thyratron is not necessarily a familiar type of vacuum tube to most RF and microwave electronics practitioners
unless they happen to be involved in radar, imaging (x-ray), particle accelerators, etc. It
is basically a high speed, high current switch used in pulse forming networks for firing magnetrons
(via a high-voltage transformer). Both the S-band airport surveillance radar and the X-band
precision approach radar I worked on in the USAF employed thyratrons. The X-band radar had been modified by the time I came
on the scene to use a solid state thyratron (one of the earliest adaptations), but the S-band
radar still used its original vacuum tube thyratron. While I don't recall for certain, I believe the thyratron in the thumbnail
image is the one it used. The accompanying ruler is 12" long to give you an idea of the size. They used to burn out and
have to be replaced...
(personal anecdote included)
PCB Material World is an independent distributor
and market maker of PCB raw materials. They buy and sell PCB
raw materials such as copper clad laminates, copper foil, drill backer and entry, among other items. They also buy surplus,
obsolete, and offcut RF copper clad laminates. PCB Material World has been with RF Cafe since 2009!
I knew that a polyglot was a person who spoke many languages,
but wasn't sure how it applied to patents. According to Merriam-Webster, the second definition of 'polyglot' is, "a book
containing versions of the same text in several languages." The multilingual person is definition number one. Scientific
American magazine ran an article titled, "The Polyglot Patent
Boom" that discusses how the number of U.S. patents awarded to assignees in multiple countries is - and has been for
a while - on the rise. A look at the thumbnail of the stacked chart included in the article illustrates the phenomenon.
It begins on the left in 1985 and terminates on the right at 2010, and shows U.S. patents awarded with at least one assignee
being a citizen of China. Orange, red, and purple portions...
believe that opportunity looks a lot like hard work." - Ashton Kutcher re never having had a job below him, at the
2013 Teen Choice Awards (see
Mr. Steve Gross has a nifty story from his time in the U.S.
Navy as a shipboard electronics technician in this edition of EDN's "Tales from the Cube." When at sea, access to spare
parts is very limited so you often have to exercise a combination of ingenuity and creativity (not
necessarily mutually inclusive traits) to get the job done. In his case it was the need to find a suitable replacement
for a Darlington pair transistor in a piece of specialized
test equipment. With the help of a visiting engineer, he came up with a working circuit.
reminds me of another of my own tales from earlier days as a technician, but only from the standpoint of constructing a
semiconductor component from pieces of others...
Skyworks Solutions introduces
five highly linear, active bias, low noise variable gain amplifiers for LTE and WCDMA infrastructure systems. The SKY65369-11
(832–862 MHz), SKY65370-11 (814–849 MHz), SKY65371-11
(880–915 MHz), SKY65373-11 (1710–1785 MHz) and SKY65374-11
(1850–1915 MHz) receive modules are fully integrated, high performance devices that combine
several discrete components into a single, easy-to-use solution.
Cypress Industries, located in Austin, TX,
manufactures industrial cable
assemblies to be as dependable as every part of the equipment they control. To minimize downtime, maximize ROI and manage
your operations, you need a cabling system that provides complete control and provides the right data at the right time.
ASC Inc. has earned a solid reputation as a reliable
source for printed circuit boards. Our focus is to provide PCBs for research and development as well as production requirements
for business today. They have the unique ability to adjust to the ever changing schedule in business today, where flexibility
is the key to saving your company time and money in the manufacturing cycle. From prototype to production, the ASC team
will supply a quality product on time. ASC is a reliable manufacturer that will be serving the electronics industry for
many years to come.
is a manufacturer of reliable and effective inrush current limiting thermistor
solutions. Samples available. Located in Carson City, NV, you can contact them at 800-808-2434.
