These archive pages are provided in order to make it easier for you to find items that you remember seeing on the
RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the Google Search box
in the upper left corner of every page
you don't mind having your circuits in the public domain, then
CircuitLab is a very nice FREE, online SPICE type
circuit simulator with a professional quality user interface and output graph function. CircuitLab handles
analog, digital, and mixed-mode simulations with DC, AC, swept time domain and frequency responses. After
signing up for an account, you have access to a large number of user-generated circuits that are available for
use as-is or for modifying to meet your particular needs. You can use CircuitLab without creating an account,
but then you will not be able to save or recall your circuits. A large
library of pre-defined components are
available, and standard SPICE expressions can also be entered.
Anatech Electronics Intros 4 New Filters
Anatech Electronics has published its May 2013 newsletter. As always, it includes both company news and some tidbits
about relevant industry events, regulations, and standards. This month highlights a
1524 to 1560 MHz | 1626.5 to 1660.5 MHz cavity duplexer, a 55 MHz highpass filter, a 806 to 894 MHz/902 to
960 MHz cavity duplexer, and a 1515 MHz lowpass filter. Anatech Electronics' Sam Benzacar invites you to visit
them in booth #2710 at the IMS 2013 trade show in Seattle, Washington.
RF Cafe Poll Started 5/15/2013
take a moment and vote in this poll. No sign-in-required. Results are displayed automatically. Thanks!
Z-Comm's Ultra Wideband VCO Tunes from 2.7 to 5.4 GHz
new V600ME31-LF operates from 2700 to
5400 MHz with a tuning voltage range of 0-24 Vdc. This octave tuning VCO features a typical phase noise of
-107 dBc/Hz @ 100 kHz offset and an average tuning sensitivity of 140 MHz/V. The V600ME31-LF is ideal for
satellite communication applications. It is designed to deliver a typical output power of 7 dBm into a 50 ohm
load while operating from a 5 Vdc supply and drawing only 25 mA. It is designed to operate over the industrial
temperature range of -40 to 85ºC while suppressing the second harmonic to better than -20 dBc.
Amateur Radio Quiz: Vintage Radios - Such a Bargain!
Ward Silver, N0AX, created the newest Amateur Radio Quiz titled "Vintage
Radios - Such a Bargain!" N0AX says, "Who can resist taking a long look at the
vintage veterans sitting
along the aisles of the flea markets? Hey, I'm talking about the radios, not the attendees! 'Big iron' is
making its comeback with Johnsons and Hallicrafters
and Swans shoulder-to-shoulder at the hamfests. Before you test your lumbar regions by lugging one home, you
might want to exercise your antique assessment skills first!"
Please Visit Z-Comm in Appreciation of Their Support
Z-Communications is a world leader in the
and development of surface mount VCO (voltage-controlled oscillator) modules & PLL (phase-locked loop) frequency
synthesizers for the commercial microwave/RF wireless market. RoHS compliant signal source products currently range
from 40 MHz to 13.5 GHz bands. PLLs available in integer, fractional-N and single frequency models.
Watch 32 Metronomes Synchronize with Each Other
If you place those
on a rigid surface, they will continue to run out of synchrony forever. If instead you place them on a
moveable platform, it will begin oscillating side to side with increasing amplitude until the discordant
rebels finally comply. There is probably a social behavior parallel somewhere, but the more important
principle at work is the likening the system (metronomes + moveable platform) to a resonant circuit with
feedback. Surely someone reading this can supply an equation for us that models the phenomenon.
Featured Book (please help support RF Cafe)
of RF, Microwave, and Millimeter-Wave Components, by Sergey M. Smolskiy, Leonid A. Belov, and Victor
N. Kochemasov. This unique and comprehensive resource offers you a detailed treatment of the operations principles,
key parameters, and specific characteristics of active and passive
RF, microwave, and millimeter-wave components.
