new RFFM6904 is
a single-chip front-end module (FEM) for applications in the 868 MHz/900 MHz ISM Band. It addresses
the need for aggressive size reduction for typical portable equipment RF front-end design and greatly reduces
the number of components outside of the core chipset, thus minimizing the footprint and assembly cost of the overall
is cool. I saw a
U.S. Air Force recruitment ad in a 1960 edition of Popular Electronics pitching careers as radar operators
(air traffic control) and technicians (maintenance).
The picture has the dual-display glide path and elevation sweeps from the MPN/13/14 radar system that I worked
on in the late 1970s - early 1980s. A photo I took circa 1980 of our unit based at Robins AFB, Georgia, is shown
below. The precision approach radar (PAR) operated at x-band
(10 GHz) with an operational range of 10 nautical miles. The
Equipment Trailer nearest in photo, Maintenance trailer inline and connected to the rear, RAPCON separate
and to the right. ASR & IFF antennas toward center of trailer, PAR Elevation antenna nearest.
(circa 1979-82) azimuth and elevation antennas were mechanically swept with...
Networks, has commercialized some RF technology that was developed at Stanford University. Our research there
was concerned with building full-duplex transceivers, operating in the same frequency band at the same time! We're
currently making our first hires, and are looking for Senior RF Engineers to help us build our first product!
for Precise Interference Measurements in the Field, by Agilent and TESSCO, September 26, 2012, 1:00 PM ET.
Testing interference in a wireless environment is no easy task, demanding new measurement techniques and placing
added requirements on existing measurement instrumentation. Addressing it effectively requires an advanced measurement
tool like a high-performance spectrum analyzer, to evaluate, monitor and manage the interference levels between
various wireless systems.
many years, Popular Electronics had a monthly column titled "Transistor Topics" that reported on news in the world
of those newfangled semiconductors. To wit, this article from the April 1960 edition begins, "Each month, more
and more transistorized consumer products are developed as replacements for vacuum-tube designs." The Heathkit
TCR-1 clock radio is featured for its six-transistor superheterodyne AM receiver circuit. A mechanical clock is
still used since other than using Nixie tubes, digital displays were not commercially available. The MOBIDIC "super"
computer is also covered for its total transistorization. At about 4 feet wide and 6 feet tall, it is hard to
believe that the "MOB" portion of the acronym stands for "mobile...
or Snakes- Which do cars hit more? ROADKILL EXPERIMENT, by Mark
My daughter, Sally, sent me this video link.
For some reason she thought I would appreciate it - probably due to my love of the scientific method ;-)
host Sam Roberts (never heard of him) is on the scene in Manhattan talking
to someone who has been sitting in line for her new iPhone 5
for two days. Recently posted, this video has near half a million views already. Incoherency, irrationality and
self-contradiction are mild adjectives for describing the poor girl's responses to Sam's questions. In her defense,
sitting in line for two days straight can take its toll on the mind... but then sitting in line for a phone for
two days is not much of a defense for incoherency, irrationality and self-contradiction. Some people think it's
staged since she is well groomed and wearing nice clothes. What do you think???
Ohms is a regular feature of Design News that presents submissions from readers about troubleshooting challenges
and how they were solved. This one is titled "Case
of the Data-Corrupting Pocket"
is an interesting article in the
NY Times discussing the immense amount of power consumed by Internet data centers.
Google's consume nearly 300 MW and Facebook's about 60 MW. They
require an awful lot of coal, natural gas, uranium, and wood chips; i.e., not very green. Only a small percentage
comes from wind and solar. A consulting firm determined that only 6-12% of power was actually used by microprocessors
to run the machines; the rest was feeding idle circuits on standby for surges or as redundancy in case of failures.
I'm guessing the people who claim to boycott non-eco-friendly businesses do not opt themselves out of Internet
usage... but think you and I should.
RF & Connector Technology (RFCT), +82 505 274 0002 /
Suwon, Kyounggi ,Korea
Coaxial connector, cable assembly, RF passive components, WiFi routers.
the sake of avid cruciverbalists, each week I create a new
crossword puzzle that has a theme related
to engineering, mathematics, chemistry, physics, and other technical words. You will never be asked the name of
a movie star unless he/she was involved in a technical endeavor (e.g., Hedy Lamar).
searching for information on vintage model airplanes and rockets, I ran across these pages from
1930s era Christmas
catalogs from the Spiegel and Sears Roebuck companies. I can remember as a kid in the 1960s carefully leafing
through the Christmas Wish Books when they came in the mail, being sure not to miss a single control line airplane,
slot car racing set, model train setup, BB gun, chemistry set, GI Joe action figure (although they weren't called
that at the time), backyard tent and camping equipment, bicycle, mini bike, and a host of other "guy" stuff. According
to the 1933 Spiegel Christmas catalog, a tabletop 5-tube AC-DC radio from Philco plus an RCA Victor phonograph
combo cost $49.95. It sure seems like a heck of a deal until you consider that the BLS CPI* inflation calculator
says that price in 1933 is equivalent to $885.19 in 2012 dollars...
