Electro-Photonics LLC announces the availability
of a connectorized hybrid coupler: Q3XG-1500R-SMA. Our new Q3XG-1500R-SMA
90° hybrid coupler operates from 1000-2000 MHz, dissipates 65 W,
and offers excellent coupling flatness and isolation for the most critical applications.
This coupler has an extremely small package of 1.60 x 1.10 inches (40.64 mm x 27.94
mm). The Q3XG-1500R-SMA is manufactured in the USA, and is RoHS compliant...
This week's
Microwave and RF Engineering crossword puzzle contains the usual
collection of science, math, and engineering terms. Each week for more than two
decades I have created a new technology-themed crossword puzzle using only words
(1,000s of them) from my custom-created lexicon related to engineering, science,
mathematics, chemistry, physics, astronomy, etc. You will never find among the words
names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything
of the sort. You might, however, find someone or something in the otherwise excluded
list directly related to this puzzle's technology theme, such as Hedy Lamarr or
the Bikini Atoll, respectively. Avid cruciverbalists amongst us: the gauntlet has
been thrown down.
Martin Rowe, EE Times' senior technical editor,
has posted another in his series of Friday quizzes, this time on
Signal Conditioning. "Most sensors can't connect directly to a
measurement system because the signal amplitudes are too low or are nonlinear. Some
sensors also require excitation, in the form of a power supply. The questions for
this week's quiz test your knowledge of that you need to condition several types
of sensors. To find the answers and learn more about physical..."
When one of
Google's self-driving vehicles is pulled over, who gets the ticket?
The passenger or the car? The question was asked across the Internet on Thursday,
after a police officer stopped one of the gumball-machine-shaped vehicles on El
Camino Real. In a blog post, the Mountain View Police Department said the officer
noticed traffic backing up behind a slow-moving car in the eastbound No. 3 lane,
near Rengstorff Avenue. The vehicle was traveling at 24 mph in a 35 mph zone. "As
the officer approached the slow-moving..."
NI (formerly AWR Corporation)
announces the agenda has been set and registration opened for its annual combined
AWR Design Forum (ADF) 2015 /
German
User Group meeting being held November 26, 2015 at the NI European Headquarters
in Munich. Celebrating its fifth year, ADF is an open forum that brings together
NI AWR software customers, partners and microwave/RF engineering professionals to
learn, network and collaborate on the design of today's microwave and RF circuits
and systems. Highlights of ADF include technical presentations featuring NI AWR
Design Environment™ and select customer and keynote...
Don't let the title fool you. This is not
a "bees-birds-and-flowers routine" being provided to Barney by his boss, Mac. It
turns out to be a brief introduction into the fine art of
troubleshooting intermittent problems in radio and television
circuits. As is usually the case, while the specifics of the scenarios Mac describes
might not apply to your challenge at hand, the general philosophy always does. It
is basically the old process of elimination where after rapping components mechanically
and/or heating or cooling them in hopes of observing a tell-tale change in performance,
the next step is to divide the suspected circuit portion in half (electrically,
but sometimes also physically) and look in one direction. If the problem isn't there,
then...
RCD
is vertically integrated to design, manufacture, and test high-quality
RF components - filters, amplifiers,
couplers, dividers, attenuator - using a variety of manufacturing processes. Specific
RF or mechanical requirements to suit customer needs addressed, including high port-to-port
isolation requirements, low ohmic losses, high power, and PIM levels. Components
currently offered in 70 MHz – 5 GHz frequency range. Decades of applicable industry
experience in this particular field and look forward to working with you towards
a comprehensive solution to your specific needs. +420-466-415-755.
