Testing, LLC, located in Chandler, Arizona, has been providing worldwide compliance testing for FCC, IC and CE
marks for over 40 years. We are able to offer services for the U.S., Canada, European Union, Australia/New
Zealand, Korea and Japan and many others. There are currently
Compliance Test Engineer
and LabView Programmer
positions available for qualified candidates.
Engineering announces the release of the NuPower Xtender™ Linear Bidirectional S-Band Power Amplifier module,
NW-LBSSPA-10W-2.2-2.5, designed for use with half-duplex RF transceivers operating amplitude-modulated waveforms
(e.g. OFDM, QAM). The product is the first linearized model to come from the company’s
new Xtender series of bidirectional power amplifiers, which are based on the successful NuPower™ broadband, high-efficiency,
miniature PA module product line. Leveraging analog pre-distortion techniques to maximize power efficiency and
reduce power back-off requirements, the Xtender Linear Bidirectional S-Band PA generates 6 Watts of average
RF output power from 2200 to 2500 MHz, given a 10 dB PAPR waveform.
Heroes is my all-time favorite TV show. I have the complete DVD collection, and every time Melanie makes a German
meal for dinner (sauerbraten, bratwurst, wiener schnitzel, potato pancakes - yum!),
we turn on the boob tube and watch an episode of Hogan's Heroes whilst eating. Today, while searching for tech
headlines, I ran across an article on the EE Times website titled, "Magnetic Wire Recorders Rule!" Author
Max Maxfield, who comes up with a lot of good topics and has written about wire recorders in the past, relates
a story about an engineer who built a high-quality version of a wire recorder using modern components. The engineer
believes his grandfather might have been at least partially responsible for a wire recorder experimenter's kit
that was advertised in a 1949 issue of Wireless World. The company, Park Radio, claimed it would be, "More thrilling
than Radio -- More gripping than Television." I've seen...
UK's BBC produced a short video showing what goes on in the cellphone
recycling center operated in south London. I was surprised to see the amount of manual labor that goes into
processing each device. Shipments of 20 to 30 thousand handsets are received each month from all over the world.
The first step is to classify each phone for dispositioning either for resale to 3rd-world countries, for cannibalization
for useful working parts, or for junking after removing hazardous components and precious metals. Phones are sorted
by make and model, then electrically tested for degree of functionality. Having disassembled quite a few handsets
in my days of competitive analysis, I can tell you that doing so without harming components can take skill that
is only acquired through experience. Since everything from the outer...
Model No. P4T-100M40G-90-T-512-292FF-SP
is a 100 MHz to 40 GHz, Ultra-Compact, High Speed, Single Pole, Four Throw, Absorptive Switch. This
switch offers over 100 dB of port to port isolation from 100 MHz to 18 GHz, over 90 dB from
18 to 26.5 GHz and over 75 dB from 26.5 to 40 GHz. This switch has a typical insertion loss of
8.8 dB from 100 MHz to 18 GHz, 5.2 dB from 18 to 26.5 GHz and 5.6 dB from 26.5 to
40 GHz. The switching speed is less than 100 nsec and is controlled by 2-Bit decoded TTL. The maximum
operating power is +20 dBm.
Corp. is the leading designer and manufacturer of
RF Shielding and EMI/RFI Isolation Products
for printed circuit boards and electronic enclosures. Orbel also specializes in thin gauge
Photo Etched Metal Parts
and Precision Metal Stampings made
from a wide variety of material options.
a big comic strip reader.
Dilbert, of course, is required reading. The Erie Times-News
paper has a weenie collection of comics, so I have to go online for most of my favorites. Here is a unique collection
of full-color Sunday strips. "Since Dilbert was first syndicated in 1989, Adams has built a following that would
be the envy of any corporate sales and marketing team. His work not only generates howls from readers as they
rush to plaster it on lunch-room refrigerators and scan it into interoffice e-mails, it has those same fans reading
about "their" workplaces every Sunday in a multiple-panel, color format. And that's what this treasury, The Collected
Dilbert Sundays, provides."
X-rays which can penetrate metal and bone (potentially causing harm in the process),
T-rays are in the electromagnetic spectrum lying between
infrared and microwave. They can "see through" soft tissue, fabric, low density wood, and other low density materials.
