Today in Science History
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Declaring any kind of straight LC tank circuit to be high stability
is a bit of a stretch when compared to the Q available simply by adding a crystal, even in 1958. Tone modulation
was an early method for achieving remote control of model airplanes, boats, and cars. The number of
channels with these
systems is two times the number of modern proportional systems in that moving the rudder left took one
channel and moving it right took another. Up and down elevator likewise took two channels. Therefore,
this four channel system is only two channels by today's terminology. Technology evolved into fully
Saelig Company has introduced the
Siglent SDS1202X-E 200MHz Digital Oscilloscope with improved Super Phosphor Technology
at a remarkably affordable price. With a real-time sampling rate of 1 GSa/s, this new 200 MHz
scope features waveform capture rates of up to 100,000 wfms/s in normal mode and 400,000 wfms/s
in sequence mode. The SDS1202X-E has a waveform record memory of up to 14 Mpoints, and a 256-level
color and intensity grading and color temperature display. Together, these technologies have been collectively
dubbed by the manufacturer ...
Stories of interviewees being asked to solve engineering problems
- basically working for free - have been around for a long time. Dilbert comic strips have been drawn
forums have posts by people telling of ridiculous and/or insulting treatment. Fortunately, at least
in the engineering world, those instances are relatively few and far between. This first article this
month address the issue. The others cover both employers and employees - and prospective employees.
I try to weed out the ones written by people who do nothing but give regurgitated advice to others without
Anatech Electronics, a manufacturer of RF and microwave filters, has published its
April newsletter. As always, it includes both company news and some tidbits about relevant industry
happenings. In it, Sam Benzacar discusses, among other topics, the court battle battle between AT&T
and Rivada Mercury Networks regarding the National Public Safety Broadband Network administered by FirstNet,
build-out of IoT services, and Google fiber. Anatech's business is to make certain that system and circuit
designers have capable filters available to assure successful ...
"For decades, military aircraft have relied on
electronic warfare (EW) solutions to protect assets and dominate airspace. The ability
of the United States to detect and track aircraft, or avoid detection has played a major role in its
ability to project power globally and maintain freedom of operation in the air. Today, that dominance
is being challenged given the rapid advancements in, and widespread availability of, technology for
adversaries. In order to make the best use of finite resources, EW ..."
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Empire of the Air: The Men Who Made Radio is a quite interesting
documentary about the struggle that Edwin H. Armstrong - inventor of the superregenerative and
superheterodyne circuits, and of wideband frequency modulation (FM) - had with Lee DeForest - inventor
of the Audio amplifying tube - and David Sarnoff - CEO of Radio Corporation of America (RCA). Extensive
legal battles ensued between Armstrong and DeForest over vacuum tube patents, and Sarnoff's transition
from biggest cheerleader to biggest thwarter of Armstrong's efforts are epic. A huge amount of historical
information and vintage film clips
BBTLine LLC (Broadband Transmission Line)
has introduced a unique patented design which allows for more compact devices while maintaining low
insertion loss (higher RF power handling... > 20 watts as a splitter),
excellent return loss and excellent amplitude and phase balance. Although there are endless
RF power splitters / combiners to choose from
on the market, once you start narrowing the search criteria down to 1) Broadband, 2) Surface Mount,
and 3) Higher RF Power Rating characteristics, the number of choices is reduced considerably. BBTLine's
line of surface-mount ...
"Use it up... Wear it out... Make it do... Or do without" - what
a great slogan! It was coined by the War Advertising Council during World War II to promote the
dual need to conserve scarce resources and to help keep prices down by not generating excess demand.
Most of us have seen videos or read articles about neighborhood materials collection efforts to round
up old tires, scrap metal, glass, tools, electronics equipment, cloth and clothing, and many other items
that could be ...
Copper Mountain Technologies has published a whitepaper titled,
"What Makes a Good VNA?" CMT manufactures Vector Network Analyzers with a USB interface.
"Everyone knows that a good VNA should have both excellent hardware performance and an easy to use software
interface with useful post-processing capabilities. But there are numerous VNAs in the market with different
performance levels; some of them are economy grade, and others are truly laboratory test grade. So what ..."
Tektronix has published a whitepaper titled "Radar Signal Generation with a High-Performance AWG" that is available as a free
download. "Generating radar signals is one of the most challenging tasks for a signal generator. The
signals' combination of carrier frequency, modulation bandwidth, and, in most cases, their pulsed nature
creates a series of requirements difficult to match with existing instrumentation. The increasing complexity
of radar systems, the growing use of complex modulation techniques such as OFDM or UWB, and the signal
"Laser weapons have been one of the most important topics of
discussion in the Pentagon at least for the past five years, and several weapons programs involving
lasers are in advanced development. There's the U.S. Navy's shipboard Laser Weapon System (LaWS)
which was deployed for operational tests aboard the amphibious transport dock USS Ponce. Then there's
the Boeing truck-mounted High Energy Laser Mobile Demonstrator (HEL MD) for use against air and ground
targets. One of the most important potential future ..."
This 1956-vintage article by techno-kidder Carl Kohler taught
me a new word - 'darb,' as in "Isn't that a darb, now." According to Merriam-Webster, a darb is a slang
term for something superlative. Mr. Kohler penned many tongue-in-cheek stories for Popular Electronics
in the 1950s and 1960s, all of them based on his antics involving the latest electronics gadget and
Mrs. Kohler's reaction to them. Maybe they are real (in this case, 'reel') and maybe not, but regardless,
they are funny and even if made up, could easily be actual experiences. A list of other Kohler ...
