women's roles and interest in STEM (science,
technology, engineering, mathematics) careers has been a
major effort by schools in the last couple decades in an attempt
to 'remove barriers,' both real and perceived, inhibiting entrance
into the fields. There are still many realms of STEM that women
have avoided, but computer programming and mathematics are examples
their representation having seen steady increases.
Dr. Frances Bauer can be seen in this 1955 Popular Science story
on Project Cyclone, which reports on her role programming what was
at the time one of the largest computers in the world. Her work
ran the gamut between civil engineering on bridge projects to predicting
missile flight paths for the military. You might recall the U.S.
Grace Hopper, who is credited with coining the term "bug"
AWR Exhibits at
COMCAS and IME 2013
Corporation, the innovation leader in high-frequency EDA software,
COMCAS 2013 and IME 2013 in Israel and China the week of October
21, 2013. At each show, the latest release of Microwave Office,
Visual System Simulator, Analyst, AXIEM, and Analog Office for the
design of MMICs, RF PCBs, RFICs, microwave modules, communication
systems, radar systems, antennas and more will be showcased. Specific
software demonstrations and lecture presentation include: MWO design
environment, design Analyst 3D FEM EM simulation featuring a preview
of V11, VSS featuring an enhanced radar library and novel radio
frequency planning wizard, RFP AWR Connected to National Instruments.
The Basics of
Digital Signal Spectra
is a short primer by Daniel Chow on the basics of
digital signal spectra (EDN website).
It begins with the Fourier transform of a single rectangular pulse
and progresses through the spectrum of a series of data pulses and
of non-rectangular pulses.
Electronic Treasures of the
and the name David Sarnoff seem to be showing up a lot lately, at
least in the venues I travel for technical reading. I don't see
particular dates mentioned that make this the anniversary of anything
related. Ironically, this mention of the two names together adds
to the phenomenon. The October 2013 edition of IEEE's Spectrum
magazine has a nice spread titled, "Electronic
Treasures of the David Sarnoff Collection." RCA, the Radio Corporation
of America, was founded in 1919 in Princeton, New Jersey
(home base of Mr. Einstein, amongst other
notables). David Sarnoff, chairman of RCA, was the son of
a Jewish immigrant. Although neither a scientist nor an inventor
himself, Sarnoff established a record of ambition and business savvy
from a young age - although he was an accomplished telegraph operator
(participated in the rescue efforts of the
Please visit KR Electronics
over 40 years KR Electronics (an RF Cafe supporter
since 2009) has designed and manufactured
filters for the commercial and military markets. KR Electronics
manufactures all filter types and individually synthesizes
filters for special applications. State of the art computer synthesis,
analysis and test methods are used to meet the most challenging
specifications. All the standard topologies are supplied along with
diplexers, linear phase, group delay equalizers, and many custom
Carl and Jerry: Ham Radio
is another exciting episode of the sleuthing adventures starring
Popular Electronics' tech savvy teenagers,
Carl and Jerry. The Hardy Boys of electronics are the creation
of author John T. Frye, who created short story adventures for many
years - long enough to at one point require a major modification
in their appearances to reflect more modern attire and eyewear.
This particular adventure begins with Carl considering whether his
ham radio hobby is more useful from its technical aspects or its
everything RF Intros New RF &
Products at EuMW
European Microwave Week is the largest Event for the RF &
Microwave Industry in Europe. This year it is being held in Nuremberg,
Germany from the 6th to the 11th of October. There are over 200
Companies that are taking part in the exhibition here. Today's newsletter
lists some new products that have been announced this week at the
Electronics for Tomorrow
devices based on the Peltier effect were first demonstrated
by French physicist
Jean Charles Athanase Peltier when he noted the presence of
heating or cooling at an electrified junction of two different conductors
types (opposite of a thermocouple).
Widespread commercial use depended on finding efficient materials
that could be produced inexpensively. Music synthesizers, to be
practical, needed to await the availability of miniaturized electronics
like transistors and memory elements. Light amplification similarly
depended on affordable sources to be anything more than a laboratory
curiosity. Fortunately, by the mid 1950s such entities were becoming
reality. This article reports on a few of those items.