Researchers at Caltech figured out a way to integrate a complete transmitter, receiver, and phased array antenna
onto a single silicon substrate. In doing so they were able to produce enough power in the THz band to enable
imaging of high density objects within low density objects. The thumbnail above shows a handgun round and a #11
X-Acto blade buried within a stuffed dog. Super-low production costs will make them cheap to integrate into cellphones
and specific-purpose scanners. Privacy is about to take yet another hit as stores, office buildings, public areas,
and just about any venue will be saturated with these kinds of devices. Metal pins in your bones, plates in your
head, dental fillings, and hidden body piercing will be easily imaged by anyone with a so-equipped phone. Get
ready for images...
information wirelessly or even over a wire is taken for granted today, but 80 years ago it was considered a miracle
of God - that's what Alexander Graham Bell called it. Some regarded it as being of the devil. The same is true
of today's omnipresent communications - some consider it a blessing while others call it a curse. I'm somewhere
in the middle. In 1934, the telecommunications world was in its heyday of growth with a reported
17 million listeners of AM radio
(no FM yet). Radio dealers and servicemen were gearing up for customers with unbridled
enthusiasm for the fledgling commercial broadcast industry's offerings. Even in the midst of the Great Depression,
people were joining in on the wireless craze in large numbers, and amateur radio operators were almost feared
for their awesome ability to comprehend and practice the black art of antennas and radio receivers.
the Internet, cellphone apps, and personal computers, many calculations began with a lookup table, chart, or nomograph.
In the case of long distance
radio operators seeking distance and direction information for pointing antennas, it took a map like this
one published by Radio News & Short-Wave magazine in 1934. Distance are all relative to New York
(NYers have always considered themselves the center of the universe
so operators in other locales need to compensate. Here is one example of many online
great circle calculators that
allow you to enter two sets of longitude and latitude.
theory of a relativistic universe is the hostile work of the agents of fascism. It is the revolting propaganda
of a moribund, counter-revolutionary ideology." -- Astronomical Journal of the Soviet Union, quoted in
The American Mercury, March 1940
Atwell, Contributing Editor, Design Hardware & Software for Design News, has an interesting report
on the latest effort to
by derivation from a new value of the Boltzmann constant. It's a quick read with a good explanation of the process
and result. Hat tip to Joe Cahak of
Sunshine Design for the
has added three venues in India to its AWR Design Forum
(ADF) 2013 tour: Ahmedabad on Tuesday, August 20th Hyderabad on Thursday, August
22nd Bangalore on Friday, August 23. The AWR Design Forum is an open event at which designers of microwave and
RF circuits and systems can network, share useful information, and collaborate on industry issues and trends.
International Corporation (NIC) has been helping deliver RF Cafe since 2009. NIC is a designer and manufacturer
of RF & microwave components including filters, amplifiers,
frequency sources, assemblies for military, commercial & space. Lumped, ceramic, crystal, cavity, combline &
interdigital filters, filter/amplifiers, filter/limiters, and switched filter banks.
a break and work this week's electrical
engineering themed crossword puzzle. All the words are pulled from a hand-built list of terms, names, and
abbreviations that have only to do with science, mathematics, and engineering. If you want a crossword with names
of movie stars and obscure countries, try the local newspaper. If you want to exercise your nerd knowledge, this
is the one for you.
Get Rich as Talent War Heats Up." That's the title of a story on Yahoo! Finance website, dated July 25, 2013.
According to the author, it's a job-seeker's market out there for engineers - not for all engineers necessarily,
but certainly for those with expertise in the energy exploration, capturing, and generation businesses. In spite
of the politicians' best efforts to kill the carbon-based fuel markets, the world's high demand for electricity
and fuel has created a boom in fields other than just the government-approved "renewable" energy schemes like
wind and solar power. No sooner were Congress and White House occupants congratulating themselves for ongoing
success in utterly killing the coal industry when the advent of modernized hydraulic fracturing
('fracking') for extraction of shale gas rose suddenly and positively in the public
and corporate eyes as the new potential economic savior...
usual, Microwave Product Digest has a slew of good articles this month. Here are links to them for your
edification. No, I don't get paid to promote them.
Tests AESA Radar T/R Modules at High Speed
Triple Beat IMD Measurement
Over 4G-LTE Bands: Can You Really Avoid the Cavity Filters?
Amplifier Bias Sequencing? Try a Positive Approach
Enables Gain Blocks With Muscle
Microwave designs and manufactures (in California) high quality
connectorized ferrite isolators and circulators for the space
and defense markets. Their business was established in 1987 and since the inception has shipped over 250,000 ferrite
devices to customers all around the world. Connectorized single and dual junction ferrite isolators and circulators
for the space and defense markets out their specialty. COTS and Hi-Reliability products available covering 700 MHz
to 31 GHz.