The book covers both linear and nonlinear components that are used in a wide range of application areas, from
communications and information sciences, to avionics, space, and military engineering. This practical book presents
descriptions and clear examples and of the best materials and products used in the field, including laminates, prepregs, substrates; microstrip, coaxial and waveguide transmission lines; fixed and rotating connectors; matching
and adjusting elements; frequency filters; phase shifters; and ferrite gates and circulators.
A New Direction for AMC and PMI
Raymond Sicotte, Chairman and CEO of
American Microwave Corporation(AMC), and
Ashok Gorwara , Chairman and President & CEO of Planar
Monolithics Industries, Incorporated (PMI), wish to announce that they have completed realignment and
separation of AMC and PMI. Mr. Sicotte and Mr. Gorwara were formally colleagues at MIT Lincoln
Laboratory in the late 1960's. Each is very well recognized for his extensive expertise in the
microwave electronics field and industry. Each Company has developed its own complete manufacturing,
engineering, research & development capabilities and facilities as the individual companies have grown and
PMI Intros 30 MHz to 18 GHz Broadband LNA
Amplifier Model PEC-38-30M18G-12-SFF is a
noise amplifier that operates over the 30 MHz to 18 GHz frequency range. This model provides 38 dB of gain
and has a gain flatness of ±2.0 dB maximum. The noise figure is 5dB maximum and the OP1dB is +12 dBm minimum.
This amplifier maintains a maximum VSWR of 2.2:1 into a 50 ohm impedance. The operating voltage is +12 VDC and
the current is 300 mA maximum.
Kete Microwave Intros New Line of Isolators & Circulators
Microwave Company announces a kind of new product: Microstrip
frequency range from 5.2-40 GHz with full band. These devices have
dual junction circulators as well. These parts are made of golden leads, ferrite material and thin film technology.
They are stable performance with good quality. To find more information, or to purchase these products,
please you visit the links from Kete Microwave's website.
Please Welcome RFIC Solutions as Our Newest Advertiser
RFIC Solutions offers RFIC/MMIC,
Digital IC and module, RF system design services,
RF prototype board development and RF testing up to 60 GHz. The RFIC team of 40+ staff, mostly engineers
has delivered more than 30 million RF ICs for Wireless LAN, Cordless & Cellular Phone & wireless apps.
The RFIC team has extensive RF industry knowledge with many years of background in designing and deploying Wireless
Systems. RFIC has a strong background in designing wide range of products from RF amplifiers, Switch to complex
Mixed-Signal SoC like 'RF CMOS Transceiver' & and other ICs up to 60 GHz. Click here to download our Company
1948 was a mere two and a half years after the end of World War II, so military planners strategized about
what a future war, if one occurred, would look like. Two implements that had a huge effect on the previous efforts
were the atom bomb and the
guided missile; therefore,
they were prominent in discussions. Germany's use of the V-1 Buzz Bomb is a familiar example of a guided missile
that struck terror in the hearts of populations that experienced its devastating destructive power. The U.S. developed
a few missiles of its own, particularly immediately after WWII when it had the assistance of Werner von Braun
and other notable rocket scientists who worked for the U.S. space effort after the war. A few of the missiles
are on display today at the
center of the National Air and Space Museum.
Thanks to Dong Jin Technology for Continued Support!
a premier manufacturer of RF connectors, cable assemblies and components, Dong Jin TI is highly recognized an
RF industry leader in Korea. Our premium products offer
a competitive price, on-time delivery and best quality in the industry. Attenuators, arresters, adaptors, bias
tees, filters, terminations, directional couplers, and power combiners and dividers, are among Dong Jin TI's offerings.
Agile Microwave Technology Added to Vendor Listings
Microwave Technology, Hicksville, NY. Agile MwT's motto says, "This company may be new, but we're not newcomers
to the high reliability RF/Microwave industry." The three founders have more than 100 years of combined experience.
