See Page 1 |
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archives.
Thursday the 14th
How We Fight with Words
Prior to the turn of the century, mobile
communications consisted mainly of Citizens Band (CB) radio and Amateur (Ham) radio.
Limited range and sometime crowded channels on CB meant contacting fellow "good
buddies" was a shot in the dark. Hams signals could go much farther distances, but
the number of available contacts was much more limited. People living in Communist
countries were often nearly impossible to reach because their oppressive governments
prohibited even receiving foreign "propaganda" signals - under threat of imprisonment
and/or fines (like where even today the Nazi state of Virginia prohibits the reception
of police radar gun transmissions). Accordingly, the U.S. government used extreme
measures to broadcast messages of Western world freedom (which we are losing rapidly)
to the oppressed masses. This "How We Fight with Words" article from a 1952 issue
of Popular Science magazine discusses some of the methods employed, including some
darn large antenna arrays...
Microchips Take on Fake Foods and Drugs
"Labels on your grocery store products might
say 'Spanish extra-virgin olive oil' or 'New Zealand grass-fed beef,' but these
are just words. How can such broad claims ever be verified? Food fraud - things
like additives, dilutions, mislabeling, and substitution - affects over 1% of the
global food industry, according to studies cited by the U.S. Food and Drug Administration,
and can cost as much as $40 billion a year. To fight counterfeits, some food makers
are turning to chips, not of the edible kind. Makers of authentic Parmigiano-Reggiano
cheese in Italy are putting
silicon chips smaller than
a grain of sand and priced at a few cents apiece on their cheese wheels. The
microchips made by Chicago-based p-Chip use blockchain technology to trace products
all the way from growers to grocery shelves..."
Radio Telemechanics
Once again, electronics and overall tech
visionary Hugo Gernsback, editor at the time of Radio-Craft magazine, prognosticated
in the 1930s what was then a pipe dream but what is today commonplace -
remote control of multi-functioned apparati (sic) via secure wireless digital
communications. Adolph Hitler had risen to power a year earlier and was a precursor
to what would officially become World War II. By 1937, nations were thinking
about what kinds of technologies would be necessary should the little mustachioed
dictator decide to invade his neighbors' countries in an attempt to rule over the
Earth. That this was so is apparent in many magazine articles in the decade of the
1930s: The Saturday Evening Post, Life, Popular Mechanics, and
even Good Housekeeping...
Optical SpecAn Sheds
Light on Fiber-Optic Cables
Axiom Test Equipment, an electronic test
equipment rental and sales company has published a new blog post entitled "Optical
Spectrum Analyzers Shed Light on Fiber-Optic Cables" that covers the process
of evaluating the performance of fiber-optic cables by picking the proper optical
spectrum analyzer for the job. Numerous test equipment provides insights into fiber-optic
cable quality, but one of the handiest and most versatile for the task is the optical
spectrum analyzer (OSA). For the best results, fiber-optic cables should be measured
before installation and tested as part of a regular maintenance schedule. An OSA
measures and displays the distribution of light across a single wavelength or wavelength
range. It can be used to explore how environmental effects, such as temperature,
impact fiber-optic cable performance within its range, and how physical effects,
such as bending or looping of cable, can affect performance. Evaluating the performance
of fiber-optic cables requires a unit such as an OSA with the wavelength range to
cover the bands and wavelengths used within any applications of interest...
Ultrasonic Frequency Spectrum
The
ultrasonic frequency
spectrum refers to a range of sound frequencies that are above the upper limit
of human hearing, which is typically considered to be around 20,000 hertz (Hz).
Ultrasonic frequencies start above this threshold and extend into the megahertz
(MHz) range. Ultrasonic waves are characterized by their high frequency and short
wavelength compared to audible sound waves. Ultrasonic frequencies generally start
at around 20,000 Hz (20 kHz) and can extend up to several gigahertz (GHz). The specific
range considered "ultrasonic" can vary depending on the context and application.
Ultrasonic waves have much shorter wavelengths than audible sound waves. This property
allows them to be used for precise measurements and imaging, as they can interact
with small objects and features. Ultrasonic waves can be transmitted through various
media, including air, water, and solids...
Get Your Custom-Designed RF Cafe
Gear!
This assortment of custom-designed themes
by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins,
Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's
Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart."
My "Matchmaker's" design has been ripped off by other people and used on their products,
so please be sure to purchase only official RF Cafe gear. My markup is only a paltry
50¢ per item - Cafe Press gets the rest of your purchase price. These would make
excellent gifts for husbands, wives, kids, significant others, and for handing out
at company events or as rewards for excellent service. It's a great way to help
support RF Cafe. Thanks...
