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
Microwave Corporation (AMC) uses a state-of-the-art clean room to manufacture all of it's products, as well as
a fully automated machine shop. AMC is a leader in the design and manufacturing of
DC to 40 GHz solid state control components
for commercial and military grades. Products include PIN diode switches, PIN diode attenuators, detector log video
amps (DLVAs), tunnel diode amps, wideband detectors, power dividers & couplers, and bias "Ts."
The Amazing Surface Barrier Transistor
to the Transistor Museum website, "The Philco
Barrier Transistor(SBT) was the 'hottest' transistor around until the late 1950s.
This device performed very well at high frequencies and was used extensively in radio and computer circuits. Hobbyists
were delighted to find such an inexpensive high frequency device... [Edwin] Bohr authored many well-remembered
transistor construction projects in the 1950s/60s." Many of Bohr's construction articles featuring SBTs were published
in Radio Electronics magazine, and this was one of them from 1957. The manufacturing process is described
where jet streams of an electrolyte were shot at both sides of the germanium crystal to etch it as required -
Neanderthal in nature compared to today's...
Gratefulness to RFIC Solutions for Continued Support
visit RFIC Solutions in appreciation of their helping to deliver RF Cafe. RFIC Solutions offers
RFIC/MMIC, Analog, Mixed-Signal, 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.
High Performance Combo for VSAT, PtP & Radar Markets
Microwave Corporation, the world class supplier of complete MMIC based solutions for communication & military
markets, has announced a new GaAs pHEMT MMIC power amplifier and an analog variable gain amplifier that are ideal
for Ka-band VSAT, high capacity microwave radio and radar systems in the 27.5 to 31GHz frequency
range. The HMC7441 is a three-stage
GaAs pHEMT Power Amplifier
which operates between 27.5 and 31GHz. The amplifier provides 23dB of gain and +34dBm
of saturated output power at 25% PAE from a 6V supply and output IP3 of +38dBm.
RF/Microwave Copywriter and Content Manager Needed
Enterprises is searching for a talented
Copywriter with RF/Microwave knowledge and industry experience to develop and maintain an extensive range
of information for the Company. Writing projects will be varied and challenging including the development of content
for the Company’s website landing pages, product descriptions, marketing-related emails, press releases and news
pages as well as copy for technical reference materials such as white papers and glossaries. Our successful candidate
will become an integral part of our professional team of RF engineers and marketers. This position requires strong
technical and product knowledge...
Scatter System to Link NATO Nations
Headquarters Allied Powers Europe" - is that a cool sounding title or what? As an aficionado of World War II
movies and paraphernalia, such terms bring to mind a consortium of countries and countrymen desperately working
and sacrificing together to fend off ruthless aggressors to preserve their cherished ways of life. The North Atlantic
Treaty Organization (NATO) was formed in 1949, just a few years after the end of
WWII in order to formalize an agreement to basically cover each other's butts. To attack any one member was to
attack all members, thereby reducing the chance of onslaught. Part of the strategy included developing and implementing
what would be the most
radio communications in existence at the time. Because of the great distances that needed to be covered, both
over-the-horizon tropospheric forward scatter and line-of-sight radio relay links were essential...
Hittite Expands GaN MMIC Product Line
Microwave Corporation, the world class supplier of complete MMIC based solutions for communication & military
markets, announced a new Gallium Nitride (GaN) MMIC power amplifier product which
offers significant performance, size and durability advantages for communications, test instrumentation and radar
systems operating in the 6 to 18 GHz frequency range. The
HMC7149 is a 10 W GaN MMIC Power Amplifier
which operates between 6 and 18 GHz. The amplifier typically provides 20 dB of small signal gain, +40
dBm of saturated output power.
Newsletter from Anatech Electronic
Electronics has published its November 2013 newsletter. As always, it includes both company news and some tidbits
about relevant industry events, regulations, and standards. This month Sam Benzacar offers his takes on the subjects
of analog voltage-tuned filters, legacy products,
reverse microwaves, high-tech feature phones.
Thanks to ACS for Long-Time Support!
Computational Sciences has been supporting RF Cafe since 2008. ACS designs, develops and sells
Electronic Design Automation(EDA) software tools for RF and microwave engineering applications. ACS's main product
is the LINC2
linear circuit simulator and RF Tools products. Visual System Architect provides a block diagram level
system simulator, and AMP Pro simplifies amplifier design. Bundles on multiple packages are available. All
products run under Windows.