Agile MwT specializes in RF amplifiers, limiters, switches,
and multipliers. "Our goal is to cut product cost by more than 50% by keeping our overhead low, by staying
small and focusing on innovative designs which are inspired by the commercial wireless market. Our goal is to
provide same or better performance, size and quality at a much lower cost through better engineering and outsourcing
to U.S. based contract manufacturers."
tried everything from seed oils to high-temperature lubricant to glycerin in search of the right liquid. It's
the closest I've ever felt to Thomas Edison when he was looking for the perfect element" -
Dave Horn, Switch Lighting CTO, regarding the liquid silicone cooling used in their 'game-changing' LED light
If You Appreciate Fine Watchmaking...
probably a safe assumption that most electrical engineers and technicians appreciate intricate,
mechanical creations. Gizmodo has an article that highlights some incredible wearable timepieces
(aka watches). As author Andrew Liszewski puts it, "Gadget nuts have
CES, kids at heart get Toy
Fair, video gamers have E3, but if it's watches that ring your bell,
every spring you'll want to head over to Basel, Switzerland for Baselworld. It's where the world's
masters gather to unveil their latest timekeeping works of art. And these are the most wonderful of this year's
whole bunch. "
RF Engineering Crossword Puzzle for May 12, 2013
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.
The Antenna Research Laboratory
1950, say the author of this story, "No longer are 'aerials' merely required to transfer electromagnetic energy
into space," in reference to airborne platforms. Following great advancements in radio and radar technology during
World War II, great interest lied in what would later become referred to as 'stealth' technology and in secure
communications. The transition of aircraft speeds into the realm of supersonic also mandated that projections
beyond the main airframe outline be either eliminated or very much minimized. The
long cable aerials that stretched from the cockpit area to the tip of the vertical fin, and the
direction finding antennas hanging from below could not be accommodated at airspeeds above about 300 knots.
The aerodynamic drag would be excessive and the forces would tear the antennas apart. Douglas Aircraft set up
one of the first antenna measurement laboratories specifically to address those issues both for airborne and shipboard
1st Radar Images of D-Day Invasion
occurred on June 6, 1944. It was the day that Allied forces stormed the French coastline with overwhelming numbers
of battleships, landing craft, bombers, fighters, and personnel. It broke the German stronghold on mainland Europe
and marked the beginning of the end of Hitler's dominion. These photos are the first official releases of
radar imagery before
and during the D-Day
invasion at Normandy. Pre-invasion reconnaissance radar plots show a sparsely populated coastline and English
Channel. White areas that indicate radar targets were concentrated mainly in city regions. On the day of the invasion,
white returns nearly saturate the displays due to the incredible presence of all the aforementioned war machine
elements. Even the soldiers' presence contributed to the return because of all the metallic hardware being carried
- guns, ammo, radios, helmets, bayonets, canteens, etc...
Please Welcome Asian Circuits as Our Newest Advertiser!
Circuits, with its HQ in Toronto, Canada, and production facilities in China, has emerged as a well known turn-key
PCB assembly service provider for mid- and high-volume
electronic contract manufacturing.
Asian Circuits is well known for providing economical one-stop PCB assembly services, including PCB fabrication,
sourcing of components, and complete. Our online
PCB assembly quote generator
can help you estimate the assembly cost of your PCB project from the very beginning.
PMI Intros 2 to 18 GHz Flat Gain Low Noise Amplifier
Model No. PBB-20-218-16-LCA
is a 2.0 to 18.0 GHz Low Noise Amplifier which provides 20 dB of gain while maintaining a gain flatness
of ±2.0 dB maximum over the operating frequency. The noise figure is 4 dB typical and offers a typical
OP1dB of +14 dBm minimum. The amplifier requires +12 to +15 VDC and the current draw is 150 mA
Custom-Cal Listing Added
experts routinely repair sophisticated and expensive instruments, often providing the flexibility to defer capital
investments in retooling and new equipment. We specialize in optical, RF and communications test equipment repair,
often considered too complex by other independent repair facilities.
NuWaves Intros Bidirectional RF Power Amplifier
NuWaves Engineering announces the release of the NuPower Xtender
bidirectional L- &
S-band power amplifier module, model number NW-BSSPA-10W-1.0-2.5. The product is the first in the company’s
new Xtender series of bidirectional power amplifiers, which are based on the successful NuPower broadband, high-efficiency,
miniature PA modules. Designed for use with half-duplex RF transceivers running constant-envelope waveforms, the
new bidirectional PA provides a minimum of 10 Watts peak RF output power and 40 dB of gain with 30% average
power efficiency from 1000 to 2500 MHz.