Excel 2013 Bible
RF Cafe Featured Book
2013 Bible, by John Walkenbach. Engineers still rely pretty
heavily on spreadsheets for day-to-day work. The full-featured simulators
are invaluable for detailed simulations, but often are severe overkill
for a quick calculation. Known as "Mr. Spreadsheet," Walkenbach
shows you how to maximize the power of Excel 2013 while bringing
you up to speed on the latest features. This perennial bestseller
is fully updated to cover all the new features of Excel 2013, including
how to navigate the user interface, take advantage of various file
formats, master formulas, analyze data with PivotTables, and more.
inspection capability is a vital tool not just in medicine busigat
in industry. During my tenure with a major cellphone power amplifier
company as an RF Applications Engineer, I relied heavily on x-ray
imaging for many of the teardown reports that I wrote on competitors'
products. It included everything from determining metal layers in
integrated circuits to deducing multi-layer ceramic PCB routing
lines and distributed components to just getting a quick look inside
a shielded enclosure without needing to disassemble it. A skilled
x-ray technician can make a huge difference in the quality of information
that can be gleaned from the images since angle, power level, and
focusing takes a deft touch. My first experience with using x-rays
for inspection was while doing automated test system design for
production base station equipment companies. Very stringent PIM...
Notable Tech Quote
something cant be explained off the back of an envelope, its rubbish."
Richard Branson, Virgin CEO
Many Thanks to SigaTek
for Continued Support!
microwave specializes in high quality, high frequency
components up to 60 GHz. As a pioneer supplier of microwave
RF components, the main products include directional couplers, bias
tees networks, power dividers/combiners, 3 dB hybrids 90° and
180°, microwave mixers, frequency doublers, load terminations, and
coaxial connectors and adapters.
Science & Engineering
Sunday I create a
crossword puzzle using a word list that I personally created
and added to during over a decade of making puzzles. All of the
words are related to engineering, science, mathematics, chemistry,
astronomy, etc. There are no numbnut clues about movie stars or
How to Solder
soldering is almost as much of an art form as it is a technical
skill. Having been through numerous soldering classes in my career,
starting with electrical vocational courses in high school, then
again in USAF technical school, and other times while working as
a technician and engineer, I always exercise care in making solder
joints. Proper preparation - including both tinning of mating surfaces
and a means to prevent the joint members from moving during cool-down
- is of utmost importance for assuring a nice, smooth, shiny joint
with just the right amount of solder. Lead-free solders do not tend
to produce the level of shininess as do the good old 60-40 type
tin-lead solders, but you can still make a nice looking joint. This
might be more information than you want to know about me, but I
even strive for perfection in solder joints in copper pipes and
fittings used in plumbing work. Call me a masochist, eco-villain,
or worse, but...
Triad RF Systems and
DCH Systems Join Forces
May 1st, 2013, DCH Systems, EIN 20-4638136 and Triad RF Systems,
Inc., EIN 27-3907731, merged into one entity with the
Triad RF Systems,
Inc. name surviving. Triad RF Systems is fully owned by three
(3) partners: Dean Handrinos, Steve Barthelmes, and David Campbell.
Triad RF Systems, was formed with the objective to solve the problem
of high power amplifiers (HPAs) being the Achille's heel in most
RF radios. We have solutions for integrating high performance HPAs
into sophisticated RF subsystems and systems without sacrificing
efficiency and linearity. Triad RF Systems serves all areas of the
RF and Microwave industries including military, satellite and commercial
from Popular Electronics
are a lot of
audiophiles in the RF Cafe audience, so this 10-question quiz
about audio topics from Popular Electronics should prove useful.
It covers not just the physical aspects but also some simple electronics
concepts, like decibels of gain, crossover networks, push-pull amplifiers,
PMI Intros 1 to 40 GHz Ultra-
Model No. PEC-42-1G40G-20-12-292FF is a 1.0 to 40 GHz,
ultra-wideband low noise amplifier that provides 42 dB
of gain typically with a typical noise figure of 5.5 dB. The
OP1dB is typically +22 dBm (1.0 to 18.0 GHz)
and +19 dBm (18.0 to 40.0 GHz).
The maximum input power rating is +17 dBm CW and the operating
DC supply is 550 mA at +12 to +15 VDC. This unit
is supplied in a package measuring 1.37" x 1.0" x 0.6" with 2.92 mm
Many Thanks to Alliance Test
Test is a trusted source providing sales, rentals and leasing of
electronic test and measurement equipment to the R&D, manufacturing
and quality assurance industries. We carry a full range of used
test equipment from manufacturers such as Agilent, Ando, Anritsu,
Fluke, HP, Keithley, Lecroy, Rohde & Schwarz, and Tektronix.