Wristwatch Oscilloscope Kickstarter Project
watches stopped being a sign of nerd chic a long time ago. If your wrist has been crying out for a device that
declares to the world, "I am a hopeless technophile... and proud of it!," then this
wearable o-scope-in-a-watch might be just the fashion statement
revolution you have been waiting for. For a $99 pledge, you can receive one of the first prototype as part of
Gabriel Anzziani's Kickstarter project (hurry - only one left as of this writing).
Per the website, "The Oscilloscope Watch has all the features of a modern watch (time, calendar,
alarm, etc...) combined with all the features of the popular
Xprotolab(Oscilloscope, Waveform Generator, Logic Analyzer, Protocol Sniffer, Frequency Counter).
The $60k goal has been met and exceeded. Its open source code...
Test Equipment Connection Continues Support
has been helping deliver RF Cafe since 2009. "Test 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, 2nd 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
Delco's All-Transistor Auto Radio
1957, only a top-of-the-line automobile deserved a radio containing 13 discrete transistors and four crystal diodes.
Only buyers of such a top-of-the-line vehicle could afford the luxury offered by an electronic marvel that promised
instant-on music with superior sensitivity and selectivity over the vacuum tube models that lesser humans endured.
Model 7268085 was up to the task as it populated the dashboards of Cadillac's Eldorado Brougham. Modern day
radios use a single IC (e.g., NXP SAA7706H) for performing all reception, filtering,
amplification, and tuning functions, with superior performance compared to the Delco without all the interstage
tuning transformers, Rs, Ls, and Cs. Most of the rest of the circuitry in your car radio is for microprocessor
control of the user interface and that single RFIC.
AWR Showcases Latest Software at MWE 2013
Corporation, the innovation leader in high-frequency EDA Software, will be exhibiting in Booth A505 at the 2013
Microwave Workshops and Exhibition from November 27 to 29 in Yokohama, Japan. Software demonstrations of the AWR
Design Environment™ will inform and educate attendees about key features and applications. AWR will participate
in the MWE Workshop #08
on Verification of Accuracy for Electromagnetic Simulators for Canonical Problems on November 28th. AWR will present
"Introduction to Analyst, AWR's 3D FEM EM Simulator," on November 29th.
Many Thanks to Linx Technologies!
has been helping to deliver RF Cafe since 2008. Linx Technologies'
remote controls, evaluation
kits and master development systems feature straightforward hardware configuration and clear documentation, making
it simple for engineers and hobbyists to integrate wireless features without the hassle and expense of engineering
RF functionality from scratch. We also offer design services including board layout assistance, programming, certification
advice and packaging design.
New Twitter and LinkedIn Buttons - Please Test
just added Twitter and LinkedIn buttons to RF Cafe in the horizontal bar underneath
the top menu area. By clicking on them, you activate your account and can automatically send the page URL to your
followers. If possible, I would appreciate your trying one or both buttons to make sure they are working properly.
For some reason they do not seem to be incrementing even though I have sent out multiple Tweets and LinkedIn messages
when new items are posted on the homepage (like this one). Each web page is supposed
to have its own unique, independent set of counters, so maybe also try at least one page other than the homepage.
Thanks for your help!
is another of the
Sticklers challenges from Popular Electronics(see May
Sticklers). These are fairly basic circuit analysis problems that often can be solved by inspection,
but sometimes a pencil and paper are necessary. Re-drawing the circuit in a different configuration to make the
connections more obvious often helps when solving total resistance, capacitance, inductance, etc., as in question
#1. In this case, though, you need to be able to recognize a common configuration to be able to simplify the circuit;
otherwise, you'll be writing and solving mesh equations. #2 has a simple answer and a more elaborate possibility.
#3 and #4 are simple inspection problems.
Electronics for Dummies Featured Book
are if you are reading this, you don't really need
Electronics for Dummies. However, Christmas is coming and you might considering picking up a copy to
gift to a tech-challenged friend or boss, or maybe to a relative, that always gets the tell-tale deer-in-the-headlights
stare whenever you start explaining what you do for a living or hobby. The "for Dummies" series is well-known
for helping to make complex concepts understandable for laymen.
