"Kink" is not a word you hear very often anymore in reference
to having a problem in a process or task, but it turns up fairly regularly in hobby and do-it-yourself types of magazines
as "Hints and Kinks" columns.
Having a kink in the neck or a kink in the garden hose are more familiar uses of the word. "Kink" appears in QST, my older
model airplane magazines, in some of the Popular Electronics magazines, and likely in many others. "Hints and Kinks" type
columns typically are collections of ideas submitted by readers explaining how they solved a particular problem or how they
came up with a new way of doing something. Some are outdated but many are timeless in their application and usefulness.
I put all the ones here in to the latter category.
"Wearable computing device,
comprising a wig that is adapted to cover at least a part of a head of a user, at least one sensor for providing input data,
a processing unit that is coupled to the at least one sensor for processing said input data, and a communication interface
that is coupled to the processing unit for communicating with a second computing device. The[sic]
at least one sensor, the processing unit and the communication interface are arranged in the wig and at least partly covered
by the wig in order to be visually hidden during use." That is the description of patent application #20130311132 submitted
to the USPTO by Sony Corporation on November 21st of this year. Features include, but are not limited to, wireless communications
from an onboard microprocessor to...
You have to be careful when working this
puzzle from the August 1960 edition of Popular Electronics because in one instance the name of a certain federal
agency has changed since then, and in another instance the element cited as being "commonly used" no longer is. It will
add to the challenge, which, honestly, is not all that great. I did not have the magazine page with the solution available
when posting this so I had to work the puzzle myself to create a solution.
Many years have passed since I sat in a college classroom
to learn about transistor fundamentals. The industry had long moved past germanium transistors and was solidly into silicon.
Having been formally introduced to transistors in the USAF, I was familiar with their functionality from a technician's
perspective of checking for gain, proper bias (as indicated on "educated" schematics), and
determining go-no-go health by performing a front-to-back resistance measurement using an ohmmeter. Holes, energy bands,
gate widths, and doping levels were first encountered in solid state physics class, however. This article does a nice job
of introducing the terms and concepts at a layman's level. I actually found the vacuum tube circuits in our radar unit easier
to troubleshoot than transistor circuits, partially because I had a little experience with them prior to enlistment and
also because the point-to-point component mounting made it easy to isolate or remove components...
AWR Corporation, the innovation
leader in high-frequency EDA software, announces the release of v11 Analyst-MP™ -
multiphysics finite element method
(FEM) electromagnetic (EM) analysis software. Analyst-MP is
an application-specific product offering from AWR that leverages the capabilities within its Analyst™ 3D FEM EM simulation
and analysis software while targeting big, multiphysics applications like particle accelerators. Analyst-MP’s diverse and
unique solver technologies are the result of more than a decade of development in collaboration with the U.S. DOD
Like a fool, many years ago I donated a perfectly
tube tester that had been given to me by an über-engineer/ham I worked with during the time (nearly
30 years ago) I was restorating my first vintage tube radio. Bad move. It was a really nice tester: a B&K Model
650 Dyna-Quik Dynamic Mutual Conductance Tube & Transistor Tester. It was sold shortly after I had also given away as
a wedding gift the Crosley floor console radio that I restored. Another bad move. Now, many moons later, I am working to
restore yet another Crosley tube radio and I sure wish I had held on to it. Similar tube testers are routinely selling on
eBay for $100-$200. At some point I'll buy another tube tester, maybe...
PMI Model No. PIFA-9D4G-1D8G-1
is an integrated frequency
down converter used within Doppler Radar Systems. The RF Input is 9.4 GHz ±30 MHz with an input dynamic
range of 100 to 0dBm. The LO Input is 2.803 GHz ±15 MHz with a power level of +5 to +7 dBm. The resulting
IF Output Frequency is 1.8 GHz ±10 MHz. The RF to IF gain is 10 dB to 13 dB. This module incorporates
internal RF, IF and LO filtering and amplification for optimum out of band rejection. Group delay ripple from RF to IF Output
is less than 0.1 ns over a 20 MHz bandwidth.
Vector Telecom has fully instrumented
microwave, millimeterwave, antenna laboratories and production facilities. A wide selection of
waveguide straight and curved plumbing sections, couplers, dividers,
attenuators, circulators, terminations, and rotary joints are available. Their professional engineers have backgrounds from
telecommunications, electronics, space and aviation industries. Frequencies up to 50 GHz, at globally competitive prices.