With headquarters in Dublin, CA, and production
facilities in Shenzhen, China, Asian Circuits Inc., a contract
PCB assembly company ,
is an expert in mid- and high-run printed
circuit
card assembly. Its staff of 600 consists of 450 associates in PCB fabrication
and 150 in circuit board assembly. It is an ISO9001, IPC-A600 and IPC A610 compliant
company. • PCB Online Quote: An instant PCB price can be quoted after selection
of a few options. • PCB Assembly Quote: An additional instant quote for the cost
of labor. • BOM Pricing: Get price within 24 hours. Please take a few moments to
visit Asian Circuits today in appreciation of their support...
"Planes and warships just got a lot harder
to see with microwave radar. A group of scientists from China may have created a
stealth material that could make future fighter jets very difficult
to detect by some of today's most cutting-edge anti-stealth radar. The researchers
developed a new material they say can defeat microwave radar at ultrahigh frequencies,
or UHF. Such material is usually too thick to be applied to aircraft like fighter
jets, but this new material is thin enough for military aircraft, ships, and other..."
Bird Technologies, a leading provider of RF components,
subsystems, test equipment, and services, today introduced the
614 Series digital signal boosters designed to increase the signal
strength of land-mobile and public safety communications systems operating at either
450 to 470 MHz or 470 MHz to 488 MHz. The highly configurable system combines the
benefits of programmable digital RF filters, the cryptographic and other security
benefits of the SNMPv3 control protocol, browser-based configuration and management,
the ability to view changes to filter characteristics while viewing...
If you dread the thought of your kid coming
home some day with a mere tattoo or body piercing, it will seem tame compared to
this. "A group of 'biohackers' in Germany has implanted LED lights under their skin.
The men each had a Northstar V1 chip - which is about the size of a large coin -
implanted into their hands. The chip features a ring of LED lights and is designed
to be able to light up tattoos from beneath the skin, emulating the bioluminescence
of jellyfish..."
When I grow up, I want to be like Joel Hallas
(W1ZR) - at least when it comes to a fundamental comprehension
of antennas and transmission lines. Mr. Hallas' "The Doctor Is In" column is
the first QST feature I read each month. His book, "Basic Antennas, is a comprehensive introduction to antennas--basic
concepts, practical designs, and details of easy-to-build antennas. You'll learn
how to make antennas that really work! This book will provide a foundation in antenna
theory and design necessary for anyone undertaking more advanced topics such as
those presented in The ARRL Antenna Book. Includes: Dipole Antennas, Antenna Impedance,
Transmission Lines, Practical Two Element Arrays, Wideband and Multiband Antennas
Reflector Antennas, Yagis for HF..."
Saelig Company has announced the availability
of Rigol DSG800 RF
Signal Generators, with output frequencies from 9 kHz to 3.0 GHz.
They provide an economical RF signal source with a maximum output of +20 dBm
and frequency resolution of 0.01 Hz at any frequency. Featuring very low SSB
noise of -115 dBc/Hz, they feature a highly stable internal clock (<2ppm
standard, 5ppb optional) for creating high performance RF test signals. Operation
is easy and intuitive, guided by the 3.5" color LCD with its logically grouped controls...
Please take a moment to visit Empower RF Systems to see whether their top-notch
RF power amplifier
systems would be useful in your next project. Empower RF Systems is a global
leader in power amplifier solutions. Products include high power RF amplifier modules,
amplifier systems, and custom designed amplifiers. Investments in both hardware
and software engineering are yielding next generation products with significant
size, weight, and interface functionality advantages over legacy products in the
market...
This Veterans Day
(Remembrance Day in Canada and
Australia)
tribute is by Canadian citizen Terry Kelly.
A Pittance of Time was written after an experience he had on Veterans Day
in 1999. Terry went blind at an early age, but has excelled as an athlete and a
musician. It is done in the finest Celtic tradition ... and, of course, Lee Greenwood's-
God Bless
the USA , written 7 years before 9/11.
"Take two minutes, would you mind?
It's a pittance of time, For the boys and the girls who go over. In peacetime our
best still don battle dress, And lay their lives on the line. It's a pittance of
time."
