See Page 1 |
2 |
3 |
4 | of the June 2023 homepage archives.
Wednesday the 21st
You might recognize the name Phillip H.
Smith. He was an engineer at the Radio Development Department of Bell Telephone
Laboratories. This January 1939 issue of Electronics magazine might be
the first publication of what is now the most recognized form of his famous Smith
Chart. Here, Mr. Smith describes the motivation behind his new chart and the
process used to create it. Being a humble man (a presumption), he titled his invention
the "Transmission
Line Calculator," rather than naming it after himself. The Smith Chart enjoyed
wide acceptance fairly quickly by those who understood how and why it worked. Analog
Devices now owns the copyright to the Smith Chart; however, the company must not
guard their ownership of its likeness too jealously since many thousands - probably
hundreds of thousand or millions - of instances appear everywhere in print, online,
and in software. Maybe some rambunctious lawyer will someday convince Analog Devices
to collect royalties. If you hear of it in the works, be sure to buy ADI stock...
"By all that is holy in ham radio, I was
able to copy several CQ's de their calls and a few words!" That sentence in Mrs.
Wayland M. Groves' 1934 QST magazine story caused me to do some searching
because I do not recall having seen "de" used like that. As it turns out, according
to AC6V's Origin of Ham Speak webpage (about 10% down on page), "de" is borrowed
from the preposition "de" in the French language. It is a connotation of ownership,
as in "un ami de ma mère," meaning "my mother's friend" (my interpretation, subject
to correction). Topics dealing with women in Ham radio typically deal either with
attracting them to the hobby through participation or appeal to their accommodating
nature to facilitate a mate's indulgence. Both perspectives usually make for interesting
and often comical tales...
Axiom Test Equipment, a leading provider
of test equipment solutions, is proud to announce the launch of its newly redesigned
mobile website (screen capture on Galaxy S7 shown to the right). The enhanced
site aims to provide customers with a clean aesthetic and user-friendly experience,
allowing them to easily navigate and find the test equipment they need. With the
increased demand for on-the-go accessibility, Axiom Test Equipment recognized the
importance of optimizing their website for mobile devices. The redesigned mobile
website offers a responsive and intuitive interface, ensuring that customers can
effortlessly browse and explore the extensive range of test equipment, anytime and
anywhere. The key features of the newly launched mobile website include: Enhanced
Navigation: The streamlined navigation menu allows users to browse through categories,
narrow down their equipment options, and search for specific products with ease.
The improved layout ensures a smooth and efficient experience for customers seeking
the ideal test equipment....
Shipboard radio operators have been a crucial
part of commercial and military transport since first being implemented in the early
20th century.
Marconi Wireless Telegraph Company's operators (John "Jack" Phillips and Harold
Bride) onboard the RMS Titanic are credited for saving the ship after it ran into
an iceberg in the north Atlantic, as are the radio operators aboard the RMS Lusitania
after German U-boats mercilessly torpedoed it. Today's sailing vessels, as well
as aircraft, are as reliant upon skillful radio operators and radio equipment as
back then. Much has been automated, but ultimately it is the human element in the
communications chain that determine the fate of the mission...
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...
LadyBug Technologies was founded in 2004
by two microwave engineers with a passion for quality microwave test instrumentation.
Our employees offer many years experience in the design and manufacture of the worlds
best vector network analyzers, spectrum analyzers, power meters and associated components.
The management team has additional experience in optical power testing, military
radar and a variety of programming environments including LabVIEW, VEE and other
languages often used in programmatic systems. Extensive experience in a broad spectrum
of demanding measurement applications. You can be assured that our Power Sensors
are designed, built, tested and calibrated without compromise.