Custom designs available.
Unless you use handheld calculators on a regular basis, you might be inclined to wonder why someone wouldn't simply use
a computer, tablet, smartphone, etc., for routine calculations. After all, the software available for and the computational
power of even a nothing-special computer greatly outperforms the most powerful handheld calculator, right? The simple answer
is that when you are working in a confined space as is often the case at a classroom desk or in a research and development
lab, finding a place to sit down and use a notebook or tablet computer can be challenging. There is also an advantage in
having a device specially built with a custom ASIC and populated with optimized software that covers a wide range of computational...
Solutions, Inc. introduces a µSwitcher™
step-down converter for space-constrained, portable applications including Bluetooth® headsets, smartphones, digital
cameras, hard-disk drives, portable media players and other battery-operated handheld computers/peripherals. The SKY87250
is a highly efficient, low-supply regulator with integrated inductor housed in a compact package. Given its ultra-small
footprint, integrated inductor and capacitance, the converter is easy to design in and requires very little support.
RF Circuits and Nonlinear Vector Network Analyzers: Interactive Measurement and Design Techniques, by Patrick Roblin.
"With increasingly low-cost and power-efficient RF electronics demanded by today's wireless communication systems, it is
essential to keep up to speed with new developments. This book presents key advances in the field that you need to know
about and emerging patterns in large-signal measurement techniques, modeling and nonlinear circuit design theory supported
by practical examples. Topics covered include large-signal measurement techniques that have become available with the introduction
of NVNAs, direct extraction of device models from large-signal RF dynamic load lines, X-parameters and more.
We have long known that activity on our sun affects
electromagnetic communications. Energetic particles, primarily electrons, explode from the sun's surface
(coronal mass ejections and flares) and are hurled at blazing speeds towards the earth at
an average speed of around
424 km/s (263 mi/s). They begin affecting our upper atmosphere about four days later
by ionizing atoms, thereby altering electrical conduction properties. This in turn determines how and whether electromagnetic
signals either pass through the atmosphere into space or get refracted (bent) back down toward
Earth. Long distance communications in particular are effected, but often even local communications are impacted as well.
Some events have little effect, some cause minor...
For over 40 years KR Electronics has designed and
manufactured high quality RF and microwave filters for the commercial
and military markets. KR Electronics manufactures all filter types and individually synthesizes filters for special
applications. State of the art computer synthesis, analysis and test methods are used to meet the most challenging specifications
for all standard filter types as well as linear phase, constant group delay, video, sin(x)/x, root & full cosine, pulse &
step response, and nearly any custom requirement.
The Federal Government profited $41.3 billion on
student loans in fiscal year 2013, down $3.6 billion from 2012. That's good news, right, the government making a profit
on something for a change? Yes, except for one major fact: The student loan business was completely stolen by the Fed from private lending institutions in 2010. Wouldn't
it be nice if you could simply seize control over an already profitable industry and claim it as your own? Venezuela has
been doing that a lot lately. If you or your child is a student who needs money for school, you now have one place to go;
that evil free market greed by companies harboring an evil profit motive have been removed from the equation.
Oh, wait... What is not factored into those numbers...
Is this a cool photo or what? Shown are three student-built
Cubesats being deployed from the end of the International Space Station's (ISS) robotic arm.
The shape of the launch mechanism reminds me of a 3-pin, single row Molex or Amp (like used on you
PC's hard drive) power connector. "The CubeSat
Project is an international collaboration of over 40 universities, high schools, and private firms developing picosatellites
containing scientific, private, and government payloads. A CubeSat is a 10 cm cube with a mass of up to 1.33 kg. Developers
benefit from the sharing of information within the community. Resources are available by communicating directly with other
developers and attending CubeSat workshops."
"The Unreasonable Effectiveness of Mathematics
in the Natural Sciences" - title of article by theoretical physicist and mathematician
Eugene Wigner. It is part of the title of his book (out of print),
The Unreasonable Effectiveness of Mathematics in the Natural Sciences, in Communications in Pure and Applied Mathematics,
vol. 13, No. I (February 1960), John Wiley &
Some of these offerings are sample chapters from books while others are stand-alone resources from
TradePub. I make a few pennies
(literally) off each item you download. The price you pay is giving them your e-mail, but
to date I have never had a complaint. Thanks.