The saga continues... Please bear with me
even if you have no interest in the much-hyped (at the time) history of the advent
of
all-metal vacuum tubes in the mid 1930s. They were predicted to
make glass-encased tubes obsolete. It never happened. Believe it or not, there are
a few folks out there (like moi) who like reading about the history. Posting this
on the RF Cafe homepage helps the search engines find and register it faster. If
you also happen to care, then you might be interested to know this article was...
"The postmodernists are right about science,
just up to the point that they are terribly wrong. Let me offer a piece of advice.
Never get on an airplane designed by a postmodernist! Scientific knowledge deserves
special status for an obvious reason: Science works. When you need real answers,
nothing else even comes close." -
Jeff Hester, columnist, November 2015 Astronomy magazine.
In Compliance magazine is a great
source for technical articles that cover the realms of electrical, electronics,
and RF & microwave engineering. I visit their website a few times each week
in search for headlines and relevant pieces like this one authored by Ken Javor.
"A Radio Frequency Application of Critical Damping Theory and Practice"
includes many photographs of his test setup and screen captures from his Rohde &
Schwarz EMI Test Receiver measurements. "EMC is sometimes termed the study of secondary
effects that are ignored in college curricula. This investigation hinges on subtle
effects mostly ignored during EMI testing..."
Please visit Windfreak Technologies now to determine whether their frequency
synthesizer products can help your project. Windfreak Technologies designs, manufactures,
tests and sells high value USB powered and controlled radio frequency products such
as RF Signal Generators,
RF Synthesizers, RF Power Detectors, RF Mixers, RF Upconverters and RF
downconverters. Worldwide customers include
Europe, Australia, and Asia.
Today's
Google homepage features one of their famous Doodles that honors the accomplishments
of Austrian-born actress Hedy Lamarr. You might wonder why I would point this out on an
engineering website. Here's why: Aside from being one of the most well-known film
stars of her era, Ms. Lamarr was also an inventor and received U.S. patent number
US2292387 jointly with composer / pianist Antheil George for a "Secret Communication
System." We refer to her invention today as frequency-hopping spread spectrum.
Given that Google is heavily invested in spread spectrum technology and the company
is staffed with some of the world's top engineers, it is no wonder the Google Doodle
dedicates more than half of the presentation to Hedy Lamarr's technical accomplishments...
"When the definitive history of the personal
computer is written, familiar and historic names such as Olivetti, Apple, IBM, will
all be given recognition for their innovations of the 1960s and 1970s. But will
future generations remember visionary
John Blankenbaker,
and his ground-breaking invention, the Kenbak-1 Digital Computer? It was a machine
that first went on sale in 1971 and is considered to have been the world's first
'commercially available personal computer,' coming on to the market some five years
before Apple 1..."
A
vertical antenna can have a significant advantage over a horizontal
antenna from a maintenance perspective, since, depending on how high the antenna
is mounted off the ground, the "business end" where electrical connections are made
are more accessible. The configuration shown here would be difficult to implement
if a mast rotator is to be used because of the stabilizing guy wires on the lower
frame. Although it should be possible to achieve the necessary rigidity without
guys by using an aluminum or fiberglass tubing frame rather than wood, preventing
weathervaning in strong winds could prove difficult. A nifty feature of this "reversible
beam" antenna is that reciprocal directivity is implemented simply by swapping out
a short...
CST and Davide Tallini offer this free seminar
on Thursday, December 3, 2015 at 11:00 am EST. "Starting from the
free-space radiation performance of each antenna, the problem
to predict the global installed radiation pattern, antenna to antenna coupling in
presence of a spacecraft has to be treated in order to identify potential blind
areas or interferences caused by the neighboring structures. The prediction of electromagnetic
field scattered in complex environment is usually a hard task since the solution
cannot be generally expressed in a simple and/or closed analytical form...