Is Stratovision the Answer?
sounds about as serious as 'Wonkavision,' but unlike the candy maker's fictional machine that transported chocolate
bars across the room,
was in fact a serious proposal. It was an early form of satellite television. Since orbiting communications satellites
would not be practical for another decade, Westinghouse devised a system in 1945 using aircraft flying at high
altitude to relay television signals. Engineers calculated that 14 airplanes circling at 25,000 feet could provide
coverage to 78% of the country. By 1950 they had a working system, but needless to say (because nobody has ever
heard of it... except you, now), the concept ultimately did not pan out. It was not because the system failed
to work as designed, but because there was not enough demand for coast-to-coast broadcasts at the time.
Glowing Trees a Problem for Astronomers
controversy brews over the merits of breeding plants that glow like a lightning bug. Proponents say
glowing trees could eventually replace
electric street lights, thereby reducing pollution created by generating stations. Opponents say messing around
with tree genes is dangerous and should be disallowed since it could lead to unanticipated environmental ramifications
on both plant and animal species. The unique aspect of this effort is that it is being pursued primarily by genetic
hobbyists rather than corporations - at least for now. There is bound to be a huge financial potential for such
a copyrighted line of plants. My opposition to the concept is primarily a concern for light pollution projected
skyward. Astronomers have a difficult enough time with ever-encroaching sources of ambient light, but a planet
overrun by cross-bred and mutated glowing plants (and possibly animals), especially if they are capable of emitting
levels high enough to replace street lights, would effectively blind billions of dollars of investments in telescopes...
Featured Book: Please Support RF Cafe
to Modern EW Systems, by Andrea De Martino. Master the latest
electronic warfare (EW) techniques and
technologies related to on-board military platforms with this authoritative resource. You gain expert design guidance
on technologies and equipment used to detect and identify emitter threats, giving you an advantage in the never-ending
chess game between sensor guided weapons and EW systems. This unique book offers you deeper insight into EW systems
principles of operation and their mathematical descriptions, arming you with better knowledge for your specific
communications and their communicators have always been held in high regard. Operating and maintaining sophisticated
electronics equipment is difficult enough on solid ground, but doing it on the ocean with winds and waves tossing
the platform (ship) relentlessly can exacerbate the problem tremendously. It is a wonder that radar systems can
even be useful with the antenna constantly rotating about pitch, roll, and yaw axes while simultaneously shifting
in the x, y and z axes. Sure, airborne platforms have the same sort of challenge, but their perturbations are
not typically as violent, as great in magnitude, or as prolonged as a naval vessel in rough seas. For the record,
I'm a former USAF radar guy so I'm not just trying to glorify my own branch of service. This article from Radio &
Television news gives some insight into the life a naval communicator during the 1950s.
RF Cafe Poll Started 5/7/2013
take a moment and vote in this poll. No sign-in-required. Results are displayed automatically. Thanks!
Please Visit Colby Instruments in Appreciation of Support
Instruments designs and manufactures the world’s finest high-precision
Programmable Delay Line (PDL) instruments and modules.
All instruments are fully programmable via GPIB interface, and are suitable for use in high frequency RF signal
applications as phase shifters or where an extremely high precision and accurate amount of delay is required.
125 Femtosecond steps have been achieved in some products!
Introduction to Professional Wireless Communications
Bensky, author of
Short-Range Wireless Communication(and ironically the book selected by
April's book drawing winner), is the presenter in
this online introductory level 1-day course (May 15, 9:00am - 4:30pm EDT) for
individuals interested in an overview of wireless telecommunications. "This course may be used as introductory
training for students pursuing IEEE's WCET professional certification. It is also ideal for anyone who wants a
more firm grasp on what the technology in the products they are selling is, the fundamentals of what it can do
and what wireless communications professionals on the engineering front are working on developing for future applications."
