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 "Search
RF Cafe" box at the top of every page.
About RF Cafe.
Appreciation of Their Support
everything 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 126,356 components listed from more than 342 manufacturers. Download datasheets, Request
quotes or contact the Suppliers for more information via everything RF. Its fast & easy!
What is capable of putting out more power, a solid
state amplifier or a vacuum tube amplifier? The simple answer is that given a large enough array of power combiners, a solid
state power amplifier can theoretically put out as much power as a tube amp, but the complexity is much, much greater. A
single vacuum tube can output RF power levels in the megawatt range, but even the highest power GaN semiconductor devices
do not reach the kilowatt realm. That is the reason there are still so many vacuum tube transmitters - the tubes themselves
- still being produced today. Equivalent size solid state transmitters are generally much larger...
for Continued Support!
Noisecom has been a leading
provider of RF & microwave noise generating equipment used in commercial
& military applications since 1985. We
provide noise diodes, calibrated noise sources, jitter sources, cryogenic
noise standards, and computer controlled instruments for either Precision C/N, or broad band white Gaussian noise. Noise
Com provides off the shelf as well as custom designed noise testing solutions.
Artech House and Cambridge University Press
have generously donated many engineering books to RF
Cafe over the years. They are often used as the basis of my RF Cafe Quizzes,
and then are made available to monthly RF Cafe Book Drawing winners for selection. More than a hundred books have been given
away since the feature began, and I have always paid the shipping and handling costs. In an effort to reduce the rather
large collection of books on-hand, I am going to offer, for the month of April, to make them available for only the cost
of shipping and a small packaging and handling fee. For a flat fee of a mere...
"R2-D2" - Walter urch, sound designer for the film
American Graffiti. That's film lingo for "reel two, dialog two," and is what Mr. Murch had
said to producer George Lucas during the editing process. Lucas was also in the process of writing the script for
Star Wars and needed a name for his robot. Seen in the November 2013 edition of
Smithsonian magazine (p 81).
By late 1962, the U.S. was
new satellites at a very rapid pace. Many were destroyed on the launch pad, others never turned on once in orbit, still
more turned on and operated in a crippled form and/or only for a small portion of their intended lifespans. It was a learning
period for the entire satellite, rocket, mission control, Earth-based tracking stations, and the communications equipment
that dialoged with the satellites. The "race" part of the Space Race moniker was literal. Popular Electronics,
QST, Electronics World, and other electronics communications publications regularly printed a list of
newly commissioned satellites. The lists presented here came from five different 1962-1963 editions of Popular Electronics.
The feature was repeated for many years. Incidentally, the "mc" frequency unit used at the time...
Puzzle for March 31, 2014
This week's custom-made
engineering crossword puzzle has the
name of the WWW's most popular high tech website integrated among the matrix's words. As always, every word and clue is
related to science, engineering, physics, mathematics, etc., as pulled from a custom dictionary of words and clues that
has been over a decade in the making. Let me know if you would like to have your company's or school's name included in
a future puzzle.
for Supporting RF Cafe
Boonton Electronics is
recognized as a leader in high-performance test instrumentation and sensors. They are a manufacturer of test equipment dedicated
measuring the power of RF and microwave systems used in both military and commercial
sectors. The company also manufactures modulation
analyzers, impedance measuring instruments, RF voltmeters and audio analyzers.
Smart People Will "Get"
Take a break from the work day drudgery and cogitate
on some of these high tech zingers. Some juxtapose
a riddle and a joke to form a clever quip. To wit (get it - to 'wit'?): • There's a band
called 1023MB. They haven't had any gigs yet. • A photon checks into a hotel and the bellhop asks him if he has any
luggage. The photon replies 'No I'm traveling light.'" • What is a physicist's favorite food???
crossword puzzles has been shown to be a simple activity that can help prevent or at least stave off some forms of mental
atrophy. It is a medical fact that as you grow old and/or cease presenting yourself on a regular basis with mental and physical
challenges, your brain actually begins to lose gray matter and synapse interconnections are lost. Working crossword puzzles
is a healthy mental exercise that helps increase your vocabulary and improve cognitive skills. That is one reason I create
a weekly crossword puzzle for RF Cafe visitors. Electronics magazines of the last century regularly published
theme-based crosswords, like this one from a 1960 edition of Electronics World.