Q-par Angus has released its September
is pleased to announce the launch of a high performance 3 port, 1.2 to 8 GHz, 180 degree power divider, intended
for use with dual polarised high power wideband antennas requiring balanced feeds.
performance microwave antennas and Microwave engineering consultancy service available.
Solutions today announced that it has received the Best Vendor and Outstanding Delivery Awards from
for supporting their growing RF business without a single part shortage in the last three years.
Skyworks is now ZTE’s leading front-end solution supplier
and has supported several major product launches.
maintains inventory of more than 35,000 RF and microwave components and assemblies, all available for same-day
shipment from the United States. Spur Microwave joins
the growing list of international distributors who are helping
Pasternack expand their product offering and customer
service worldwide. With this new partnership, Spur Microwave’s customers now have access to the industry’s broadest
selection of quality RF and microwave components.
it is the year 2012, a full 81 years after this editorial was published in ARRL's QST magazine, and nobody is
any more certain of the origin of the
term "Ham" being applied to amateur radio operators than they were in 1931. Being closer to the date of origin,
though, might have given editor Kenneth Warner a bit more insight. In fact, the term Ham is usually uttered in
a mildly pejorative manner; e.g., "he is such a ham." Per the QST's editor's research, Ham might be a shortening
of Hamlet, referring to Shakespeare's play and the 2-bit actors who endlessly recited the lines in an attempt
to impress others. Analogously, a Ham radio operator would be a professional broadcaster wannabe. However, Mr.
Warner offers and even more plausible explanation that has the term descending more directly from the craft of
amateur radio operation. Read on to find out...
old adage about a picture being worth a thousand words is validated often with charts and graphs made for science,
engineering, and finance. This chart illustrates levels of
collaboration between 25 countries on scientific
papers published in 2011 in a select group of journals. Author John Sexton uses color and line width to indicate
origin and volume between countries. Circumferential length is relative volume overall. He also includes a similar
chart showing internal collaboration within the 10 countries with the highest scientific paper output. Per Mr.
Sexton, in 1996 about 25% of scientific articles were authored by people in two or more countries; today it is
35%. Non-commercial "Big Science" projects like the Large Hadron Collider (LHC) at CERN, with multinational funding,
contribute largely to the increase. Aptly pointed out is how global access to and...
and Microwave Engineering: Fundamentals of Wireless Communications, by Frank Gustrau, addresses a wide
range of radio-frequency and microwave topics with emphasis on physical aspects including EM and voltage waves,
transmission lines, passive circuits, antennas, radio wave propagation. Up-to-date RF design tools like RF circuit
simulation, EM simulation and computerized smith charts, are used in various examples to demonstrate how these
methods can be applied effectively in RF engineering practice.
tubes and sockets, 12 capacitors, 7 resistors, 4 inductors, 3 transformers, a crystal, a meter movement, a switch
, a bulb, 3 jacks (for a tuning meter), a project box, a handle and and little hookup wire and solder. That's
all it used to take to construct a home brew dual band (5- and 10-meters) amateur radio transmitter as featured
in the February 1941 edition of QST. You can probably find all the parts at a Hamfest to make one today, but you
will need to modify the 5-meter band circuit to current 6-meter band operation since there is no 5-meter band
anymore (lost to VHF television)...
is common in electronics courses for an
to be drawn between electrical and mechanical phenomena. In fact, a lot of circuit analysis methods and equations
apply directly to mechanics, and vice versa. An LC (inductor-capacitor) oscillating
tank circuit is akin to a spring and dashpot. Resistance of a wire is likened to skin friction of water flowing
through a hose. Who among us can forget those lessons? This Electronic Analogy Quiz from the November 1961 edition
of Popular Electronics presents a challenge both because some not-so-familiar examples of analogies are offered,
and because some are a real stretch. Therefore, don't feel too bad if you don't get a few. That's my way of saying
that I didn't get all of them right...