Many Thanks to Anatech Electronics
for Long-Time Support!
Anatech Electronics (AEI) manufactures and
supplies RF and microwave filters for military and commercial communication
systems, providing standard LP, HP, BP, BS, notch, diplexer, and custom RF filters,
and RF products. Standard RF filter and cable assembly products are published in
our website database for ease of procurement. Custom RF filters designs are used
when a standard cannot be found, or the requirements dictate a custom approach for
your military and commercial communications needs. Sam Benzacar's monthly newsletters
address contemporary wireless subjects. Please visit Anatech today to see how they
can help your project succeed.
Wednesday the 13th
Anaconda Copper
Anaconda Copper was a major mining company
that operated in the United States during the late 19th and early 20th centuries.
It was known for its extensive mining operations in Montana, particularly in the
Butte-Anaconda mining district. Anaconda Copper was founded in 1881 in Anaconda,
Montana, by Marcus Daly, a copper magnate (as opposed to a magnet, which copper
isn't, unless an electric current is running through it). The company quickly grew
to become one of the largest copper producers in the world. The Butte-Anaconda area
was rich in copper, silver, and other minerals, and became known as "The Richest
Hill on Earth" due to the enormous copper deposits found there. Anaconda Copper
faced economic challenges over the years, including fluctuations in copper prices
and increased environmental regulations. Anaconda provided defense and civilian
companies with the majority of their copper. World War II was long over by
1950 when this advertisement appeared in The Saturday Evening Post magazine, but
many raw materials companies continued promoting to the public through such efforts...
PILOTing Through the Magnetosphere
"Not
so long ago (2022), Advanced Space collaborated with a team of science and engineering
organizations to help design a science mission to study the effects of the biggest
space weather maker in the solar system: the Sun. The mission concept, called
Plasma Imaging, LOcal measurement, and Tomographic experiment (PILOT), is designed
to measure the flow of cold, dense plasma into and out of Earth's magnetosphere
to better understand how the interaction between Sun and Earth's planetary magnetic
field defines the evolution of our planetary atmosphere. To measure these flows
in real time requires a fleet of 34 satellites revolving around the Earth in two
different orbits to capture plasma movement at different spatial and temporal scales.
Advanced Space's role was to help design the orbits for the 34 spacecraft as they
performed..."
Miniature Lamp Drawings & Specifications
Traditional
incandescent miniature lamps
(bulbs) are described by a letter indicating shape and a number that is an approximation
of diameter expressed in eighths of an inch. For example, B-4 is "B" shape, 4 eighths
or one half inch in diameter. Profile sketches of the most popular glass domes and
metal bases are provided for visual identification, and they are also useful in
engineering drawings. These bulb types are found mostly in equipment manufactured
prior to the early 2000s, because they have been replaced with more energy efficient
and longer lasting white LEDs (which are actually blue LEDs with a phosphor coating
to obtain a wide spectral content). Sources such as Digi-Key and Amazon still carry
most of these bulbs, both incandescent and LED equivalents...
We know, many times you want to just buy
your RF assemblies to plug in to your circular
D38999 connector or your VITA67 module. Well now ConductRF offers multiple solutions
for both styles of Multi-Port connector all available on short lead times based
on our on hand materials stock. D38999 integrates BMA, SMPM & SMPS connectors,
also other #8, #12 & #16 coax contact solutions. VITA67.1/2 uses SMPM solutions,
but the new VITA67.3 also offers SMPS and NanoRF to support your coax. These are
100% factory tested to exacting VSWR and Loss standards because, We know, Results
Count. Many ConductRF cables are available off-the-shelf from Digi-Key...
Electronics-Themed Comics
Mellow out a tad with these four electronics-themed
comics from a 1970 issue of Radio-Electronics magazine. As mentioned before,
radio and television technology was a big deal in the era. People hadn't been born
into a world of transistorized microcircuit media devices that perform nearly every
conceivable function - phone, TV, radio, computer, heart rate monitor, voice recorder,
remote control, camera, compass, game, social media, etc., etc., etc. Unlike today's
electronics products that typically don't break with normal use and do not require
periodic alignment, folks from my demographic were used to turning on a TV or radio
and having to readjust it or have it repaired. These comics reflect that time in
history. Of course artist Marvin Townsend adds humor to the situation. I got a good
laugh at the ones on pages 16 and 22...
