Hints and Kinks
for the Experimenter
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 Some are outdated but many are timeless in their application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.
Sony Patents a Wireless
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...
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.
years have passed since I sat in a college classroom to learn about
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...
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...
a fool, many years ago I donated a perfectly fine
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...
Model No. PIFA-9D4G-1D8G-1 is an
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
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.
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...
Skyworks Intros Miniature
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 Cafe Featured Book
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.
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...
Many Thanks to KR Electronics
for Continued Support!
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.
Federal Government Profiting
Handsomely from Student
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...
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."
Unreasonable Effectiveness of Mathematics in the Natural Sciences" - title of article by theoretical physicist
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 & Sons.
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.
for Dummies, 6th Edition - Free Sample Chapter
Letters for Dummies, 3rd Edition - Free Sample Chapter
Interviews for Dummies, 4th Edition - Free Sample Chapter
Tips and Techniques For More Effective Presentations
CS6 Unlocked: 101 Tips, Tricks, & Techniques - Free 61 Page Preview
Career Book Bundle - A Free 207 Page Sampler
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). Enjoy!
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 standardized
audio 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...
husband 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.
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
More Good Tech Articles
your professional edification and reading enjoyment, I suggest the following from MW&RF, EDN, and MPD Digest:
Check for Co-Existence
Between LTE and Radar,
by Greg Jue
So You Think You
Lines, by Eric Bogatin
in Spectrum Analysis,
by Bob Nelson
Evaluate EDA Software
a Wireless World,
by Stephen Maas
Analyzing the Role of
Oscillator Phase Noise
by Dale Henkes
& Science Doodles
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...
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!
Many Thanks to IPP
for Continued Support!
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.
1944 Chart of
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...
time I have some items from the IEEE JobSite newsletter for you, in case you are not a subscriber.
Can't Find the
Work-Life Law Coming to
City Near You
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
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...
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."
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
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...
are a few worthwhile new news stories from the IEEE USA's today's engineer newsletter.
The Key to Unexpected
(and valuable) Discoveries
Egos in Action: My Idea is
Way Better Than Yours!
- Why Do Managers Believe
a Skills Gap Exists?
Science in Trouble?
Free Webinar: Career
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 perspective...
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/ Microwave
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 solutions...
Electronics Analogy Quiz
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.
"The River Sniffer," our intrepid sleuthing heroes
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.
Notable Tech Quote
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!)
Look on eBay for Memorabilia
from Your Military Unit
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...
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.
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...
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...