Systems, LLC, a subsidiary of Bird Technologies, today introduced Version 3.0 of its
RF Editor Graphical RF Editor software, the industry’s
most advanced tool for modifying and building custom RF signal waveform files for use in defense, commercial,
and system verification applications. RF Editor Version 3.0 is more intuitive, faster, and adds useful features
that expand its capabilities.
RF, the leading online RF Product Search website, has
now added a parametric search tool for Test & Measurement Equipment to the website. Users can now search for
Equipment like Spectrum Analyzers, Network Analyzers, Signal Generators and Power Meters by specification across
multiple manufacturers and compare products that meet their requirement side by side.
provides high-frequency EDA software for the design of wireless telecommunications equipment & semiconductors
Microwave Office, Analog Office, Visual System Simulator™ (VSS), APLAC, Axiem 3-D EM simulation.
to 39% of recruiters, the single biggest obstacle for an unemployed candidate in regaining employment is having
a history of "hopping
jobs," or leaving a company before one year of tenure. 31% consider being out of work for more than a year
as the greatest challenge in regaining employment, followed by having gaps in your employment history
a little more electronics
humor from the November 1961 Popular Electronics. This time the topic is stereo equipment...
Angus designs and manufactures antennas, positioners, components and complete subsystems across the radio frequency
spectrum, with specialisation in microwave & millimetric systems. Custom products designed to your specifications
available. I recommend you read the story on how
Q-par Angus got their
photographer Chris Tangey caught this rarely seen "fire devil" on video.
Just as a water spout is formed when a tornado touches down on a body of water and sucks water up into itself
and a dust devil sucks up dust from the desert surface, this tornado landed on a brush fire and sucked the flame
up into a 100-foot high towering inferno. Hence the name fire devil. I wonder why water spouts aren't called water
Power Products introduces their Model IPP-8051, a 150 watt,
20 dB, Surface Mount Dual Directional Coupler that operates from 800–2500 MHz. The IPP-8051 is a unique
broadband design which provides separate coupled ports for both forward and reflected signals with internal Terminations.
SMD package size is 1.50 x 1.00 inches. IL is less than 0.40 dB, main line VSWR <1.25:1, coupled flatness
is < ±0.85 dB and directivity > 20 dB.
is presently accepting a limited number of “Late News” papers. Please refer to
Author’s Guide for the details.
Application Note: Design
of a Near Field Communication Antenna System - This app note describes a sample Rohde & Schwarz NFC design.
AWR Connected™ Application Note:
Design Flow for
Base Station Antennas - This design note describes how antennas designed in Antenna Magus can be exported
as models to AWR’s Microwave Office/ AXIEM software.
This webcast explains the principles of
both OFDM and MIMO with an intuitive approach, and describes how they operate so well together in demanding
applications. MIMO is contrasted with other multi-antenna techniques such as diversity and space-time coding.
Common measurements are discussed along with the practicalities of single-channel and multi-channel testing.
contractors." That's what Joseph Salvucci, owner and CEO of Peak Technical Staffing USA, calls many of the engineers
who find work through his firm. These highly trained professionals aren't looking for full-time jobs that will
last them 20 or 30 years. Instead, they're looking for contract work: short-term jobs — anywhere from a few months
to a couple of years — that pay well, offer certain degrees of flexibility and give them a chance to practice
their craft at a very high technical level.
announces a new RoHS compliant VCO model USSP1217-LF in the L-band. The
at 1210 to 1230 MHz with a tuning voltage range of 0.5 to 3.0 Vdc. This miniaturized VCO features phase noise
of -102 dBc/Hz @ 10 kHz offset while operating off a 3.3Vdc supply and typically drawing only 13mA of current.
is a little electronics hobbyist humor in the form of comics. For the non-Ham, QRM is the Q-code for "manmade
interference." You don't need to be an amateur radio operator to appreciate those first two scenarios. The
others are more generally related to electronics...
quiz for you to try. It covers the functions of resistors in various circuits. The quiz appeared in the January
1962 edition of Popular Electronics. I got 100%, just for the record. Having worked with tubes helps with figure
B since it does not really have a direct transistor equivalent, but by process of elimination you can get it...