Recover 30%-40% more on your idle test equipment rather than selling
to a dealer.
AWR & NXP Release UWB
Doherty Amp Reference
Corporation, the innovation leader in high-frequency electronic
design automation (EDA), announces
that NXP Semiconductor's ultra-wideband (UWB)
Doherty reference design is now AWR Microwave Office design environment
ready. The updated release features NXP’s BLF884P and BLF884PS
transistors for ultra-wideband Doherty power amplifiers operating
from 470 to 806 MHz and a 70 W DVB-T UWB LDMOS reference design
using NXP’s patent-pending architecture capable of operating over
an ultra-wideband spectrum in the UHF broadcast spectrum.
Sherlock Ohms: Case of the
Ohms is a regular feature of the Design News website where
readers submit anecdotes from their on-the-job experiences. There
has been a tendency lately in this column and, to a lesser degree,
in the similar Tales from the Cube column for situations
involving newer, less experienced engineers being frustrated by
the domineering attitudes of some senior engineers. In contrast,
I cannot recall an instance of a story where the senior engineer
dumps on stupid actions of a newbie. Maybe doing so is considered
bullying or akin to a guy hitting a girl. Regardless, all the stories
in both columns are good for instruction...
Interface Coiled Tubing
tubing load cells are used for measuring the insertion force of
small diameter (typically 0.5 to 4.5 inch)
stainless steel tubing that is inserted into the borehole / wellbore
at the wellhead. A borehole is any hole drilled for the purpose
of exploration or extraction of natural resources such as water,
gas or oil where a well is being produced. The coil tubing
(CT) is usually installed when the
well, which has been drilled, is deemed ‘viable’ and will produce
the natural resource in a productive and economic manner. Coil tubing
provides intervention allowance of vertical, horizontal, highly
deviated, and live wells(1). Adding...
How to Read and Understand
an Antenna Data
white paper has been published by Linx Technologies titled, "How
to Understand an Antenna Data Sheet." Author, Shawn Hogan, VP
of Engineering, writes, "The information on an antenna data sheet
is nothing short of overwhelming. It can be difficult to maneuver
through to select the best antenna for your design. There are several
factors to take into account when looking at an antenna data sheet
including: monopole vs. dipole antennas, the electrical parameters,
counterpoise, gain and radiation pattern. Our goal is to break down
these features so you can use that knowledge to discover advantages
and disadvantages of different antennas as they relate to your specific
RCA Cunningham Radiotron Ad
you seen the new national advertising campaign where Freescale
(formerly Motorola) is using big name
celebrities to sell their cellular base station power transistors?
Scarlett Johansson and Ashton Kutcher are up on a tower along
with man-and-woman-on-the-tower smartphone users discussing how
much better their phones work now that the service provider switched
to base transceiver stations that use Freescale LDMOS RF power transistors.
Of course you haven't seen the ad because it would never be produced
and marketed. The very concept is ridiculous, you might say... unless
you happened to see advertisements like this one for RCA's Radiotron
vacuum tubes from the 1930s. In it, none other than Bing Crosby...
Advanced Test Equipment
Test Equipment Rentals just issued their
Tech Talk newsletter for October 2013. It includes hot topics
in the tech news world and highlights of new or special function
test equipment they have available. Please click on the thumbnail
to access the original versions.
Many Thanks to Hittite
for Continued Support
Microwave is an innovative designer and manufacturer of high performance
modules, subsystems &
instruments for technically demanding digital, RF, microwave
and millimeter wave applications covering DC to 110 GHz. The
Company's standard and custom products apply analog, digital &
mixed-signal semiconductor technologies used in a wide variety of
wireless / wired communication and sensor applications for automotive,
broadband, cellular infrastructure, fiber optics, microwave &
mm-wave comms, military, test & measurement, and space markets.
Unique Solutions Supported
by Empower HPAs
next generation hardware and software innovations that are part
of Empower's "size matters" architecture, several unique configurations
HPAs are being shipped to key customers. This particular set
of HPAs build on the size, weight and power advantages already demonstrated
with commercial product releases in the broad market, "size matters"
product family. This recent and unique
delivers 2 kW P1dB (CW, digital modulated
signal) in L-Band and a companion product delivers 800 W P1dB
(CW, digital modulated signal) in S-Band.