RF & Electronics Symbols
for Office™
It was a lot of work, but I finally finished
a version of the "RF & Electronics Schematic & Block Diagram Symbols"" that
works well with Microsoft Office™ programs Word™, Excel™, and Power Point™. This
is an equivalent of the extensive set of amplifier, mixer, filter, switch, connector,
waveguide, digital, analog, antenna, and other commonly used symbols for system
block diagrams and schematics created for Visio™. Each of the 1,000 or so symbols
was exported individually from Visio in the EMF file format, then imported into
Word on a Drawing Canvas. The EMF format allows an image to be scaled up or down
without becoming pixelated, so all the shapes can be resized in a document and still
look good. The imported symbols can also be UnGrouped into their original constituent
parts for editing. Check them out!
Many Thanks to Centric RF for Their Continued
Support!
Centric RF is a company offering from stock
various RF and
Microwave coaxial components, including attenuators, adapters, cable assemblies,
terminations, power dividers, and more. We believe in offering high performance
parts from stock at a reasonable cost. Frequency ranges of 0-110 GHz at power
levels from 0.5-500 watts are available off the shelf. We have >500,000 RF and
Microwave passive components we can ship you today! We offer Quality Precision Parts,
Competitive Pricing, Easy Shopping, Fast Delivery. We're happy to provide custom
parts, such as custom cables and adapters, to fit your needs. Centric RF is currently
seeking distributors, so please contact us if interested. Visit Centric RF today.
Tuesday the 12th
Apollo TV Uses SEC Tube
The recording and
transmission of color video today is accomplished entirely with semiconductor
sensors and digital circuitry. Yes, light levels are analog by nature (although
some would argue they are quantized, hence not truly analog), but the sensor cells
are addressed and read digitally. The data is then put into a digital video transmission
standard format for distribution either by cable or over the air. In the early days
of color television, a handful of system standards competed for universal acceptance
(see list of articles at bottom of page). Some were electromechanical and others
were totally electronic. One of the electromechanical schemes involved a rotating
segmented color wheel (red, green, and blue glass) in front of the vidicon tube
and assembling the detected light levels into a serial video train of analog signals
(aka composite video). Each segment of the signal has a set duration, so the receiver
knows how to decode the composite video timing and route the signals (both audio
and video) to the appropriate circuits and mechanisms. This setup allows a black
and white (B&W) camera to send color images. Believe it or not, the video cameras
deployed with Apollo 10 and Apollo 11 were of the color wheel type...
Rare Earth-less Motors
Lots
of brilliant people out there. "Advanced electric motors can help give tomorrow's
electric vehicles more range and performance while reducing or eliminating the need
for
rare-earth minerals found in the permanent-magnet synchronous motors (PMSMs)
that have been widely used until now. Part 1 of this series explored several wound-rotor
synchronous motor (WRSM) architectures and how they can be near-drop-in replacements
for PMSM units. Part 2 examined the properties and application challenges of switched
reluctance motors (SRMs), one of the most common types of so-called induction machines.
Part 3 looks at synchronous reluctance motors (SynRMs), another promising sub-species
of induction-type machines. As with the other installments, we will introduce their
operating principles, advantages, and disadvantages, as well as what it will take
to turn them into a practical technology for powering next-generation EVs..."
Kirchhoff's Voltage & Current Laws
The concepts of
Kirchhoff's Current
Law and Kirchhoff's Voltage Law follow. Both assume a totally contained system
where energy is conserved.
Kirchhoff's Current
Law (aka Kirchhoff's 1st Law) is one of the fundamental principles in electrical
circuit theory. It's named after Gustav Kirchhoff, a German physicist who formulated
this law in the mid-19th century. KCL is used to analyze and describe the behavior
of electric currents at junction points within electrical circuits. The statement
of Kirchhoff's Current Law is as follows: "At any junction (or node) in an electrical
circuit, the sum of the currents entering the junction is equal to the sum of the
currents leaving the junction." In other words, when you consider a point in a circuit
where multiple conductors or wires meet (a node), the algebraic sum of the currents
flowing into that node is always equal to the algebraic sum of the currents flowing
out of that node. This law is based on the principle of conservation of electric
charge, which means that no electric charge is lost or created at a junction; it
simply flows in and out. Σ (incoming currents) = Σ (outgoing currents)...