Tuesday the 20th
As were the majority of
electronics-related comics from the 1950s and 1960s, this set of four from a
1963 issue of Radio-Electronics magazine had themes related to home entertainment
devices (radios, television, and stereos) and computers. Keep in mind that almost
all equipment used vacuum tubes rather than semiconductors. There was no such thing
as a home / personal computer then, either. The public was dealing with the introduction
and integration of computers into everyday life, so they (computers) were subject
to ridicule and criticism - legitimately. Those were the days where programs consisted
of cardboard "punched cards" that were placed in a stack into the computer, which
would "read" the presence or absence of rectangular holes as "0"s or "1"s. Most
used an 12 row by 80 column format, accommodating 80 words of 6 or 8 bits
each. Southern Senior High School, from which I graduated in 1976, had a small computer
which used punched cards...
The
attack on
hydrogen-based energy has begun. The declared demon here is not its combustion
byproducts - H2O and O2 - but H leakage (think
train derailment
a la Ohio). Investors in other Green Energy sectors must be getting nervous
about advances in the technology. "The global warming effect of leaked hydrogen
is almost
12 times stronger than CO2, shows a new study by CICERO, a climate
research center, published in Communications Earth & Environment. The
study fills a gap in our knowledge about the climate effects of hydrogen, a central
technology in the energy transition. Unlike exhaust from burning coal and gas that
contains CO2, burning hydrogen emits only water vapor and oxygen. Rather,
it is the leaking of hydrogen from production, transportation and usage that adds
to global warming. Hydrogen is not a greenhouse gas, but its chemical reactions
in the atmosphere affect greenhouse gases like methane, ozone, and stratospheric
water vapor. In this way, emissions of hydrogen can cause global warming, despite
its lack of direct radiative properties..."
Lotus Communication Systems began in 2009,
setting up CNC machine shop and RF/microwave assembling and testing lab in Middlesex
Country, Massachusetts. Lotus is committed to highest quality and innovative products.
Each RF/microwave module meets
exceedingly high standards of quality, performance and excellent value, and are
100% Made in the USA. Lotus' RF/microwave products cover frequency band up to 67
GHz. Lotus also offers an COTS shield enclosures for RF/microwave prototyping and
production. All products are custom designed. We will find a solution and save your
time and cost. Lotus has multiple 4 axis CNC machines and LPKF circuit plotters.
In stock, 1-day free shipping.
The lesson learnt - or learned - by Barney
in this
Mac's Radio Service Shop saga is one that he has learned - or learnt - before,
if you are a regular reader of the feature. As always, the story is a combination
docudrama and tutorial concerned with troubleshooting, handling customers, giving
air to some newfangled device, or instruction on circuit theory. Proprietor Mac
McGregor is usually the teacher and technician Barney the pupil, but on rare occasion
the roles are reversed. As you will see in this episode, radio and television set
designers ginned up all kinds of ways to accomplish the same end objective - avoiding
patent infringements or exercising personal creativity - and the nuances between
them could cause no end of frustration to even highly trained and experienced troubleshooters.
An additional inconvenience set upon technicians working on vacuum tube equipment
was needing to wait for the tubes to warm up to determine whether the intended "fix"
actually did the job. That was in addition to having to avoid getting nailed by
lethally high voltages both when the set was powered up and for a short while afterward
while the high voltage supplies drained their stored charges...
"New design for a
foldable phased-array transmitter can help make satellites lightweight, smaller,
and cost-efficient to launch, report scientists at Tokyo Tech. The transmitter is
made of stacked layers of liquid crystal polymer and incorporates flexible creases,
which provide flexibility and deployability. The new design could make research
and implementation of space technologies more accessible to private companies and
startups. There has been a recent shift in the space industry towards what is now
called the 'new-space era.' The term refers to how space is no longer dominated
exclusively by government agencies such as NASA but has instead become a playground
for many private companies and startups interested in exploring and deploying space
technologies. While this opens up a vast ocean of possibilities for space research,
exploration, and telecommunications, launching satellites remains an expensive endeavor.
In general, low earth orbit (LEO) satellites are both low cost and low latency..."