Thanks to ISOTEC for Renewing Their Support Again
our inception in 1996 in Korea, ISOTEC has been a leading manufacturer of
RF and microwave connectors such as SMA, MCX, SSMB,
etc., and RF components such as attenuators, terminations, etc., for wireless service providers, etc. We provide
recognized and trusted products and service to our customers in more than 30 countries worldwide. ISOTEC offers
also an extensive product mix with RF filters and multiplexers etc."
CEI's Electronics Slide Rule Advertisement
wasn't until February 1 1972, that Hewlett-Packard introduced the HP-35 electronic calculator. Before that, when
you spoke of an electronics calculator it referred to a computer (likely a vacuum tube type), a human who specialized
in electronics calculations, or this special slide rule sold by Cleveland Electronics Institute - the
It had special scales for calculating reactance, and resonance, and had common circuit analysis formulas printed
on the back side.
Working Hard or Hardly Working?
someone has greeted you with the trite line, "Working hard or hardly working?" It used to be funny enough. Chances
are you are working hard, but nowadays the likelihood that someone is
hardly working is growing greater every
day. The real unemployment rate (U6)
in the U.S. is around 14% per the BLS
website. About half the population pays no income taxes (yet receives the most benefits),
and a huge number of people are receiving food stamps. My county of Erie, PA, is at 19%
your area's rate here). Have you seen the stories of
Probably not if all you watch is mainstream news.
Immigration Reform(a misnomer) is about to exacerbate the problem. A smaller
portion of us are pulling the wagon while more are piling in for the good ride. We have become the United States
of Greece (apologies to hard-working Greeks).
Sherlock Ohms: The Case of the Lucky Touch
both a technician and, after earning a BSEE degree, an engineer, I have done a lot of circuit troubleshooting
in my life, so I really like reading the short accounts of other people's experiences in tracking down and solving
problems. The Sherlock Ohms series from Design News is a great source of such stories. This one is titled "The
Power of Human Touch." I once had a very similar episode.
Many Thanks to everything RF for Supporting This Website
RF is a search engine for RF & microwave components.
everything RF lists complete catalogs from various RF & microwave component manufacturers and enables engineers
to search through them by specification. There are over 60,000 components listed from more than 150 Manufacturers. Download
datasheets, request quotes or contact the suppliers for more information via everything RF.
Industries designs and manufactures a wide range of attenuators, RF Switches, Power Dividers, Test Accessories
and systems within an ISO 9001:2008 certified quality system. These products meet or exceed the requirements
of the most demanding applications. All JFW products are designed to the most exacting standards to provide
innovative, high quality and cost effective solutions in a wide variety of global applications. JFW offers
custom designs at catalog prices, fast delivery and no NREs!
Inc. magazine published a few
statistics relating to trends in employee hiring based on polling of employers. The upshot is that personal networking
through current employees has greatly supplanted job websites and headhunters for finding quality employees. Here
are a few of the numbers from hiring companies:
- 50% of have abandoned job boards. - 98% use LinkedIn, 42%
Twitter, 33% Facebook. - 7% of applicants come from referrals but account
for 40% of hires. - 47% 3-year retention of employee referrals, but only
14% from job boards. - $1,200 average referral bonus to employees
Wireless Engineering Crossword Puzzle
a break from the drudgery by trying your hand at some of these goodies. Every word in the
RF Cafe crossword puzzles is specifically
related to engineering, mathematics, and science. There are no generic backfill words like many other puzzles
give you, so you'll never see a clue asking for the name of a movie star or a mountain on the Russia-China border.
Blu-ray Laser Bursts 100 Black Balloons
an old Blu-ray player from which you can cannibalize the laser unit? Scott Stevenson did, and use used it produce
this video. Blu-ray players use a 405 nm (more violet than blue - see thumbnail)
laser diode that emits a 580 nm beam at around 5 mW. I'm guessing black balloons are used because they
absorb more of the light energy and therefore heat faster. A debate on the YouTube page argues between melting
or air heating causing the balloon to burst. My money is on local melting since it would take a long time to heat
the air inside enough to expand enough to cause the popping.