Please Visit BRL Test in Appreciation of Support
Test, Inc. is a leading dealer of new and reconditioned test
and measurement equipment. We buy, sell, rent, lease, repair and calibrate all types of general purpose test
and measurement equipment. BRL Test is your one stop source for over fifty different manufacturers and thousands
of different models – specializing in Agilent, HP, Tektronix, Fluke, Anritsu, and Rohde & Schwarz. All equipment
is calibrated per order at an ISO9001:2000 Registered and A2LA Accredited facility (Z-540 &
17025), so you have the added reassurance you are receiving high quality equipment ready to work right
out of the box.
The Electronics of Fluorescent Lamps
there were CFL light bulbs with complicated electronic circuits for generating the requisite high voltages without
a transformer, there were just the familiar straight fluorescent bulbs that use a simple ballast arrangement and
a built-in switch in the bulb base. As with compact fluorescent (CFL) lights, very
few people understood how they worked. Most knew that the 8-foot-long T-12 bulbs made a really cool implosion
sound when they broke - usually intentionally (by people like me) since the glass
tubes were amazingly tough. I remember many moons ago, between high school and the time I enlisted in the USAF,
while I was an apprentice electrician working on a renovation job at a public school, a co-gofer and I spent weeks
wiring fluorescent fixtures all throughout the building. We worked atop a tall scaffolding that was on wheels,
pulling ourselves around the room by grabbing the suspended ceiling grid. When the foreman wasn't around, we relieved
our utter boredom...
PMI Intros 2 to 18 GHz Active Limiter
Model No. TD-30T-SHS-218-2G4G-PECL is a high speed, LVPECL logic output
designed to operate from 2.0 to 18.0 GHz, but optimized for 2.0 to 4.0 GHz. This detector has a propagation
delay of 15 ns max and has a LVPECL output.±15 Vdc supply, SMA connectors.
Advanced Google Searches
A lot of time can be wasted when performing Internet searches. With tens of thousands of pages likely containing
at least some reference to whatever it is you are looking for, drilling down into data to retrieve relevant web
pages can be difficult or impossible. Fortunately, if you know about a few handy
special search formats, you can increase your likelihood of success
greatly. Here are a few I use quite often. Search terms are not case sensitive, but note that the OR operator
is. You may combine any or all of these special operators as long as the syntax rules are followed. If you don't
want to remember all the special search formats, simply type in "advanced search" to get a search page with all
these options implemented. BTW, one of the best tricks I've discovered...
Eternal Thanks to All Who Have Served !!!
eleventh hour of the eleventh day of the eleventh month - November 11th, at 11:00 am - that is when the armistice
(cease fire) began in 1918, unofficially ending World War I. This Veteran's
Day tribute is by Canadian citizen Terry Kelly. It was written after an experience he had on Veterans Day in 1999.
Terry went blind at an early age, but has excelled as an athlete and a musician. "A
Pittance of Time" is done in the finest Celtic tradition.
Notable Tech Quote
now, there are about a thousand satellites operating in space. Of those, just two were designed to be serviced
in orbit: the Hubble Space Telescope and the International Space Station." -
Benjamin Reed, PM of NASA's Satellite
Servicing Capabilities Office, regarding work in progress to built automated robotic satellite service platforms
for repair and refueling satellites not originally designed to be serviced.
USCG Turns to R&S for Help Analyzing Comms Signals
Coast Guard Office of Contract Operations intends to award a non-competitive sole source purchase order to Rohde &
portable receivers (with options) and
digital decoding software (with options). The statutory authority permitting Other
than Full and Open Competition is 10 U.S.C. 2304(c)(1) as implemented by FAR 6.302-1, Only One Responsible Source
and No Other Supplies or Services Will Satisfy Agency Requirements. Together, the products can be used for capture,
analysis, classification, demodulation and decoding of digital and analog IF signals.
Thanks Again to Apex Wireless for Continued Support!
1985, Apex Wireless has offered consulting, engineering,
and design services focusing on high-performance, cost-optimized products that employ wireless RF transmitters,
receivers, and transceivers. To complement our RF design expertise, we work with local experts in DSP, ultra low
power design, packaging, certification, and manufacturing. Apex Wireless handles the complete design and production
cycle, or any part of it - electrical, mechanical, packaging, sourcing, certification, and management.
Track ESA's Falling Satellite in Real-Time
N2YO website provides real-time mappings of many satellites, including the ESA's
Gravity Field and Steady-State Ocean Circulation Explorer(GOCE) platform, which, as I write this, is deciding whose front lawn to fall onto.
