For some inexplicable reason I went backwards on
this three-part "Tube Family Tree" series that appeared in Popular Electronics. Author Louis Garner, Jr., starts
out with the early history of vacuum tubes, beginning with Thomas Edison's incandescent light bulb and then quickly progresses
to Lee de Forest's Audion amplifier tube, and on through the evolution of multi-grid vacuum tubes that are specially designed
for low noise receiver front ends, high power transmitters, voltage and current regulators, video cameras, pulse forming
networks, traveling wave tubes, and many other types. There is quite a bit of information and history contained in these
three installments that will do a very nice job of introducing you...
Solutions, an innovator of high performance analog semiconductors enabling a broad range of end markets, today announced
the creation of a joint venture with Panasonic Corporation, one of the largest electronic product manufacturers in the world,
to design, develop and deliver high performance filters including surface acoustic wave (SAW) and temperature compensated
(TC) SAW devices. At the core of the joint venture is Panasonic Filter Division's engineering and process talent , expertise
in filter design and leading edge products as well as 412 fundamental filter patents...
Newsreel archive British Pathé
(named in deference of French moviemaker Charles Pathé) has uploaded its entire collection
of 85,000 historic films, in high resolution, to its YouTube channel. Subjects span a pretty wide range, but fortunately
there is a search function so you can narrow the field down easily to topics like "electronics," "radar," "telephone," "transmitter,"
"atomic," etc. If you also like historical accounts of automobiles, motorcycles, airplanes, medicine, trains, boats, chemistry,
or just about any other subject, British Pathé probably
has something related to that as well. Most videos are only a few minutes long, so they do not take much time to view. It
seems that some of the videos on the pages of their website have been edited for brevity, but the YouTube versions...
AWR Corporation, the innovation leader in high-frequency EDA software,
NI AWR Design Environment™ V11, its first major software release in 2014, which includes new features,
enhancements, and user interface changes to Microwave Office®/Analog Office® circuit design software, Visual System Simulator™
(VSS) system design software, AXIEM® 3D planar electromagnetic (EM) software, and Analyst™ 3D finite element method (FEM)
you know what a
soroban is? I have to admit ignorance prior to reading this 1963 "Carl and Jerry" adventure in Popular
Electronics. As with many of these stories, real equipment, people, and companies were referenced; this time it was
the Pastoriza Personal Analog Computer, a modular electronics system for calculating differential equations. The cost was
around $300 (~$2,300 in c2014 money). Analog Devices bought the company from James Pastoriza
in 1969. What does the Pastoriza computer have to do with the story, you might ask? Nothing, really; it was mentioned in
a discussion Carl and Jerry had when accepting a calculating speed challenge from obnoxious dormitory mate...
Microwave Circulator Design, 2nd Edition, by Douglas K. Linkhart. Circulator design has advanced
significantly since the first edition of this book was published 25 years ago. The objective of this second edition is to
present theory, information, and design procedures that will enable microwave engineers and technicians to design and build
circulators successfully. This resource contains a discussion of the various units used in the circulator design computations,
as well as covers the theory of operation. This book presents numerous applications, giving microwave engineers new ideas
about how to solve problems using circulators. See
RF Cafe Quiz #59.
Marvels will soon shed some light on the business sector consisting of passive electronic components built for microwave &
RF applications, and on Res-net Microwave,
one of the very successful
microwave component manufacturers in that sector. The 2-minute profile will air on the Fox Business Network on May 8th between
9:3-9:45pm ET. Manufacturing Marvels narrator John Criswell will describe and show some of Res-net's special manufacturing
to winner Steve Gilbert, of Brecksville,
Ohio! Steve's name was drawn form a pool of about 100 entrants. The results of the questionnaire will be summarized and
Said Steve upon learning he had won, "All
right, this is the first thing I've won since 1980 when I won five free lunches at Arby's on a radio contest for being the
first to person to phone in and identify the mystery song... which happened to be 'Dead Skunk in the Middle of the Road'
by Louden Wainwright III. One of my favorite hobbies is finding mistakes in
"I think high self-esteem is overrated. A little low self-esteem
is actually quite good…Maybe you're not the best, so you should work a little harder." Also... "Stephen Hawking is getting
a divorce. That's scary. If the smartest guy in the world can't figure out women, we're screwed." - Jay Leno
LinkedIn sent an email with
a few of these career news stories, so I took the opportunity to search for a few more that should be useful. Enjoy.