Light and Wireless Speaker
"AirBulb: When there is Light, there is Music."
That is the tag line for a Kickstarter product that is seeking investor funding to bring to market their combination LED
light bulb and speaker. An app is used on your smartphone, tablet, or any device with Bluetooth to stream stereo audio to
the AirBulb, and it also adjusts the LED light spectrum and intensity. AirBulb is already designed and tested, so the money
is mainly needed for expensive production tooling. Officially: "What is AirBulb? AirBulb combines LED bulb and wireless
speaker together at an affordable price. Integrated with Bluetooth technology, you can play music or control the lighting...
for Ongoing Support
leading wireless electronics companies have relied on 3Gmetalworx to deliver cutting edge solutions for advanced
RF/EMI PCB-level shielding requirements.
From prototyping and design services to JIT manufacturing supply, our clients depend on us to provide a seamless
service pathway supporting entire product lifecycle. All our shields can incorporate engagement tabs, trace / component
relief, tuning / access openings, and thermal relief.
Some of the earliest television display schemes were mechanically
scanned light projection systems rather than electronically raster scanned cathode ray tubes. This 1930 vintage article
from Radio News magazine reports on a scheme developed by Arthur Watson whereby a specially formed rotating Monel
disk served as the rotating reflecting surface to produce the light scanning action. This invention was hailed as a breakthrough
that would finally make commercial TV available to the masses. "Mechanical televisions"
worked by transmitting scanned images of the original subject in the form of amplitude modulated electrical signals whose
voltage was determined by the level of reflected light. A synchronizing signal...
Rentals' How-To Videos
The good folks at Advanced Test Equipment Rentals have put together
a pretty darn nice collection of How-To videos
for some of the equipment that they make available. Examples are "How to Use Anritsu MT9083A Optical Time Domain Reflector
(OTDR)," "How to Use a Kaelus iPA Passive Intermodulation (PIM)
Tester," and "How to use Fluke 435 II Power Analyzer." Even if you don't plan to use the exact manufacturer and model, these
videos are still useful for tips. Operations manager Martin Jahn also has a short video where he...
EMI/RFI Shielding Products
Orbel, a leading manufacturer of etched and stamped EMI / RFI shielding, recently introduced its 2014 catalog. With more
than 1,000 designs and ideas to choose from, expert designers are on staff for support and to satisfy your custom design
needs. Orbel is able to meet your demands for board level shielding, finger-stock, gaskets, metalized fabric gaskets, photo-etched
precision metal parts, precision metal stampings, and electroplated
Use of the Apostrophe
How would you pluralize VCO, BJT,
or SAW? My awareness of certain often seen grammatical errors in both technical and non-technical media is heightened by
the large numbers of technical articles I read, so certain errors tend to stand out. Some of the errors are likely made
out of uncertainness and/or an unwillingness to challenge de facto (yet still incorrect) standards.
Capitalization in titles is one area of flagrant abuse, where capitalizing all words, capitalizing the first letter of every
word, capitalizing the first letter of only the first...
MPN-14 Photos at Minot AFB
Former USAF radar technician Elbert Cook, who last
year sent photos of a scale model he was building of the
MPN-14 ASR/PAR radar system, has submitted
photos of when the 3rd Combat Communication Group (aka 3CCG or 3rd MOB) sent one of its systems
to Minot AFB, ND, for a TPX-42 secondary radar system installation. The TPX-42 is the unit that interrogates an aircraft's
transponder to paint the familiar 3-digit octal IFF (Identification Friend or Foe) code on
the PPI (Plan Position Indicator) display for ATC (Air Traffic Control)
use. The purpose of the photos is to show how improvisation...