The only thing about the satellite's destiny known for certain is that sometime between Sunday afternoon and Monday
morning, it will come plunging to Earth in a fiery re-entry, hopefully burning up into small enough chunks to
not cause any damage on the ground. If you or anyone you know is hit by a piece of the debris, take comfort in
knowing that you can probably sue your country's government for damages. "Basically, governments are responsible
for their own spacecraft," explained...
RF Engineering Crossword Puzzle for November 10, 2013
week's RF Engineering crossword puzzle
is a bit larger than normal, so you'll need to budget a little more time in the corporate reading room to complete
it. As usual, only words related to engineering, science, mathematics, physics, etc., are used. If you want to
de-throne those folks in management and sale of a know-it-all attitude for being able to complete the 'other'
crosswords that use movie star and fashion designer names, leave a copy of this puzzle in a strategic location
in the men's and women's resting areas.
Q&A on Oscilloscopes
Electric is a name most RF Cafe visitors are probably familiar with as being the maker of high quality analog
multimeters, with the Simpson 260 line being the most famous (it is still manufactured today).
Not as many people, however, know that Simpson also used to make
This article from Popular Electronics was written by a Simpson Electric engineer whose job was, in part, to respond
to questions asked by users. It covers basic operations like how to calibrate the display, adjust
the horizontal time base
and vertical amplitude scales, and how to synchronize the display with the input signal. Some explanation of how
to interpret periodic and pulse type waveforms is provided as well as tips on how to avoid overloading and possibly...
AWR Hosts High Frequency Workshop in Brazil & Argentina
Corporation, the innovation leader in high-frequency EDA Software, is co-hosting with CST and National Instruments
a complimentary series on high-frequency
design, simulation, and test workshops in Brazil and Argentina this month. The workshop brings to South American
designers hands-on insight into the world of simulation for RF and microwave circuits and systems as well as 3D
electromagnetic analysis using AWR and CST software. Attendees will also be introduced to the National Instruments’
PXI platform for RF measurements.
Anatech Intros Directional Coupler & 3 New Filters
Electronics has released new designs for a 800-2500 MHz 10 dB directional coupler, a 728 to 734 MHz
cavity bandpass filter, and a 1710 to 1785 MHz/1805 to 1880 MHz cavity duplexer, and a 2412 MHz
cavity bandpass filter for Wi-Fi Hotspots. All can be ordered directly through their
AMCrf web store.
Career & Job Hunting News & Tips
once a month I scan the Internet for useful articles on career news and tips. Here are a few new ones.
Fornetti personally provided the copy of Conquer Radio Frequency that was
used to create this quiz, and has authorized me to include it in the monthly Book Drawing. His video to the right
provides a great introduction to the book and to the very well-done set of instructional videos featured on the
included DVD. AWR's Microwave Office software is used throughout the tutorials. A live, narrated, step-by-step
process is fully captured on-screen so you see how to create the circuit schematic, set up the component parameters
for simulation and optimization, specify graph and table types and how to designation input files, configure input
stimulus, and how to interpret the results of the simulation. It is an excellent way to familiarize yourself with
where to find everything in MWO's menu and toolbar structure...
The Rice Variarm
oscillators(ECOs) were a real breakthrough in achieving frequency stability
in harsh environments that included mechanical vibration, temperature excursions, power supply variations, and
load changes. Use of vacuum tubes made the task even more challenging. Such oscillators were necessarily very
expensive compared to less sophisticated designs. Henry E. Rice Jr., W9YZH, introduced his "Rice Variarm" model
(aka the Millen Model 90700) at a breakthrough price of just $29.50, which in 2013
money equates to $469.89 per the U.S. BLS
Calculator. That is a lot of moola for amateur radio operators even today. The arm sticking out of the case
is for adjusting the frequency.
Big Data from Your Car
typical new car today generates 15 gigabytes (109)
of information per hour - a number that's climbing as sensors proliferate. A little back-of-the-napkin figuring
suggests that 250 million such vehicles would produce around 2000 exabytes (0.002 yottabyte)
per year, most of which never leave the car. But that's changing." So said Frank Markus in the September 2013
edition of Motor Trend magazine. His article titled, "You Car's Contribution to
the 'Big Data' Cloud," does a nice job in explaining the immense amount of digital data generated by a new
car's computer system. The numbers include everything from tire pressure sensors sending metrics via Bluetooth
to fuel injection and entertainment systems. Smart headlights, auto-dimming rear view mirrors, self-parking algorithms
and gesture sensing make it easy to believe the numbers. Coming soon to a vehicle near you is a personal health
late 1950s and early 1960s were the dawn of the Space Age, beginning unofficially with the launch of Sputnik.