"Art installations
are being more interactive as they seek to not only entertain but teach. Dutch
artist Jeroen Bisscheroux's latest installation is no to exception to this as his
massive megaphones pick up on all the surrounding sounds of the Vincent van Gogh
College in Assen, the Netherlands. The art piece entitled
TOON, consists of three large metal horns facing different directions
but connected by a central pipe collecting all the acoustics. The central pipe..."
Not many people are still using analog meters
for making voltage, current, resistance, and power measurements these days; however,
for those who are and even for those using digital readout meters, there are valuable
lessons to be learned from this article on factors that can affect the accuracy
of your measurements. Whenever you
make a measurement with any kind of instrument, the first step
to take in minimizing the chances of inaccurate readings is to be certain the instrument
is in good working order and is known to be reasonably accurate. If it is battery
powered, know that low battery voltage can cause erroneous readings in both analog
and digital meters, so beware. If you are making a measurement to verify a known...
Here is another short test equipment quiz
by EE Times. Senior technical editor Martin Rowe says about this is a
oscilloscopes quiz. "We seem to have an endless supply of quiz
questions about oscilloscopes. This week's questions were submitted by Steve Sandler
from his book, Power Integrity: Measuring, Optimizing, and Troubleshooting Power-Related
Parameters in Electronics Systems. Steve submitted more questions than
appear in this quiz, so look for yet another set of questions from him..."
This week's
Wireless Engineering crossword puzzle contains the usual collection
of science, math, and engineering terms. Also included are a couple topics that
have been in the technical news headlines lately and the names of two new companies
advertising on RF Cafe (clues labeled with asterisk *).
As always, this crossword contains no names of politicians, mountain ranges,
exotic foods or plants, movie stars, or anything of the sort unless it/he/she is
related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska
event in Siberia). The technically inclined cruciverbalists amongst us will
appreciate the effort. Enjoy!
"From laptops and televisions to smartphones
and tablets, semiconductors have made advanced electronics possible. These types
of devices are so pervasive, in fact, that Northwestern Engineering's Matthew Grayson
says we are living in the 'Semiconductor Age.' 'There are so many applications for semiconductor
materials, so it's important that that we can characterize these materials carefully
and accurately. Non-uniform semiconductors lead to computer chips that fail, lasers
that burn out..."
Electro-Photonics
LLC is a global supplier of RF & Microwave components. Their products include SMT hybrid
and directional couplers, wire bondable passive components, and very useful test
boards for evaluating components. The Electro-Photonics team can support your small
R&D design requirements with RF & Microwave test fixtures and save you valuable
design and characterization time. Please take a
little time now to visit Electro-Photonics'
website to see whether they can help your effort.
While you're there, check out their TRL Calculator.
"Movies such as 1987's 'Predator,' in which
an alien who sees in the infrared hunts down Arnold Schwarzenegger and his team,
introduced a generation of sci-fi fans to thermal imaging. Since then, heat-sensing
devices have found many real-word applications but have remained relatively expensive
and rigid. But a new development featuring graphene, reported in ACS' journal Nano
Letters, could lead to a flexible, transparent and low-cost infrared vision system
..."
Andy T., from Wilson, Wyoming, was one of
the October book
drawing winner, Andy wisely selected
EW 104: EW Against a New Generation of Threats, by David L. Adamy
(graciously provided by
Artech House).
Each month I randomly draw a name or two from the list of people who have purchased
my software during the month. I even pay shipping so the book are
truly free to winners. My other, Sylvain F., from Blagnac, France winner has not
replied yet.
QST
columnist Larry Wolfgang had an eye-opening report in his November 2015 "Technical
Correspondence" column. He discusses the in-situ testing of handheld transceivers
at the ARRL Hamvention. ARRL
Laboratory Engineers did a spurious emissions test using a calibrated setup to anyone
wanting to submit his/her unit for evaluation. To make a short story even shorter,
Most brands' handset passed handily, but two brands in particular - Baofeng and
Wouxun - consistently for the last 4 years had a significant percentage of noncompliant
units in bands below the 225 MHz (spec cut-off). Some
were really bad. Don't shoot the messenger. Caveat emptor!