Dilks reported in the August 2013 edition of QST on his opportunity of a lifetime when he received a call from
a friend saying that the producers of the film Paranoia needed some really convincing vintage tube radios as props. John
is the author of the monthly "Vintage Radio" column in the ARRL's flagship publication, and owns a huge collection of exactly
the type of equipment being sought. Paranoia is a saga starring
Harrison Ford and Liam Hemsworth. Per IMDB, "An entry-level employee at a powerful corporation finds himself occupying a
corner office, but at a dangerous price: he must spy on his boss's old mentor to secure for him a multi-billion dollar advantage."
John, his son,
and friend Nick England...
crossword puzzle has an
electrical engineering theme with all the entries being selected from a personally hand-assembled list of words and clues.
Instead of being asked for the names of movie stars and botanical oddities, you need to know electronics, physics, chemistry,
mathematics, mechanics, and other technical stuff. BTW, even though the crossword puzzle titles alternate with terms like
'electrical,' 'wireless,' and 'microwave,' they all use the same dictionary. I only vary titles for SEO purposes.
Wow. If you were a radar technician in the
U.S. Air Force anytime between the 1970s and 1990s, you'll probably want to read
Mike Skees' letter. It is so chock full of names, locations
and dates that you will almost certainly find at least one person you recognize. If your name is not yet on my list of honored
USAF radar techs, please send me an e-mail and I'll be glad to add you.
AWR Corporation, the innovation leader in high-frequency
EDA software, announces that a full slate of activities will be offering during EuMW 2013. Select software demonstrations
to MicroApps to an EU User Group Meeting as well as a PA design lunch and learn with Cree and a Customer Appreciation happy
hour with National Instruments are all in the works. AWR and its parent company of National Instruments will present seven
MicroApps at the EuMW 2013 MicroApps Theater (Stand #109) throughout the week.
voltage standing wave ratio (VSWR) is a fairly common and simple operation
these days with readily available and relatively inexpensive test equipment. Inserting a power meter in series with a signal
to measuring the incident and reflected power, or even simpler, inserting a bidirectional power coupler in series with the
signal and measuring the difference between the forward and reverse ports is a routine matter for even modestly equipped
laboratories, Ham shacks, or field operations. Simply plug the two values into the following equation for the answer:
VSWR=(1 + β)/(1-β), where β=√(Prev/Pfwd). What if all you have is an oscilloscope, then how
would you make the measurement? Actually, the calculation is even simpler...
Detection Log Video Amplifiers (SDLVA) offers 65 dB Dynamic Range over the frequency
range of 315 to 362 MHz. This model offers a fast rise time of 35 nsec maximum and a recovery time of less
than 500 nsec. The unit is temperature compensated such that log accuracy over temperature remains less than ±2.5 dB
over the full operating temperature range of -33 to +77 °C.
SAE is a student design competition organized by SAE International, formerly known as the Society of Automotive Engineers.
Conceived of in 1978 at the University of Houston, the first organized competition was held at the University of Texas at
Austin in 1981 and included only 6 teams. Since then it’s grown into a major event including well over 100 teams from all
over the world. During development of the Electric Vehicle, the MIT team faced many challenges including testing and optimizing
their new electric motor powered drive train. They needed to characterize their motors and turned to the experts at Interface
for help developing an electric motor test stand. After consulting with an Interface application engineer, the HRDT (High Resolution Digital Torque Transducer) with integrated couplings was selected.
Advanced Test Equipment Corp is growing &
expanding!! Established in 1981 ATEC is a worldwide Hi-Tech equipment Rental company seeking energetic individuals to work
in a fast pace environment. Open house will be WEDNESDAY OCTOBER 2nd 9:00am to NOON. All positions are Full-Time perm positions.
For more information see our website at www.atecorp.com
- Inside Sales (Entry level and JR level positions)
- Accounts Receivable Billing Specialist
- Warehouse Shipping & Receiving Clerk
- Calibration Technicians
- SQL Writer
Linx Technologies is pleased to announce its launch
of the GM Series Global Navigation Satellite System (GNSS) receiver module to market. The
GM Series GNSS receiver
module is an autonomous, high-performance Global Satellite Navigation System receiver designed for navigation, asset
tracking and positioning applications of all kinds. Based on the MediaTek chipset, it can simultaneously acquire and track
several satellite constellations. These include the United States GPS system, Europe’s GALILEO, Russia’s GLONASS and Japan’s
An RF Cafe visitor sent me a note about
California Eastern Labs (CEL) shutting down some of their
IC line of components. If you are a user and need to have parts for future production and/or repair, then now is the
time to check in with them or your CEL supplier.