Popular Electronics put a lot of effort into educating the public on advances in
including not just the spaceborne platforms, but also ground tracking and communicating equipment. Much hardware
was launched into orbit in the early years without giving much thought to the hazards or space debris. Failures
in the form of explosions scattered chunks widely, but fortunately most were low enough to have their orbits degrade
and re-enter the atmosphere. One interesting tidbit reported in this article that I didn't know was that the TV
camera lens on the TIROS 2 weather satellite was defocused during launch (due to positional
shifting from vibration and G forces, I suppose) and crippled the image quality severely.
Skyworks Ramps SkyOne™ w/Smartphone Manufacturers
Solutions today announced that HTC and Samsung are ramping
SkyOne™, a highly customizable, fully optimized front-end solution, in several of their recent smartphone
launches. The SkyOne™ platform, which integrates all RF and analog content between the transceiver and antenna,
reduces complexity, size and time-to-market for customers with demanding architectures for advanced mobile applications.
Utilizing Skyworks’ full technology portfolio and advanced multichip module capabilities including proprietary
shielding and packaging, SkyOne™ is the world’s first semiconductor device to condense multiband power amplifiers
and high throw switches along with all associated filtering, duplexing and control functionality into a single,
Solace in Solar
test engineer Joe Cahak, owner of Sunshine Design Engineering Services, recently had a
photovoltaic panel system installed on
his southern California home. After much research and running through return on investment
(RoI) calculations, he made the decision to invest in a state-of-the-art system by
Semper Solaris in San Diego. If you have not looked into modern PV technology, you might be surprised - as was
I - to learn that rather than all the panels feeding their DC outputs into a common AC inverter that handles phasing
issues with the street service, instead each panel has its own inverter and phase matching circuit so everything
simply feeds into a 2-pole circuit breaker. Doing so eliminates single point failures and allows graceful degradation
if necessary rather than taking down the entire system. Joe has provided a very nicely done write-up on the system
and its installation.
DARPA's Advanced RF Mapping (RadioMap) Program
project is underway by Defense Advanced Research Projects Agency (DARPA) to provide
a real-time map (RadioMap) of where over-the-air broadcasts
are occurring. The idea is to create a Google Maps type graphical interface where a network of 'sensors' that
includes special purpose and otherwise deployed devices will report to a central data collection point to provide
situational awareness for where and when (and by whom in some cases) specific frequencies
are being occupied. Proposals are being accepted for companies wanting to contribute to the program, so this might
be a great opportunity for makers of software defined radios (SDR) to build functionality
into systems for accommodating such detection and reporting...
Linx's RM Series GPS Receiver for Economical Solutions
Technologies announces its launch of the high performance, low cost
Positioning System receiver modules. Using the built-in MediaTek MT3337 chipset, The RM module can simultaneously
acquire on 66 channels and track on up to 22 channels, providing standard NMEA data messages through a UART interface.
A simple serial command set can be used to configure optional features. The RM receiver module is a cost-effective
GPS solution. It offers no-frills, basic operation in a compact 15 mm by 13 mm package.
Portable Digital O-Scope RF Cafe Featured Product
this is not a phone or GPS device. It is a handheld digital oscilloscope (DSO) with a 1 MHz bandwidth, 2.8"
color LCD, max sample rate of 1 Msps with 12 bits of resolution, and a USB interface
(not needed for operation). For a mere $70 you get the
DSO201 and a test probe. For $162 you can get a 4-channel version (DSO203)
with a 72 MHz analog bandwidth. Here is a
YouTube video demonstrating both o-scopes'
Electronic Speed Mail
mail did not start out as we know it today, whereby anyone with access to an Internet-connected device can compose
and send a typed message to a similarly equipped receiver. The first electronic mail message was sent
(and received) on November 1, 1960, between post offices in Washington, D.C., and
Chicago, Illinois. This article from Popular Electronics takes you on a step-by-step tour of how the
Mail system worked, including its dedicated shortwave radio links between participating cities. Great care
was taken in an attempt to assure message confidentiality by having the letter opened and scanned automatically
inside a sealed machine on the transmit end and then printed and placed in a sealed envelope on the receive end.