This story from a 1963 edition of Popular
Electronics proves that my ongoing effort to point out that the sometimes harmless, sometimes harmful tensions between
engineers and technicians is not a recent development. I have told of my own witnessing of
engineer vs. technician pi**ing contests stretching back into the early 1980s during my first job as an
electronics technician at Westinghouse Electric. Rather than joining the fray, I appreciated the abilities of engineers
to provide, typically but with some exceptions, a good combination of academic and real-world experience. Being a technician
myself at the time...
Electronics Curves Quiz will probably prove to be a little more of a challenge than some of the ones previously
appearing in Popular Electronics magazine. Being a rocket scientist won't help you much here, but being a seasoned electronics
technician, hobbyist, or engineer will sure come in handy. Be careful to note the axis unit labels - I got tripped up by
that from being lazy and missed one.
Its March 2014 Newsletter
Anatech Electronics has published its
March 2014 newsletter. As always, it includes both company news and some tidbits about relevant industry events, regulations,
and standards. This month, Sam Benzacar offers his views on the subjects of AT&T's Digital Life service, LightSquared
"Crawling back to life," the challenges of Defense contracting, and IMS2014 in Tampa Bay, Florida.
Capacitors come in a huge variety of package configurations,
chemical makeups, physical constructions and sizes, capacitance values, and voltage and power handling abilities. Each has
its own strengths and weaknesses for a particular application. When capacitors are functioning properly, life is great,
but when one decides to fail either completely or partially,
troubleshooting the cause can be a real challenge. The best kind of electrical component failure from a troubleshooting
perspective is one where the component releases its life-giving internal smoke and in the process leaving a clearly visible
clue like a cracked case or a nice black mark when none should be...
Quotient Rule for Derivatives
It has been a while since I saw the
quotient rule for
derivatives applied. Probably the last time was in a college text book, because I'm pretty sure I haven't had the occasion
to use it since then - except maybe back in the days when I was writing my RF Workbench software and needed to derive closed
form solutions for group delay in filters. This 1933 article from Radio News magazine presented the quotient rule
as part of a discussion for finding the impedance of a load for maximum power transfer. Pure resistances were used in the
example, but the method applies as well to complex impedances.
for Ongoing Support!
AWR, the innovation leader in
high-frequency EDA, provides software solutions that maximize user
the design of high-frequency ICs and communications systems for the aerospace / defense,
semiconductor, computer, consumer electronics, and telecommunications markets. Free Trial Downloads Available.
I do a lot of my purchasing on Amazon for convenience, but also because
that's where I can usually find the best price and shipping is almost always free. They also have a no-hassle return policy
where if the problem is their fault, they pay return shipping; otherwise, you pay only the cost to mail it back. If I need
something that there is a fair chance it will need to returned, I'll buy locally to avoid a potential return shipping cost.
Cellphones are a good example of finding a good price online. This unlocked
Samsung S5830 Galaxy Ace is a good example, as are of course just about any form of electronics, tools,
housewares, and of course movies, books, and software.
Here is a great look inside the planning and
operation of the "Minitrack" systems used for
to track the Sputnik, Echo, Explorer, and other early Earth artificial satellites during the International Geophysical Year
(IGY) activities. "Essentially, the [IBM 704's] storage function works by means of doughnut-shaped cores, about the size
of pinheads, which are strung on a complex of wires in such a way that several wires pass through each core. Combinations
of electrical impulses on these wires alter the magnetic states of the cores. A line of cores, some magnetized and some
neutral, represents a number or other collection of symbols in much the same way...
RF Magazine Articles
The latest batch of new articles have been posted online by magazines such as Microwaves &
RF, EE Times, Microwave Product Digest, etc. Enjoy!