"Quantum interference involving three photons has been measured
by two independent teams of physicists. Seeing the effect requires the ability to deliver three indistinguishable
photons to the same place at the same time and also to ensure that much more common single-photon and
two-photon interference effects are eliminated from the measurements. As well as providing deep insights
into the fundamentals of quantum mechanics,
3-photon interference could also be used in quantum cryptography ..."
puzzle, as is the case every week, contains only words pertaining to science, engineering, amateur
radio, physics, mechanics, mathematics, etc. Making a special appearance is the name of the most recent
company to support RF Cafe through advertising. You will see their banner graphical ad appearing in
the right page border sometime this week. Enjoy ...
Here for radio hobbyists are a dozen handy-dandy 'kinks,' otherwise
known as tricks, shortcuts, or clever ideas, that could prove useful while working in the lab at work
or in your shop at home. One kink that might be worth trying calls for immersing an aluminum panel in
a water-lye solution to achieve "a professional-looking finish." A satin look results. A Google search
on etching aluminum turns up many other methods. Admittedly, most of these ideas would not ...
"A novel technology that embeds highly conductive nanostructure
nanofiber has now been developed by researchers. The novel composite so produced has superb charge
conductivity, and can therefore be widely applied, especially in environmental arena. A research team
led by Prof. Wallace Leung develops novel semiconductor nanotubes with superb charge conductivity which
can be widely used in different applications, especially in environmental arena ..."
sounded the alarm Tuesday over the problems posed to space missions from
orbital junk - the accumulating debris from mankind's six-decade exploration of
the cosmos. In less than a quarter of a century, the number of orbiting fragments large enough to destroy
a spacecraft has more than doubled, a conference in Germany heard. And the estimated tally of tiny objects
- which can harm or degrade spacecraft in the event of a collision, and are hard to track - is now around
150 million. - We are very ..."
Broadband, Wi-Fi More Important Than Laundry for Apartment Dwellers
ARRL 2017 Hamvention Forum Topics Encompass Makers, Youth, HamSCI
Rechargeable Batteries from Recycled Glass Store 4x More Energy
Google AI Engineers Defect, Start Own Company
Computer Pioneer Harry Huskey
Dies Aged 101
'New Golden Age' of (Digital) Radio Heralds Possible End of FM
10 Superconducting Qubits Entangled
by Physicists in China
GaN Systems' Investors Receive Venture Capital Awards
Verizon Loses Key Wireless Customers for 1st Time
GaAs amplifier operates at a frequency range of 5700 MHz to 5900 MHz and has a power output of 25 Watts,
while still maintaining a compact form factor of 5.3 x 3.25 x 0.57 inches. This unit also features internal
protection against over/under voltage and excessive temperature conditions, which coupled with its rugged
construction, ensure fault-free operation in even the most extreme environments. This class A GaAs module
is designed for both military and commercial applications. It is capable of supporting any ...
Significant advances in electronics - and all other kinds of
technology for that matter - occurred during World War II, which in conjunction with the U.S. government
selling surplus equipment at the end of that war at very low prices, cause a boom in consumer electronics
markets. The established radio business and the fledgling television markets were abetted by quickly
expanding numbers of
This chart from early 1948 show the number of currently licensed AM, FM, and TV stations, with projections
out 20 years to 1968. I don't have ..."
"NASA Langley Research Center has developed a wireless, connection-free,
open-circuit technology that can be used for developing electrical devices such as sensors that need
no physical contact with the properties being measured. At the core of the technology
is the SansEC (Sans Electrical Connections) circuit, which is damage-resilient and environmentally friendly
to manufacture and use. The technology uses a NASA award-winning magnetic field response ...
"Pulsed signals are widespread in radar and other electronic
warfare (EW) applications, and they must be accurately measured for manufacturing, design of countermeasures,
and threat assessment. Pulse measurements are an especially challenging area for signal analysis due
to a combination of factors. Fortunately, many of the improving signal processing and analog-digital
conversion technologies behind the generation of complex pulse environments also enable new techniques
pulse analysis. A real-time spectrum measurement of a multi-emitter ..."
As EW warfighting requirements continue to evolve in their complexity
and interdependency, it is clear that future EW systems must work collaboratively with other air, ground,
surface space and cyberspace systems. The need for multi-purpose, multimode, flexible software defined
EW systems is being clearly and widely communicated by the DOD EW community.
RF has developed the world's first software definable high power RF amplifiers, an essential element
for adaptable multi-mode EW systems. Come visit us to learn more at the Point Mugu Electronic Warfare ...
"Infineon Technologies has joined the
5G Automotive Association (5GAA), to contribute towards the creation of a 5G standard
for cars. The association is working on the introduction of new communication solutions enabling connected
automated driving and on intelligent transport systems. Infineon will provide key 5G technologies required
for the autonomous car, and for electromobility. Secure communication with practically zero time delay
is a critical requirement ..."
"NASA Langley Research Center has developed a novel
negative dielectric constant
material based on ion conducting materials. A negative dielectric constant material is an essential
key for creating metamaterials, or artificial negative index materials (NIMs). NIMs have generated great
attention due to their unique and exotic electromagnetic properties, and could be used for unique optical
and microwave applications, including new methods of electromagnetic cloaking and extremely low loss
Triacs are not a component often used in RF and microwave circuit
design, but being conversant in its operation could make you popular at nerd parties. A triac is basically
the equivalent of two SCRs connected back-to-back, allowing it to conduct on both the positive and negative
half-cycles of an AC connection. Both devices are most commonly used in switching applications. The
unique feature of an SCR and triac is that once the gate voltage is sufficiently high to begin conduction
between the anode and cathode, it can be removed and conduction will continue until the anode-cathode
voltage is removed ...