Resumes for Dummies, 6th Edition - Free Sample
Cover Letters for Dummies, 3rd Edition
- Free Sample Chapter
Job Interviews for Dummies, 4th Edition
- Free Sample Chapter
10 Tips and Techniques For
More Effective Presentations
Photoshop CS6 Unlocked: 101 Tips, Tricks, &
Techniques - Free 61 Page Preview
Wiley's Career Book Bundle - A Free 207
For the sake of avid cruciverbalists, each week I create
a new crossword puzzle that
has a theme related to engineering, mathematics, chemistry, physics, and other technical words. You will never be asked
the name of a movie star unless he/she was involved in a technical endeavor (e.g., Hedy Lamar).
If you are an audiophile, you probably have spent a lot
of effort setting up your home entertainment system, car system, and maybe even your portable music player. You know all
about how to select speakers, where to place them, the kind of wire and connectors to use, treble, midtone, and bass
equalization. You know what you like, but the way you perceive sounds is not the way many other people do. Even if your
hearing follows a 'normal' response curve per
tests, personal preferences vary widely in part because the way brains are wired (speed of sound
processing, preferred musical style, state of mind - maybe you're insane) and in part because of the impact of sound
waves upon your body (soft tissue and bone pressure wave conduction, clothing worn). Pitch,
timbre, tone, and loudness has been extensively studied and quantified. While three of the four are purely objective measurements...
wants a selenimum rectalfire, a silicode capasitator, and a 16 bome appleflyer." That is the caption of one of the "Hobnobbing
with Harbaugh," comics that appeared in the June 1962 edition of Popular Electronics magazine. "Hobnobbing
with Harbaugh" was a monthly feature for a couple years that dealt with stereotypical (pun intended) behavior of technophiles
and their often unwilling, often unwitting wives, girlfriends, kids, parents, workmates, and neighbors.
Wenteq has helped deliver RF Cafe since
2009. "We provide a wide range of high quality RF and microwave
products with quick delivery time at very competitive low prices. Our products include coaxial connectors and adapters,
circulators, isolators, low noise amplifiers, power amplifiers, broadband amplifiers, terminations and more, covering the
frequency range of 100 MHz to 110 GHz. We also provide technical consulting services and engineering contracts
which include antenna design, electromagnetic structural analysis, and low cost manufacturing of RF/microwave circuits and
For your professional edification
and reading enjoyment, I suggest the following from MW&RF, EDN, and MPD Digest:
- Check for Co-Existence
LTE and Radar,
by Greg Jue
So You Think You
Lines, by Eric Bogatin
in Spectrum Analysis,
by Bob Nelson
Evaluate EDA Software for
a Wireless World,
by Stephen Maas
the Role of Local
Oscillator Phase Noise in
by Dale Henkes
Do you remember seeing a cool Doodle on the Google search page and would
like to find it again? Would you like to see not only the Doodle that piqued your interest, but ALL of the Doodles that
Google has ever published? You can do that, but what might be more useful would a page full of all the technology- and science-related
Doodles or some other specific topic. Fortunately, there is an easy way to find what you want by going to the Google website
and typing "google doodles" into the search box. Once
you get there, enter the specific event that interests you. Doodles have been created to commemorate, among other topics,
Robert Noyce's Birthday, the Large Hadron Collider, and the Invention of the First Laser. Some, like the 25th Anniversary
of the Buckyball, are animated. If you happen to be interested in seeing the Google Doodle for Canada Day
, Bruce Lee's 125th Birthday
, or Thanksgiving Day
- all worthy Doodles - then add the name of your sought-after...
Excel-Wireless is a solution
provider with many years of experience in the cellular amplification
and wireless communications industry, serving private companies, universities, military and government agencies. Cellphone
signal boosters, antennas, cable assemblies, and WiFi/WLAN network equipment are among our offerings. We stand behind our
products offering full service warranty, return and replacement, and installation support. We can produce up to 10,000
pieces of different cable assemblies every day. Not many factories can do that!