Jobs, So Why Are
Engineering Jobs at
Walmart... Who'd Have
Managers Beware: What
Toxic "Jane" or "Joe" Can
Do to Your Team
Why Social Networks Are
‡ IEEE-USA Rolls
New Hope for Enhancing
U.K. Skills: Apprenticeships
"This must be the early prototype
for Google Glass," was the first thing that came to mind when I saw this story in a 1962 edition of Popular
Electronics? It is intended to allow 'future' astronauts to have improved situational awareness by providing means
to look behind himself without needing to turn around, and to receive mission data via a miniature CRT embedded within the
viewer. Voice communications is featured as well. Hughes Aircraft Company (nowadays just 'Hughes')
might just want to consider assigning a handful of its highly paid attorneys to look into a patent infringement action based
on the original content of its "Electrocular" headset...
an international Radio Frequency (RF) and Microwave solutions provider, announced today that the company has been awarded
a contract from a U.S. Department of Defense (DoD) contractor to
rapidly develop a
custom RF upconverter module for use in a government satellite application. The custom RF upconverter will not only
translate an IF signal to an RF signal, but it will also provide power amplification in support of the government's mission...
Dr. Cynthia Furse (note Smith Chart
earrings in her photo), a Professor of Electromagnetics at the University of Utah's Department of Electrical Engineering,
has produced a
very nice video series that covers a wide
range of topics and techniques on the venerable
Smith Chart. The
ten videos begin with an introduction, progress through reflection coefficients, shorts and opens, impedance matching, a
slot line example, and finally a summary. Dr. Furse rose to worldwide fame about a decade ago a least partially based
on the colorful handmade quit she created with a Smith Chart pattern; it is an exquisite example of juxtapositioning...
crossword puzzle has an amateur radio
theme. Every word and clue is not specific to ham radio, but every word and clue is related to engineering, science,
technology, math, chemistry, etc. If you want to exploit your knowledge of movie stars and fashion designers, try the NTY
Here are a few tidbits of breaking
communications news from 1940. "Mayday" had evidently recently been adopted as the preferred distress call rather than
"SOS" or even "Help!" For some unknown reason a radio owner desperate to get his set working again dragged a potato across
the top of a vacuum tube and it suddenly started receiving the local station. An employee of Edison Company of NYC devised
a "storm detector" for warning of potential lightning strikes in the area (possibly akin to Franklin's
Bells?). In other news, 'long life' vacuum tubes were announced that would last up to 4½ years, and some police departments
were finally receiving portable radios. It was an exciting time!
You don't have to have a PhD in electrical engineering to make nutty drawings,
but it helps if you do it using conductive ink and a 12 kV neon sign transformer. The ink came from the Bare Conductive™
company's Electric Paint product line that is supplied
in a jar for brush application or in a pen format. Evidently conductive paint is a big deal because it was just back in
February of this year (see "The Art of Technology")
that I mentioned another Kickstarter project called Circuit Scribe that produced a similar product. Bare Conductive is in
production with not just the aforementioned conductive ink media, but also peripheral products for use in experimentation,
including the custom interface circuit board shown below. I doubt the Electric Paint is meant to be incorporated into commercial
Getting Brains into Gear with the
FEKO Student Competition. The popular FEKO
Student Competition is once again open to all under-graduates and post-graduates who work on a supervised project in electromagnetic
engineering and make use of FEKO. This annual competition is an opportunity for students to showcase their work. There are
some attractive prizes up for grabs – a state-of-the-art laptop computer or attendance to an industry related conference
anywhere in the world...
Some people like to complain about the rising world population
and the stress it places on the environment and economy. The upside of more humanity is that there is an unprecedented amount
of research and product design being performed by some really smart people - many of whom would have gone undiscovered in
remote regions of the Earth if not for outreach programs. The current plethora of great new books and
magazine articles is evidence of it, like the ones
I have hyperlinked below...
α - QAM Is Rising: 1024QAM
Dr. H. Mohammed
in Return Planes
Yes or No?, K. Wyatt
Part Average Testing Finds
and Rejects Outlier ICs,
New Ampere Won't Affect
M. Rowe <more>
AWR Corporation, the
innovation leader in high-frequency EDA software, will sponsor the upcoming Microwave Journal Magazine technical education
Practical Antenna Design for Advanced Wireless Products. The webinar will be presented by Henry Lau, CEO
of Lexiwave Technology, a solution provider specializing in RF system and RFIC design for communication and consumer products.
Antenna performance plays a critical role in determining the communication range and quality of service for wireless devices.
This webinar offers participants technical insights...
An article on the Forbes website titled
"22 LinkedIn Secrets LinkedIn Won't Tell
You" recommended in secret #19:
"Be personal. Your profile is not a resume or CV. Write as if you are having a conversation with someone. Inject
your personality. Let people know your values and passions. In your summary, discuss what you do outside of work. You want
people to want to know you."