• Managing Output
Transients in RF Signal
Generators, P. Perez-Lara
Change Test Strategy from
Serial to Parallel, P. Scalisi
Bouncing Short Beats Clean
One for Power System
Testing, Glen Chenier
Future of Flexible Electronics
Millimeter Wave Sub-
Assemblies Enable Next
Generation R&D Projects
March 2014 Newsletter
The March 2014 LadyBug Technologies
newsletter is now available. Founded in 2005, LadyBug Technologies manufactures the PowerSensor™ line of miniaturized USB
RF & Microwave Power Sensors. "Our software developers are currently working on Gemini's applications. The product will
offer many new exciting features. One of these new features is "Math Windows"; these are pre-defined windows that can be
opened within the application and can be used to process measurements from two or more sensors
March 24, 2014
"If you think there's no big deal about
those two little letters 'E' and 'X', just ask my wife if she is the same as my ex-wife." - RF Cafe visitor
Mr. Steve Gilbert, in
response to my Day in History item for March 4th. In it, I stated,
"1930: President Calvin Coolidge dedicated the Coolidge Dam on Gila River in AZ." Steve's comment was in regard to my use
of "President" vs. "Ex-President." Technically, it is correct to refer to an ex-president as "President," but I laughed
so hard at his comment that I had to ask for permission to post it.
The Saga Continues
is yet another them-vs.-us scenario regarding
engineers-vs.-technicians. Maybe I misinterpret the author, but a jab definitely seems to be included
in the emphasis put on the technician attempting to score points with his proposal requirement. This otherwise interesting
and instructive anecdote is a bit tainted by shifting at least part of the blame for a hurried research effort off onto
the customer's imposed time schedule. I'm not looking to rag on anyone, but just have seen way too much of the class warfare
in our electronics realm. It certainly exists everywhere.
Crossword Puzzle 3/23/2014
RF & Microwave Engineering Crossword
Puzzle, as do all my crosswords, uses only technical type words pulled from a hand-assembled dictionary that has been
added to for over a decade. You will find no other crossword puzzle like it anywhere on the Internet.
and Their Alignment
was a big year in the commercial broadcast industry because it was when the FCC began licensing stations for
Amazingly, that was only four years after Edwin Armstrong first came up with his frequency modulation scheme - fast moving
for the government. Simultaneously, equipment manufacturers were cranking out transmitters, receivers, antennas
(new frequencies), writing installation and operation guidelines, training servicemen, and
doing scores of other vitally important tasks. The advent of FM was considered a very significant technical improvement
because of immunity to electrical noise interference. If for no other reason, you should look at this article to see the
photo of the megavolt...
100 W Power Dividers
MECA introduces Low Frequency addition to
the H-Series, 100-watt Wilkinson
high power combiner/dividers. Available in 2-way and 4-way configurations covering 5 to 500 MHz. With VSWR of 1.30:1
(Typ) and low insertion loss (less than 0.3 dB) all while accommodating
load VSWR's of 2.0:1 or better! Available in N and SMA connectors. Essential for combining unbalanced inputs! All
models are weatherproof IP 67 rated. Made in USA.
EMI Analyzers for CISPR 16-1-1
Advanced Test Equipment
Rentals, supplier of complete testing solutions for EMC, now carries the latest EMI receiver and analyzers from top manufacturers
Agilent and Rohde & Schwarz, from
20 Hz to 40 GHz, fully compliant to CISPR 16-1-1 with A2LA ISO 17025 calibration certification. The
Agilent N9038A MXE EMI receiver
and the R&S ESU40 are fully CISPR
compliant EMI analyzer. Features like quasi-peak detectors, meters, signal and measurement lists, marker functions, span
zoom, zone span, and spectrogram displays.
Appreciation of Support
Empower RF Systems is a global leader in
and industrial market applications. With our
origins in the design of
broadband and band-specific SSPAs, Empower continues to advance the science of RF power amplification to produce the toughest,
most efficient and cost-effective solutions in the industry. Our priority is to design and deliver high quality, innovative
products which solve customer systems and business requirements.
