The April 1969 issue of Electronics World
included a large number of articles on the topic of filter design and use. Included were
titles such as "LC Filters," "Practical Operating Limits for Filters," "Filters for Microwave,"
" Crystal Filters," and others were contributed by experts in the field from industry
and academia. This article on the use of
ferrite beads for blocking RF signals is more of a sidebar note than an article,
but it's still worthy of inclusion. Ferrite beads and toroids are still widely employed
for stopping radio frequency interference (RFI) on everything from AC power cords to
Most people who were around in the 1970s remember
the sitcom "Laverne &
Shirley." It was popular as a part of the whole 1950s renaissance that was happening
with shows like "Happy Days," "Grease," "American Graffiti," et al, that captured the
attention of the parents of we teenagers as well as weselves[sic]. I was being held against
my will at Southern Senior High School at the time, and many of the kids adopted a "greaser"
lifestyle that included cigarette packs rolled up in t-shirt sleeves and Brylcreem in
the hair (mainly just the guys), leather jackets and
Keds high-top sneakers (guys and gals), and poodle skirts and saddle
Oxford shoes (mainly just the gals). Two weirdo characters, Lenny and Squiggy, made cameo ...
"C-band satellite service provider SES recently told the FCC that
if it wants a more accurate database of satellite earth stations, it should streamline
the registration framework to make it simpler and more affordable. As revealed in a Dec.
7 ex parte filing (PDF), SES met with FCC staff on Dec. 5 to discuss midband spectrum
and the history of C-band satellite. SES emphasized the benefit of C-band satellite capacity
not only to cable operators but to other media industry members as well, explaining that
virtually all of the video and audio programming ..."
Impedance matching of high-frequency components
is a key part of
antenna design that ensures maximum transfer of power between the
antenna and the transmitter / receiver circuitry. Antennas can be tuned to resonate at
the desired frequencies much more quickly and efficiently by first designing a matching
circuit rather than by making modifications to the antenna's physical dimensions. A new
application example describes a unique design flow using NI AWR Design Environment Microwave ...
"Military avionics experts at the Boeing Co. are
moving forward with a project to upgrade the cockpits of U.S. Air Force
E-3 Sentry radar aircraft with modern commercially available, digital
electronics under terms of a $46.3M order announced Thursday. Officials of the Air Force
Life Cycle Management Center at Hanscom Air Force Base, are asking the Boeing Defense,
Space & Security segment in Oklahoma City to continue work on the E-3 Airborne Warning
and Control System (AWACS) Diminishing Manufacturing Sources ..."
"Light made on CMOS chips using
quantum tunneling could be used for optical interconnect and chemical
sensing, according to physicists at King's College London. Kings College gold nano-rod
tunneling The technique involves constructing a ~1 nm gap between two metal electrodes
(see diagram), and then using a potential difference to promote electron tunneling across
the gap. This tunneling occurs in two forms: elastic and inelastic, King's physicist
Dr Pan Wang told ..."
"There are four main types of
magnets: ceramic (ferrite), AlNiCo, Samarium Cobalt (SmCo), and Neodymium
(NdFeB). The latter is one of the most commonly used in motors for hybrids vehicles and
EVs. Neodymium magnets have higher remanence, along with much higher coercivity and energy
production, but often lower Curie temperature than other types. Special neodymium magnet
alloys that include terbium and dysprosium have been developed with higher Curie ..."
NASA's Jet Propulsion Laboratory issued the following
notice from their NASA Spinoff Database:
Power Amplifiers Boost Radar, Communications, Defense Systems. As a subcontractor
under an SBIR contract from the Jet Propulsion Laboratory,
Inc. of Torrance, California, developed a solid-state power amplifier of unprecedented
efficiency. While most comparable devices lose 20% of their amplified energy when their
signals recombine, QuinStar's lose 8%. The solid-state technology ...
At least 10 clues in this puzzle with an asterisk
(*) are pulled from this past week's (12/11 - 12/15) "Tech Industry
Headlines" column on the RF Cafe homepage (see the Headline Archives page for help).
For the sake of all the avid
cruciverbalists amongst us, each week I create a new technology-themed crossword
puzzle using only words related to engineering, science, mathematics, chemistry, physics,
astronomy, etc. Enjoy ...
Fairview Microwave, a supplier of on-demand microwave
and RF components, has launched a new series of
waveguide to coax adapters that cover a frequency range of 1.7 GHz
to 110 GHz in 22 waveguide bands. Typical applications include test benches, instrumentation,
high efficiency RF/Microwave transmission, MILCOM, SATCOM, radar and telecom. Fairview's
new line of waveguide to coax adapters consists of 77 models in sizes of WR-10 to WR-430.
These adapters are offered in a wide selection of waveguide flanges, sizes and materials.
They support 10 ...
IEEE has published its "Patent Power 2017" review of the world's companies'
patent portfolios and the influence wielded thereby. The web page
includes an interactive table and chart that includes 18 industry scorecards with the
top 20 companies in each sector. The thumbnail shown here is with everyone involved,
but you can filter out non-relevant (per your definition)
industries. Circle size indicated relative patent power for a given country. The U.S.
still dominates overall. Apple is the figurative 800-lb. gorilla of electronics patents.
Honeywell "owns" aerospace and defense (which surprises me). Intel leads in semiconductors.
MIT rules in university patents. Take a look ...
