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4 of the November 2021 homepage archives.
Sunday the 14th
Many Thanks to San Francisco
Circuits for Continued Support!
SF Circuits' specialty is in the complex,
advanced technology of PCB fabrication and assembly, producing high quality multi-layered
PCBs from elaborate layouts. With them, you receive unparalleled technical expertise
at competitive prices as well as the most progressive solutions available. Their
customers request PCB production that is outside the capabilities of normal circuit
board providers. Please take a moment to visit San Francisco Circuits today. "Printed
Circuit Fabrication & Assembly with No Limit on Technology or Quantity."
Science Terms Crossword Puzzle for November 14th
This
technically
themed crossword puzzle for November 14th contains only clues and words are
directly to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry,
physics, and other science subjects. As always, this crossword contains no names
of politicians, mountain ranges, exotic foods or plants, movie stars, or anything
of the sort unless it/he/she is related to this puzzle's technology theme (e.g.,
Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists
amongst us will appreciate the effort. Enjoy!
Saturday the 13th
Many Thanks to KR Electronics for
Long-Time Support!
KR Electronics designs and manufactures
high quality filters for both the commercial and military markets. KR Electronics'
line of filters
includes lowpass, highpass, bandpass, bandstop 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.
Friday the 12th
Microwaves Part V - Waveguide
Although the subtitle of Part V of
the 1949 Radio-Electronics magazine "Microwaves"
introductory series in refers to Special Sections of Waveguide Are Employed as Transformers,
author Palmer is discussing not impedance transformers but physical configuration
transformations. That includes in-between rectangular, circular, and oval cross-sections,
in-between waveguide and coaxial cable, and rotary joints. Signal injection and
extraction via stubs are also covered. He provides a high level introductory description
of how microwave frequency waveguide works without delving into the scary mathematics
required to design the components...
Teledyne e2v HiRel Intros
TDGD271 and TDGD274 Drivers for GaN FETs
Teledyne e2v HiRel today announced availability
of a pair of new isolated gate drivers ideally suited for
driving GaN power parts used in a wide variety of power supply, dc/dc converter,
battery management systems (BMS), Point-of-Load (POL) modules and motor control
applications. The TDGD27x isolated gate drivers utilize silicon isolation technology,
supporting up to 2.5 kVrms. This technology enables industry leading common-mode
transient immunity (CMTI), tight timing specifications, reduced variation with temperature
and age, better part-to-part matching, and 100% AC/DC testing at -55°C to 125°C...
Topological Insulator Design Makes 30 Lasers Emit as
1
"An
array of 30 vertical cavity surface emitting lasers (VCSELs) has been made to
behave as a single coherent light source for the first time, paving the way for
large-scale, high-power applications that were previously out of reach for this
popular class of laser. The design of the new array draws on concepts from the field
of topological insulators, and its developers are now working with industrial partners
to refine the technology for use in medical devices and communications networks.
VCSELs are the most common lasers in the world, routinely used in application areas
ranging from portable phones and optical communications to instrumentation, manufacturing,
sensing and even facial recognition. Like other lasers, they contain a gain medium
in which light is generated and emitted..."
Say You Saw It in QST
In the early 1930s, QST magazine
(ARRL's monthly publication) usually ran a line at the bottom of every page in the
back half of each issue that said, "Say You Saw
It in QST - It Identifies You and Helps QST." They even got the capitalization
correct (all lower case short prepositions and conjunctions, but I digress). The
December 1933 edition was a bit different, however, in that all the left-hand pages
had the message translated into one of fourteen different languages while the right-hand
pages used English. I deemed that discovery cool enough to scan and post here. Since
the only languages I speak with any fluency are English and Pig Latin...
R&S, OpenWorks Prove Counter UAS
Tech at NATO TIE
Rohde & Schwarz and OpenWorks have collaborated
to prove a new high performance and autonomous 3D detection and tracking system
for use in
counter unmanned aerial systems (C-UAS) missions. Integrated through the new
SAPIENT standard protocol and tested at the NATO Technical Interoperability Exercise
(TIE) event in De Peel Airbase in the Netherlands, the solution combines the proven
R&S ARDRONIS drone detection solution with the recently released SkyAI Autonomous
Optical technology. Rohde & Schwarz and OpenWorks successfully prove C-UAS solution
during NATO Technical Interoperability Exercise. NATO TIE will evaluate how the
latest autonomous C-UAS sensors interact, using a new "plug and play" standard called
SAPIENT, with the latest command and control systems and decision engines; ultimately
testing performance against escalating UAS threats...