Some people adopt quite literally the expression
'shooting holes' in a theory, argument, or claim. That is definitely the case for video blogger Richard Ryan, who takes
aim at (another firearms expression) an iPhone 5s with his Barrett M82A1 50 caliber sniper rifle. I know from experience performing many
teardowns of phones, wireless routers, Bluetooth devices, etc., that getting the cases open can be challenging - particularly
if your goal is to preserve the integrity of the product - but Mr. Ryan's method does seem a bit extreme. His tactic is
no more shocking than, say, dropping an iPhone 5 in a kitchen blender. The approach used by the folks at RCR Wireless,
Design News, and Chipworks...
LadyBug Technologies announces its new low frequency RF
Power Sensor. The new LB559A-LF1 Sensor adds coverage
below 100 kHz to LadyBug’s laboratory accuracy RF and microwave power sensor portfolio. Designed for calibration, medical
and test applications, the new LB559A-LF1 Sensor includes a powerful full featured Windows GUI application. . Options include
a variety of connector options, support for programmatic measurements, a recorder output, and hardware triggering input
and output. Measurement speed is up to 2,000 measurements per second and the dynamic range is -55 to +20 dBm.
Matt Cochran, who has a
degree in microbiology and is a certified dog trainer, also runs
a disk jockey side business. He just wrote to ask for advice on how to embed playable song sample clips into a web page
so potential customers can listen to music that he has purchased for playing during his gigs. Embedding an audio or video
file is simple, but doing so without violating a copyright requires finding a legal, linkable sample file to call from your
own page. Amazon.com is the perfect source. Although there are undoubtedly other, even better ways of accomplishing the
objective, this one I devised is pretty much bulletproof...
I have written in the past that I have always been a huge proponent
of research and development into all sorts of energy conversion
systems, be they wind, solar, hydro, geothermal, nuclear, hydrocarbon, biomass, chemical, or whatever. What I oppose
and resent is the politicization of the system where people and groups with agendas (that often includes
schemes for enriching and empowering themselves and their crones) feed fallacious and obfuscating data to the public
in order to gain acceptance. The generally tech-ignorant and celebrity-stunned public is sadly all too willing to fall in
line, particularly when convinced (a simple task) that they are being cheated by anyone with
a little bit more than they have, and therefore deserve to have that wealth redistributed...
quiz is based on the information
presented in Chipless RFID Reader Architecture, by Nemai Chandra Karmakar, Randika V. Koswatta, Prasanna Kalansuriya,
and Rubayet E-Azim. Some of these books are available as prizes in the monthly
RF Cafe Giveaway. Graciously provided by
Bird Technologies, a leading provider of
radio frequency based products, systems, and services, today announced that is has acquired DeltaNode
from Scandinavian Health Ltd. for an undisclosed amount of cash. The transaction was completed on September 1. Founded in
2005 by a group of engineers with decades of wireless experience, DeltaNode has since established a strong presence in Europe,
the U.S., and Canada, as a supplier of RF-over-fiber distributed antenna systems and repeaters designed to enhance the coverage
of commercial wireless and public safety communication systems. DeltaNode will continue to operate from its facilities
in Stockholm, Sweden.
Regardless of whether you call it a Lissajous pattern or 'quadrature art,' there is a coolness about feeding signals
into the X and Y axes of an oscilloscope and watching the patterns that emerge on the CRT (or possibly
LCD these days) display. Using static waveshapes can create amazing-enough Etch-A-Sketch type drawings, but animating
the on-screen patterns with time-varying signals into one or both axes really spiffs up the results. This short article
by Russ Williams on the EDN website presents a few simple circuits for generating some of the quadrature art examples shown
in the thumbnail below. A solderless breadboard, quad opamp IC, and a handful of resistors, capacitors, and inductors will
get you started. For test equipment, a simple...