The 2 kW L-Band HPA is a GaN based design and housed in an
amazingly small 5U chassis.
Federal Circuit Ponders
Abandoning De Novo
involved as an
Expert Witness for a court case involving product liability
and/or IP ownership or infringement is a unique experience according
to those who have been through it. Having competent and renowned
legal representation is paramount to success, particularly if your
is a law firm specializing in expert witness cases. Every month
or so they send me an article about specific court cases that could
be of interest to RF Cafe visitors. This particular article is titled
"Federal Circuit Ponders Abandoning De Novo Review." Overturning
precedence is notoriously difficult since doing can have ramifications
that reach way back in time and can trigger appeals to long-settled
court cases. This potential for the overturning of a patent infringement
case from 1998 based on how it was constructed is predicted to trigger
significant consequences for past and future litigation...
Thanks Once Again to Vida RF
goal at Vida RF is to design and manufacture a reliable and
cost-effective RF /
Microwave Component that fits each customer's individual application.
Vida RF has the capability to produce large volume as well
as quick turnaround for your custom designs, and they will provide
the highest standards of quality products, competitive prices, quick
turnaround and exceptional customer service. RF connectors, cable
assemblies, power dividers, RF adapters & terminations, fixed
attenuators, dust caps, directional couplers, and i isolators &
circulators are among their offerings.
Music to the Ears
of an Engineer
technically oriented types often think of those with an artsy-fartsy
bent as ones who run for the tall grass when topics of science and/or
mathematics arise. Other than engineers, scientists, financiers,
etc., I would say in most cases it is justified - but not always.
In the September 2013 edition of Strings magazine, an article titled,
"How the Violin Altered Our
View of the Universe" appeared where author Paul Stein, a violinist,
educator, and member of the Los Angeles Philharmonic, evidenced
a very good grasp of science and math principles. The very decision
to pen such an article had to have been born of a knowledge and
comfort with the aforementioned. A subtitle of, "Physicist &
violinist Albert Einstein's cosmic orchestra resonates with the
music of the spheres," proves familiarity of Isaac Newton's "Music
of the Spheres," (Musica Universalis)
Electric Vehicle Conversion Handbook, by Mark Warner, is a guide
on how to convert any gas- or diesel-powered vehicle to electric
power. Includes ownership advantages, basic EV operation, subsystems,
components, basic EV operation, project vehicles, and conversion
kits. Motor and battery technology is advancing at amazing rates,
so if you don't like the weenie look of today's production electrical
vehicles and would rather try your hand at an electric conversion
on a classic 1965 Mustang, then this type of resource can be invaluable.
Ponderings on Power
Measurements - RF Cafe
Cahak, owner of Sunshine Design Engineering Services, has submitted
another fine article for posting here. Joe has many years of automated
RF testing experience to leverage when writing this paper on the
basics of power measurement. A
power measurement is a scalar quantity and is a measure of power
detected. These measurements can be made a variety of ways. Most
of us are familiar with the notion that voltage (volts) multiplied
by current (amps) is power (watts) and power multiplied by time
is energy. At DC or low frequencies these power measurements from
the current or voltage is relatively easy and not very complicated...
RF Cafe Quiz #54
Microwave Mixer Technology
quiz is based on the information presented in
Microwave Mixer Technology and Applications, by Bert Henderson
and Edmar Camargo. Some of these
books are available as prizes in the monthly
RF Cafe Giveaway. Based on a review of over one thousand
patents on mixers and frequency conversion, the authors have written
a comprehensive book for mixer designers who want solid ideas for
solving their own design challenges. Many of the important and most
interesting patents and related circuits are discussed in the several
application oriented chapters.
have always maintained that, excepting fools, men did not differ
much in intellect, only in zeal and hard work; and I still think
there is an eminently important difference." -
Charles Darwin, letter citing R.