Knowing what we know now about government snooping, you have to wonder if a copy of each message was routed...
16 Corps Control Nearly All You Buy, Read, or Watch
RF Cafe visitor sent me a link to an article showing how most of what we buy at a grocery store is under the auspices
of a mere 16 conglomerates. It
is amazing - and scary - just how much corporate consolidation has occurred in the last couple decades. News reports
mention all the bankruptcies, buyouts, and mergers throughout each year, but unless you are paying attention to
such matters, it is easy to not notice what is happening. Did you know, for instance, that Pepsico owns and therefore
controls among other companies Kentucky Fried Chicken and Pizza Hut, Aunt Jemima and Cap'n Crunch, Doritos and
Ruffles, Dole and even - believe it or not - Pepsi. Proctor & Gamble owns Mr. Clean and Bounty, Tide and Ivory,
Cover Girl and Olay, Charmin and Old Spice. Kraft controls Ritz and Planters, Jell-O and Cool Whip, Dr. Pepper
and Sunkist, Certs and Chiclets, Oscar Meyer and Honey Maid. The list goes on and on...
RF Technician / Test Engineering Opportunity
opportunity is open to either new EE/EET electronics graduates, experienced RF / wireless technicians with 1 year
min experience seeking a full or part time job, or current EE/EET students seeking a paid internship or a part
time / co-op job. The
and general engineering technician will work primarily in product test where RF amplifiers are tested and
tuned prior to shipment. No experience is necessary and all training will be provided, however, it is necessary
that the applicant be proficient in basic electrical concepts and circuits. In addition to RF test the job involves
assisting design engineering with parts purchases, light electronic assembly (prototyping)
and engineering documentation and database update tasks.
Please Visit ISOTEC in Appreciation of Their Support
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. ISOTEC is ISO9000 and ISO14000 certified factory.
Tales from the Cube: "The Big Breaker Mistake"
of us have heard tell of people sticking a penny in a screw-in
glass fuse holder slot in an old fuse panel when either a replacement fuse is not available or when the correct
amperage fuse keeps blowing. Neither reason is acceptable under any conditions, but the latter reason to avoid
replacing a fuse that keeps blowing is especially stupid. Fuses blow and circuit breakers trip usually because
something is wrong and needs attention. This installation of EDN's "Tales from the Cube" feature shows
how truly stupid people can thwart virtually any measure of safety when it comes to electricity.
Notable Tech Quote
is born a genius, but the process of living de-geniuses them." "I'm not a genius. I'm just a tremendous bundle
of experience." - R. Buckminster Fuller
This Is Not the Internet
appeared in the November 2013 edition of The Good Life,
a local newspaper of northern Michigan. Each monthly edition is chock full of not just news and advertisements,
but also scores of jokes and riddles. "Okay, I'm five-foot-three and pleasingly plump. Recently, after I had a
minor accident, my mother accompanied me to the emergency room. The ER nurse asked for my height and weight, and
I responded in a serious tone, 'Five-foot-eight, 125 pounds.' While the nurse pondered this information, my mother...
Bonus riddle: How do the guys in a close-knit group of technology refer to each other?
Wireless Engineering Crossword for 11/3/2013
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 Radio Physics Course: Resistances in Radio
heard of 'Litz' wire, right? It's the twisted bundle of multiple enamel or otherwise coated wire used for
making couplers, antennas, and at frequencies up to about a couple MHz. Congratulations, but did you know
the full name for it is 'Litzendraht?'
Neither did I until after reading this article. 'Litzendraht' is the German word meaning 'braided wire' or 'woven
wire.' Litz by itself means braided or woven. So, technically if you call it Litzendraht wire, you are being redundant
since it is the same as saying woven wire wire. That might save you some embarrassment one day if you happen to
be working around a German techie. Litzendraht is used in order to exploit the skin effect at high frequencies
where the majority of the current is conducted on the wire's surface. Using multiple insulated wires enables greater
current carrying capability than an equivalent diameter single solid wire. While dispensing trivia, note also
the use of the term 'B. & S.' gauge for wire...
A Disruptive Web Presence™
Over 10,000 pages indexed! (none duped or pirated)
RF Cafe Webmaster:
Kirt Blattenberger KB3UON