Today in Science History -
This line from the Basic Navy Training
Courses is very important when considering electrical machines: Many electrical
devices and machines operate on the principle of "transformer
action." They in fact are not transformers - but the theory of their operation
is best explained by considering them as if they were transformers. It is part of
chapter 21, entitled, "Some Electrical Machines - Transformer Action," which provides
a simple introduction to induction motors and generators, regulators, frequency
converters, and synchros. If you are a newcomer to the field of electricity and/or
electronics, or if you just want to brush up on old knowledge to be conversant at
office parties, this is a great short read. A quiz is provided at the end ...
"The U.S. Air Force has deployed 20 missiles
which can zap enemy electronics with powerful pulses rendering weapons virtually
useless. They can be launched into enemy airspace at low altitude and emit blasts
of high-power microwave energy that immediately disable any devices targeted. The
Counter-Electronics High Power Microwave Advanced
Missile Project (CHAMP) is the brainchild of Boeing's Phantom Works lab. They
have not been operation until now and could be used to frazzle the military defences
of Iran and North Korea, reports DailyMail.com. News of the state-of-the-art weapons
- which are carried into battle by B-2 stealth bomber ..."
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After many years of reading
Mac's Service Shop sagas, a persistent theme seems to be Barney's refusing to
refer to equipment schematics while troubleshooting, thereby often wasting valuable
time. According to business owner and electronics sage Mac McGregor, assuming that
what is typical for most sets will apply to all sets can and does create a fertile
environment for frustration - and profit loss. Mac's advice to check "simple things
first," has always been my troubleshooting philosophy - maybe because identifying
the "hard things" has nearly been my undoing many times when the trouble is not
simple. One of first things I do is check switches, connectors, and user-accessible
potentiometers for proper operation (when potentially responsible for the problem,
of course). I've written many times about how often a dirty connector is the culprit ...
If you need to design just about any filter
type ever conceived, then Nuhertz Technologies probably has software that can do it. The
really big dollar microwave design software suites from Keysight and NI/AWR have
synthesis tools, but if you only need to design filters, look no farther. Jeffrey
Kahler has an article in MWJ entitled, "Complete Filter Design with Discrete Elements Made
Easy," that gives some insight into Nuhertz's capabilities, but you'll want
to visit their website to learn of the amazing depth and breadth of filter synthesis
tools available. They also have many application notes that might be useful. A free
trial and university versions are available ...
Anatech Electronics, an RF and microwave
filter company, has introduced a new line of suspended stripline and waveguide type
RF filters. Also, Sam Benzacar wrote as part of his May newsletter an article entitled
Marches Forward, Unnoticed," which focuses on how advances in Wi-Fi are being
made to address contemporary needs, while the news industry and subsequently users
are largely unaware of the changes. 802.11ax, rebranded as Wi-Fi 6 by the Wi-Fi
Alliance, provides data rate increases up to 37% over 802.11ac. Increased range
and higher device connection counts, needed to cover large venues without extenders,
is a big part of the performance enhancement ...
OK, class, put your books away and take out
a pencil. Spread your chairs out because we're going to have a short test today.
A collective sigh permeates the room. Remember those days? I still have nightmares
over those moments, and they were decades ago for me. At least this "Electronic
Noise Quiz" from the August 1962 edition of Popular Electronics won't
affect your GPA. Sometimes PE's quiz illustrations are kind of hard to interpret,
but this one does a pretty good job (except item 'E', but I'm not telling what it
is since nobody helped me). You will need a fairly diverse background in consumer
type electronics to do well, and having a few gray hairs will probably help as well.
Good luck. BTW, my score was a somewhat embarrassing 80% ...
"SpaceX CEO Elon Musk tweeted out a picture
of 60 of SpaceX's secret
Starlink satellites packed into a Falcon rocket,
ready to be launched this week in the first major test deployment of SpaceX's satellite-based
internet intrastructure. Starlink Satellites Ready for Launch On Twitter this week,
Elon Musk showed off 60 of SpaceX's new Starlink satellites being packed onto a
Falcon rocket in advance of this week's mission to test the deployment of the satellites
into low Earth orbit. In a series of tweets, Elon Musk showed off the satellites
along with a similar picture of SpaceX's Starman just prior to its launch into space ..."
KR Electronics designs and manufactures high
quality filters for both the commercial and military markets. KR Electronics' line
of filters includes lowpass,
highpass, bandpass, bandstop and individually synthesized filters for special applications
- both commercial and military. State of the art computer synthesis, analysis and
test methods are used to meet the most challenging specifications. All common connector
types and package form factors are available. Please visit their website today to
see how they might be of assistance ...