Pearson (1914-1930) in The Life, Letters and Labours of Francis
British Radio Hoax
Traps "Pirate" Listeners
you think of radio pirate, most likely what comes to mind is a rogue,
unlicensed transmitter that is re-broadcasting copyrighted material,
syndicated shows, etc., on radio or television. Nowadays that would
also include the Internet as a medium. Did you know that, at least
decades ago, the British government (and maybe
others) charged citizens a
fee for listening to broadcasts on their household radios? That's
right, if you wanted to listen to the BBC, you would kindly remit
a fee of 10 shillings per year. Otherwise, you were apt to have
government inspectors descend upon you and padlock your radio set
- or collect the requisite 10 shillings on the spot. After a growing
number of suspected dishonest British subjects finally exceeded
the reasonable level of tolerance of the government, a clever scheme
was devised to trick evil citizens into divulging their nefarious
Thanks to Rohde & Schwarz
Rohde & Schwarz is
one of the world's leading manufacturers of test & measurement,
communications and broadcasting equipment.
spectrum analyzers, and signal generators for analog, RF, microwave,
and mm-wave signals with a standards, modulations, and functions
available at up to 43.5 GHz.
Digital Oscilloscopes for RF, analog, mixed signal & digital
integration, and software development & production up to 4 GHz
RF Power Meters up to 110 GHz.
Inc's 2013 Survey
people, according to surveys, consider starting their own businesses
at some time during their working years. The risk of failure and
the cost of startup are what prevent most elsewise entrepreneurs
from taking the leap of faith in their own abilities. Not everyone
is cut out for running a business whether it be a one-person venture
or a conglomerate with a payrolls of hundreds. Knowing and heeding
your own limitation in deciding to remain under the employ of another
company is as virtuous and sound a reason for dismissing thoughts
for self-employment as is having the knowledge and will to strike
out on your own. A lot of business are started on the sideline while
being employed fulltime in a regular job. Indeed, that was RF Cafe's
origin. It wasn't until I had confidence that I could subsist on
RF Cafe's revenue level that I left the security of the best engineering
job I ever had to tend to the website full-time
(at a substantial reduction in pay, I will
Every year or so, Inc magazine does a major poll of successful
entrepreneurs to find out what motivates them (2013
Physics & Engineering
Sunday I create a
crossword puzzle using a word list that I personally created
and added to during over a decade of making puzzles. All of the
words are related to engineering, science, mathematics, chemistry,
astronomy, etc. There are no numbnut clues about movie stars or
clothing designers. Enjoy.
Many Thanks to Nortec RF
for Continued Support!
RF has more than 22 years of experience designing power combiners
and dividers, directional couplers, hybrid couplers, filters, and
power amplifiers. Their research and development group and engineering
team constantly introduces new, top of the line products into our
RF and microwave
components product line.
Fairview Microwave Offers
Microwave announces a new line of in-stock
Zero Bias Schottky Diode Detectors. Diode Detectors are used
to rectify an RF input signal to a proportional DC output voltage. Applications
for Zero Bias Schottky Diode Detectors include precision and lab
testing equipment, as well as transmitter, power and signal monitoring
systems. Fairview's new line of Zero Bias Schottky Diode Detectors
comes in several different connector configurations and frequencies
in the 0.01 to 26.5 GHz range.
is the phone number for signing up for America's new Affordable
Care Act. Do you believe it is just a coincidence that it spells
I kid you not. From what information I could find, the lowest cost
plan for Melanie and me is the Bronze plan, which will cost $9,481
with a $12,700 deductible (only 60% coverage
after deductible is met). My current private plan through
BCBS with a $7,000 deductible (90% coverage
after deductible is met) is only $4,971. So, beginning in
January 2014 that represents a 91% increase in cost and a $5,700
higher deductible, plus only 60% coverage after the deductible is
met. I do not qualify for any subsidy. To all my fellow Americans
that voted for this crap - thanks a lot!
Modern Radio Practice in
Using Graphs and
nomographs to solve calculations is not as common in today's
world of portable high-powered computers as it was when computers
used vacuum tubes or even mechanical gears. One exception might
be the Smith chart, especially in the lab or field. You can plug
numbers into a programmable calculator or tablet app, but having
the solution presented in the form of a number gives you only that
- a number. That's usually good enough, but if you are doing troubleshooting
or tweaking a design, being able to see how the value got to be
what it is by seeing what's around it can be very helpful. The Smith
chart is a particularly good example when watching the complex impedance
point move around. The more experience you have, the less you need
such devices, but newbies...
JobLens™: Nokia's Augmented
you in the market for a new job as an intern, part-time, temporary,
or full-time worker and are not quite sure how to go about finding
out where the kind of employment you are seeking is located? Wouldn't
it be nice if you could simply drive or walk around town and any
place that fit the bill would be highlighted for you automatically?