"Compactness distinguishes the Western Electric
8A airplane receiver." That statement describes a 160-pound system that included
a wind-driven electricity generator for the equipment used by Captain Frank M. Hawks
when setting coast-to-coast time records in the year 1929 using his Lockheed Air
Express airplane, dubbed "Texaco 5." A simple
4-tube AM radio, its chassis measured a whopping 6" x 10" x 12". There were
no radio direction finding stations enroute at the time, so the radio's usefulness
was limited to being "comforting to listen in every half-hour and be advised of
general conditions throughout the United States." Daring pilots of the day risked
life and limb to push forward the frontiers of technology by testing and proving
airframes, engines, electronics, navigation methods, and, almost as importantly,
building confidence and a sense of awe and urgency on the part of the public so
that continued development would be assured and encouraged...
New Scheme rotates
all Banners in all locations on the page! RF Cafe typically receives 8,000-15,000
website 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. 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.
KR Electronics has been designing and manufacturing
custom filters for military and commercial radio, radar, medical, and communications
since 1973. KR Electronics' line of filters includes lowpass, highpass, bandpass,
bandstop, equalizer, duplexer, diplexer, and individually synthesized filters for
special applications - both commercial and military. State of the art computer synthesis,
analysis and test methods are used to meet the most challenging specifications.
All common connector types and package form factors are available. Please visit
their website today to see how they might be of assistance. Products are designed
and manufactured in the USA.
Monday the 19th
Careful what you wish for, because you might
just get it. We almost got it here in the U.S., a year or so ago in the form of
Nina Jankowicz, aka "Scary Poppins," based on the bazaar video she posted. She was
the candidate for ordination into the top post of a proposed new "Disinformation
Governance Board (DGB)," akin to George Orwell's Ministry of Truth. Fortunately,
reaction to her nutty past quickly nixed not just her, but the DGB. Technology visionary
Hugo Gernsback, in this 1964 issue of his Radio-Electronics magazine, lamented
the growing amount of bad science getting passed off as good science because there
was not some central vetting agency to separate the figurative wheat from the chaff.
With the encroaching Marxism occurring worldwide these days, I wonder whether Mr. Gernsback
would still make this claim: "A
National Facts Center must be built and operated by the Federal Government."
Based on his record of championing private industry and academia - at least in its
state of being in his day - I doubt it. I will point out, though, that 1984
was published in 1949...
Finding the equation for the inductance
of a standard
tightly-wound, single-layer inductor is very easy. What, though, if you needed
to determine how to build an iron-core inductor or to build a choke coil with a
silicon steel laminated transformer-iron core where the windings have an air gap
between them? Who ya gonna call? Alfred Ghirardi, of course, or at least his ghost
through this article from a 1934 edition of Radio News and the Short-Wave
magazine. If you also need advice - complete with drawings - on how to wind a coil
that will not induce a killer counter-EMF when a switch is opened (as with a solenoid),
then here, too, is your source...
pSemi® Corporation, a Murata company leading
in the design and development of semiconductor integration, today announced two
multi-chip modules featuring dual-channel switches, the PE53230 for 3.3-3.8 GHz
and the PE53231 for 3.5-4.0 GHz. Each module contains
two switches and two LNAs for high and low band frequencies. The new module
portfolio delivers the lowest noise figure in the industry, at less than 1 dB,
enabling best-in-class receiver sensitivity and performance while handling 20 W
average input power enabling removal of external circuitry. Built for applications
across wireless infrastructure including TDD-LTE macro and micro cells, 5G massive
MIMO systems and TDD-based communication systems, the new modules feature high gain
and gain flatness. They can function as a failsafe with unexpected high-power signals
coming in from Tx, while improving receiver channel sensitivity with low noise figures.
Combining high linearity (IIP3) with low power consumption, the new modules are
highly integrated solutions...
The schematic and parts list for the
Wards Airline model 74BR-1055A portable radio appeared in the August 1947 issue
of Radio News magazine. Electronics trade magazines often published this information
for the benefit of hobbyists and even professional service shops who could not afford
to buy official versions from the manufacturers or places like Sams Photofacts.
Companies like RCA, Motorola, Airline, Delco, Westinghouse, General Electric, Admiral,
etc., typically only provided service documentation to licensed sales and service
establishments. Airline was the brand of radios and TVs sold by Montgomery Ward,
just as Silvertone was the brand name of radios sold by Sears, Roebuck, & Co.