This "Recent Developments in Electronics"
from a 1960 issue of Electronics World had a lot of
antenna news that included a retarded surface wave antenna with high gain and
low silhouette for use in airborne early warning radar as well as ground based and
shipboard radar, a pair of 60-foot tropospheric scatter antennas that are specially
mounted at opposite ends of a 180-mile long section of the Gulf of Mexico, and a
104-foot-long rotating 50-ton radar antenna used for the SAGE early warning system.
Also reported was Westinghouse Electric's airborne Stratovision for broadcasting
educational television programming to rural areas out of reach of existing towers ...
Empower RF Systems is a global leader in
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at similar frequencies and power levels
Any Star Trek fan would immediately recognize
this as Mr. Scott's "transparent aluminum." "In materials science, achromatic optical
components can be designed with high transparency and low dispersion. Materials
scientists have shown that although metals are highly opaque, densely packed arrays
of metallic nanoparticles with more than 75% metal by volume can become more transparent
to infrared radiation than dielectrics such as germanium. Such arrays can form effective
dielectrics that are virtually dispersion-free across ultra-broadband ranges of
wavelengths to engineer a variety of next-generation metamaterial-based optical
The 1950s was a time when futurists were predicting
domestic robots would be common place items in households. By the turn of the
century, mankind, freed from the drudgery of manual labor, would have plenty of
time for recreating, resting, and sitting around brainstorming the next big thing.
Here it is 12 years into the new century and at the most, a fraction of a percent
of the population even has a Vroom robotic floor vacuum - and it looks nothing like
a human. This comic from the November 1957 Popular Electronics exemplifies the visions
of the last century. Now, maybe by the end of the 21st century we'll finally be ...
Rohde & Schwarz introduces their "This
Changes Everything" promotion which allows customers to purchase its oscilloscopes,
spectrum analyzers, power supplies and power analyzers each fully equipped with
the maximum bandwidth, channels, inputs, memory interfaces and signal generation
for one affordable, unrivaled price. The promotion runs May 20 through December
31, 2019. Customers who might need to budget for future upgrades based on design
needs can maximize their investment up front, making purchasing easier and less
expensive. Save up to $10,000 on full-solution instruments. Gone are the days of
keycode upgrades ...
Air Force says a ground-based laser downed multiple test missiles over New Mexico.
A successful ground test has moved the U.S. military one big step closer to putting
anti-missile lasers on its aircraft. A ground-based laser shot down 'several' missiles
in flight during an April 23 test at the White Sands Missile Range in New Mexico,
Air Force officials said. Run by the Air Force Research Laboratory, or AFRL, the
test was part of the
Self-Protect High Energy Laser Demonstrator,
or SHiELD, a program intended to protect aircraft from incoming missiles. AFRL officials
said security reasons prevented them from saying how many missiles were downed in
the test. The laser that the Air Force lab used for the test was ground-based ..."
Innovative Power Products (IPP) has over
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Sometime around 1980, while stationed at
Robins AFB, Georgia, I finally succumbed to the peer pressure of other more sophisticated
audiophiles in the barracks and bought a "real" stereo. Unlike my roommate who had
a full compliment of rack-mounted gear, my meager enlisted military pay only allowed
for a mid-grade instrument. The solution was a
Sansui TA−300 Integrated Tuner Amplifier. It put out a whopping 30 watts per
channel, but unlike my existing radio (a Readers Digest 800−XR), those 30 watts
were nearly distortion free when driving good speakers. Having only the pathetic
5 W speakers that came with the 800-XR, I designed a set of speakers rated
for 60 W, and built the enclosures myself in the base woodshop. Unfortunately,
in preparation for a household move about 20 years ago, I sold the Sansui and the
This is a nice short article covering the
calculation of inductances for coils wound on cores and wire sizes. It appeared
in a 1932 issue of Short Wave Craft, but of course inductance has not changed
since then so it is still relevant. The author recognized that standard formulas,
although concise and accurate, are sometimes difficult to work with when calculations
for a large number of values is needed for a particular circuit design. To address
the situation, he presents a handy nomograph, chart, and a table of typical values.
He also introduces a rarely seen term "Nagaoka's correction factor*" for skin effect.
A smartphone app, a spreadsheet, or a desktop computer program would be used today
to calculate inductance ...