Asian Circuits Added to PCB Vendor Listings
Circuits is a reliable mid to high volume electronic contract manufacturer (ECM) and provider of printed circuit
board (PCB) assembly services with surface-mount (SMT),
through-hole (THT) and mix components. Headquarters is located in Toronto, Canada, and production plants in Shenzhen,
China. Workforce is totally committed to providing clients with excellent service and quality products at a reasonable
Please Visit ISOTEC in Appreciation of Their Support
you know that ISOTEC stands for Iso Technology Corporation? "Since our inception in 1996 in Korea,
ISOTEC has been a leading manufacturer of RF and microwave
connectors such as SMA, MCX, SSMB, and RF components such as attenuators, filters, multiplexers, and terminations,
for wireless service providers." ISOTEC provides recognized and trusted products and services to customers in
more than 30 countries worldwide.
Q-par Angus Limited is Acquired by Solid State plc.
Angus Limited has been acquired 1st May 2013, by Solid State plc, an AIM listed supplier of industrial / ruggedised
computers, specialist electronic components and battery power solutions to the electronics market. Q-par, will
now be known as
Steatite Q-par Antennas, and will remain as one of Europe’s leading microwave engineering experts specialising
in the design and manufacture of ultra-wideband antennas, subsystems, antenna components and consultancy.
Many Thanks to Test Equipment Connection!
Equipment Connection Corporation is your single source
test & measurement solution. "We offer
over 300 test equipment manufacturers including Agilent, Tektronix, Anritsu, Rohde & Schwarz, Advantest and
Fluke, plus thousands of New, Used, Second Hand, and Refurbished test equipment products. We buy and sell bench
top, general-purpose test and measurement equipment. $2,000,000 is budgeted each month for the purchase of surplus
PMI Intros 0.5 to 18 GHz Positive Gain Slope LNA
Model No. PE2-1020-R518-12-SFF
is a low noise amplifier that offers a positive gain slope versus frequency. This type of amplifier is useful
when trying to equalize frequency flatness over a broad bandwidth. This model provides 10 dB of gain at 500 MHz
and 20 dB of gain at 18 GHz. The noise figure is 10 dB at 500 MHz and 9 dB at 18 GHz.
The OP1dB is +14 dBm minimum and the maximum VSWR is 2.5:1.
A Few Job-Related Headlines
Fridays I usually comb the Web for relevant news stories related to engineers and technicians. Here are a few
you might find interesting.
IEEE RFIC Symposium 2013 Next Month in Seattle, Washington!
Bird registration with reduced prices ends on May 6 (Monday). From the brochure: "The
RFIC Symposium brings focus
to the technical accomplishments in the area of integrated RF circuits, systems, and devices. This year's exciting
technical program will showcase the latest innovations with sessions that cover a broad spectrum of topics such
as cellular and wireless-connectivity system ICs, low power transceivers, reconfigurable and digital RF, broadband
wireless communications, silicon millimeter-wave ICs, power amplifier technology, and RF device modeling and characterization."
Electronics Geography Quiz
just doesn't seem all that long ago, buy holy moly that was going on half a century! This
quiz appeared in Popular Electronics to test the hobbyist's knowledge of the whereabouts of some of the major
components and products companies. Many of the businesses have gone defunct, been bought and absorbed by other
companies, or if they do still exist, are in new locations. It will take a real old-timer to score well on this
quiz without resorting to lucky guesses. Still, there are a couple stalwart manufacturers today that even a newcomer
can get right. Good luck.
Tales from the Cube: Debugging with a Laser
from the Cube is an occasional feature published by EDN. It is akin to Sherlock Ohms in that readers submit
the stories. PETA members with a religious level of fervor might want to avoid reading this one titled,
Debugging with a Laser. I'm not ashamed to admit that given the same opportunity, I might have done the
same sort of thing. Here is an especially good line from the story: "An office joke was that
for Latest Angle to Secure Expensive Resources."