Since there are still instances of these old radios around, as evidenced by this
Airline model 74BR-1055A now listed on eBay, making schematics and parts lists -
and sometimes even alignment and troubleshooting data - is useful to someone. Note
the unusual mounting of the electronics chassis upside-down at the top of the case.
I wonder if that configuration caused heat dissipation...
RF Cascade Workbook is the next phase in the evolution of
RF Cafe's long-running series, RF Cascade Workbook. Chances are you have
never used a spreadsheet quite like this (click here for screen capture). It is a full-featured RF system
cascade parameter and frequency planner that includes filters and mixers for a mere
$45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch
and the format is entirely customizable. It is significantly easier and faster than
using a multi-thousand dollar simulator when a high level system analysis is all
that is needed. An intro video takes you through the main features...
Since 1996, ISOTEC has designed, developed
and manufactured an extensive line of RF/microwave connectors, between-series adapters, RF components
and filters for wireless service providers including non-magnetic connectors for
quantum computing and MRI equipments etc. ISOTEC's product line includes low-PIM
RF connectors components such as power dividers and directional couplers. Off-the-shelf
and customized products up to 40 GHz and our low-PIM products can meet -160 dBc
with 2 tones and 20 W test. Quick prototyping, advanced in-house testing and
high-performance. Designs that are cost effective practical and repeatable.
Sunday the 18th
This custom RF Cafe
electronics-themed crossword puzzle for June 18th contains words and clues
which pertain exclusively to the subjects of electronics, science, physics, mechanics,
engineering, power distribution, astronomy, chemistry, etc. If you do see names
of people or places, they are intimately related to the aforementioned areas of
study. Being that "R" is the 18th letter of the alphabet, it is used as the first
and/or last letter of many words in today's crossword puzzle - as well as in-between.
Those clues are marked with an asterisk (*). 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.
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...
TotalTemp Technologies has more than 40
years of combined experience providing thermal platforms.
Thermal Platforms
are available to provide temperatures between -100°C and +200°C for cryogenic cooling,
recirculating & circulating coolers, temperature chambers and temperature controllers,
thermal range safety controllers, space simulation chambers, hybrid benchtop chambers,
custom systems and platforms. Manual and automated configurations for laboratory
and production environments. Please contact TotalTemp Technologies today to learn
how they can help your project.
Friday the 16th
Stanley Leinwoll wrote a couple articles
about shortwave broadcasting for the September 1969 edition of Electronics Illustrated
magazine. "They're Taking the Guesswork out of Scatter Communications" discusses
advances (at the time) in ionospheric scattering of shortwave radio signals, and
also this one entitled "The
Grim Facts on Short-Wave Broadcasting." This is another example of the old adage
of how the more things change, the more they remain the same. Frequency crowding
was then and is now a continual challenge for operators in non-privileged bands
(spectrum purchased for private, military, government, or commercial use, e.g.,
cellphone carriers). Mitigation techniques include narrowing of channel bandwidth
(via improved modulation techniques or improved transmitter / receiver spectral
requirements), decreased transmit power levels, modification of usage regulations,
and allocation of new spectrum...
Anatech Electronics offers the industry's
largest portfolio of high-performance standard and customized
RF and microwave filters and filter-related products for military, commercial,
aerospace and defense, and industrial applications up to 40 GHz. Three new
cavity duplexer filter models have been introduced - a 450.625-452.625 / 457.625-459.625
MHz duplexer with a 1.3 dB insertion loss, a 964-1010 MHz / 1110-1156
MHz duplexer with a 1.5 dB insertion loss, and a 1018-1042 MHz / 1078-1102
MHz duplexer with a 0.7 dB insertion loss. Custom RF power filter and directional
couplers designs can be designed and produced with required connector types when
a standard cannot be found, or the requirements are such that a custom approach
is necessary...
