Today in Science History -
Here is a specially constructed crossword
puzzle in honor of our fallen service members for this
Memorial Day. Since 2000, I have been creating custom engineering- and science-themed
crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors
who are fellow cruciverbalists. The jury is out on whether or not this type of mental
challenge helps keep your gray matter from atrophying in old age, but it certainly
helps maintain your vocabulary and cognitive skills at all ages. A database of thousands
of words has been built up over the years and contains only clues and terms associated
with engineering, science, physical, astronomy, mathematics, chemistry, etc. You
will never find a word taxing your knowledge of a numbnut soap opera star or ...
Exploiting the electronic nature of living
organisms through contrived application and manipulation of electric currents has
been a goal of researchers (and quacks) ever since Luigi Galvani first discovered
that connecting a battery lead to a frog's leg would cause it to kick.
Psychogavanic reflex (PGR) is the technical term for the science. Once it was
determined that all forms of fauna would respond to electrical stimulation, it wasn't
long before the same sort of treatment was applied to all forms of flora. Many people
(not me, for the record*) believe that talking to plants can influence their health
and growth, so why not - so goes the reasoning - try electric currents as well.
We all know from spy, war, sci-fi, and horror movies that under ...
Anatech Electronics (AEI) manufactures and
supplies RF and microwave filters for military and commercial communication
systems, providing standard LP, HP, BP, BS, notch, diplexer, and custom RF filters,
and RF products. Standard RF filter and cable assembly products are published in
our website database for ease of procurement. Custom RF filters designs are used
when a standard cannot be found, or the requirements dictate a custom approach.
Sam Benzacar's monthly newsletters address contemporary wireless subjects. Please
visit Anatech today to see how they can help your project succeed ...
This is yet another example of humorous -
and clever - poetry written by Hams from back in the 1940s... November 1942, to
be exact. It appeared in the ARRL magazine QST. As alluded to in the title,
"Ravin," it is a play on Edgar
Allen Poe's famous "The Raven" poem. A few other electronic-themed poems are listed
on the page as well, discovered in QST and in Popular Electronics.
Alliance Test sells
used / refurbished
test equipment and offers short- and long-term rentals. They also offer repair,
maintenance and calibration. Prices discounted up to 80% off list price. Agilent/HP,
Tektronix, Anritsu, Fluke, R&S and other major brands. A global organization
with ability to source hard to find equipment through our network of suppliers.
Please visit Allied Test Equipment today to see how they can help your project
Personal note: Alastair is one of the nicest
guys you'll ever work with. "Anokiwave, an innovative company providing highly integrated
IC solutions for millimeter-wave (mmW) markets and Active Antenna based solutions,
today announced the latest addition to its executive leadership team with the appointment
Alastair Upton to the position of Chief Strategy
Officer, a new position within Anokiwave, effective May 2019. Mr. Upton will report
directly to Chief Executive Officer, Robert Donahue. As the Anokiwave CSO, Alastair
will be responsible for developing and executing Anokiwave's business strategy in
all key markets, including responsibility for the strategic marketing organization,
driving the company product roadmaps, and managing partnership ..."
"As far as we know, Earth's
magnetic north has always wandered, but it has
recently gained new momentum and is making a dash towards Siberia at a pace not
seen before. While this has some practical implications, scientists believe that
this sprint is being caused by tussling magnetic blobs deep below our feet. Unlike
our geographic North Pole, which is in a fixed location, magnetic north wanders.
This has been known since it was first measured in 1831, and subsequently mapped
drifting slowly from the Canadian Arctic towards Siberia. One of the practical consequences
of this is that the World Magnetic Model has to be updated periodically with the
pole's current location. The model is vital for many navigational ..."
Please take a few moments to
everythingRF website to see how they can assist
you with your project. everythingRF is a product discovery platform for RF and microwave
products and services. They currently have 227,460 products from more than 1210
companies across 285 categories in their database and enable engineers to search
for them using their customized parametric search tool. Amplifiers, test equipment,
power couplers and dividers, coaxial connectors, waveguide, antennas, filters, mixers,
power supplies, and everything else. Please visit everythingRF today to see how
they can help you ...
A few months ago, one of America's big-city
mayors made the proclamation, "We're not going to make America great again. It was
never that great." There has been a big push in the last decade to not only erase
significant accomplishments and sacrifices of America's and Western Europe's
past, but to vilify those people and institutions that make up that past. Purging
the records and rewriting history is a tried and true method of assuring few have
easy access to archival material documenting the accomplishments of the nation's
past. Along with desiring to provide useful and interesting material to people seeking
technical and historical information, my motivation ...
A supporting company representative requested
that I update the website
traffic statistics chart with current information since the old one was a year
old. Wow, tempus fugit. April 2019 numbers are now available. RF Cafe typically
receives 8,000-15,000 website visitors each weekday and about half that
on weekends. RF Cafe is a favorite of engineers, technicians, hobbyists, and
students all over the world. With more than 8,000 pages in the Google search index,
RF Cafe returns in favorable positions on many types of key searches, both
for text and images. New content is added on a daily basis. Items added on the homepage
are broadcast on LinkedIn ...
subscription renewal for Radio-Electronics magazine was tucked inside
one of the group of 1969 issues I bought on eBay. It's not a big deal, but is always
interesting to see how the companies communicated with customers in the day. Note
that the mailing address for Radio-Electronics is simply Boulder, Colorado, with
no street address given - all the mailmen must have known where they were. The
cost was $12 per year ...
Sure, its really an infomercial, but the "Inside Story" piece in the May NASA Tech
Briefs, written by Pico Technology's Mark Ashcroft, provides a good insight
into what drives the cost of modern oscilloscopes. Per Mr. Ashcroft, "Back
in 1928 Messers Nyquist, Shannon, Kotelnikov and Whittaker all concluded that to
sample any continuous analogue waveform into discrete sampled (digital) form we
must have at least two samples within a cycle of the highest frequency that we wish
to represent. In practice we have to go further than that if want to reveal waveshape
detail or make meaningful repeatable measurements ..."
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 ..."
QuinStar Technology designs and manufactures
mm-wave products for communication, scientific, and test applications
along with providing microelectronic assembly, rapid prototyping, and mass customization.
Amplifiers, Oscillators, Switches, Attenuators, Circulators, Isolators, Filters,
Waveguide, Antennas, Phase Shifters, Transceivers, Mixers, Detectors. QuinStar specializes
in cryogenic amplifiers, circulators, and isolators. Please
visit QuinStar today to see how they can help your project ...
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 ...
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