"A pair of 'mesh reflectors' used to boost capacity on the U.S. Navy's space-based
mobile phone network have deployed successfully on the newest satellite in the constellation,
antenna manufacturer Harris Corp. announced this week. The unfurling antennas were
launched September 2 aboard the fourth payload in the Navy's constellation of Mobile
User Objective System (MUOS) satellites. Built by Lockheed Martin, the MUOS..."
Qorvo (formerly RFMD)
has published two new books under the very popular "... for Dummies®"
instructional series produced by John Wiley & Sons, Inc. One is titled "RF Filter Applications
for Dummies®" and the other is "RF Filter Technologies
for Dummies®." As you might expect, these books are basically
advertisements for Qorvo, but that's OK because they contain useful information and
they are made available for FREE. Per the Qorvo website: "These two books explain
how various filtering technologies, including Qorvo's LowDrift™ and NoDrift™ filters,
address unique...
"In 1958, US satellite Explorer 1 transmitted
valuable information about radiation back from above the Earth. Professor
James Van Allen discovered a group of charged particles which
were creating two distinct belts of radiation. These belts appeared to be protecting
the planet from harmful space particles and are now known as the Van Allen radiation
belts. Scientists wanted to know more about it and that's when things got weird.
They sit in a toroidal or donut shape around the planet but the..."
Ian Poole, of the
Radio-Electronics
website, has produced an excellent video tutorial on the subject of
envelope
tracking usage in modern radios (aka cellphones). A combination of clear diagrams,
interviews with design engineers, and live screen shots of signal behavior is used
to effectively illustrate the principles without going into gory mathematical detail.
If you have ever wondered why cellphone power amplifier (PA) companies like Qorvo
(RFMD), Skyworks, and Peregrine also make and sell DC-DC converter and DC power
management ICs, this video will answer the question....
"Researchers at the University of Wisconsin-Madison
(UW-Madison) have developed
a flexible phototransistor based on single-crystalline silicon nanomembranes (Si
NM). They claim that this phototransistor is the fastest and most flexible one
ever produced. The flexible phototransistor could be incorporated into a wide range
of applications. In a digital camera, for example, it could result in a thinner
lens that would capture images faster and yield higher quality still..."
RR Media - Teleport has an opening for an RF
Engineer. The position requirements include but are not limited to: Planning, execution,
control and maintenance of technical TX (uplinks) & RX (downlinks.) Independent
worker; capable of leading projects; shows initiative in a challenging and dynamic
work environment; testing, QA & deployment of new technologies; Supervision
and execution of antenna building and dismantling; Installation and maintenance
of RF cables (indoors and outdoors); installation of external downlink gear and
wiring it to the compression room and uplink gear from the compression room...
As with so many topics, the basics of
topics like
harmonic distortion (and other forms of distortion) in an amplifier circuit
has not changed much - if at all - over the decades. Test equipment and circuits
being measured get more advanced, but, especially if you are new to the concept,
articles like this one on audio-frequency distortion from a 1941 edition of
Radio-Craft magazine are as useful today as it was when it was written.
When studying, in particular, harmonic distortion, having a knowledge of the
Fourier series for common waveforms like triangle waves, sawtooth waves, square
waves, and even a semi-circle- shaped wave is especially enlightening since it
explains a lot of waveform shapes where harmonics are present...
It's
been a lot of work with a steep learning curve, but at long last the first
RF Cafe App
is now available for download from the Google Play website! An iPhone version will
probably be created if my motivation level is elevated enough by a huge number of
downloads for this Android version. This first release is meant to 'test the waters'
for the usefulness of an app whose purpose is to provide reference material rather
than a collection of calculators. Whether you are in the lab, at your desk doing
design work, or operating in the field, there are times when you need data. These
first few screens are some of the most often needed information. If enough support
is received, the RF Cafe App can be greatly expanded into a vast volume of formulas,
sketches, tables, definitions, and other encyclopedic content not...