RF & Electronics
Stencils for Visio
With more than 1000
custom-built stencils, this has got to be the most comprehensive set of
Visio Stencils available for RF, analog, and digital system and schematic
drawings! Every stencil symbol has been built to fit proportionally on the included
A-, B-, and C-size drawing page templates (or use your own page if preferred). Components
are provided for system block diagrams, conceptual drawings, schematics, test equipment,
racks (EIA 19", ETSI 21"), and more. Test equipment and racks are built at a 1:1
scale so that measurements can be made directly using Visio built-in dimensioning
objects. Page templates are provided with a preset scale (changeable) for a good
presentation that can incorporate all provided symbols...
Thanks to Copper Mountain Technologies
for Continued Support
Copper Mountain Technologies develops innovative
and robust RF test and measurement solutions for engineers all over the world. Copper
Mountain's extensive line of unique form factor
Vector
Network Analyzers include an RF measurement module and a software application
which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware
via USB interface. The result is a lower cost, faster, more effective test process
that fits into the modern workspace in lab, production, field and secure testing
environments. 50 Ω and 75 Ω models are available, along with
a full line of precision calibration and connector adaptors.
Monday the 11th
Philco Has Opened "U.S. Television Highway 1"
In 1945, when this "Philco Has Opened 'U.S.
Television Highway 1'" infomercial appeared in Life magazine, the
Dwight D. Eisenhower National System of Interstate and Defense Highways had not
yet begun to be constructed. Dwight was busy wrapping up his 5-star general duties
at the end of World War II. It was not until 1956, during his term as the 34th
American president, that work commenced on build the nationwide network of transportation
routes that is credited with helping to establish the country as the world's most
powerful nation both economically and militarily. Producing copious amounts of goods
and services doesn't do much good if they cannot be moved efficiently and effectively
to where they are needed. U.S. Highway 1 was notable for providing a multilane,
high speed thoroughfare up and down the entire east coast - from Key West, FL, to
Fort Kent, ME. I write all that to give perspective to how Philco saw their developing
of a
microwave relay system as being akin to Highway 1 (aka Route 1) for
its technological equivalent for efficiently and effectively transporting electronic
information across great distances...
TotalTemp C900 Benchtop
Temperature Chamber
TotalTemp Technologies, a worldwide leading
provider of research laboratory and production temperature chambers and thermal
platform equipment, introduces their model
C900 Benchtop Temperature Chamber. Also known as an environmental test chamber,
the C900 performs thermal tests through the use of forced air convection. Internal
capacity is 9 cubic feet (225 cubic liters). Employing a temperature controller
sensing the air temperature with a setpoint of the desired temperature, temperature
stability at various points can be achieved. Heat is removed by directly injecting
cryogenic liquid into the chamber or heat is added by resistance heaters in the
airstream. Features include caster stand or benchtop, left or right hinge doors,
tandard duty or heavy duty shelf, redundant valve failsafe systems...
Can Dry Cells Be Recharged?
As one who has been dealing with using and
recharging batteries - both individual cells and wired packs - for about five decades,
I have used many varieties of chargers and battery chemistries. As you probably
know, there are two basic types of cells:
primary and secondary. Based on their construction and chemistry, the former
are not designed to be recharged while the latter are. Primary cells include zinc-carbon
and standard alkaline. Secondary cells include nickel-cadmium (NiCd), nickel-metal-hydride
(NiMH), and lithium polymer (Li-Po). Rechargeable batteries can have their discharge
cycle reversed by running an externally supplied current through the cell in the
opposite direction. Of course there are optimal conditions by which that current
must be fed in order to preserve the cell's properties (peak voltage, charge storing
capacity, discharge current, internal resistance, current leakage, etc.) and lifetime.
There have been many occasions where I put primary batteries in a charger for a
few hours in order to squeeze a little more use out of them. In all the years, I
have never had one explode, catch fire, overheat, leak...
Electrical Charge Unit Conversions
Electric charge is a fundamental property
of matter that describes the intrinsic electrical property of particles such as
electrons and protons. It is one of the key concepts in physics and plays a fundamental
role in understanding the behavior of matter and the interactions between particles.
There are two types of electric charge: positive and negative. Protons are positively
charged, while electrons are negatively charged. Positive charges repel each other,
and negative charges repel each other, but positive and negative charges attract
each other. The principle of conservation of electric charge states that the total
electric charge in a closed system remains constant. In other words, electric charge
cannot be created or destroyed, only transferred from one object to another. Electric
charge is quantized, meaning it comes in discrete, indivisible units. The elementary
charge (e) is the charge of a single proton or electron and is approximately equal
to 1.602E-19 coulombs...
