Today in Science History
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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 ...
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 ...
"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 ..."
"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 ..."
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 ..
"The 'Porcupine' is out, and it's making its debut in all its
shiny grandeur. Nicknamed 'Porcupine' within AT&T, a new millimeter-wave channel sounder was introduced
this week as a first-of-its-kind device. Looking a bit like something that might be walking and talking
in a Star Wars movie, the sounder was developed with the help of National Instruments (NI) to capture
how wireless signals are affected in a given environment. It can be used to measure how signals reflect
off of, or are blocked by, objects like trees ..."
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 ..."
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 ..."
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 ...
"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
"For the first time, researchers have been able to deposit an
ultra-thin oxide ferroelectric film onto a flexible polymer substrate. The research team used the flexible
ferroelectric thin films to make non-volatile memory devices that are wearable and resilient. 'Ferroelectric
materials are capable of storing charge, which makes them ideal for non-volatile memory devices,' says
Jacob Jones, a professor of materials science and engineering at North Carolina State University and
co-author of a paper on the work ..."
"Keysight experts will be at
WAMICON 2017 (April 24–25), an annual IEEE Wireless and Microwave Conference, to
discuss everything from circuit-level modeling to system verification for general RF, microwave, millimeter
wave for 4G, emerging 5G communications, and aerospace & defense. Keysight also will be demonstrating
the latest ADS 2016, EMPro and SystemVue software, as well as a range of RF and microwave tools that
include the ENA network analyzer, MXG X-Series RF vector signal generator and MXA multi-touch signal
Italian Court Finds Link Between Cellphone Use and Tumor
Death by Overwork: Japan's 100-Hour Overtime Cap
FCC Proposes Levying Huge Fine on New York Police Radio Jammer
China Mobile Network Market to Shrink 34% in 2016-2021
Verizon Drops a $1B on Fibre with Corning
Children as Young as 13 Treated for Cellphone Addiction
Visa Applications Drop
The Motor City Tops Best Town List for CAD Designers
Nominations Open for 2017 Bill Pasternak Young Ham of the Year
"Radio waves, microwaves and even light itself are all made of
electric and magnetic fields. The classical theory of
was completed in the 1860s by James Clerk Maxwell. At the time, Maxwell's theory was revolutionary,
and provided a unified framework to understand electricity, magnetism and optics. Now, new research
led by LSU Department of Physics & Astronomy Assistant Professor Ivan Agullo, with colleagues from
the Universidad de Valencia, Spain, advances knowledge of this theory. Their recent discoveries have
been published ..."
"Sensor firm, VStar Systems, has completed a successful flight
test of its modular Signal Intelligence Sensor,
MA-C/lite, aboard the Martin UAV V-Bat aircraft. Over the duration of 35 minutes
at an altitude of 400 feet above ground level, the MA-C/lite sensor collected radio signals from as
far as 20 miles, according to VStar. VStar's goal for the MA-C/lite sensor was to build a light-weight
signal detector small enough to be carried on UAVs used by military and private security clients. 'Radio
detection systems are large. It's hard to find ..."
Woo-hoo, I have finally achieved Ham radio license Nirvana! Reporting
this on World Amateur Radio Day seems appropriate. On Saturday, April 15, 2017, I passed my
Extra exam in the presence of three VEs at the Wattsburg Wireless Association meeting room in Erie,
PA. Nearly 7 years have transpired since I took the Technician test in the same room in 2010. My General
license test was taken at the Forsyth Amateur Radio Club meeting room in Winston Salem, NC, in, 2015.
Until the FCC updates my record in the online Universal Licensing System (ULS), my call sign will be
KB3UON/AE. Motivation for pursuing the Ham radio license goal was two-fold ...
The March 1951 issue of Radio & Television News had
just two television-themed
comics. The first one might have been pushing on the edge of acceptability, but these types of magazines
were directed almost exclusively toward men. The easily-offended special snowflake generation was far
in the future. Television at that time was building a huge presence in homes worldwide, and there was
a huge amount of interest in the technology. It hadn't really been all that long since the public got
used to hearing sound (i.e., 'talkies') in the movie theater, so the mystique ...
"The International Amateur Radio Union Region 1 (IARU-R1) Monitoring
System (IARUMS) March newsletter reports that the
Russian 'buzzer' on 6,998.0 kHz has disappeared. For a long time the system interfered
with the lower edge of the 40-meter band. In addition, a Russian F1B transmission on 7,193 kHz - believed
to be emanating from Kaliningrad - has ceased. IARUMS credits German telecoms authorities for submitting
complaints and the Russian military. The IARUMS March newsletter further reports that a Chinese ..."
"Static, like the
poor, will always be with us." -
John Renshaw Carson,
inventor of single sideband (SSB) modulation. His mathematical analysis 'proved' that frequency modulation
(FM) offered no improvement in noise over amplitude modulation (AM). The well-known Carson Rule of FM,
BW = 2(Δf + fm), came out of that work. Major Edwin H. Armstrong,
a contemporary of Carson's, invented
FM, hence rendering the prediction void. The rest, as they say, is history Armstrong also invented
the regenerative and heterodyne circuits prior to his FM work.
"Pasternack, a leading provider of RF, microwave and millimeter
wave products, has released four new
1.0 mm flexible VNA test cables that are designed to deliver precision testing results
for Vector Network Analyzer (VNA) testing, semiconductor probe testing, automotive radar testing and
military radar testing. They are ideal for applications such as test benches, radar, microwave radio
and millimeter wave radio. Pasternack's four new high-performance, flexible VNA test cables operate
at up to 110 GHz and deliver precise results for testing ..."