Today in Science History -
a leading technology company that helps enterprises, service providers and
governments accelerate innovation to connect and secure the world, has launched
Innovate Anywhere program in response to COVID-19, spanning three key areas:
90-day software trials, remote learning, and scalable live network testing. "At
Keysight, we are committed to helping customers maintain their engineering
productivity no matter where they are working," stated Marie Hattar, CMO at
Keysight. "We recognize COVID-19 is causing drastic changes across the globe, in
our communities, our homes, and our workplaces. We want to help provide a sense
of normalcy and enable customers to do what they do best: to innovate, from
"Honeywell says that it will release the
world's most powerful
commercial quantum computer by mid-2020. The U.S.-based manufacturer of scientific
and commercial equipment says that the device is based on trapped ions, which is
a different technology than that being pursued by most other commercial developers
including Google and IBM. Honeywell researchers have published details of a smaller
version of the machine that has a 'quantum volume' of 16 and say that it should
be straightforward to scale this up to 64. The fundamental requirement for quantum
computation is a set of quantum bits (qubits) that can interact to form quantum
logic gates that process quantum information. In principle, quantum computers can
perform certain computational task much faster than conventional computers. However,
qubits tend to be very fragile so creating..."
Z-Communications' new CRO6750X2-LF utilizes
a doubled CRO oscillator design to cover the frequency range of
6750-6750 MHz within a tuning window of 0.5-4.5 Vdc. This new ceramic resonator
VCO features phase noise of -101 dBc/Hz @ 10 kHz offset and is available in Z-COMM's
standard MINI-16-SM package measuring 0.5 in. x 0.5 in. x 0.22 in. The CRO6750X2-LF
is well suited for radar systems requiring optimal spectral purity. This unmatched
VCO is configured to deliver output power of 0±3 dBm into a 50 ohms load and covers
the operating frequency with a low Kvco figure of 5 MHz/V all while operating over
the industrial temperature range of -40 to 85°C. It is specified to run off a 5.0
Vdc supply while drawing only 30 mA of current. The CRO6750X2-LF suppresses both
the ½ and 2nd harmonic to better than -20dBc while limiting pulling...
Raise your hand if you have ever owned a
CB (Citizens Band) radio. Waaaaay back before everyone carried a cellphone (pre-late-1990s),
the most common form of
unlicensed communication was CB radio. Actually, up through the mid 1970s you
were supposed to purchase a license from the FCC, although no test was required
as it was for amateur radio. My first CB was a 23 channel job that I installed in
my 1969 Chevy Camaro SS, during my senior year in Southern Senior High School.
It was right in the middle of big CB radio craze with CW McCall's "Convoy" song
topping the U.S. Billboard charts. My self-appointed 'handle' was "RC Flyer." Most
people had no idea what it referred to (radio-controlled model airplanes). Now that
all cellphones use internal antennas, almost nobody even thinks of them as being
radios. CB radios reminded you of their true nature by requiring that a 1/4-wave
vertical antenna (typically with a loading coil to keep it shorter than its 27 MHz
Nova Microwave is a leader in technically differentiated
electronic and radio frequency Ferrite Circulators and Isolators that connect, protect and control
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designed for use in varied environmental and temperature extremes.
Admittedly, with all the reading I have done
of vintage electronics magazines, news of this
Crystron (crystal-electron) vacuum tube device invented by Mr. Mohammed
Ulysses Fips, as reported in the April 1947 issue of Radio Craft magazine,
evaded my attention. The article came only a couple months after publication of
the 40th anniversary edition that celebrated Dr. Lee de Forest's invention
of the Audion tube. According to Mr. Fips, his Crystron one-upped the Audion
by virtue of its containing a small amount of radio isotope which obviated the need
for the traditional "B-battery" concept also developed by de Forest to supply
a high voltage for driving the output stage circuit. While not capable of powering
a concert hall audio speaker system, it did make possible use of a small speaker
as a nearby personal listening device rather than requiring headphones or earbuds.
Without divulging the most critical and closely-held details of the Crystron as
the U.S. Patent Office...
Artech House today announced the publication
High-Power Electromagnetic Effects on Electronic Systems, by D.V. Giri, Richard
Hoad and Frank Sabath. This is the first book that comprehensively addresses the
issues relating to the effects of radio frequency (RF) signals and the environment
of electrical and electronic systems. It covers testing methods as well as methods
to analyze radio frequency. The generation of high-powered electromagnetic (HPEM)
environments, including moderate band damped sinusoidal radiators and hyperband
radiating systems is explored. HPEM effects on component, circuit, sub-system electronics,
as well as system level drawing are discussed. The effects of HPEM on experimental
techniques and the standards which can be used to control tests are described. The
validity of analytical techniques and computational modeling in a HPEM effects context
is also discussed. Insight on HPEM effects experimental techniques...
MPDevice (MPD) has become a trustworthy
and reliable company in the global RF market as a manufacturer of
passive RF Devices. Included
are attenuators and terminations, coaxial connectors, adapters, and cable assemblies,
DC blocks, surge arrestors, power combiner / dividers, and directional couplers.
The Korean Telecommunication market is now entering into the era of hyperconnected
society. With continuous enhancement in R&D capabilities and quality control,
MPD will continue in an effort to become the No. 1 technologically innovative
company with a focus on the emerging 5G marketplace.
Pulse compression (aka 'chirp')
radar was invented in the 1950s by Sperry and a couple other defense contractors.