Not wishing to offend author William Arruda by completely ignoring his advice, I set about writing in effect a short
bio explaining (apologizing for?) my existence and how I got from 'there' to 'here.' That
I got a bit carried away was made abundantly clear by LinkedIn's software informing me that I had just pasted in 2,236 more
characters than they thought would be enough for any reasonable person. It's always the 'reasonable person' thing that bites
me in the posterior...
Ooooh, I should have posted this story about 23 days ago, but better
late than never. I meant to, but forgot. The story documents development of the "transistom" device
back in the 1958 timeframe. Keep in mind that it was just a decade earlier that Mssrs. Bardeen, Brattain, and Shockley introduced
the transistor amplifier to the world. The transistom was basically a 3-terminal transistor with two additional leads for
a revolutionary power source built from radioisotopes of magnesium and manganese. In the day, school kids, including me,
were handed blobs of liquid mercury to inspect and pass around in class, demonstrating how relatively ignorant we were about
things we now consider to be extreme health hazards. Accordingly, encapsulating radioactive material in consumer devices...
Survivalists have been encouraging people to buy vehicles
that were manufactured prior to the time when electronic ignition systems and/or computer controls were added so that when
"The Big One" hits, the EMP from a nuclear blast will not shut down their
vehicles. In doing so, if you live through the event, you will at least still have serviceable transportation. Getting gasoline
from a pumping station will be impossible since those computers will be dead, but there will be a lot of disabled vehicles
sitting around with tanks full of gas for sale. Capitalizing on the vulnerability of modern cars and trucks - and even boats,
motorcycles, and snowmobiles for that matter - to being stopped cold by a powerful electromagnetic field, military and law
enforcement agencies are developing systems that simulate the results of a nuclear EMP event...
You are taught early in your electronics career
to be mindful of the tendency for measurement equipment to affect the circuit it is measuring, and therefore the indicated
results. In the case of high frequency circuits, even minute amounts of capacitance and/or inductance can render results
utterly unusable, but even in circuits operating down to D.C. the simple internal resistance of a meter can profoundly affect
measurement accuracy. High impedance circuits are particularly vulnerable to such
"loading" effects by
test equipment. For example, consider a circuit being measured that has an impedance of 10 kΩ and the internal
resistance of the VOM is 100 kΩ. If the open circuit "true" voltage level is 11 V, then voltage division effected
by the 100 kΩ meter in series...
RF Cafe visitor and Amateur Extra Lynn L. sent me a link to this article titled
"The Day CRUD Radio Died," by
Donald Kimberlin. Mr. Kimberlin tells a real-life tale of an effort to track down and shut down a pirate broadcast station
in southern Florida. The perpetrator, as it turns out, was an overambitious teenager who decided to provide a bit of listening
enjoyment for his friends and anyone else within radio range. The hero of the story is a good-natured FCC marshal who, in
spite of having to fight with his agency's bureaucracy, managed to 'convince' the lad to abandon his post. You will enjoy
this quick read. It is posted on the Broadcaster's Desktop Reference website.
For all the time I invest in researching
and writing about vintage radios of the vacuum tube variety, it is somewhat embarrassing to admit that I still do not have
an operational set, although a Crosley 03CB console model is in the works now. I did, however, buy a
Tesslor model R-601S AM/FM radio
a couple years ago in order to be able to enjoy the warm orange glow of vacuum tubes while other projects were in the works.
The R-601S is a nice mix of the old and the new in that while it uses vacuum tubes for the speaker preamp and output driver
circuits, there is a state-of-the-art solid state receiver front-end and tuner. I did a write-up and video tour of the Tesslor
R-601S radio in 2012. Last Fall (2013), Tesslor added Bluetooth 3.0 wireless connectivity
capability to the R-601S and offered to update my radio...
Here is an item than can
be worth it's weight in gold. At today's gold spot price of $1283/oz., this 12.8-ounce Eclipse 900-056
Field Service ESD Protection Kit would be worth $16,422. OK, maybe that's overstated, but depending
on what type of equipment you happen to be working on, zapping an electronic component because you failed to exercise proper
ESD protection measures could potentially (pun intended) cost that much. Silver closed at
$19.39/oz., so maybe it is a bit more realistic as it makes this ESD work station worth $248. That's about the price of
a replacement smartphone or midrange radio if you zap it while tinkering. Seriously, though, if you work on microelectronics
without adequate ESD protection measures, you're asking for trouble. Even if you don't fry anything right away, you are
likely to create the "walking wounded" scenario where failure is imminent in the future. $34 for this ESD work mat is cheap
Having worked around resistors and capacitors for more than four
decades comes in handy when presented with 'simple' quizzes like this one that appeared in a 1963 Popular Electronics
dealing with RC circuits. Still, there is always some trepidation involved when being subject, even voluntarily, to
a test of any sort, regardless of whether you are fairly confident that it will be a lead pipe cinch, a cake walk, child's
play, so to speak. Even if nobody else will bear witness to your effort, you would feel like a real moron if you missed
even one of those simple questions that anyone with your level of experience should get right without even having to think
about it. Such is the irrational fear I have when taking these quizzes prior to posting them on RF Cafe. I have always been
honest about the results...