September 11, 2001 - Never Forget
Incredibly, 22 years have passed since the extremist
Islamic attack on American soil on the morning of
September 11, 2001. Nearly 3,000 citizens died that day. World
leaders have embarked on a path of colonizing our homelands with groups of people
that are known to harbor sympathies for the terrorists. They dwell among us now
and mean to do us harm when opportunity presents itself - which it has on numerous
occasions in the past many years. Never forget the people who died in the burning
towers, the Pentagon, and the airplanes, and those left behind to grieve and get
on with life. Never forget the police and military members who fought - and some
died - to keep us safe and free. Never forget the rotten politicians who imperil
our existence with their selfish agendas.
Promote Your Company on RF Cafe
Banner Ads are rotated in all locations
on the page! RF Cafe typically receives 8,000-15,000 visits each
weekday. RF Cafe
is a favorite of engineers, technicians, hobbyists, and students all over the world.
With more than 17,000 pages in the Google search index, RF Cafe returns in
favorable positions on many types of key searches, both for text and images.
Your 728x90-px and 160x600-px Banner Ads are displayed on average 225,000 times
per year! New content is added on a daily basis, which keeps the major search
engines interested enough to spider it multiple times each day. Items added on the
homepage often can be found in a Google search within a few hours of being posted. If you need your company news to
be seen, RF Cafe is the place to be...
Thanks Once Again to everythingRF for
Long-Time Support!
Please take a few moments to visit the
everythingRF website to see how they can assist
you with your project. everythingRF is a product discovery platform for RF and microwave
products and services. They currently have 267,269 products from more than 1397
companies across 314 categories in their database and enable engineers to search
for them using their customized parametric search tool. Amplifiers, test equipment,
power couplers and dividers, coaxial connectors, waveguide, antennas, filters, mixers,
power supplies, and everything else. Please visit everythingRF today to see how
they can help you.
Sunday the 10th
Electronics Theme Crossword for September 10th
This custom RF Cafe
electronics-themed crossword puzzle for September 10th contains words and clues
which pertain exclusively to the subjects of electronics, science, physics, mechanics,
engineering, power distribution, astronomy, chemistry, etc. Given that today is
the 10th day of the month, many words in this crossword start or end (or contain)
the 10th letter, "J." If you do see names of people or places, they are intimately
related to the aforementioned areas of study. As always, you will find no references
to numbnut movie stars or fashion designers. Need more crossword RF Cafe puzzles?
A list at the bottom of the page links to hundreds of them dating back to the year
2000. Enjoy...
Get Your Custom-Designed RF Cafe
Gear!
This assortment of custom-designed themes
by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins,
Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's
Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart."
My "Matchmaker's" design has been ripped off by other people and used on their products,
so please be sure to purchase only official RF Cafe gear. My markup is only a paltry
50¢ per item - Cafe Press gets the rest of your purchase price. These would make
excellent gifts for husbands, wives, kids, significant others, and for handing out
at company events or as rewards for excellent service. It's a great way to help
support RF Cafe. Thanks...
Thanks to PCB Directory for Continued
Support!
The leading website for the PCB industry.
PCB Directory is the largest directory of
Printed Circuit Board (PCB)
Manufacturers, Assembly houses, and Design Services on the Internet. We have listed
the leading printed circuit board manufacturers around the world and made them searchable
by their capabilities - Number of laminates used, Board thicknesses supported, Number
of layers supported, Types of substrates (FR-4, Rogers, flexible, rigid), Geographical
location (U.S., China), kinds of services (manufacturing, fabrication, assembly,
prototype), and more. Fast turn-around on quotations for PCB fabrication and assembly.
Friday the 8th
Fairchild Semiconductor - Dual Inline Package
Maybe at one time I knew this, but the claim
by Fairchild Semiconductor in this 1965 Electronics magazine advertisement
took me by surprise. They claim to have invented the
dual-inline-package (DIP) format. According to Wikipedia, a trio of chaps -
Don Forbes, Rex Rice and Bryant Rogers - all Fairchild engineers, developed the
DIP package in 1964, a year prior to the ad. Previously, a round can designated
TO# (Transistor Outline) with # (number) leads around the perimeter was used for
integrated circuits, but as the I/O pin count increased, that form factor became
unwieldy. An extensive search for a patent on the DIP, assigned to Fairchild and/or
the three inventors, did not turn up anything. I did find this one for "Lead frame
design," which is for a TO-220 type outline...