"Seifer's vivid, revelatory, exhaustively
researched biography rescues pioneer inventor
Nikola Tesla from cult status and restores him to his rightful
place as a principal architect of the modern age. Based largely on firsthand documents
including Tesla's writings, his patents and those of competitors, it credits the
Croatian-born Serb, who moved to New York in 1884, with the invention of the induction
motor, long-distance electrical power distribution, fluorescent and neon lights,
the first true radio tube and remote control, besides making vital contributions
to the technology underlying television, wireless communication, robotics, lasers,
the facsimile machine and particle-beam weaponry anticipating the space-based "Star
Wars" defensive shield. Though often depicted as a recluse, flamboyant nouveau-riche
Tesla..."
Precision Connector, Inc.,
located in Franklin, IN, has been added to the
RF Connectors, Adapters, Sockets, & Terminal Blocks Manufacturers &
Services listing page on RF Cafe. Precision Connectors designs and manufactures
precision RF and Microwave coaxial connectors for both military and commercial applications.
A full line of common coaxial connectors are available, including 1.0mm, 1.8mm,
2.4mm, 2.92mm, 3.5mm, SSMA, SMA, SMPM, SMP, TNC, and N, along with in-series and
inter-series adapters. Please contact them at 317-346-0029 for assistance...
"Runners, mariners, airmen, and wilderness
trekkers beware: Your
global positioning system (GPS) is flattering you, telling you
that you have run, sailed, flown, or walked significantly farther than you actually
have. And it's not the GPS's fault, or yours. Blame the statistics of measurement.
Researchers at the University of Salzburg (UoS), Salzburg Forschungsgesellchaft
(SFG), and the Delft University of Technology have done the math to prove that the
distance measured by GPS over..."
As I have written in a couple articles recently,
there was a huge push in the mid 1930s to adopt the revolutionary new
metal-encased vacuum tubes over established glass-encased tubes.
Today, interest in vacuum tube amplifiers is building among audio enthusiasts both
from a nostalgic perspective and from a long-perpetuated belief that sound from
vacuum tube circuits have a distinctively richer quality than that of solid state
devices. I post this stuff for the benefit of those who otherwise might not be able
to find the information otherwise. Your patience indulgence is appreciated...
While working on vacuum tube based USAF air
traffic control radar and radio systems, and having seen many tube television and
radio sets I never recall seeing one of these form-fitting
metal shields. All the ones I've seen are simple cylinders that
slide over the tube and either twist into a receiving rim slot or they have spring
metal fingers that grab the glass envelope. As you might guess, utilizing a metal
shield around a tube for anything other than a low frequency application like an
audio amplifier or poser supply requires circuit design that takes into account
the capacitive effects of the large metal plates...
"Anything that's always connected, always
sending data—that's something a nearby attacker can latch on to," says
Craig Young, senior security researcher at the risk management
firm Tripwire, as quoted in October 2015 issue of This Old House magazine column
"How to Hack-Proof Your Smart Home."
Washington Technology just published its
list of the
Top 100 Government Contractors for 2015 in terms of total taxpayer
dollars awarded for contracts in IT, systems integration, engineering, and professional
services (i.e., defense).
1: Lockheed Martin, $11.7B
2: Northrop Grumman, $6.89B
3: Boeing, $5.26B
4: Raytheon, $4.82B
5: General Dynamics, $4.07B
6: Hewlett Packard, $3.87B
7: Booz Allen Hamilton, $3.67B
8: SAIC, $2.57B
9: Harris, $2.55B
Total contract value for 2015 is $98.5B. That's a lot of wampum, but the amount
is down about 25% from 2011 levels. Consider that the total
Federal welfare budget in 2013 was about $1Trillion
(10x the above).