• RF Component
Integration-Saving Space in High Performance Apps (p.30), by A. Elghamrawl and E. Nash
Simplified Power Handling Analysis of Microwave Filters, by M. Hagensen, Guided Wave Technology and A. Edquist
Harmonic Suppression of Edge Coupled Filters Using Composite Substrates, by J. Coonrod
• Design a Double-Layer Shield,
by R. Xiong, B. Chen, B. Zhou, and Y. Mao
• Building More
Efficient Amps, by Jack Browne
Materials Pave Way to Military Advances, by Jack Browne
capacitors play a vitally important role in electronic circuit design. Many people do not know the proper way
for deciding which capacitor or capacitors is/are needed for effective noise and/or signal bypassing without
either overdoing or underdoing it. Needs change over the years as frequencies and signal characteristics occupy
new realms of the spectrum. A Fourier analysis of some of today's complicated waveshapes for switching power supplies
shows how sometimes tailored responses to bypassing is required. This article from the January 1962 Popular Electronics
does not delve into the intricacies of complex filters, but it does provide a nice introduction to the need for
bypassing and how to stand a good chance of being successful at it. In rare instances, no amount of bypassing
will solve problems with spurious signals and a more engineered approach is required where the functional circuit
needs to be modified (I know this from experience!)...
Switching Power Converters for Analog and RF Loads, by AWR, Beeser, & MWJ, Tuesday, September 18, 11 am
Microwave has launched two new power amplifier products which are ideal for microwave radio, EW, ECM and radar
applications to 28 GHz. Also released is a unique
wideband LNA which operates
from 300 MHz to 20 GHz and is ideal for wideband multi-chip-module and subsystem applications.
Devices has introduced three high-performance 16- and 14-bit transmit
DACs with extended operating temperature ranges and
high-reliability packaging for radar, secure communications, avionics, and other defense electronics applications.
Designed for signal synthesis applications, including pulse-modulated waveform generation and for synthesizing
the modulated carrier in quadrature digital architectures.
The Search function is now working again on RF Cafe. I did not even know it
was broken until Google displayed an error message on the Webmaster maintenance page. Somehow I managed to tell
it not to index the homepage so it ignored everything. This only affected Google search, not any of the other
Cafe Circuits & Components Forum contributor has posted a question asking about effectively shielding DC power
cables when passing through a shield enclosure. Please respond if you have an idea. Thanks.
the sake of avid cruciverbalists, each week I create a new
crossword puzzle that has a theme
related to engineering, mathematics, chemistry, physics, and other technical words. You will never be asked the
name of a movie star unless he/she was involved in a technical endeavor (e.g.,
the recent epic patent-related court battle that resulted in Samsung being ordered to pay Apple one billion dollars
in damages? Well, Samsung paid payed up - with 30 truckloads of 5-cent coins! Per the article: "This morning more
than 30 trucks filled with 5-cent coins arrived at Apple’s headquarters in California. Initially, the security
company that protects the facility said the trucks were in the wrong place, but minutes later, Tim Cook (Apple
CEO) received a call from Samsung CEO explaining that they will pay $1 billion dollars for the fine recently ruled
against the South Korean company in this way." While this certainly is hilarious, the fact is that it must have
cost Samsung a significant amount of money to have 30 trucks filled with coins and to pay for the security for
having it transported to Apple. Sure, it'll cost Apple some amount to process the exchange (no pun intended on
the "change" part of "exchange"), but Steve's ghost and Apple shareholders are doing the real laughing as they
deposit an additional $1,000,000,000 into the coffers and then collect dividend checks. Word has since come
out that this is a fake story!
I will be away from my computer for a few hours at a time this afternoon and tomorrow evening, so there could
be a delay in responses.
Micro Devices announced today that it is enabling Samsung’s next-generation GALAXY Note II with RFMD’s
PowerSmart® Power Platforms – the
industry’s first and only converged multimode, multiband (MMMB) power amplifiers.
Microwave has recently reduced the list price of several of the GaAs HBT Ultra Low Phase Noise Amplifier modules.
These rugged connectorized amplifiers are ideal for high performance applications in microwave radio, military &
space, radar systems, test instrumentation and synthesizer applications from 1.5 to 12 GHz.