a premier manufacturer of RF connectors,
cable assemblies and RF components, including specialty
connectors, Dongjin TI is highly recognized an RF
industry leader in Korea. Our premium products offer a competitive price, on-time
delivery and best quality in the industry. They have no minimum order size and 1-day delivery. Products are ISO9001, ISO14001,
ROHS qualified, as required. VSWR reports are available on request.
Wouldn't it be nice if you could get a
free subscription to your favorite hunting, bicycling,
or cooking magazine merely by demonstrating that you have a vested interest in the subject that advertisers can exploit?
Don't be looking for a year's worth of Field & Stream, Road Bike, or Baking to arrive in
your mailbox anytime soon, but you can, if you are qualified, received complimentary subscriptions to many of the big-time
engineering magazines. Here are just a few of scores available.
Both funny and ridiculous I thought
as I read this article from a 1940 edition of National Radio News where author Julius Aceves, a consulting radio
engineer, makes the case for not buying a newfangled, cheap radio that is supplied with a built-in antenna when using a
outdoor antenna is the better option. It's not that he doesn't have a valid point about the larger, obstruction-free
outdoor antenna providing superior signal strength and a greater signal-to-noise ratio; it's that part of his argument is
that in doing so you are denying the outdoor radio antenna companies revenue. That mindset is akin to telling people they
should not buy notebook computers because...
MECA Electronics would appreciate your taking
a few moments to take a look at their newest magazine advertisement that highlights products they will feature at
IMS2014 in Booth #842.
It's been a couple weeks since
posting links to stories on job searching and career management. I should put an entry on my weekly calendar to do so. The
stock market is way up so the economy - and therefore the job market, must be going smashingly well - right?
• IEEE ResumeLab
Don't Give It All Away at
the Job Interview
to Make the Most
of a Business
3 Steps to Take If You Are
Rejected from Your Dream
Newest Organized Labor
Group: Start-up Employees
"The problems of the world cannot possibly
be solved by skeptics or cynics, whose horizons are limited by the obvious realities. We need men who can dream of things
that never were, and ask why not." - President Kennedy's address to the Irish Parliament in June 1963,
JFK Presidential Library
of Escondido, CA, is a relatively new startup engineering design and development service. Owner
Steve Massey, with his many years
of circuit and system experience, is currently consulting with major RF and microwave companies to provide engineering design
services to develop products for the commercial communications and military marketplace. All levels of service are provided.
He will work with you from conception to schematics to layout to physical products, and everything in-between. RF testing
and PCB prototyping services are available to complement the consultant design services (see extensive list of
in-house equipment and software). Please
call Steve at 760-748-MEGA (6342) to learn more. "Let's go get it done!"
I considered not bothering to create these custom
engineering themed crossword puzzles
anymore, but in checking the website statistics, I discovered that my collection of crosswords that began more than a decade
ago has generated more than 58,000 page views just in the last year alone. Evidently there are people who are interested.
Since I make each one new every week, it is easy for me to create a custom puzzle for your company, school, club, event,
etc. Send me an email if
you have a request.
submitted photos of his completed MPN-13
GCA model with a spiffy real-looking camouflage paint job! It includes both the maintenance trailer and the operations
trailer, complete with ASR antenna, PAR antennas (az/el), VHF and UHF antennas, and navigation
hazard lights. The "M" part of "MPN" stands for "mobile." As such, I and hundreds - maybe thousands - of USAF radar technicians
have over the decades disassembled, transported, and reassembled these radars many times. My radar shop at Robins AFB, GA,
participated in what were code-named "Healthy Strikes" two or three times each year, whereby a claxon in the barracks rudely
awoke 5th Combat Communications Group members at around 5:00 am to signify the beginning of what would be about a week...
Walter Drake, a thermoformed
packaging manufacturer, has recently released the "Purchasers Guide to Thermoformed Packaging". The guide will assist buyers
and specifiers in the correct selection of
thermoformed packaging such as plastic clamshells, thermoformed trays and blister packs. Walter Drake designs and manufactures
custom thermoformed plastic packaging in the form of clamshells, trays and blisters for the medical, pharmaceutical, electronic
(ESD, static dissipative), consumer and industrial packaging applications.
