lab Co logoSince 2001, Antenna Test Lab Co has evaluated countless antennas and RF transmitter products. With a fully anechoic Antenna Test Lab Co Anechoic Chamber - RF Cafechamber, antennas can be quickly developed and RF products refined and deployed. Mounting surfaces like drywall, glass, wood, and even curved metal Antenna Test Lab Co 2D & 2D Patterns - RF Cafesimulated automobile available. The price for a standard resolution 2D or 3D field pattern plot is only $450 - for a passive or radiating antenna. That is an incredible deal!

International Wireless Communications Expo 2017 - March 27-31

International Wireless Communications Expo 2017 - RF Cafe"It's our 40th anniversary! Taking place March 27-31, 2017 in Las Vegas, IWCE 2017 is a venue where people can make the human connections they need to be successful, whether it is connecting to a future client, boss, employee or business partner. It is also where people can connect to information about a technology, product or policy that is crucial to success. See innovation at its best and join us for the premier event for communications technology ..."

An Introduction to Electromagnetic Compatibility

An Introduction to Electromagnetic Compatibility by API - RF CafeAPI Technologies has published a white paper titled An Introduction to Electromagnetic Compatibility. "By definition, Electromagnetic Compatibility (EMC) describes the ability of a system, a piece of equipment, or some other electrical device that utilizes electromagnetic energy, to operate in its intended environment without suffering an unacceptable degradation in its performance, or negatively impacting the ability of another device to perform its intended function. This paper is ..."

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.

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 ..."

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 ..."

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 ..."

Pasternack mm-Wave Tx Module for 60 GHz Global Unlicensed Spectrum

Pasternack Debuts Millimeter Wave Transmitter Module Covering the 60 GHz Global Unlicensed Frequency Spectrum - RF CafePasternack has released the PEM010, a complete millimeter wave transmitter module that is ideal for use in the development of multi-gigabit, high-speed, point-to-point wireless communication links. These communication links provide low-cost, gigabit wireless throughput for a variety of applications involving telecommunications 'last kilometer' distribution, telecommunications cellular backhaul, millimeter wave wireless gigabit Ethernet data communications, building-to ...

Texas Symposium on Wireless and Microwave Circuits and Systems

Texas Symposium on Wireless and Microwave Circuits and Systems"The Texas Symposium on Wireless and Microwave Circuits and Systems conference committee invites paper submissions for the 2017 conference, to be held on the beautiful campus of Baylor University in Waco, Texas, on March 30-31, 2017. Authors from the industry and academia worldwide are invited to submit four-page papers of their original and previously unpublished work. Paper submissions in all areas of wireless and microwave circuits and systems are welcome. Topics of interest include: • RF and microwave circuits and systems ..."

Fractus Antennas Pitches New “Antenna-less” Smartphone Technology

Fractus Antennas Pitches New “Antenna-less” Smartphone Technology - RF Cafe"A tiny company based in Barcelona is promoting a new technology that it hopes can revolutionize smartphone antennas - by removing them altogether. The job of any smartphone antenna is to radiate a radiofrequency signal generated by the phone's transmitter out to the nearest cellular base station or Wi-Fi router. Now, Fractus Antennas wants to replace that antenna with a much smaller component called an antenna booster—a tiny lightweight cube ..."

Engineering Specialist 2 Wanted by Harris Space & Intelligence Systems

Engineering Specialist 2 Wanted by Harris Space & Intelligence Systems - RF CafeHarris Space & Intelligence Systems is looking for an Engineering Specialist at its Palm Bay, Florida location to provide technical support to the RF & Microwave Engineering Department and support department labs. Projects/tasks will vary depending on program requirements. Job duties will require skilled workmanship, integration, testing, and ability to follow verbal and written instructions. Complexity of tasks will increase with time in position ...

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

FAA Eases up on Electronic Devices on Flights

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

Motorola Solutions Sues Hytera Communications, Alleging Patent, Trade Secrets Theft

U.S. Companies Still Hold Largest Share of Fabless Company IC Sales

Everything You Need to Know About Quantum Computers

SEMI February Billings up 6% on January

2-Way Radio on Single Chip w/o Filters Developed

2-Way Radio on Single Chip w/o Filters Developed - RF Cafe"Two-way communication requires, of course, both send and receive capabilities. But putting them in the same device requires a filter between the send and receive circuits to provide signal isolation. Without a high performance filter, communication would be impossible. Researchers in Cornell University's Molnar lab have devised a method for both transmitting and receiving a radio signal using a single chip without the use of a filter. This technology could potentially change the way wireless ..."

Beauty and Broadcasting

Beauty and Broadcasting, April 1945, Radio-Craft - RF CafeAM radio station WISE, in Asheville, North Carolina, today is an ESPN sports broadcasting entity, but until 2004 it was a Top 40 type music format. It gained notoriety in World War II for being the first commercial broadcast station whose entire staff of radio engineers was comprised of women. As reported in a 1945 issue of Radio Craft of chief engineer Madeline Halleuth, "...she speaks the language of crystal-controlled frequencies, water-cooled transmitting tubes, condensers, coils, and carries her position with the ease of a veteran radio technician." While America's ...

Swedish Regulator Rejects Entry Level Amateur Radio License

Swedish Regulator Rejects Entry Level Amateur Radio License - RF Cafe"Sweden's telecoms regulator PTS in February rejected the idea of an entry-level Amateur Radio license. According to Sweden's International Amateur Radio Union (IARU) member society SSA, the PTS 'categorically rejected' the proposal, and that SSA must now find new ways to motivate prospective radio amateurs. 'Amateur Radio's future in Sweden is an urgent issue that will be discussed during the upcoming annual meeting on Faro,' SSA said. The SSA estimates that fewer than 100 new licensees are joining the Amateur Radio ranks in Sweden each year ..."

Reduced Footprint Wilkinson Power Divider w/EM Verification Using NI AWR

Application Example Describes How to Design a Reduced Footprint Wilkinson Power Divider with EM Verification Using NI AWR Software - RF CafeA new application example describes the steps used to design a microwave Wilkinson power divider using ideal transmission lines, microstrip implementation, physical design, and circuit compaction. The entire project is done in NI AWR Design Environment, specifically Microwave Office circuit design software, from schematic entry to physical printed circuit board (PCB) implementation, ACE™ automatic circuit extraction ...

Flann Microwave Celebrates 60 Year of Success

Flann Microwave Celebrates 60 Year of Success - RF CafePioneering microwave engineering company Flann Microwave has celebrated 60 years of success by looking to the future with an investment in a new coordinate measuring machine (CMM) to further enhance the precision manufacturing and testing of its market leading waveguide and calibration technology. With a 60-strong team based in Bodmin, Cornwall, UK, Flann has grown over six decades to secure a global reputation for innovation and the production of precision microwave and millimeter ...

RF Cafe Engineering Crossword Puzzle with Weekly Headlines

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines March 19, 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 (3/13 - 3/17) "High Tech News" column on the RF Cafe homepage (see the Headline Archives page for help) ...

The Theory and Construction of Attenuators and Line Filters

The Theory and Construction of Attenuators and Line Filters, August 1932 Radio-Craft - RF CafeThis is the third and final installment of Hy Levy's series on attenuators, line filters, and matching transformers. Audio and low IF frequencies are used in the examples, but the formulas and principles can be extended to higher frequencies. Bifilar windings are covered as a method of minimizing self-inductance in wire-wound resistors. Although inductance is not desired in resistors, bifilar windings can also be connected to have current in both wires flowing in the same ...

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