It was new enough by the time the radar I worked on as a technician in the USAF
that it was not incorporated. Our MPN-13 and MPN-14 radar systems used simple single-frequency
pulses. Pulse compression employs a swept frequency within a fairly narrow bandwidth
to exploit the benefits outlined in this 1965 Electronics World article. If you
were to listen to the signal used to sweep the RF pulse in frequency, it would sound
a lot like a bird's chirp, hence the name. Treatment by author Donald Lancaster
is fairly heavy in that it fearlessly presents the mathematical concepts of sin(x)/x
waveforms, Fourier transforms, and weighting. He references Skolnik, Ridenour, et
al. Even so, it is a quick read that provides a good introduction to chirp radar...
Electro-Photonics LLC, a market leader in RF and Microwave components has released
a new series of
band pass filters featuring frequencies from 300 MHz – 50 GHz. Our
new wide bandwidth filters future high stop band suppression and compact size. These
RF/Microwave and mmWave filters can dissipate up to 20 W of continues wave
power. Electro-Photonics, LLC, is a global supplier of high-frequency components
and services. Our products include, SMT hybrid and directional couplers, high frequency
test fixtures, evaluation test boards, and wire bondable passive components.
PCB Directory is the largest directory of
Printed Circuit Board (PCB) Manufacturers,
Assembly houses, and Design Services on the Internet. We have listed the leading
printed circuit board manufacturers around the world and made them searchable by
their capabilities - Number of laminates used, Board thicknesses supported, Number
of layers supported, Types of substrates (FR-4, Rogers, flexible, rigid), Geographical
location (U.S., China), kinds of services (manufacturing, fabrication, assembly,
prototype), and more. Fast turn-around on quotations for PCB fabrication and assembly.
Two major radio events were covered in this
1954 issue of Radio & TV News magazine's monthly "Spot Radio News"
column - the rapid advance of microwave technology for building out
high capacity voice and television transmission systems, and the ever-increasing
number of new TV station operation license grants since the ending of the Federal
Communications Commission (FCC) moratorium in 1952. In 1944, the FCC stopped issuing
broadcast permits due to serious unforeseen interference from co-location interference
issues as post-war households enthusiastically adopted TV. Unlike today's microwave
relay networks, in the 1950s most systems were still analog in nature. Coaxial cable
installations were good, but use over extra long distances and in difficult to access
areas limited their applicability. Line-of-sight limitations between relay towers
required building more sites than might otherwise be required, but the advantage...
Here from a 1965 issue of Electronics
World magazine is a really nice write-up on
electrical noise, both how it originates and how it affects receiver systems.
Although vacuum tubes were still the predominant active amplification components
in 1965 (the date of this article), semiconductors were already solidly ensconced
in the signal detector role. I have to confess to learning a new term that I probably
should be familiar with: Equivalent-Noise-Sideband-Input, or ENSI. It appears also
in Reference Data for Engineers: Radio, Electronics, Computer, and Communications.
Interestingly, this is the first time in a long time I have seen noise referred
to as "grass;" the drawings make it clear why the moniker was created. We were taught
to use "grass" in USAF radar tech school and used it in common parlance...
RF Cafe typically receives 8,000-15,000
website visits 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 13,000 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, which keeps the major search engines interested enough to spider
it multiple times each day. Items added on the homepage often can be found in a
Google search within a few hours of being posted. I also re-broadcast homepage items
on LinkedIn. If you need your company news to be seen, RF Cafe is the place
to be. Advertising begins at $40/month.
The first video below is my favorite. It
is a one-minute clip from a 1960s episode of "The Twilight Zone"
television show. It is an outrageous slam on amateur radio operators by a family
whose radio and TV shows are being interrupted by interference. Dad looks out the
window and sees what are actually television antennas on the guy's roof and when
Mom asks if there is anything they can do about the neighbor, he walks toward the
telephone saying he can at least check to find out whether neighbor man has a license
to operate. Mom then says, "Do you think you should, Stu? Those men seem kind of...threatening
somehow." Those d**n evil Hams! As you might expect if your are familiar with the
series, it turned out to be aliens making contact with Earthlings...
"Sensing from the inside A mock-up of an
ingestible pill containing the wireless transceiver. Researchers at Imec, a
Leuven, Belgium-based center for nanoelectronics and digital technologies, have
developed a wireless receiver and transmitter small enough to fit inside a millimeter-scale
capsule. The transceiver, which was presented at the International Solid-State Circuits
conference in San Francisco, U.S., last month, is 1/30th the size of today's state-of-the-art
systems and could be used in a broad range of so-called 'ingestibles' - sensors
that monitor health conditions from inside the human body. Like their external,
wearable cousins, ingestible sensors..."
Empower RF Systems
is a global leader in power amplifier solutions. Empower RF Systems is an established
and technologically superior supplier of high power solid state RF & microwave
amplifiers. Our offerings include modules, intelligent rack-mount amplifiers, and
multi-function RF Power Amplifier solutions to 6 GHz in broadband and band
specific designs. Output power combinations range from tens of watts to multi-kilowatts.
Unprecedented size, weight and power reduction of our amplifiers is superior to
anything in the market at similar frequencies and power levels.
This March 29, 2020,
tech-themed crossword puzzle contains only clues and terms associated with engineering,
science, physical, astronomy, mathematics, chemistry, etc., which I have personally
built over nearly two decades. Many new words and company names have been added
that had not even been created when I started in the year 2002. You will never find
a word taxing your knowledge of a numbnut soap opera star or the name of some obscure
village in the Andes mountains. You might, however, encounter the name of a movie
star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons
which, if you don't already know, might surprise you...