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- RF Cafe Homepage -
RF, Microwave, Wireless, Cellular, Radar, Satellite, & Analog Engineering

Today in History - 1752: French mathematician Adrien-Marie Legendre, who introduced the Legendre Polynomials, was born. 1783: Leonhard Euler, very familiar to all engineering students...

Tech Headline News

-  Archives -

Scientists Twist Radio Beams to Send Data

First Formula E Race Shockingly Electrifying

New Device to Catch Texting Drivers

1,000,000,000 Websites and Growing

Wirelessly Routing Drivers Around Congested Roadways

Twisted Graphene Chills Out

Are Cell Phones Really Giving Us Cancer?

Consumers Expect Full in-Car Connectivity

• Ultrafast Charge Separation in Metal Dichalcogenide Heterostructure  • Sony Increases Loss Forecast to $2.14B

AMSAT-NA Announces Board of Directors Election Results

A Zero-Friction Quantum Engine

DARPA and Lockheed Testing Laser Turrets on Planes

Drivers Warned over Smartwatch Use in Cars

Hackers Lock up Thousands of Australian Computers, Demand Ransom

Venture Capitalist Sounds Alarm on Startup Investing

Engineers Make Great Comedians

Non-citizen Income in U.S. Increased 6% YoY While Legal Citizens' Increase = 0% (see p5 Highlights of Census report)

The Future Face of Molecular Electronics

Phase-Adjustable Connectors for up to 18 GHz

Elusive Quantum Transformations Found Near Absolute Zero

RF Design/Wireless Position Available at Kenall

Electrical Engineer, RF Design/Wireless Position Available at Kenall - RF CafeThe successful electrical engineer candidate will be responsible for the development and design of wireless control systems which will be used in Kenall lighting, emergency and signage products. The Ideal candidate will have experience using WLAN, ZigBee, Bluetooth, low-voltage control and switching circuits. Kenall products are proudly manufactured in the USA.

Many New Titles Added to Book Drawing List

Electronic Warfare Receivers and Receiving Systems - RF CafeSatellite Communication Ground Segment and Earth Station Handbook - RF CafeUltrawideband Antennas for Microwave Imaging Systems - RF CafeAdvances in Statistical Multisource-Multitarget Information Fusion - RF CafeThanks the incredible generosity of Artech House publishers, there are now many new engineering books available for selection to the monthly RF Cafe Book Drawing winners. The four shown here are among seven new titles.

Carl & Jerry: Electronic Detective

Carl & Jerry: Electronic Detective, February 1958 Popular Electronics - RF CafeLong before their college days at Parvoo U., our two amateur electronics sleuthing buddies were on the job tracking down and trapping bad guys by using their combined knowledge of circuits and physics. In this episode, Carl and Jerry are tasked with helping a hobby store owner stop a rash of thefts that always seems to occur during a busy time right after school lets out for the day. Their first inclination was to devise a system like the big department stores were installing that used passive tags on items that would trigger an...

everythingRF Updates Cable Assembly Builder

everythingRF Updates Cable Assembly Builder Tool - RF Cafeeverything RF has updated its Cable Assembly Builder tool to help users get quotations from over 25 manufacturers at one go. Users can specify their requirement and select the manufacturers from whom they would like to get a quotation. The tool has been optimized for mobiles, tablets and desktops allowing users to access this from anywhere. Try it out.

Applications Engineer Needed by Empower RF

Applications Engineer Needed by Empower RF Systems - RF CafeEmpower RF Systems is looking for an Applications Engineer. Key responsibilities and deliverables include: Partner with sales, engineering, business development, and executive management to identify and close on power amplifier solutions for key markets and customers. Provides sales personnel with technical support for the promotion and positioning of existing and new products. Responsible for inputs to marketing plans, development of sales tools, and selected, web content preparation. Provides customer feedback to improve existing products...

Notable Tech Quote

1 to the 4th Power Amplification in Star Trek Episode - RF Cafe"By installing a booster we can increase that capability on the order of one to the fourth power." - Captain James T. Kirk, Commander of the Star Ship Enterprise. While Melanie and I were watching the Star Trek original television series episode titled "Court Martial," I picked up on a funny technical faux pas. Kirk is accused of the negligent death of a crew member with whom he has had a longtime difficult relationship. Believing that the man is faking his own death to incriminate him, Capt. Kirk has the ship's auditory sensors boosted...

Radio WittiQuiz

Radio Wittiquiz, October 1938 Radio Craft - RF CafeMixing a little fun with learning has always been a good motivation for students. I have written in the past about a particular electronic circuits professor I had that liked to play practical jokes during lessons and exams. Including gag options on a multiple choice test is a great way to inject a bit of tension-easing levity while at the same time eliminating one or more opportunities to guess at a wrong answer (although no relief for the truly clueless). I sometimes do that on the RF Cafe Quizzes that I generate. Radio Craft printed a large bunch of such quiz questions under the title "Radio WittiQuiz...

Microwave Engineering Crossword for 9/14/2014

Microwave Engineering Crossword Puzzle for September 14, 2014 - RF CafeTake a break from the drudgery by trying your hand at some of these goodies. Every word in the RF Cafe crossword puzzles is specifically related to engineering, mathematics, and science. There are no generic backfill words like many other puzzles give you, so you'll never see a clue asking for the name of a movie star or a mountain on the Russia-China border.

Inc. 500 (2014) CEOs Describe 1st Year in Business

Inc. 500 (2014) CEOs Describe First Year in Business - RF CafeIt is well known that the vast majority of start-up businesses fail in the first year and a half. Inc. magazine's new survey of their Inc. 500 CEO member list shows that often even highly successful start-ups initially suffered from the same types of problems that failures did - undercapitalization, poor leadership, bad market timing, failed product or service rollout, difficulty finding and retaining skilled employees, poor fiscal discipline, and the list goes on. 45% claim not enough money at the outset was the biggest issue. A bad fit with key employee(s) and business partner(s) was a close second at 32%. There was no "I was just stupid at first" category, but if there was...