Parts is America's RF & microwave super store. They sell both new and quality used
RF & microwave communication parts, routinely stocking more than
35,000 'hard-to-find' parts as well as standard attenuators, couplers, dividers, adapters, waveguide,
test equipment, coaxial switches, and vacuum tubes. Test Parts acquires high-end, superior quality products, then
offers a substantial reduction from the retail price. Save up to 75% off retail!
papers published by manufacturers are often some of the best concise treatments of specific topics because the
engineers and technicians that write them are intimately involved in the design and manufacturing of the items
How to Measure 5 ns
Rise/Fall Time on an RF
Best Practices for Making the
Most Accurate Radar Pulse
Determination of Capacitor
Life as a Function of
Operating Voltage &
Solution for Achieving
Lowest Possible Receiver
Tackling Multi-Bit Attenuator
is part 8 in a series published by Radio News and the Short-Wave magazine in the early 1930s. As with most topics
pertaining to electronics, the theory is still relevant and applicable to many modern circuits and systems. Piezoelectric
principles are introduced for determining the frequency of oscillators. I have to admit to not having heard of
effect. A pyroelectric crystal when heated or cooled develops charges on the extremities of its hemihedral
(another new word for me, meaning "exhibiting only half the faces required for complete
symmetry") axes. read on to learn more.
Electronics has introduced three new RF components:
a weatherized 907.5 MHz cavity bandpass filter, surface-mount 5725 MHz ceramic bandpass filter, and
a high-power 800-2170 MHz 30-dB dual directional coupler.
new application note from AWR highlights the use of AWR's
circuit design software to develop a Q- to E-band doubler and a K- to E-band quadrupler circuit
(including a medium E-band power amplifier) for millimeter-wave wireless systems.
The design effort resulted in an increase in gain as well as output power, two critical criteria for E-band systems.
people agree that World War II marked the point at which a large percentage of American women made a major
move from the role of homemaker to the roles of factory and trades workers. The societal shift was made necessary
because a large percentage of American men were off fighting the war in Europe and the South Pacific, and therefore
were not available to do those tasks. This article appeared in the September 1942 edition of Radio Retailing
Today magazine less than a year into America's involvement in the War. Even a militant feminist would probably
conclude that, given the state of the world at the time, it is a very fair assessment and generally exceedingly
complimentary. Note this observation regarding use of women for manufacturing, "Women
have made more radio tubes and radio sets than men ever will." I thought about that recently while preparing
for the restoration of my
1941 Crosley Model 03CB
and Site Engineering for Mobile Radio Networks, by Bruno Delorme. This is the first book to discuss the specific
antennas used in cellular and
Private Mobile Radio (PMR) networks. These are the
antennas located on pylons in rural areas and tubular masts on rooftops in more populated areas. The book presents
essential information for engineers, managers, and technicians working for mobile phone equipment manufacturers,
network integrators, and antenna installation companies. This is the subject of
RF Cafe Quiz #51.
premium line of products includes digital oscilloscopes, RF
spectrum analyzers, digital multimeters, function / arbitrary waveform generators, digital programmable power
supplies, HPLC and UV-Vis Spectrophotometers, which help the engineers, researchers, educators to address their
measurement challenges in confidence with affordability than even before. Very affordable!
Military Antennas, September 17 - 18, 2013 - Washington Plaza, Washington, D.C. IDGA's Military Antennas East
Summit will address the evolving development of antennas as an ever-critical component of all military communication
capabilities; in doing so, it will delve into the development of Ground, Air, Sea, and Space-based antennas, along
with software radios, vehicle communications, and SATCOM. It will also uncover the newest in antenna technology,
including small wideband antennas, metamaterial antennas, GPS programs, superconducting RF systems, adaptable
RF, and more.
in geniuses is not unusual, and accordingly neither is a propensity to make goofy statements. Wireless pioneer
Guglielmo Marconi was no exception. Dig this little piece I ran across
1934 edition of Radio News and The Short-Wave, "Marconi Calls 'Electric Woman' Genuine." "ROME - Marchese
Guglielmo Marconi, famous radio inventor and scientist, said today there was no doubt as to the authenticity of
the phenomena of the 'electric woman' Signora Anna Monaro, according to the Times. From Signora Monaro's breasts,
several times nightly while she sleeps, there emanates enough light to illuminate a room, it is said." It sounds
like she's really lighting up somebody's life.