IEEE-USA Today's Engineer Online
is a monthly Web publication devoted to the issues affecting U.S. IEEE members' careers, such as professionalism, management skills, engineering performance, engineering
skills and competencies, product development practices, project management issues, innovation and entrepreneurship, business
- Where Are the Tech
Inside the Box to
- 21st Century Engineering
- Wyoming Recognizes Value
of a Ph.D.
the innovation leader in high-frequency EDA software, announces that for a limited time the company will offer a free eBook
Chapter 18, “Wideband Amplifiers,” from the new second edition of engineering professor Michael Steer's
textbook, Microwave & RF Design: A Systems Approach. The eBook excerpt download also contains embedded video tutorials
of Professor Steer demonstrating key principles of design as they pertain to the wideband amplifier case study contained
within its pages. This second edition is a comprehensive treatment of RF and microwave design for advanced undergraduate
and graduate students (as well as professionals). A key feature of this new edition is the
introduction of real-world case studies developed with AWR’s popular Microwave Office® circuit design software.
NuWaves Engineering, an international
Radio Frequency (RF) and Embedded Systems solutions provider, announced today that the company
has added Castle Microwave as an authorized representative of its commercial off-the-shelf (COTS)
products and design services for the United Kingdom and Ireland. "As a specialist electronics distributor in the UK and
Ireland for over 30 years, Castle Microwave has an impressive track record and a large sales and service footprint," said
Jeff Wells, President and CEO of NuWaves Engineering.
NASA (and its predecessor NACA), and
private and public operators have been monitoring solar events in the optical realm for many decades while attempting to
correlate terrestrial phenomena with it. Auroral light displays in the extreme polar regions have long been known to be
caused by solar flare and coronal
mass ejections (CME). With the advent of radio, the electrical nature of the upper atmosphere
became evident when static and long range propagation affected long range communications. Extreme CME activity eventually
was associated with behavior of the electrical power grid; indeed, massive blackouts and brownouts are to blame for many.
Last but not least came concern for sun-sourced electrons regarding satellites. More than one 'bird' has been smoked by
the sun's ejecta. This November, on Thanksgiving Day, actually, comet ISON...
Dilbert 2.0: 20 Years of Dilbert, by Scott Adams. This special slipcased
collection - weighing in at more than ten pounds with 600 pages and featuring almost 4,000 strips - takes readers behind
the scenes and into the early days of Scott Adams' life pre-Dilbert and on to the success that followed when Dilbert became
an internationally syndicated sensation. Divided into five different epochs, Dilbert 2.0 gives readers a glance at some
of Adams's earliest strips, like those created for Playboy, and a peek at an abundance of special content ranging from numerous
rejection letters to Adams' first cartooning check, and more. Adams personally selected the material for this collection
and offers original comments and humorous asides throughout.
It was not all that long ago when virtually everything
you bought was NOT designed to be thrown away when it broke. Back when ICs, resistors, and capacitors had wire leads and
cases were held together with straight-slot and Phillips head screws rather than the microminiature 'security' type screws,
it was possible for the able and willing repairman to troubleshoot and repair a device or appliance. Now, in a world that
bombards us with admonitions against not being green, practically everything is meant to be thrown away after use - from
cellphones and televisions to clothing and the vast quantity of cardboard and Styrofoam packaging that contains our disposable
goods. For those of us who lived during the aforementioned times and/or those who dabble in vintage electronics either for
hobby or for career necessity, access to data books
can sometimes mean the difference...