Innovative Power Products has been with RF Cafe
since early 2008. Innovative Power Products has more than 25 years of experience designing and manufacturing RF Passive
Components. Our RF couplers, combiners, resistors, and terminations
incorporate the latest technology in materials available, which equates to unrivaled product performance. Please call 1-631-563-0088
to speak to an experienced Design Engineer about your upcoming project.
You cannot buy this amazing
Chart of Electromagnetic Radiations anymore, but thanks
to the folks at Lawrence Livermore National Laboratory, extremely high resolution image files of it have been placed on
the flickr website. The chart showed up in Popular Science magazine recently. W.M. Welch Manufacturing Company originally
sold the wall poster in 1944, so the content does not reflect knowledge gained in the last seven decades, but its sheer
artistic beauty and amazing content is enough to bring a tear to a technophile's normally staid eye. Even if you do not
print out and hang it on your office wall, you owe it to yourself to at look at the 10000x6958-pixel version...
This time I have some items from the IEEE JobSite newsletter for
you, in case you are not a subscriber.
- The No.
Employers Can't Find the
- Work-Life Law Coming to
How to Make Your Resume
or CV Age Anonymous
- Asia-Pacific – Open for
Business, and Tech Jobs
War for Talent Continues
for Engineers in Europe
I have to admit that when I
saw this large advertisement for the
Tarzian company in Radio & TV News, I didn't recall ever having heard of the company. According to Wikipedia,
"Sarkes Tarzian (1900-1987) was an American engineer, inventor, and broadcaster... He attended
the University of Pennsylvania and received an undergraduate degree in 1924 and a graduate degree in 1927. Tarzian worked
for the Atwater Kent company and then for RCA... He founded the manufacturing company Sarkes Tarzian Enterprises in 1944,
and was involved in early experiments in VHF audio broadcasting in 1946... In 1949 he started television station WTTV...
Agile Microwave Technology is the newest company
to join supporters of the RF Cafe website. Without their backing, RF Cafe would not exist. Please show your appreciation
by taking a moment to visit Agile Microwave Technology's website to see whether they might be of use to your project for
RF amplifiers, switches, limiters, multipliers and mixers up to 40 GHz.
"Our founders have over 100 man-years of experience designing, developing, manufacturing, marketing and providing innovative
solutions to the industry. Higher Performance at Lower Cost through Innovative Engineering."
Apologies to Ford and Chrysler aficionados for not
having similar articles for your classic automobiles, but this article from a 1957 edition of Radio & TV News
only covers Chevrolet radios. Maybe someday I will acquire editions with other models. Transistors were fairly recent
newcomers on the portable radio scene (on any radio scene for that matter), so you will please
excuse the absence of them in most radios of the era. In fact, as evidenced by a companion article in this same edition
titled "Delco's All-Transistor Auto Radio," such newfangled devices like transistors were reserved for top-of-the-line models
like Cadillac's Eldorado Brougham. A move toward printed circuit boards, rather than the time-honored point-to-point wiring,
was well underway, and push-button tuning was being sold to the car buying public as an indispensible safety feature - the
"hands-free" feature of yesteryear. Even though push button tuning with memory (albeit mechanical)
for storing station locations had been around for a long time in tabletop and floor model console home radios...
Here are a
few worthwhile new news stories from the IEEE USA's today's engineer newsletter.
The Key to Unexpected
- Egos in Action: My Idea is
Way Better Than Yours!
Why Do Managers Believe
a Skills Gap Exists?
Science in Trouble?
Free Webinar: Career
AWR Corporation offers the second in a series of white
papers addressing RF/Microwave design flow issues. This latest offering, "EDA Software Design Flow Considerations for the
RF/Microwave Module Designer," outlines the steps for implementing an integrated design flow within the Microwave Office®
design suite for an MCM microwave monolithic integrated circuit (MMIC) design. This white paper is a follow on to "RF/Microwave
EDA Software Design Flow Considerations for PA MMIC Design," which examines GaAs pHEMT PA design approach from a systems
Civil Air Patrol
(CAP), being made primarily of volunteer, unpaid airmen and officers, has been serving the
country since World War II. Many members use (or at one time used) their own aircraft
and radio gear in the service of the country. Per the CAP website, "In the late 1930s, more than 150,000 volunteers with
a love for aviation argued for an organization to put their planes and flying skills to use in defense of their country.