Leads projects and provides technical direction
to and coordinates the efforts of engineers and technical support staff in the performance
of assigned projects. Develops and applies advanced Radio Frequency engineering
theories, methods and research techniques in the investigation and solution of complex
technical problems and projects. Supports senior technical level personnel and program
managers in the planning, oversight, and execution of complex and advanced projects
related to system and technical product development. Typically supports multiple
project activities and may support multiple programs within the organization. Provides
technical guidance and mentoring to lower level technical...
everything RF has introduced a new technology
hub for the SATCOM
Sector. This is a single page on the site which summarizes all activity that
takes place in this industry. News, White Papers, New Products and more. Two new
categories for the SATCOM Industry have been added to everything RF -
Block
Up Converters (BUC) and
Low
Noise Blocks (LNBs). Products from the leading manufacturers in each of these
categories have been listed and users can find products here based on specification...
New York City has forever, it seems, been
the place to be for street vending. A famously large pedestrian populace creates
an ideal venue for hacking goods of all sorts to passers-by. A phenomenon in radio
was created in the early 1930s with the rapid advances in technology and high volume
manufacturing techniques, coupled with increasingly efficient transportation of
goods on interconnecting roadways and delivery trucks. The photos included in this
Radio-Craft magazine story illustrate the level of enthusiasm by the public for
radio. A plethora of
replacement components for repairing malfunctioning sets and for
scratch-built sets at fantastically low prices helped fuel the fire. An offer of
"aluminum chassis" with pre-punched and drilled holes was really surprising not
because of the holes, but for...
Rohde & Schwarz has successfully closed fiscal
year 2014/2015. Order income was 6.1 percent higher than in the previous year, with
revenue up 4.1 percent. With its advanced technologies and trailblazing products,
the electronics group was able to maintain its leading market position. Business
development focused on test and measurement and secure communications. In addition,
the group substantially expanded its cybersecurity activities.
"Starting next year, three mobile network
operators in Indonesia will begin testing Google's Project Loon balloon powered
Internet. Over the next few years,
Google said
that it hopes that Loon will help put LTE based internet connections within reach
of more than 100 million Indonesians. In Indonesia today, only about 1 out of every
3 people are connected to the web, and most of their connections are often slow.
Many people live in areas without existing Internet infrastructure; on an archipelago..."
Writing about "outdated" methods of radio-based
facsimile machine implementation in 1934 seems a bit incredible considering how
relatively new both technologies were at the time. Nevertheless, Radio-Craft
magazine editor
Hugo Gernsback reported on the new era of
fax machines that were on display at the 1933 World's Fair in
Chicago. Of course fax machines of that time were not exactly desktop models that
could be located in a corner of your office or cubicle (not that cubicles were common).
If you substitute transistors for vacuum tubes, stepper motors for simple DC motors
and solenoids, and solid state lasers and LEDs for incandescent light sources, the
fundamentals have not...
Development of the
cavity magnetron during World War II helped change the destiny
of Allied forces as high frequency radar with enough power to detect distant targets
while being out of the easy detection bands of Axis forces' receivers. It was considered
a top-level secret with great concern that the technology not fall into the hands
of German and Japanese scientists. According to this early post-war advertisement
in Radio News magazine, Bell Labs was totally consumed by the development of magnetrons,
and was relieved to finally be able to boast of its critical role now that the war...
It's confession time. While it is true that
all of the
RF Cafe crossword puzzles contain only words, abbreviations, and
phrases that pertain to topics in engineering, radar, radio, science, mathematics,
astronomy, chemistry, etc., the actual title of the puzzle is made up mainly to
look attractive to search engines. There are puzzles, however, with titles like
"Famous Scientists" where I do go through and specifically fit
in names of people like DeForest, Einstein, Edison, Bell, et al. This crossword
falls into the former category...