Grammar and formatting standards have changed
over time. As technology evolves and society devolves, things like abbreviations,
use of capital letters, the "verbization*" of
nouns, interchanging of homophones (e.g., "their" and "there"), and the growingly
popular offense of eliminating the space between a number and its associated unit
(e.g., "914MHz" vs. "914 MHz") are becoming more prevalent. Look at nearly
any press release or datasheet from a component manufacturer in the past few years
and you will notice the number-unit change (I correct many of the ones I post on
RF Cafe). Some publishers (NPR) are particularly offensive at taking liberties
(aka laziness) and others (New York Times) are stalwart standard bearers
(good for them). I see many examples during my daily search for technical headlines.
We have gotten accustomed to many changes, and some have been around so long that
most people have never seen the former usage. Since I post a lot of articles from
vintage editions of the ARRL's QST magazine, I though it might be instructive
to include this list of common abbreviations used in the 1930s through 1960s (the
years I post). Most notable is the use of periods between letters and lower case
vs. upper case letters as with "a.m." (AM), "db" (dB), and "r.f." (RF)...
everything RF, the leading online publication
for the RF & Microwave industry, has
published the 1st edition of its print / digital magazine focusing on the dynamic
and ever-evolving world of wireless communication. The everything RF print / digital
magazine is packed with insightful articles, expert interviews, and groundbreaking
products, making it the go-to resource for anyone interested in staying up-to-date
with the latest developments in the RF industry. This magazine is available in print
as well as digital form. The physical print edition will be available at IMS 2023
in San Diego this week in publication bins or Booth #1617. The digital version can
be downloaded here. Inside the everything RF magazine, you will find featured articles
from diverse categories ranging from 5G to space industries. Whether you are an
industry professional or simply curious about the subject, these articles provide
a deep understanding of the fundamental concepts and highlight the newest trends
and breakthroughs in wireless communication...
I love these old
electronics company advertisements from the World War II era. It represented
a time when minor differences between citizens were put aside for the good of the
country (yours and mine). Nationalism had not yet been redefined by one-worlders
to mean that you hated the rest of the world, but rather that you had pride in your
country of birth - or legally adopted new country - and were willing to sacrifice
for the common good to preserve your way of life. The U.S. and Great Britain were
indisputably the leaders in technical invention amongst the Allied powers. Germany
and Japan led the Axis powers tech realm. That's not to say others didn't contribute
and were not vital to success. Naval aviation represents to me the assimilation
of all great technologies inclusive of ships, aircraft, electronics, weaponry, communications,
strategy, discipline, community living, isolation, navigation, and maintenance -
all in a limited space...
With more than 1000
custom-built symbols, this has got to be the most comprehensive set of
Visio Symbols available for RF, analog, and digital system and schematic
drawings! Every object has been built to fit proportionally on the provided
A-, B- and C-size drawing page templates (or can use your own). Symbols are provided
for equipment racks and test equipment, system block diagrams, conceptual drawings,
and schematics. Unlike previous versions, these are NOT Stencils, but instead are
all contained on tabbed pages within a single Visio document. That puts everything
in front of you in its full glory. Just copy and paste what you need on your drawing.
The file format is XML so everything plays nicely with Visio 2013 and later...
Innovative Power Products has been designing
and manufacturing RF and Microwave passive components since 2005. We use the latest
design tools available to build our baluns, 90-degree couplers, directional couplers,
combiners/dividers, single-ended transformers, resistors, terminations, and custom
products. Applications in military, medical, industrial, and commercial markets
are serviced around the world. Products listed on the website link to detailed mechanical
drawings, electrical specifications, and performance data. If you cannot find a
product that meets your requirements on our website, contact us to speak with one
of our experienced design engineers about your project.