"Researchers have developed a
cloaking concept based on electromagnetic forces that could eliminate an object's
wake, greatly reducing its drag while simultaneously helping it avoid detection. The
idea originated at Duke University in 2011 when researchers outlined the general concept.
By matching the acceleration of the surrounding water to an object's movement, it would
theoretically be possible to greatly increase its propulsion efficiency while leaving
For most needs to measure voltage, current, and
resistance, modern users of test equipment do not need to give much thought to the electrical
characteristics of the instrument being used. Other than setting the function switch
to the proper position (ohms, volts, amps, milliamps, etc.) and not exceeding the safe
measurement accuracy can usually be assumed to be good to within ±2 to ±5
of the least significant displayed digit. I.e., if the digital display shows 10.000,
then the actual value is likely in the range of 9.995 to 10.005. Autoranging even removes ...
is pleased to share the news and congratulate
Dr. Thomas Weller, the company's co-founder, on being named IEEE Fellow by the Institute
of Electrical and Electronics Engineers. This high designation is given by the IEEE Board
of Directors to persons having a history of significant accomplishments in the fields
of electrical engineering. Dr. Weller has been recognized for his extensive contributions
in the area of advanced RF and microwave modeling techniques for surface ...
"Electromagnetic interference (EMI) is an increasingly
important topic across the global
electronics manufacturing supply chain. Progressively smaller geometries
of ICs, lower supply voltages, and higher data rates all make devices and processes more
vulnerable to EMI. Electrical noise, EMI-induced signal generated by equipment, and factors
such as power line transients affect manufacturing processes, from wafer handling to
wire bonding to PCB assembly and test, causing millions of dollars in losses ..."
When I read this installment of Mac's Service
Shop, in Popular Electronics magazine, the first thing that came to mind was
my own experience with
television interference (TVI) when I was a kid. In that case, the transmitter of
my radio control system for a model airplane was the culprit. The frequencies and channels
are almost exactly the same as reported in this infodrama. In the 1970s, citizen band
(CB) radios operated in the 27 MHz realm, as did my R/C transmitter. During summer
vacation from junior high and high school, I would run my model airplanes up down the
street in front of my house, getting up just enough speed to lift off and then immediately ...
Why Engineers Need to Pay More Attention to Fonts
Ericsson Wins Comprehensive 5G Contract from Verizon
FCC Proposes $25,000 Fine for Breaking Now-Voluntary Labeling Rules
The Sun is Blank, NASA Data Shows It to Be Dimming
Americans Spending More as the Holiday Season Continues
Researchers Report New Way to Make Dissolving Electronics
Microsoft Asserts Windows Gaining Ground in Education Market
FCC Proposes Penalty for Marketing of Improperly Labeled Radio Devices
Undersea Communications Cables Vulnerable to Sabotage
Your Smartphone as Medicine: Digital Therapy Here to Stay
FCC Grants Greater Access to Spectrum Above 24 GHz for Wireless
"Two satellite beams (or more) are better than
one when it comes to data transfer and anti-jamming measures between satellites and drones.
At least that's what last month's first successful test of beam-switching technology
on an MQ-9 Predator drone seemed to show. Over the course of the testing, the drone flew
1,075 nautical miles and was able to switch smoothly between two
spot beams multiple times throughout the trial. While traditional
wide-beam satellites use one beam to cover thousands of miles, the satellites ..."
You will probably chuckle at the sight of the printed
circuit board being an example used in an article about
high density PCB production. However, in 1969 it was heralded as leading edge technology.
Remember, though, that surface mount components the size of a grain of salt were unheard
of so such a board probably represents a bunch of leaded components being closely packed
together with the biggest concern for density being heating / cooling issues. Part of
the big deal with this board, when you read the article, is that it is one of eight that
were produced on the same substrate and then singulated ...
"Chip makers appreciate what most consumers never
knew: silicon's virtues include the fact that it 'rusts' in a way that insulates its tiny circuitry. Two new ultrathin
materials share that trait and outdo silicon in other ways that make them promising materials
for electronics of the future. Facebook Twitter Email By Andrew Myers The next generation
of feature-filled and energy-efficient electronics will require computer chips just a
few atoms thick. For all its positive attributes, trusty ...
"Ideas alone have little worth. The value of an
invention lies in its practical implementation." -
Werner von Siemens, 1865. The unit of electrical conductance is named
Other than today's QST magazine being
a larger format and being printed in full color, there is not much difference fundamentally
between the amount of Christmas-themed company advertisements now and half a century
ago. Those from the last century were more likely to incorporate a religious message
in addition to or instead of a secular message to their customers.
Terminal Radio Corporation was located in midtown Manhattan. Google Maps can find
West 45th Street and it can find Cortlandt Street, but they evidently no ...
"The Department of Defense spent $7.4B in fiscal
year 2017 on cloud computing, big data and artificial intelligence technologies, according
to a recent report by public-sector contracting analytics firm Govini. That represents
32% increase since 2012, with more specific technologies like quantum
computing, virtual reality and machine learning seeing some of the bigger boosts in investment.
While cloud, AI and big data all saw spending jump over the past five years, AI accounted
for the bulk of the increase in spending ..."
"A lot of people think that
high-energy lasers, or HELs, can't penetrate fog, rain and dust,
said Thomas Webber, director of the Directed Energy Division's Technical Center, U.S.
Army Space and Missile Defense Command. That's just plain wrong. The key to making HELs
work in poor atmospheric conditions is something called "adaptive optics," he said, adding
that the Army is continuing to make more and more improvements on its adaptive optics