Bring Down Patent Trolls
This article by Bob
Ambrogi, of IMS Expert Services, reports
on three particular cases making their way through the U.S. court system and the U.S. Congress might
finally be the death knell for the
patent trolls' despised practice. "A patent troll, also called a patent assertion entity, is a person
or company who enforces patent rights against accused infringers in an attempt to collect licensing fees, but does not manufacture
products or supply services based upon the patents in question, thus engaging in economic rent-seeking. Related, less pejorative
terms include patent holding company and...
Added to My Radar Shop List
USAF Radar technician
Jerry Wright just checked in with his service info. He spent
5 years at Tinker AFB in Oklahoma working on the TPN-19 ground-based mobile airport surveillance radar (ASR) and precision
approach radar (PAR). New photos have been offered, so check back later to see them.
Here is this week's batch of useful career enhancement
articles that I found on the Web. Some apply specifically to technical job, while others are good advice for any professional.
Engineering Fields That
Best and Worst Words to
Use in Your Resume
Looking for a Green Tech
Job? Move to One of These
Who Needs to Know How
Bangalore Tech Firms Urging
Employees to Be
to Talk to Your Boss
Your Career Goals
Synergy Microwave, a privately
owned and operated U.S. company, has been designing and manufacturing passive and active
RF and microwave components, including filters, mixers, VCOs, power dividers,
phase comparators and shifters, DC blocks, attenuators, x-formers, and more since 1983. With more than 30 patents, we are
constantly striving to serve this industry by providing products that exploit all modern technologies and methods, while
also supporting installed bases of equipment.
Thanks to Copper Mountain Technologies
(CMT) for continued support! CMT makes affordable, lab-quality
vector network analyzers that provide high accuracy, wide
dynamic range, a familiar UI and a broad
variety of standard features.
Operating with an external PC via USB, these VNAs increase productivity and lower costs for test, control, and design applications.
the Defense Program
The National Radio Institute
(NRI) was one of the first country-wide organizations to offer
formal electronics training both as classroom and as self-study courses. Magazines were filled with offers
to train men in what was an exciting new career field. The drums of war were beating in the background by December 1940
when this article appeared, and the U.S. military was gearing up for what was sure to be an eventuality. Three months earlier,
the Tripartite Pact united Japan, Italy and Germany to formalize the Axis Powers, and Hitler's forces had invaded Western
In this August 1963 adventure, teenage techno-investigators
Carl and Jerry use their home-brew sonar device to help the local sheriff nab a couple bank robbers. The 'Hydro Probe' mentioned in the article was a real product manufactured by the Raymond Development Company
of Watertown, Massachusetts (no longer in business). Enjoy.
Representatives for Nevada
LadyBug Technologies, manufacturers of patented
no-zero no-cal before use USB RF Power Sensors, is pleased to announce new
representatives for the state of Nevada.
Northern Nevada is served by Jay Stone
Associates and Southern Nevada is represented by ACETEC, Inc. Both
firms are established LadyBug partner representatives with extensive experience in RF and microwave technology.
Upgrade Kit #4395U-010
Dr. G.W. Ko wrote in search of anyone that has
an HP/Agilent Software Upgrade Kit #4395U-010
for sale. This option allows the capability of impedance measurement function for the
4395A is a network / spectrum
/ impedance analyzer. HP/Agilent no longer offers the upgrade for sale. If you have or know of a source for purchasing the
4395U-010 upgrade kit, please send me an e-mail at
RF Cafe and I will pass it along to Dr. Ko.
visitors are amongst the most intelligent and most clever folks on the World Wide Web. I receive many e-mails, and an occasional
phone call, from people in response to items I post on the website. Whenever appropriate, I ask permission to use it for
content, with an offer to give full credit and attribution for the idea. I have been surprised at how often the person prefers
to keep the communications private, which I always honor. That's too bad because, believe me, you have missed out on some
really good insider information over the years. Yesterday...
In the 1960s, most people believed that poetry
ought to rhyme. It was not uncommon to see poems appear in magazines of all sorts including even technical publications
like Popular Electronics. "More 'Tower' to You" is a good example. Nobody ever claimed that these
reader-submitted on-subject poems were of Nobel Prize quality, but many were extremely clever and were almost sure to
elicit the chuckle their authors intended; that is to say, they were humorous. What made them humorous is what is true of
nearly all good humor - it contains an element of truth.