Thursday the 15th
The April 1968 issue of Radio-Electronics
magazine had a series of articles on the latest in antenna technology. It included
"TV/FM Antennas Are Getting Bigger and Better," "Antenna Rotators," this "1968
Crop of CB, Ham and Communications Antennas," and a couple others, including
a build-it-yourself design for UHF television. UHF was a big deal in the day, and
was supposed to be the savior of over-the-air broadcast TV, but cable TV came on
the scene and cut the legs out from under it, so to speak. As noted by author Noel
Penn, it is interesting that the FCC often does not give an EIRP number for radiated
power, only a maximum power level into the antenna. FCC Part 97.313(c) Transmitter
power standards does specify EIRP numbers for a few sub-bands, but otherwise uses
PEP. The majority of radio users are technology users with no knowledge of or interest
in the science behind the technology. Manufacturers generally make equipment that
performs at least acceptably - albeit with some annoyances - as long as all the
components are connected properly. Nowadays with the vast majority of personal communications
(radio, TV, and Internet) being accomplished via cellphones, very few people will
ever need to mess with cables or antennas. Wireless charging eliminates that last
remaining physical connection...
"A team of researchers has developed a high-efficiency
superconducting diode with potential applications in scaling up quantum computing
and enhancing AI systems. This device can process multiple signals simultaneously,
a feature beneficial for neuromorphic computing, and is designed with more industry-friendly
materials, paving the way for broader industrial applications. A University of Minnesota
Twin Cities-led team has developed a new superconducting diode, a key component
in electronic devices, that could help scale up quantum computers for industry use
and improve the performance of artificial intelligence systems. Compared to other
superconducting diodes, the researchers' device is more energy efficient; can process
multiple electrical signals at a time; and contains a series of gates..."
This must be the early prototype for
Google Glass, was the first thing that came to mind when I saw this story in
a 1962 edition of Popular Electronics magazine. It is intended to allow
"future" astronauts to have improved situational awareness by providing means to
look behind himself without needing to turn around, and to receive mission data
via a miniature CRT embedded within the viewer. Voice communications is featured
as well. Hughes Aircraft Company (nowadays just "Hughes") might just want to consider
assigning a handful of its highly paid attorneys to look into a patent infringement
action based on the original content of its "Electrocular" headset paperwork. A
small percentage of any award paid to me will be appreciated. Here is another reference
to the Electrocular in a 1962 Science & Mechanics magazine...
Axiom Test Equipment, an electronic test
equipment rental and sales company has published a new blog post that covers how
high-speed oscilloscopes with on-board spectrum analysis capability can be a more
efficient testing approach. Traditionally, testing in the time and frequency domains
meant separate signal paths and separate units. An oscilloscope shows signals in
the time domain while a spectrum analyzer shows signals in the frequency domain.
However, a more efficient approach - and a less crowded test bench - can be achieved
using a high-speed oscilloscope with on-board spectrum analysis capability. That
way, it is possible to have multiple looks at a signal of interest with a single
unit. Specifying a
combination oscilloscope/spectrum analyzer requires defining performance ranges
for the two units, so that each will deliver the capabilities needed for a targeted
set of test applications. For an oscilloscope, this typically includes the number
of measurement channels, bandwidth per channel...
To the benefit of both professionals and
hobbyists, Radio News magazine published
Information Sheets each month that readers could easily cut out and insert into
a notebook as a handy reference. For example, one Information Sheet presents basic
information on the current-producing color sensitivities of common elements like
cesium, rubidium, and potassium, along with that of the human eye for comparison.
Another Information Sheet has a table of resistor values useful for constructing
a range-selectable voltmeter from a simple milliammeter. Also, just as today you
can buy a nearly complete AM or FM radio in the form of an IC (plus a handful of
external components), it was possible even in 1930 to buy a complete radio receiver
for integration into a chassis either as just a radio or as part of a combination
unit that might also contain a record player. Some spec sheets for a few of those
are included here as well just so you can see what they looked like - including
all the vacuum tubes...
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!
TotalTemp Technologies has more than 40
years of combined experience providing thermal platforms.
Thermal Platforms
are available to provide temperatures between -100°C and +200°C for cryogenic cooling,
recirculating & circulating coolers, temperature chambers and temperature controllers,
thermal range safety controllers, space simulation chambers, hybrid benchtop chambers,
custom systems and platforms. Manual and automated configurations for laboratory
and production environments. Please contact TotalTemp Technologies today to learn
how they can help your project.
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.
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- Christmas-themed
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