"Keynesian economics is the theory that when consumers
don't spend sufficiently, in the opinion of the government, then the government should seize their money and spend it for
them." - Steve Forbes
periodically sends out e-mails that highlight recent key court cases that can significantly affect the effectiveness of
expert testimony, both for the plaintiff and for the defendant. You probably remember seeing headlines last year for "The
Trial of the Century" involving Apple and Samsung. It turns out in the aftermath that the judge ordered public disclosure
of financial records from both parties - against the protestations of both. A superior court ruled, after the
damage had been
done of course, that the judge overstepped her authority. It happens way too often from the benches of all levels. My question
is whether the wronged parties are able to sue the judge and/or governing body for incompetence? Do the judges enjoy self-awarded
unconstitutional protection against retribution? Attorney Robert Ambrogi weighs in on the situation...
Well, to be honest they're not completely free. You do need to fill out an application, so some of your time is required.
Otherwise, though, the publishers pay the cost.
EE Times Europe
Asia Electronics Industry
Wireless Design & Development
There is a huge list of free tech magazines to choose from
besides just these.
is a name widely recognized for his efforts in the 1950s to expose Communist sympathizers in the United States, be they
common citizens or holders of high office. His exploits were routinely dismissed as folly and he was accused of "finding
a Commie behind every rock." The derisive term 'McCarthyism' was used to describe anyone exhibiting supposedly paranoid
obsession with investigating suspected wrong-doing. After many decades of successful application of the charge to shut people
up (like calling someone a racist today), a misfortune befell its libelants. In 1995, the
Venona papers (secret messages between Moscow and its U.S. agents decrypted by our government),
data from Soviet archives and executive-session transcripts of Senate committees were finally opened after a 50-year ban.
The information showed that McCarthy was justified in his suspicions after all. This article, which I ran across while looking
for interesting old stories and advertisements relating to radio and electronics...
Empower RF Systems is a global leader in
RF power amplifier solutions that are critical to defense, commercial,
and industrial market applications. With origins in the design of broadband and band-specific SSPAs, Empower continues to
advance the science of RF power amplification to produce the toughest, most efficient and cost-effective solutions in the
industry. Their priority is to design and deliver high quality, innovative products which solve customer systems and business
This week, as with every week, the
RF Cafe crossword puzzle uses only words
from a custom-built (by me) dictionary of only terms from engineering, mathematics, chemistry,
science, physics, aerospace, electronics, mechanics, astronomy, maritime, sci-fi, and related fields and persons affiliated
therewith. No numbnut clues for Hollywierd actors, fashion designers, psychics, remote villages, etc., will ever be found.
You can get those from the newspaper and practically all online crossword puzzle websites.
3Gmetalworx has been
helping deliver this website to you since 2008. Since 1994, leading wireless electronics companies have relied on 3Gmetalworx
to deliver cutting edge solutions for advanced RF/EMI PCB-level shielding
requirements. From prototyping and design services to JIT manufacturing, 3Gmetalworx provides a seamless service pathway
supporting entire product lifecycle with basic shielding cans,
single-cavity shield sets, and
multi-cavity shield sets.
I normally reserve the radio controlled
(R/C) model news for my AirplanesAndRockets
hobby website, but this is so cool that I know the many former and current military members who visit RF Cafe will appreciate
it. For that matter, so will a lot of non-military members. Here is a video of a very large scale R/C model of the USS Kitty
Hawk aircraft carrier being used as a launch platform for a radio controlled T-38 model airplane. Adding to the cool factor
is the use of an R/C tugboat for pushing the aircraft carrier away from the docks before it gets underway. Per the YouTube
website description, "Our 13-foot USS Kitty Hawk replica
launches her planes to the beach in this RapidNadion adventure. Some aircraft never make it off the deck, and others crash
into the drink due to Kitty Hawk's prototype catapult system...
Anatech Electronics has published its September 2013
newsletter. As always, it includes both company news and some tidbits about relevant industry events, regulations, and standards.
This month Sam Benzacar writes about Wi-Fi encryption, the Land Mobile market, and a new study by the FCC on radio interference.