Nokia has an app for that, and it's called
Using what is termed "Augmented Reality," JobLens assimilates a
multitude of social networking services like LinkedIn, Facebook,
Twitter, Indeed, Here Maps, Windows Live, Salary.com, Zillow, CareerOneStop,
Data.uk.gov, Payscale, and other best-in-class content partners
along with other location-dependent resources to pinpoint targets
for investigation. It might be a little underpowered when looking
for an engineering type position...
Radio Fever - Using HF Electric
God, man! Drilling holes in his head isn't the answer! Now put away
your butcher knives and let me save this patient before it's too
late!" Those classic words were uttered by Dr. McCoy in Star
Trek IV: The Voyage Home, after Lt. Chekov
(promoted from Ensign after the TV series)
sustained brain damage as a result of falling from a 'nuclear wessel'
when 20th century naval surgeons were about to open his skull to
relieve pressure from swelling. Looking at these images from a 1932
article on using
radio waves "to produce protective fever in killing germs of
a number of diseases." Update: I have
been informed that shortwave diathermy is still used in modern medicine!
10 to 30 meters was a popular wavelength band at a power of about
500 watts. The patient's body part to be treated is placed between
the plates to act "as a dielectric" while the liquids are heated
via induced oscillations similar to how a microwave oven...
Interface – Driven to Perform
succeed in automotive racing, a commitment is required... a commitment
to always ask for more and to never settle for less. Continual improvement
is necessary to stay ahead of your competition and win. This drive
to be the best is part of Interface's DNA, from our product and
service offering to the dedication of our employees. Accurate
force measurement is
a vital requirement of the automotive industry and in the competition
arena, performance demands are pushed even higher. Interface takes
great pride in being a leading solutions provider in these applications.
Whether it's for NASCAR, IndyCar, or even the amateur level, engineers
rely on Interface.
Phenomena Underlying Radio
apparatus of today, including television, uses practically all of
the physical phenomena capable of being controlled by science."
That is the opening line of a 1932 article discussing the relatively
new technology dealing with the
generation AND controlling of electrical charges. Investigators
were beginning to develop formulas and physical rules for the behavior
of electrons - at least in accordance with the accepted Rutherford-Bohr
atomic model. It wasn't until 1929 that Robert Van de Graaff invented
his eponymous generator, before which scientists like Volta used
an electrophorus (Latin for "electricity bearer")
to generate static electrical charges for experimentation by beating
a metal disc with an animal skin...
NuWaves Receives ISO 9001
and AS9100 QMS
Engineering, an international
RF and embedded
systems solutions provider, announces it has achieved both ISO
9001:2008 and AS9100:2009 Rev C certifications for its Quality Management
System by EAGLE Registrations Inc. "NuWaves is excited to join the
top tier suppliers in our industry with these highly respected quality
certifications," said Jeff Wells, President and CEO of NuWaves Engineering.
"It's a testament to our employees and their dedication to delivering
quality products and services to our customers each and every day."
Congrats to September
Book Winner Greg F.
F., of Ft. Collins, CO, is the September 2013 book drawing winner.
Greg selected Introduction to Antenna Analysis Using EM Simulators.
This book was graciously provided by
by Compliance Engineering
Engineering is an
and certification facility located in Knoxfield, Australia.
They have a few nice online RF calculators that might be useful
RF Calculator: Wavelength,
dBm, dBuV, W, dBuV/m,
V & VSWR
Radiated Power Calculator:
ERP, EIRP, dBuV/m, dBm & mW
Field Strength Calculator:
V/m, dBuV/m, dBuA/m, pT,
dBpT, Tesla, Gauss, A/m,
Linx Intros TM Series High
Technologies is pleased to announce its launch of the
TM Series Global Navigation Satellite System
(GNSS) receiver modules. At a very
small size of 10mm x 10mm, the TM Series GNSS receiver module is
a self-contained, high-performance Global Satellite Navigation System
receiver designed for navigation, asset tracking and positioning
applications of all kinds. Based on the MediaTek chipset, it can
simultaneously acquire and track several satellite constellations.
These include the United States GPS system, Europe’s GALILEO, Russia’s
GLONASS and Japan’s QZSS.
