KR Electronics part number
3012-220 is a
220 MHz bandpass filter designed for Positive Train Control (PTC) applications. Encapsulated
for enhanced shock and vibration resistance, 50 Ω source and load, N(F) to N(M) connectors.
The filters are encapsulated/ruggedized for enhanced shock and vibration resistance. Thousands
are currently installed and operating successfully in the field with major rail companies.
Other frequencies and bandwidths are available ...
Part 1 of this 3-part series discussed the basics of
radiation, and now author Ello delves into various methods of detecting and measuring radiation
Ionizing radiation measurement capability is needed for the safety of life forms due its
ability to knock electrons away from their host atoms, thus generating ions that cause molecules
to form that might not otherwise do so. If those molecules happen to part of a self-reproducing
living cell, then a mutant - or cancerous - cell is the result. With luck, body defense cells
will hunt down and kill it, but if not, a tumor will develop - maybe benign, but maybe malignant ...
W-Test cable assemblies are complete line of high precision flexible microwave cable assemblies,
specially for stable phase testing. These WT series are designed by excellent microwave interconnection
technologies. The WT500 & 670 cable assemblies, operating to 50 GHz and 67 GHz,
respectively, have excellent insertion loss, high phase/amplitude stability in relation to
According to Microwave Journal Editor Patrick
Hindle, "Antenna measurements are difficult to make due to their multi-directional nature,
their cables / connections to equipment and interfering signals in the environment. The measurement
setup, surrounding environment and physical connections all need to be carefully specified
and setup, paying close attention to the instruments and materials used." Copper Mountain
Technologies collaborated with Microwave Journal to offer you this free eBook,
Precision Antenna Measurements, on precision antenna measurements ...
During my tenure in the early-to-mid 1980s as an electronics
technician at Westinghouse Electric's Oceanic Division, in Annapolis, MD, I assembled many
a Mil-Spec printed circuit board. An initial week-long soldering class and then periodic refreshers
were required to get NASA-certified for the type of critical work we did there. I have
written before about the rigid inspection process that each PCB, cable harness, wire-wrap
board, etc., was put through. Many of the assemblies for use in underwater vehicles and ship-based
controllers needed to be
conformably coated for protection against the corrosive salt water environment. The first
"Officials in Xilinshui, in the city of Baoding, Hebei
province, created the scannable [QR] code, which measures 227 m along each side, using about 130,000
Chinese juniper trees, Xinhua reported on Thursday. The evergreen trees, which are native
to northeast Asia, are all between 80 cm and 2.5 m in height. While difficult to
do, anyone who scans the greenery using a smartphone or tablet will be connected to the village's
public WeChat account for tourism ..."
"Revolutionary, tower-style computer chips could boost
microprocessor performance a thousand-fold. In the age of big data, cloud and the internet
of things, our thirst for computing power has never been greater. Many of our readers will
be familiar with
Moore's law, the observation that predicts a doubling of computing capability
every two years, as integrated circuits are packed ever denser with ..."
"As demand grows for more versatile, advanced robotics
and other technologies, the need for components that can enable these applications also increases.
Producing such components en masse has been a major challenge. But now, in ACS Applied Materials &
Interfaces, researchers report that they have developed a way to help meet this need by printing
electronics that can fold themselves into a desired shape. Creating small
electronic pieces with specific architectural designs can now ..."
"There, his new specimens joined his collection and
waited patiently as only rocks can until he could find
time to analyze them." -
Kat McGowan, "Where Did It Begin?" September / October 2017 Popular Science
RF/Microwave Training Webinar
Title: Mixers and Frequency Conversion | Date: September 28, 2017 |Time: 8am
PT / 11am ET | Sponsored by: National Instruments
Presented by: Allen Podell
Outline: Frequency conversion is a critical function in all wireless systems. A key component
used to accomplish this is the mixer. Designers need to understand different mixer topologies
and specifications in order to meet their system requirements. This webinar provides a brief
overview of frequency conversion ...
Pay Scale has published their 2017-2018 list of college
rankings, along with average starting salaries. For
engineering pay levels, MIT tops the list at $84.7k, followed by Marietta
College and Stanford. The U.S. Naval Academy ranks #6 at $79.9k (and free tuition). Harvard
comes it at #8, and Mr. Einstein's' home of Princeton is #16. West Point, another institution
with free tuition, is at #18. The score of my alma mater,
UVM, is too embarrassing to mention,
but it does go a long way toward explaining my rather lackluster financial status. See the
entire list here ...
"In a pioneering effort to control, measure and understand
magnetism at the atomic level, researchers working at the National Institute of Standards
and Technology (NIST) have discovered a new method for manipulating the nanoscale properties
of magnetic materials.
The ability to control these properties has potential applications in creating and improving
the magnetic memory in consumer electronic devices, and developing a sensitive detector for
magnetic nanoparticles. The discovery ..."
RF Cafe visitor Richard P. posted this challenge
on my Facebook page. He would like a positive Id on the device in order to re-bias it for
higher voltage operation. It is in a HF amplifier he bought on eBay. The package marking is
smudged so that the full part number is indiscernible. I labeled the image with the limited
info I could make out. The company logo is Freescale, which was once Motorola and is now NXP,
so it is not a new device. The ceramic flanged package appears to be for an LDMOS transistor.
I spent more than an hour searching, but had, in Richard's words, "no joy." If you can ID
it, please send me an e-mail ...