He also has a short piece titled, "And They Said Someday We Wouldn't Need Filters" (BTW, Anatech
You have probably heard the old (erroneous)
adage, "Ground is ground the world around." That might have been true prior to the advent of electronics, but it certainly
isn't so anymore. Even in the vacuum tube days it wasn't so. Once frequencies get high enough that reactance rivals resistance
for dominance, you can forget about simple grounding concepts for anything other than providing a measure of safety against
electrical shock. This latest installment of EDN's Sherlock Ohms series is an account by John Lombard on his experience
in, "Looking for Common Ground." He begins, "The term 'ground' should be used more carefully. In our equipment,
we distinguish between ground and DC common for good reason. Ground refers to chassis or safety ground to take errant AC
Here is a brief primer on mutual inductance
between inductors (aka coils).
is your circuit's friend if you want it to occur, as with a transformer, or it can be your circuit's mortal enemy if you
don't want it to occur, as when two inductors 'talk' to each other unintentionally because of proximity and relative orientation.
One form of mutual inductance not mentioned here but of utmost importance to radio is that existing between elements in
a directional antenna like a Yagi or log periodic configuration.
Skyworks Solutions today announced that its highly
integrated, low noise amplifier
front-end modules are being leveraged by various OEMs to enable GPS and GNSS in smartphones, tablets and other mobile
devices in emerging markets. Skyworks' modules offer high linearity, excellent gain and an integrated filter, providing
manufacturers with cost-effective, high performance solutions in a compact footprint. These devices are also the first
semiconductors to support China's BeiDou navigation satellite system (BDS), China's second-generation
system that is enabling GPS in consumer platforms.
Foucault Pendulum doodle for today is an animation that
shows the current time according to pegs that have been knocked down by a swinging pendulum, in commemoration of Jean Bernard
Léon Foucault's birthday on September 18, 1819. It is very cool. After watching its motion over a period of many minutes,
the update appears to occur only when the web page is refreshed, rather than with real-time action. I also noticed what
looks like an error in the displayed position of the pendulum on the near side of the peg array that is illustrated in the
screen capture below. Unless the pendulum has just been released, it is impossible for the path to lie between two standing
pegs. The pendulum bob's path should never pass between two standing pegs unless it had just been initially released. Probably
most widely seen Foucault Pendulum is (or was)...
Z-Communications announces a new RoHS compliant VCO model
V600ME45-LF ideal for satellite communication
applications. The V600ME45-LF operates from 3 to 6 GHz with a tuning voltage range of 0-24 Vdc. This octave tuning
VCO features a typical phase noise of -103 dBc/Hz @ 100 kHz offset and an average tuning sensitivity of 147 MHz/V.
The V600ME45-LF is designed to deliver
a typical output power of 6 dBm into a 50 ohm load while operating from a 12 Vdc supply and drawing only
24 mA. Second harmonic suppression better than -12 dBc.
This personal anecdote is
humorous only because I caught my typo before it was
too late to correct it. Whenever an advertiser makes a payment, I always try to remember to send a thank-you note to let
him or her know that payment has been received. The standard e-mail Subject line I use is something like, "RF Cafe: Payment
Received - Thanks!" Hunt-and-peckers like me (yeah, intentional self-deprecation) bear the
burden of having to look at the computer keyboard most of the time whilst typing. Somehow, even with decades of sitting
in front of a computer for hours on most days, the neurons never quite fully connected between my fingers and the word processing
region of my brain. Last week I was typing the Subject line for one of the aforementioned e-mail genres while a Windows
system file update was occurring in the background. Maybe it doesn't happen on Macs, but on PCs...
The original purpose of this note
was to announce a couple post-WWI era U.S.
Air Force recruitment posters that I ran across in Saturday Evening Post magazines of the day, but I got side-tracked.
There is a plethora of old posters available for viewing on the Internet, but I haven't seen these two, which are particularly
directed toward flight officers. Except maybe for a C-130, you probably won't see any propeller-driven aircraft in today's
USAF material. In fact, it was while I was looking for contemporary recruitment posters to test that hunch that I ran across
an entire section of regulations governing the proper - and only official - method of construction the USAF's new (relatively)
wings symbol. The official U.S. Air Force "signature" consists of...