Highly Complex Product Design and Development within MilAero. Outsourcing, especially of printed circuit board
assemblies, is a common realization throughout the Military and Aerospace industry. Becoming even more common
is the expansion of higher level sub-assemblies and assemblies – either as components or as new product introductions
(NPIs) in their entirety. Organizations are managing the increasing complexity,
especially with their outsourced design and manufacturing partners.
quiz is based on the information presented in
Site Engineering for Mobile Radio Networks, by Bruno Delorme. It is the first book to discuss the specific
antennas used in cellular and Private Mobile Radio (PMR) networks. These are the
antennas located on pylons in rural areas and tubular masts on rooftops in more populated areas.
Artech House graciously
provided this book. Note: Some of these books are available as prizes in the monthly
RF Cafe Giveaway.
Microwave has a wide selection of stocked specialty
Mixers, Quadrature (I&Q) Modulators and Demodulators,
single-sideband modulators, image-reject mixers, including models in a caseless configuration. Download
QMSIM, their free quadrature modulator
a break and work this week's wireless engineering
themed crossword puzzle. All the words are pulled from a hand-built list of terms, names, and abbreviations
that have only to do with science, mathematics, and engineering. If you want a crossword with names of movie stars
and obscure countries, try the local newspaper. If you want to exercise your nerd knowledge, this is the one for
folks at Rev Response have a pretty big collection of whitepapers on a very wide range of subjects that are free
for downloading. Well, not quite free - they do require you to sign in, but no $$$ is involved. I make a few pennies
on each download, so you're helping to support RF Cafe if you participate. Here are a few of the newer ones that
might interest you:
can go to just about any store these days and buy a tube of RTV (room
temperature vulcanizing) rubber caulk. That was not the case as recently as the 1960s and 70s (assuming you're
old enough to consider that recent). Here is a short news item about how Dow Corning Corporation's breakthrough
new compound was set to revolutionize hermetic sealing of critical electronic assemblies. It shows entire subassemblies
of connectors, wires, and discrete components (no ICs at the time) completely engulfed in the stuff. I remember
at Westinghouse Electric, where I worked as a technician after a tour in the USAF, we used RTV for sealing bulkhead-mounted
connectors on torpedo heads and towed sonar arrays. We also used massive quantities of it to seal off molds
for ceramic transducer element arrays prior to potting them with a polyurethane compound. That was cool work.
The heavy aluminum molds, about 6-feet long, were placed in a huge, thick-walled aluminum tube and a vacuum was
pulled while the compound was curing in order to eliminate trapped bubbles. After about 6 hours of non-stop, tedious
labor, it was as close as a male can come to experiencing the joy of birth when removing the arrays...
Boeing B-52 Stratofortress long-range bomber has been in continuous service since 1954. Production of new aircraft
ran from 1952 through 1962. Now59 years hence at version 'H,' it is still our nation's primary long-range bomber.
That is a great testimony to the aircraft's initial design and construction, but a sad testimony to our ability
to design and build a complete replacement. The B-1 bomber was a dismal failure and the B-2 Stealth bomber is
too expensive to build and maintain in large quantities. This story from a 1957 edition of Radio & Television
News reports on the
computerized bombsight gear installed in early B-52s that used radar for targeting. According to the writer,
nearly 1,000,000 American defense company workers at companies like General Motors, Eastman Kodak, General Mills...
of automated factory fabrication and assembly lines are awesome. Watching the robots sling metal panels around
for presses using hundreds of thousands of pounds of pressure to stamp out body panels for the Tesla Model S
electric car is an inspiring reminder of how ingenuous and capable our fellow homo sapiens can be in spite of
politicians' best efforts to enslave an underclass voting bloc of slackers. Think of the amount of knowledge required
to conceive of and execute the processes show in this video - metallurgy, robotics, software, production planning,
material sourcing and handling, factory environment, structural analysis, safety, testing, budgeting, training,
union demands, human concerns, massive governmental regulation, surface finishing, marketing, work flow, and a
host of other issues. That doesn't even include the brainpower necessary to plan, design, test, and build all
the electrical and electronics parts of the vehicle. Utterly amazing. It takes 3-5 days from beginning to end
to build a Model S. Even back in the 'old days' when most of the labor was manual, film reels showing masses
of humans working together to make a complex piece of machinery like a Ford Model T will bring a tear to
the eye of any self-respecting tech aficionado.
is a band pass filter centered at 5125 MHz and has a nominal bandwidth of 1490 MHz. This filter
provides over 40 dB of rejection between 3.0 to 3.658 GHz and between 6.65 to 7.3 GHz and over of
rejection between 1.5 to 2.5 GHz. This filter has a low insertion loss of less than 1 dB and measures
1.9" x 0.875" x 0.5".