Inrush Current Protection
Using an NTC Thermistor
manufacturer Ametherm has three
notes that address the problem of limiting inrush current.
How to Stop Inrush Current: Design considerations for inrush
current protection of the AC current applicable to switching power
Transformer Inrush Current Protection: A convenient solution
to deal with the problem of inrush current exceeding saturation
current in transformers.
Thermistor Protection for a Precharge Circuit on Lithium Ion Batteries:
When a battery is connected to a load with capacitive input, there
is an inrush current surge as the capacitance is charging to the
Many Thanks to PMI
for Their Continuing
Monolithics Industries (PMI) has been
set up to manufacture and market various MIC/MMIC components, supercomponents,
and subsystems for applications in telecommunications, terrestrial,
satellite, and mobile-radio communications, defense
(ECM, ECCM, ESM, radars, and EW), cable-TV,
navigation and marine electronics, FAA/DOT-avionics, ground based
systems, and microwave landing systems.
A Personalized Phone
of this writing, at least 863,790 people believe the concept of
a modular, upgradable, personalized smartphone is a good enough
idea to invest their support in it. With 28 days left to go, the
Phonebloks developers are already at
95% of their crowdfunded revenue goal. As I reported a ways back,
while Kickstarter was the first crowdfunding venue to receive wide
publicity, there are now many such options for soliciting project
startup cash. The Phonebloks team chose Thunderclap. Thunderclap
is not actually a crowdfunding source but a 'crowdspeaking' scheme
for gathering enthusiasts for your idea. If enough people support
your project, Thunderclap will blast out a timed Facebook Post or
Tweet from all your supporters, creating a wave of attention...
for what it's worth. Phoneblok's concept is based on the belief
that the current throw-away philosophy for electronics devices -
cellphones in particular - is wasteful not just in terms of money
but in terms of...
Skyworks Intros Linear PAs
for LTE and WCDMA
Solutions introduces four
linear power amplifiers for LTE and WCDMA applications. The
fully matched surface mount SKY66001-11 (2110-2170 MHz),
SKY66002-11 (1900-2025 MHz), SKY66005-11
(850-920 MHz) and SKY66008-11
(900-990 MHz) modules meet the
stringent spectral linearity requirements of femtocell applications
with high power-added efficiency. An integrated directional
coupler eliminates the need for any external coupler.
Anatech Electronics Intros
3 New Filters &
Electronics has released new designs for a 710-716 MHz / 740-746 MHz
bandpass combiner, a 4.4 to 5 GHz surface mount isolator, a
769 to 775 MHz bandpass filter for Public Safety, and a 2500
to 2570/2620 to 2690 MHz cavity diplexer. All can be ordered
directly through our
AMCrf web store.
Thanks for Continued Support
Microwave is a professional supplier of
for WiFi, Cellular, Bluetooth, GPS, DVB-T/S/C, Satellite Communication
and related fields. A strong global channel and design group devoted
to development and innovation to meet various changeable market
needs. We strive for low cost, fast service, best prices, highest
quality and "marvelous" service. Attenuators, connectors and cables,
amplifiers, filters, and RF switches are among their many offerings.
Warfare in the Information Age, by D. Curtis Schleher. This
is an advanced practitioner's guide to current concepts and threats
associated with modern electronic warfare
(EW). It identifies and explains the newest radar communications
threats, and provides practical, "how-to" information on designing
and implementing ECM and ECCM systems. The aim of the text is to
help the reader develop ESM systems designed specifically to exploit
the vulnerabilities of modern radar. It also identifies and evaluates
ESM receiving equipment, and outlines advanced ECM methods, including
monopulse deception, coherent radar jamming, and high-ERP generation.
The Internet of Things:
Internet of Things is a term that is appearing with much frequency
these days (e.g., in this article).
Akin to 3G and 4G, the definition does not seem to be very well
defined; that is to say more subjective than objective. Per Wikipedia's
Internet of Things refers to uniquely identifiable objects and
their virtual representations in an Internet-like structure. The
term "Internet of Things" was proposed by Kevin Ashton in 1999.
The concept of the Internet of Things first became popular through
the Auto-ID Center at MIT and related market analysts publications.
Radio-frequency identification (RFID)
is often seen as a prerequisite for the Internet of Things. If all
objects and people in daily life were equipped with identifiers,
they could be managed and inventoried by computers. Besides using