Engineering the Integrated Communications System
a follow-on to the "Planning Integrated Signal Communications" story, this article is the next step in the U.S.
Army Signal Corps' implementation of
ubiquitous communications systems. Along with powerful transmitters and super-sensitive receivers at command
communications hubs are the many hand-held, back-pack, and vehicular radios needed to complete strategic and tactical
operations across the face of the Earth. It wasn't just wireless systems that Signal Corps engineers and technicians
were responsible for, but also all the wired equipment and interconnecting cabling. The possibility of software
configuration for network switches, radios, modems, telephones, antennas, and ancillary components had never been
thought of in 1950 (by very few, anyway). Everything was set up with patch panels, jumpers, and hard-wired connections.
That's not to say modern communications...
Solutions, Inc. has introduced a surface mount limiter diode for receiver protection applications. The
CLA4608-085LF is a low capacitance
silicon PIN limiter diode designed for high power applications ranging from 10 MHz to over 6 GHz.
Maximum resistance at 10 mA is 1.2 Ω and maximum capacitance at 38 V is 0.65 pF.
Planning Integrated Signal Communications
U.S. Army's Signal Corps was set up to "exercise supervision over signal communications literally from the
Pentagon to the foxhole." Created in 1860 at the suggestion of a military doctor, the Signal Corps originally
used a system of flag waving for messaging dubbed 'wigwag' and graduated to overseeing the nationwide telegraph
network six years later. By 1870, members were tasked with establishing and operating a weather forecasting service,
so in 1907 when they created an aeronautical division it was just in time for facilitating the nation's rapidly
growing cadre of aircraft pioneers (recall the Wright brothers had flown four years earlier at Kitty Hawk) by
providing en route weather information. Having already mastered the state of the art that was radio and telephone
World's Tiniest Video by IBM "A Boy and His Atom"
from IBM have produced the world's smallest movie, made by a stop-action photography type method. 242 individual
still frames created and acquired by an in-house scanning tunneling microscope were used to create "A
Boy and His Atom." Guinness World Records has certified it as a record-setter (although I cannot find it on
their website yet). From the IBM press release: "A Boy and His Atom" depicts a character named Atom who befriends
a single atom and goes on a playful journey that includes dancing, playing catch and bouncing on a trampoline.
Set to a playful musical track, the movie represents a unique way to convey science outside the research community.
'Capturing, positioning and shaping atoms to create an original motion picture on the atomic-level...
AWR Kicks off ADF 2013 This July in Asia
Corporation, the innovation leader in high-frequency EDA software, today announced the start of its
AWR Design Forum 2013 tour with a diverse schedule
of dates and venues in the Asia Pacific region starting this summer. ADF is an open event at which designers
of microwave and RF circuits and systems such as MMIC, RF PCB, and LTE can network and share useful information
and resources pertinent to high-frequency design, discuss AWR products.
Time to Buy a New Book?
to Antenna Analysis Using EM Simulators, by Hiroaki Kogure, Yoshie Kogure, and James C. Rautio. Written
for novice engineers and engineering students, this easy-to-comprehend resource offers readers thorough introductory-level
treatment of antenna analysis using electromagnetic (EM) simulators. This richly-illustrated book shows how to
use EM software to analyze and tune wireless antennas to meet specific requirements. Readers learn important wireless
antenna design terminology and gain a detailed understanding of how antennas work. Moreover, the book offers guidance
in troubleshooting problems with wireless antenna designs. This authoritative reference also provides a complete
overview of the many different kinds of antennas and related EM tools. DVD is included! This title contains Sonnet
electromagnetics analysis software, featuring example files that are described and illustrated in the book.
Sherlock Ohms: Car Radio Fires up Check Engine Light
Ohms' mysteries are submitted by their readers. They tell stories of electronics posers and how the e-sleuths
solve them. I only link to ones that RF Cafe visitors might enjoy. This installment proves that the old adage
"ground is ground the world around" is only valid when it has a good connection.
A Disruptive Web Presence™
Over 10,000 pages indexed! (none duped or pirated)
RF Cafe Webmaster: Kirt Blattenberger