Robots to Maintain World's Only Giant Radiotelescope
"Robots will soon be deployed to carry out
maintenance work at China's
giant radio telescope, state media reported, holding out hope for eliminating
the potential hazards posed by human repair workers. Five intelligent robots, capable
of automatically performing tasks without human instruction, have passed inspection
for maintenance work at the Five-hundred-metre Aperture Spherical radio Telescope
(FAST), Xinhua reported late last month. Located in China's southern Guizhou province,
FAST is the world's largest single-dish radio telescope. It is now also the world's
only giant radio telescope, after the collapse of Puerto Rico's Arecibo Observatory
telescope in 2020. The Arecibo collapse shocked many worldwide, but for those in
charge of maintaining the 305-metre-wide instrument, alarming signs including poor
maintenance..."
Thévénin's Theorem
Thévénin's Theorem is a fundamental concept
in electrical engineering that simplifies complex linear electrical networks into
simpler, equivalent circuits. It's named after the French engineer Léon Charles
Thévénin, who formulated the theorem. Thévénin's Theorem is particularly useful
for analyzing and solving circuits with multiple components and sources. The theorem
states that any linear electrical network with multiple sources and resistive elements
can be replaced by a single voltage source (Thévénin voltage) in series with a single
resistor (Thévénin resistance). This simplified equivalent circuit is called the
Thévénin equivalent circuit. Here are the key components of the Thévénin equivalent
circuit: Thévénin Voltage (Vth): The Thévénin voltage (Vth)
is the open-circuit voltage measured across the two terminals of interest in the
original circuit after all the independent voltage sources have been replaced with
short circuits and all the independent current sources have been replaced with open
circuits. In other words, Vth is the voltage you would measure between
the two terminals when no load is connected. Thévénin Resistance (Rth):
The Thévénin resistance (Rth) is the equivalent resistance measured across
the same two terminals in the original circuit...
Idiots from My USAF Tech School Days
Here is an old RF Cafe Forums post from
November 21, 2005, I ran across today, and thought you might enjoy the flashback
of
Idiots from My USAF Tech School Days. It begins: "For some reason while retrieving
change from a vending machine today, I was reminded of a story from my Air Force
tech school days - two of them. Story #1 actually involved a vending machine. The
barracks at Keesler AFB, MS, had three floors and, oddly enough, the only floor
with vending machines was the one at ground level. The soda machine was notorious
for taking your dollar bill or quarters and not giving back any change. Wise airmen
quickly learned to use exact change. But, there were always new people coming into
the barracks, so the vending machine operator always had a fresh batch of suckers
for their machine. At least that's what I though, too, until one day I observed
some guy slamming the machine after it ate his change. After he left, I figured
I'd try shaking the machine a while to see if I could get his change. No luck. However,
I went up to my room and got a clothes hangar and poked an end up into the change
slot. I found a wad of napkins crammed up in there. When I dug them out, voila,
about $5 in change fell onto the floor. Some scumbag had been collecting his fellow
servicemen's money for who knows how long. After I spread the word, he must have
figured we were on to him and didn't do it any more. Never did find out who it was..."
RF & Electronics Symbols
for Office™
It was a lot of work, but I finally finished
a version of the "RF & Electronics Schematic & Block Diagram Symbols"" that
works well with Microsoft Office™ programs Word™, Excel™, and Power Point™. This
is an equivalent of the extensive set of amplifier, mixer, filter, switch, connector,
waveguide, digital, analog, antenna, and other commonly used symbols for system
block diagrams and schematics created for Visio™. Each of the 1,000 or so symbols
was exported individually from Visio in the EMF file format, then imported into
Word on a Drawing Canvas. The EMF format allows an image to be scaled up or down
without becoming pixelated, so all the shapes can be resized in a document and still
look good. The imported symbols can also be UnGrouped into their original constituent
parts for editing. Check them out!
Please Thank RF & Connector
Technology for Their Support
Providing full solution service is our motto,
not just selling goods. RF & Connector Technology has persistently pursued a management
policy stressing quality assurance system and technological advancement. From your
very first contact, you will be supported by competent RF specialists; all of them
have several years of field experience in this industry allowing them to suggest
a fundamental solution and troubleshooting approach. Coaxial RF connectors, cable
assemblies, antennas, terminations, attenuators, couplers, dividers, and more. Practically,
we put priority on process inspection at each step of workflow as well as during
final inspection in order to actualize "Zero Defects."
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.
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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a lady's voice announced "You've Got Mail"
when a new message arrived...
Copyright 1996 - 2026
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.