This article by Bob Ambrogi, of
IMS Expert Services, rhetorically asks the
question of whether an 'expert' is required in order to
another 'expert' because of his sworn testimony.
In this particular case an expert was hired to help prove claims of wrongdoing by
a neighboring industrial complex. Being declared qualified as an 'expert' varies from state to state, but it usually requires
extensive documented professional experience, and/or an advanced college degree, and/or professional registration as a result
of special testing. I, for example, would likely not qualify to serve as an expert witness in a trial. Like it or not -
and many people believe it to be a form of acceptable payola...
ECM announced a new authorized distribution agreement with MECA Electronics to supply
the manufacturer's line of USA made rugged & reliable RF/microwave passive DC – 20 GHz microwave components and solutions
globally. MECA serves all areas of the RF/Microwave
industries including world class network providers. They have long been the "backbone" of high performance wired and
air-interfaced networks such as in-building applications, satellite communications, radar, radio communications, telemetry
applications, mobile radio, aviation and air traffic communications...
1962, John T. Frye's techie troubleshooting teenagers
Carl and Jerry had graduated from high school and were attending Parvoo University
(PU?) as electrical engineering students. It was a natural progression. Unlike many of the
company names and products - like the Delco DN278 transistor mentioned here - that appeared in the Popular Science
series, the college's name is fictional. Maybe author Frye had a connection to Porvoo, Finland, and Anglicized the name.
I ran "parvoo" through a couple online anagram solvers to see if it was a disguised name (which would
be apropos for a detective story) and the closest it came to a real word is 'vaporo,' which is an Esperanto term...
When I first saw the title of this poem from a 1941
edition of National Radio News, I thought it was going to be a plea to amateur radio operators not to give up their hobby
just because the government would eventually prohibit broadcasting during the World War II years. As it turns out,
the poem predated that era and is instead a generic encouragement to the magazine's readers to press on regardless of obstacles.
It did show up in the Christmas issue, so maybe it was simply a message in the spirit of peace on Earth and goodwill toward
man. In these harsh years of the government fomenting division and class envy amongst its citizens, it's kind of hard to
relate to such a gentle, kindly mindset, but indeed it did once exist in America. Anyway, I though it was worth reprinting
Quit" is sort of a simpler version of Rudyard Kipling's famous poem of inspiration titled "If."
If you haven't yet heard about the Arduino single board computer (SBC) experimenter's platform, then either
you have been in a coma or you are just now entering the tech world. Think of Arduino as the electronic version of the famous
mechanical Erector Set that was popular beginning in the early 20th century. Or, consider it the "grown-up" version of Lego's
computerized Mindstorms building sets. Per the official website, "Arduino is an open-source electronics prototyping platform
based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists and anyone interested
in creating interactive objects or environments..."
We now have a source for those much-sought-after plastic
SMA finger wrenches! Bracke Mfg manager Lawrence P.
sent me an email today saying that Bracke will be glad to mail anyone who requests them a sample of up to 5 of the SMA finger
wrenches - what a guy! I'm guessing he saw the plea posted here on RF Cafe and on various forums for people looking desperately
for the things. The SMA finger (thumb) wrench, known
also by its Latin binomial nomenclature of 'digitus divellit,'
is a rare breed of tool for the RF / microwave engineer, and appears to be indigenous to industry trade shows like MTT-S
and European Microwave Conference...
to around 1960, the nature of electromagnetic radiation outside the Earth's atmosphere was entirely a matter of scientific
conjecture. As is evidenced by this 1961 article, at the time it was still not known for certain whether
energy outside the bands transmitted through the ionosphere existed for sure. There was of course no reason to believe
that low frequency, long wavelength radio waves were not present along with the rest of the spectrum, but experiments needed
to be developed that would launch satellites above the atmosphere to detect probable out-of-band signals and then re-transmit
them on frequencies known to easily penetrate the 'ether.' Many failures occurred along the way, but persistence paid off...
resonant tank circuits has not changed since they were first investigated more than a century ago. This
"After Class" tutorial that ran in the May 1961 edition of Popular Electronics is typical of the series where the
author speaks as though he was giving an impromptu lesson to a gathering of students after the scheduled classroom period
was over or, in this instance as though he was having a casual discussion with a friend who was perplexed by a particular
electronics phenomenon. Figures and equations are often drawn by hand to augment the informal setting rather than being
typeset. Here, "Larry" is amazed...