ambition of amateur hobbyists has always amazed me. In practically every area of technology, amateurs have contributed
significantly to the effort of pushing back the frontiers of ignorance by developing new applications, improving
existing products, and demonstrating to commercial companies a need for new features or products. Many of those
innovative hobbyists make a living in the field they choose for off-hours recreation. As a heavy reader of technology
and hobby magazines of all sorts, I know this to be true for musicians, boaters, pilots, radio operators, gardeners,
science experimenters, woodworkers, and many others. Levels of quality of finished products are awesome in the
master class competitions. The amount of money spent by some for their "hobbies" is shocking. This
communications article from the May 1970 Popular Electronics is a prime example of that. The author uses off-the-shelf
is a really good introductory article on
(EM) fields as they pertain to inductors, transformers, and antennas. It appeared in the April 1942
edition of QST. The FCC had only been in existence for eight years at the time and was pretty much just figuring
out how to regulate the heck out of everything. The author discusses compliance issues for these newfangled RF
devices that were becoming more and more numerous. Interestingly, the first sentence says, "Every time you threw
the transmitting switch in pre-war days...," bringing to mind how the Feds banned Amateur Radio during most of
World War II for security reasons as well as to assure that scarce resources went toward building and servicing
military gear as needed. Many Hams offered their gear either as a...
is offering Low PIM versions of the popular
7/16, Type N, and SMA connector that can deliver Low PIM performance as low as -170 dBc Just like with all
of the RF Components that VidaRF offers, we are happy to build to your specifications.
guru Jon Titus has posted this short review on anti-alias filters for use in digital sampling systems. A nice
thing about Jon's articles are that he will usually answer questions posted on the page by readers.
offers a wide selection of directional couplers, dual directional couplers and hybrid couplers, designed to cover
0.1-20 GHz. Average power from 50 W to 1 kW. Standard coupling values 3, 6, 10, 15, 20, 25 and
30 dB. Custom solutions available.
AM1650DC836 directional coupler operates from 800 - 2500 MHz with a 13 dB coupling value. The
AM625-875CIR191 circulator operates from 625-875 MHz with isolation of at least 18 dB. The
AE803NS2065 bandstop filter has a notch bandwidth of 800 - 806 MHz, rejection greater than 70 dB.
wall-to-wall carpeting really came into vogue in the late 1960s to early 1970s - just in time for the arrival
miniaturized microelectronics (is that redundant or just superfluous?).
Gate widths were being shrunken rapidly as the birth of the Moore's Law era was in its infancy
(born in a 1965 paper written by Intel engineer and co-founder Gordon Moore).
The result was copious quantities of electronic gadgets being zapped when the unsuspecting user would walk across
the Van de Graaff generator in the form of floor covering and reach for a dial or switch. A couple thousand volts
could easily build up on a body clad in lime green polyester pants (remember
the era), then fzzzzt, there goes the clock radio...
and termination equipment for RF Digital broadcast equipment - RF monitors, high power meters, plug-in elements,
field strength meters, line sections & elements, signal samplers.
a WAR to be won." So goes the headline in an advertisement in the April 1942 edition of QST magazine. Like many
American companies during World War II,
Cardwell Manufacturing Corporation
gave its highest priority to serving the needs of our nation's military. Patriotism was actually taught in schools
back in the day, and the majority of citizens understood the need to devote their efforts to achieving victory,
even if it meant putting personal interests on hold. The ad content typifies that attitude...
Cosite Interference Analysis in a Unmanned Aerial Vehicle (UAV), by CST, Thursday, September 13, 11:00 am EDT
is a new computer font available to astronomers: Galaxy. Well, not really, not yet, but at some point there probably
will be. The rendition of "rf cafe" shown here was generated automatically by a website called "My Galaxies."
Thanks to thousands of volunteers worldwide that have participated in The Galaxy Zoo's project of classifying
galaxies, a set of letter-shaped galaxies has been identified that can be used to write words like "rf cafe."
It appears that so far God (or the Big Bang - take your pick) did not
create a full set of upper case letter-shaped galaxies. Some letters can be considered upper or lower case, like
Cc Ii Jj Oo Pp Ss Uu Vv Ww Xx Zz. As you might imagine,
there are number-shaped galaxies as well. After all, mathematics...
Microwave-East today introduced
a high-power, 2-way power divider that operates from 500 MHz to 2.5 GHz, handles up to 250 W CW
input power (2 kW peak power), and is well suited for both commercial and military applications.
Microwave has recently reduced the list price of several of our pHEMT Low Noise and Power Amplifier modules. These
rugged connectorized amplifiers are ideal for high performance applications in microwave radio, military &
space, radar systems, test instrumentation and synthesizer applications from 1 to 36 GHz.
Modelithics COMPLETE Library is a collection of the industry's most advanced simulation models for passive components,
transistors, diodes and more. The combined product offerings of
libraries alongside AWR's Microwave Office software gives microwave designers immediate access to high-fidelity
parameterized models that better predict real-world behavior when simulated within the AWR design environment.