"American Tower and Phillips Lighting partner on connected
light poles to add network density for smart city applications Siting of
wireless infrastructure in urban spaces is often a tricky proposition
for wireless carriers and neutral host providers. Regulations vary between jurisdictions,
which makes developing a scalable deployment model difficult and, in turn, drives up costs
and extends project timelines. In the context of a smart city, ultra-dense network ..."
The LDMOUNT is ideal for pump and communication diode
lasers. The LDMOUNT from Wavelength Electronics is designed for optoelectronic modules
in a 14-pin butterfly package that require up to 5A. With integrated heatsinking, built-in
safety features, and easy connection to eight different high performance Wavelength controllers,
the LDMOUNT can be used in a variety of applications, mounted on an optics table or to a chassis ...
ConductRF's skill in the manufacturing of
Phase Matched RF Cable
Solutions is second to none. We have phase matched a diverse array of solutions from Low
Frequency RG and LMR Cables to more premium exotic cables up to 70 GHz. Flexible, conformable &
semi-rigid, phase & amplitude stable, low loss & high power, phase differential as
low as ±0.2 °/GHz, many connector types, indoor & outdoor solutions. A broad base
of standard connectors and cables in stock, we turn solutions around fast ...
Each month (unless I forget) I post a list of articles
with advice on
career enhancement including tips on preparing resumes, conducting yourself properly at
interviews, getting along well with co-workers, handling a difficult boss, etc. I also
post links to polls and studies done on career satisfaction, pay rates, education and experience
levels, years in the field, etc. Those types of articles have been around since Johannes Gutenberg
invented the movable type printing press. In the 1970s, Popular Electronics ran a
series of articles titled "Opportunity Awareness" that offered such advice, much of which
in principle is still valid today. One of the biggest advantages you can give yourself ...
Semiconductor Industry Records Best 2nd Quarter in 3 Years
New 10-GHz Earth-Moon-Earth World Record Set
Consolidation Nearly Over, Analyst Says
How Many Ways Might iPhone X's Face ID Go Wrong?
Amateur Radio Emergency Net Active in Wake of Mexico Earthquake
Apple Watch Has Connectivity Issues
Google Acquisition Rumors Heat up As HTC Halts Stock Trades
LTE-Enabled Smart Watches to Drive Wearables Growth
Enrollments, Budgets Fall at 'Social Justice Warfare' Universities
"Chang Gung University and Episil-Precision in Taiwan
claim the first demonstration of in-situ silicon nitride (SiNx) gate dielectric aluminium
gallium nitride (AlGaN) barrier metal–insulator–semiconductor high-electron-mobility transistors
(MISHEMTs) on 6-inch silicon on insulator (SOI) substrates. The devices showed improved DC,
dynamic and radio frequency (RF) performance over the same structures grown on HR Si ..."
Glenn Robb, owner / engineer from Antenna Test Lab
Company sent me this very excellent whitepaper he just wrote titled "Circularly Polarized Antennas Explained, Without the Math." As promised,
his tutorial introduces the concept of circular polarization in electromagnetic waves and
then describes how he measures and reports results in a spreadsheet using automated antenna
positioning and frequency sweeping. Antenna Test Lab Co's evaluation service includes fully
circular polarization antenna evaluations at no extra charge. Practical antenna evaluations
with 2D or 3D patterns in hundreds of test directions (and frequencies) are available for
Maybe I'm just easily impressed by effective simplicity,
but I really like the Bluetooth homepage animation demonstrating the ubiquitous connectivity
theme of "mesh is here." Interconnecting
lines in the mesh moving in relation to all the nodal points is a great way to illustrate
the flexibility of the system. The one scenario the Bluetooth SIG doesn't show is how "mesh"
enables tracking of your movement, which can easily be correlated with cellphone activity,
credit card usage, etc. Surely the collective data would never be abused. If you're not doing
anything wrong, then there's nothing to worry about -- right? ...
"Under development by an MBDA-led consortium which
includes Qinetiq, Leonardo-Finmeccanica, Arke, BAE Systems, Marshall and GKN the so-called
system will be a 50 kW class directed energy weapon designed for use on both land and
sea. Laser weapons have key advantages over traditional systems: the munition is potentially
unlimited, and it operates at the speed of light so the time from when you say "fire" to the
weapon hitting its target is more or less instantaneous. According ..."
"Building on a half century of unprecedented chip scaling
and technology innovation, DOD is going back to basics in an attempt to reseed a U.S. electronics
sector that has contributed mightily to the nation's economic and national security. The
Advanced Research Projects Agency put more skin in the game with a batch of program announcements
worth $75 million over the next year as part of its Electronics Resurgence Initiative (ERI)
launched in June ..."
Popular Electronics ran a monthly news roundup
feature titled, simply, "Communications."
Included were tidbits on CB, SWL, HAM, RTTY, FAX, TV, SSB, AM, FM, CW, and ISB. I know that
because those are the acronyms in the string along the perimeter of the page's title. This
particular column was chosen because of the weird-looking Elser-Mathes Cup that will commemorate
the 1st amateur radio 2-way communications between Earth and Mars." I thought it was an artifact
of some primitive tribe's religious rite, but in fact those are Martians in the carving, not
Earthly savages ...
"The Amateur Radio Club at Yale University (W1YU) was
the host for the 2nd annual
Collegiate Amateur Radio Initiative (CARI) forum at the ARRL New England
Division Convention, September 8–10, in Boxboro, Massachusetts. ARRL CEO Tom Gallagher, NY2RF,
who — in light of the increasing number of reactivated and newly formed radio clubs at colleges
and universities — has been a prime mover behind the League initiative, opened the session.
Four presentations by participating institutions followed. Sean Barnes, N3JQ, of Harrisburg ..."