Chipless RFID Reader Architecture, by Nemai Chandra
Karmakar. In the era of information communication technology , RFID has been going through tremendous development. RFID
technology has the potential of replacing barcodes due to its large information carrying capacity, flexibility in operations,
and applications. The deployment of RFID has been hindered by its cost. However, with the advent of low powered ICs, energy
scavenging techniques, and low-cost chipless tags, RFID technology has achieved significant development. This book addresses
the new reader architecture, presents fundamentals of chipless RFID systems, and covers protocols.
Published by Artech House.
Interface has been the trusted
world leader in force measurement for half a century - from grams to millions of pounds, in hundreds of configurations.
We are the preeminent supplier to companies such as Boeing, Airbus, NASA, Ford, GM, NIST and thousands of measurement labs.
Our load cells are complimented by highly accurate torque transducers,
machine calibration systems,
digital indicators, software, and force measurement. Our in-house
and repair labs support a variety test standards.
Comdel has been supporting RF Cafe for five years.
Comdel designs and manufactures RF and DC power supplies and process
instruments for the semiconductor, solar cell/photovoltaics, flat panel, and industrial heating industries. Comdel products
are in use worldwide by the industry’s major equipment and IC fab manufacturers. Please consider them for your design needs.
Anatoli Bugorski has the distinction of being the
only person known to have placed part of his body in the path of a high energy proton particle beam ...and lived. At the
time, he was working as a researcher at Russia's Institute for High Energy Physics, on the U-70 synchrotron. While troubleshooting
a malfunctioning piece of equipment on 13 July 1978, he stuck his head directly in the path of the proton beam. Mr. Bugorski
reported that he saw a flash "brighter than a thousand suns," but did not feel any pain. The scenario reminds me of the
story I've told before about a guy I worked with in the USAF who inadvertently put is head in front of a transmitting S-band
radar antenna feed horn and reported hearing a loud hum in his ears. In both cases safety interlocking mechanisms were believed
to have been properly...
Electric cars are good business for electrical
and electronics engineers from a multitude of standpoints, and since they are being imposed upon us - ready or not - it
might be a good idea to figure out how you can position yourself to benefit from them career-wise. Power generation and
distribution engineering has always been a well-paying, challenging aspect of electrical engineering. Control systems, battery
management, brushless motors, navigation systems (including collision avoidance and self-navigation),
and vehicle power and signal distribution are all technical realms needed to make an electric vehicle fleet viable. All
are in their infancy relative to automobiles built for internal combustion engines. Many IC vendors are already designing
products specifically to address needs of electric vehicles. As an increasing number of electric-only cars
(compared to Prius types whose gasoline engine charges the battery) are put into primary service,
the nation's grid is going to feel the stress. In fact, our electricity generation and distribution system is already under
severe stress and it is only through impression, near super-human efforts of planners and engineers that blackouts...
NuWaves Engineering is a premier supplier of
RF Systems, Subsystems, RF Products and
Engineering Design Services designed to customer requirements. They
are a turnkey provider for RF and microwave communication custom designs with full project management and design responsibilities;
taking ownership from the conceptual idea to production.
Those of you who are not particularly interested in
old electronic equipment
will please indulge those of us who are. I post these articles occasionally to remind people of from whence we have come.
Whether you are an amateur radio operator or just a cellphone user, appreciation is due to the pioneers who took the metaphorical
arrows for us so that we may enjoy the micro-size, low cost, high quality communications available today. The full-height
equipment racks in the photos were standard fare in the 1930s for long distance (DX) shortwave
operators - often only for CW (Morse code). "User serviceable parts inside' was the rule rather
than the exception. As much as I like waxing nostalgic over tube-based hardware of yesteryear, I am quite grateful to be
typing this note on a computer keyboard and not on a massive teletype machine.
"If you have a truly new idea, you don't have to
worry about people stealing it. You will have to pound it into their heads." -
John A. O'Keefe, assistant chief of
the Theoretical Division at NASA's Goddard Space Flight Center from 1958-1974.