Censorship vs. Radio Progress

Censorship vs. Radio Progress, December 1942 Radio Craft - RF CafeHaving spent a lot of my career working for defense electronics companies in classified programs, I am somewhat torn between sympathizing with Hugo Gernsback from his perspective as editor of Radio Craft and what I know is a valid reason for guarding certain technological information for the sake of military advantage. It is often the case that people who have had no exposure to the 'black' side of industry cannot appreciate the need for it. Their argument postulates that suppressing knowledge does more harm than good because an opportunity for more people to gain from breakthroughs...

Congrats to Book Winner Wouter U.!

Understanding Quartz Crystals and Oscillators - RF CafeCongratulations to Wouter U., of The Netherlands, for being one of two winners in the August RF Cafe book drawing. Wouter selected Understanding Quartz Crystals and Oscillators, by Ramon M. Cerda. I pay shipping so it costs the lucky winners nothing. Graciously provided by Artech House

Comics with the Potential to Make You Laugh!

Comics with the Potential to Make You Laugh! - RF CafeThere is a plethora of comics with just about any theme on the Internet: electronics, physics, mathematics, finance, amateur radio, sports, and politics, to name a few. I could provide pages full of replications for your enjoyment, but one of the best ways to sample available comics for personal consumption and/or use in reports, presentations, etc., is to use the Search function on a website like CartoonStock. The above thumbnail image is a great example of an electronically-themed comic. In it, the anatomically correct mother, father, and son socket and plug family have the inscription, "Sparky! Your mother and I are shocked at your current behavior...

Thanks to LadyBug for Continued Support

LadyBug TechnologiesLadyBug LB480A Power Sensor - Small SizeLadyBug Technologies manufactures the PowerSensor™ line of miniaturized USB RF & microwave power sensors. LadyBug manufactures high accuracy average, pulse, and pulse profiling sensors with GUI interfaces covering up to 26.5 GHz and 80 dB dynamic range. These sensors set a, patented industry standard, No Zero/No Cal technology. There is no need to disconnect or wait for internal zeroing and calibration.

Decoding the Heavens: Antikythera Mechanism

Decoding the Heavens: A 2,000-Year-Old Computer - and the Century-long Search to Discover Its SecretsDecoding the Heavens: A 2,000-Year-Old Computer - and the Century-long Search to Discover Its Secrets, by Jo Marchant. Discovered a century ago in an ancient Mediterranean shipwreck, the Antikythera mechanism instantly attracted scientific interest. It had gears, which was and remains unique among artifacts from Greco-Roman civilization. So begins Marchant's mystery about the object, a tale that ends in triumph but not before inveigling individuals who not only puzzled over the device but also became obsessively devoted to figuring it out. Tantalized by the Antikythera mechanism, scholar Derek de Solla Price felt it was the clue with which he could...

The Mystery Set

The Mystery Set, December 1934 Radio Craft - RF CafeIn the 1930s, electricity and electronics were mysteries to most of the population. The concepts were relatively new and few had a firm grasp on the technology. That reality was exploited by Hugo Gernsback during the 1934 Electrical Exposition to challenge attendees to discover how the radio receiver sitting on the top of an empty, clear glass case was being powered. It was a clever ruse that reportedly stumped most people. The secret is revealed here. BTW, my guess is that an even smaller proportion of our current citizens would be able to figure it out, or for that matter...

September 2014 Newsletter from Anatech

Anatech Electronics Newsletter for September 2014 - RF CafeAnatech Electronics, a manufacturer of RF and microwave filters, has published its September 2014 newsletter. As always, it includes both company news and some tidbits about relevant industry events, regulations, and standards. This month, Sam Benzacar offers his views on the subject of "Interference to Defense Systems: Tough Challenges Require Unique Solutions." There are also a couple headlines on an iPhone-based radar app, military small cell spending, and stealth wind turbines.

Handy-Dandy Engineering Career Advice Articles

Handy-Dandy Engineering Career Advice Articles - RF CafeI like the title of the first article listed in this week's group of career advancement resources. While it is true that some interviewers' questions appear dumb to you, it might just be that he/she has a good reason for phrasing in a particular way to see how you handle vague concepts. Or, it really might be the interviewer is lame, and that is a warning to what it would be like working for/with him/her ;-)

Smart Answers to Stupid Interview Questions
The 10 Excuses of Highly Unproductive People
What to Do If Your Boss Is a Micromanager
4 Salary Negotiation Secrets for Women
Your Newest Employees Are Your Most Vulnerable
7 Things Successful Young Careerists Do Every

Werbel Microwave Intros 4-8 GHz Power Divider

Werbel Microwave Intros 2.2-2.3 GHz 180-Degree Hybrid Coupler - RF CafeNew 2-way splitter covers 4-8 GHz. The 2PA600 power divider manufactured by Werbel Microwave covers 4-8 GHz in a compact case with SMA connectors. Typical VSWR is 1.2:1 and typical isolation is -20 dB. Phase and amplitude balances are maintained at 2 degrees and 0.2 dB, respectively.

Many Thanks to Triad RF Systems for Support

Triad RF SystemsYour source for RF front ends, transceivers and amplifier systems that just plain work! Solutions for integrating high performance HPAs into sophisticated RF subsystems and systems without sacrificing efficiency and linearity. Tower-mounted amplifiers, UAV (aka drone) systems, and many standard (30 - 6,500 MHz, up to 200 W) and custom-designed amplifier subsystems to your specifications. We are a small, private company run by serial entrepreneurs.

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RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
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