Compliance 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.
NuWaves Engineering announces
the release of the NuPower Xtender™ Linear Bidirectional S-Band Power Amplifier module, model number
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
Hogan's 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...
The 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...
PMI Model No.
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.
Orbel 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.
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."
Unlike 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...
Receiving 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.
Before 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.
"The 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
Cabe Atwell, Contributing Editor, Design Hardware & Software for Design News, has an interesting
report on the latest effort to
redefine the Kelvin 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 link.
AWR 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.
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.
Take 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.
"Engineers 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...
As 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.
Measurement System Tests AESA
Radar T/R Modules at High Speed
Triple Beat IMD Measurement Over
4G-LTE Bands: Can You Really Avoid the Cavity Filters?
Struggling with Amplifier
Bias Sequencing? Try a Positive Approach
GaN Technology Enables Gain
Blocks With Muscle
DiTom 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.
Test 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!
White 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 covered.
How to Measure 5 ns
Rise/Fall Time on an RF
Best Practices for Making the
Most Accurate Radar Pulse
Time Spectrum Analysis
Determination of Capacitor
Life as a Function of
Operating Voltage &
the Lowest Possible
This 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 the 'pyroelectric'
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.
Anatech 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
A new application note
from AWR highlights the use of AWR's Microwave Office 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.
Most 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 console radio.
Antennas 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.
RIGOL's 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!
11th 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
a 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.
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.
This quiz is based on the information presented in
Antennas and 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
Polyphase 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 simulation
Take 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 you.
The 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:
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
"K-System" 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
Videos 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.
7CL5125-1490-CD-SFF 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".