Equipment for Their Support!
is a trusted source providing sales, rentals and leasing of refurbished
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. With Alliance Test, you can recover 30%-40% more
on your idle test equipment rather than selling to a dealer.
Copper Mountain Technologies
Copper Mountain Technologies, an industry leader in USB-based, lab-quality vector network
analyzers, has announced a career opportunity for a National Sales Manager. Qualifications include understanding VNA test
methodology and product strategy, possessing in-depth product expertise to conduct customer demonstration, trials, and providing
pre-sales technical support to sales channels, and providing technical and commercial support for on-going projects. Must
understand local RF market, establish relationships within the industry
Soldering Iron Station
Maybe it's time
you had your own
ESD-Safe Digital Soldering Iron Station. Whether you do your soldering at home, at work, or at both
places, having to tolerate a piece of junk soldering iron can be not only annoying, and can cause irreparable damage to
both components (heat, mechanical, and ESD) and circuits boards (layer delamination and metal trace separation). Really
nice programmable soldering stations are available today at surprisingly low prices. Many models are available, but this
one even includes a fluorescent work lamp. It gets great reviews - just $90 including free shipping. Don't wait for your
company to finally supply you with a good soldering station when you can buy one for the cost of a month of cellphone service.
of Coaxial Connectors
You have probably
seen some pretty atrocious
coaxial cable connector installations. You might have even been responsible for a few of them. It could
be tempting, at least for frequencies in the lower megahertz range, to allow yourself to be a little sloppy with coaxial
cable preparation and connector attachment, but doing so can result in marginal functionality if power levels are high or
if power levels are very low. When voltage levels are high, excessive air gaps between the inner and outer conductors can
result in arcs, and poor connections can generate intermodulation products high enough to cause interference
(possibly subjecting you to a violation citation...
Solutions for Mobile Devices
Skyworks Solutions today unveiled several
wireless networking products
incorporating flip-chip packaging, augmenting its existing world-class mobile connectivity portfolio. Skyworks' newest devices
leverage innovative and proprietary manufacturing techniques that allow smartphone and tablet OEMs to incorporate smaller,
thinner solutions for 802.11ac system-in-package (SiP) modules. As high-end mobile devices deliver ever-increasing functionality
and ubiquitous connectivity
New Magazine Articles
The latest batch of new articles have been posted online by magazines such as Microwave
Journal, High Frequency Electronics, etc. Here they are for your career edification.
- Tips for Transitioning
Designs to Manufacturing,
Modulation: PAM-4, NRZ,
or ENRZ?, Martin Rowe
Quasi-Optical Techniques for
Properties in the THz
Region, J. Martens,
J. Hesler, and A. Arsenovic
The Impact of Power
Characteristics in Cognitive
Radio Networks, G. Watkins,
Beware of the Square Root,
"There's no doubt who was a
leader in space after the Apollo Program. Nobody came close to us. And our education system, in science, technology, engineering,
and math, was at the top of the world. It's no longer there. We're descending rather rapidly." --
Buzz Aldrin, former NASA astronaut
and second person to walk on the moon (Source: Wikipedia) Buzz is one of my all-time favorite astronauts, and is the namesake
of Toy Story's
Rentals March 2014 Newsletter
Advanced Test Equipment Rentals just issued
their TEC Talk newsletter for March 2014. It includes hot topics in the tech news world, highlights of new or special function
test equipment they have available, and some electronics industry news.
Crossword for 3/16/2014
a break and work this week's science &
engineering themed crossword puzzle. All the words are pulled from a hand-built list of terms, names, and abbreviations
that have only to do with science, mathematics, and engineering. If you want a crossword with names of movie stars and obscure
countries, try the local newspaper. If you want to exercise your nerd knowledge, this is the one for you.