As a result, the Civil Air Patrol was born one week prior to the Japanese attack on Pearl Harbor. Thousands of volunteer
members answered America's call to national service and sacrifice by accepting and performing critical wartime missions.
Assigned to the War Department under the jurisdiction of the Army Air Corps, the contributions of Civil Air Patrol, including
logging more than...
Fundamentals of RF and Microwave Transistor Amplifiers, by Inder Bahl. "This book
provides state-of-the-art coverage of RF and microwave transistor amplifiers, including low-noise, narrowband, broadband,
linear, high-power, high-efficiency, and high-voltage. Topics covered include modeling, analysis, design, packaging, and
thermal and fabrication considerations. Through a unique integration of theory and practice, readers will learn to solve
amplifier-related design problems ranging from matching networks to biasing and stability. More than 240 problems are included
to help readers test their basic amplifier and circuit design skills-and more than half of the problems feature fully worked-out
electronics analogy quiz is a little easier than a few of the others published in Popular Electronics
because all of the electrical and mechanical objects depicted here are very familiar. The concepts might seem trivial to
those of us who have been immersed in the science for decades, but I for one can remember when first hearing these analogies
how helpful they were. Not only that, but I also recall during physics and mechanics courses in college being amazed at
the similarity of equations shared by electrical and mechanical processes.
In "The River Sniffer," our intrepid sleuthing
heroes Carl and Jerry apply their electronics prowess and lessons remembered from chemistry class in order to
catch polluters who are dumping chemicals into the river where they like to fish. I always like being reminded of something
long forgotten when reading an article, and this one did not disappoint. Do you recall what 'pH' stands for as a measure
acidity or alkalinity? It means 'potential Hydrogen ion concentration.' Don't thank me
if it jogged your memory as well - thank Carl and Jerry.
"I am, and ever will
be, a white-socks, pocket-protector, nerdy engineer -- born under the second law of thermodynamics, steeped in the steam
tables, in love with free-body diagrams, transformed by Laplace, and propelled by compressible flow." -
Neil Armstrong (I had
forgotten about free-body diagrams in Statics class!)
If you are getting nostalgic in your old age and want to
reclaim some of your past military duty history, one possible venue is eBay. A fellow USAF radar shop technician recently
wrote to ask if I would be willing to part with one of my 5th Combat Communications Group (aka 5th Mob) patches as displayed on my
web page dedicated to the radar shop at Robins AFB, Georgia. Since I only have one of each patch, I decided to look on eBay
to see what might be available, although admittedly with little expectation that any of the patches would be show up. To
my surprise, not only were patches available, but other kinds of paraphernalia like basketball team jerseys
(I didn't know the 5th Mob had one), coffee cups, pens, hats, and other stuff. I had
no idea that there was an Association of Old Crows (AOC) patch for Robins Air Force Base.
If I can...
Take a break and work this week's
microwave engineering themed
crossword puzzle. All the words are pulled from a hand-built list of terms, names, and abbreviations that have only
to do with science, mathematics, and engineering. If you want a crossword with names of movie stars and obscure countries,
try the local newspaper. If you want to exercise your nerd knowledge, this is the one for you.
Almost without exception when there is a breaking news story about some schmo being arrested
for committing a crime, reporters find neighbors who say they were taken totally by surprise because the accused is such
a nice guy and keeps to himself, volunteers at the food pantry, etc. There was never any sign that the guy
(or gal) might be on the verge of robbing a bank, embezzling church funds, or kidnapping a
couple neighborhood children. It has happened often enough that I have adopted the philosophy that you can never really
know someone unless you live with him/her for a long time and are aware of all activities. Such a surprise happened to Melanie
and me a few days ago. The dentist we have...
RF Cafe visitor and occasional contributor Gary S.
just sent me photos of two fine looking vintage U.S. Navy radios that he restored to working order. The condition of the
front panels on both radios is amazingly good. Here is Gary's Tale of Two Radios. "I thought I would share with
you my latest refurbished WW-II Navy receivers I acquired last spring. I say refurbished because I do what repairs are needed
to get them operational again and then clean them up a bit. I consider a restoration to mean made to work and look
like new again using original parts if they are available. The first receiver is the
RBG-2 general coverage HF communications receiver. It covers from 540 kc to 32 mc. They didn't use Hertz in those
days. It is basically an HQ-120X beefed up to Navy specs...