Victimized by a Record Moocher
"A
record 'Moocher' is one of the lowest forms of human life. He has no particular
habitat but can be found wherever there is a record owner." So says Norman Van Tubergen
in this 1958 Popular Electronics magazine article. Anyone who grew up in
the record player era, or for that matter the 8-track tape or cassette tape era
has known (or has been) such a moocher. This is the person who was always asking
to borrow your music media either for listening to on his personal equipment or
for copying onto his own tape (cassette or reel-to-reel). He rarely ever bought
any of his own music, but was more than happy to generously re-lend his copies to
fellow Moochers, and of course he never had anything you might want. The modern-day
equivalent is the person who is always bugging you to let him/her copy your music
file that you either paid for as a download or purchased in CD/DVD format...
Promote Your Company on RF Cafe
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 16,000 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. I also re-broadcast homepage
items on LinkedIn. If you need your company news to be seen, RF Cafe is the
place to be.
Many Thanks to Amplifier Solutions
Corporation (ASC) for Continuing Support!
ASC designs and manufactures hybrid, surface
mount flange, open carrier and connectorized amplifiers for low, medium and high
power applications using gallium nitride (GaN), gallium arsenide (GaAs) and silicon
(Si) transistor technologies. ASC's thick film designs operate in the frequency
range of 300 kHz to 6 GHz. ASC offers thin film designs that operate up
to 20 GHz.
Thursday the 11th
Raytheon Vacuum Tubes
Most aviation enthusiasts upon hearing the
name
Pan American "Clipper" thinks of the large four-engined amphibious airliner.
There were other models of the Clipper, however, including the Douglas DC-4, the
Lockheed Constellation, and the Boeing 377. The latter appear to be the early concept
model depicted in this 1945 Raytheon vacuum tubes promotion in Radio-Craft magazine.
Raytheon was a major supplier of electronic components, equipment, and systems for
the military and government throughout World War II. Manufacturers came to
trust and rely on the big-name companies for high quality and dependable components.
By the time this advertisement appeared, Germany had recently signed an unconditional
surrender, and Japan was only a few months away from total defeat. Sadly, many of
the familiar names from the era have either been acquired by foreign firms (and
usually renamed) or have gone out of business due to poor management decisions (usually
from failing to keep up with changing times)...
Gain Medium Boosts Sonic Crystal "Saser"
You are familiar with the laser and maser.
Meet the the "saser." "Researchers in China and Spain have succeeded in making a
saser - the equivalent of a laser for sound waves - by adding a gain medium to artificial
acoustic materials known as sonic crystals. The new saser could have applications
in medical ultrasonics and non-destructive materials testing, among other areas.
Gain media (also known as active media) are commonplace in optics and are a crucial
part of lasers. However, they have not really been employed for sound waves before,
explains Johan Christensen, an expert in acoustic metamaterials at the Universidad
Carlos III de Madrid. In a laser, the gain medium typically consists of a material
such as a semiconductor, doped crystal or glass surrounded by a highly reflective
optical cavity. By stimulating electrons within this medium to release energy due
to collisions with photons in the cavity..."
First Over-the-Horizon TV Bridge
In the days before satellite communications
(Telstar I, c1962), long-range television broadcasts relied on an extensive
(and expensive) series of line-of-sight microwave towers. Each site had land ownership
and maintenance expenses, so there was an incentive to streamline operations. Development
of an
over-the-horizon relay system enabled a reduction in sites and streamlining
of operations - at least in theory. History shows that these installations must
not have provided the improvement needed to implement them on a larger scale than
that reported here. Nowadays, the proliferation of cellphone towers for ubiquitous
coverage of wireless telecommunications has proven that huge numbers of individual
sites can be profitable given a large enough customer base. You can scarcely go
anywhere anymore without being able to spy a cell tower sticking out over the landscape...
Veterans Day 2021: A Pittance of
Time
This is my annual
Veterans
Day tribute. On November 11 (the 11th day of the 11th month), at 11:00 am (the
11th hour), we observe 2 minutes of silence in honor of countrymen who "gave the last full measure of devotion." A Pittance of Time
is performed by Canadian citizen Terry Kelly (he
went blind at an early age). It was written after an experience he had on Veterans
Day in 1999. It is done in the finest Celtic tradition.
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 LadyBug Technologies
for Their Continued Support!
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.
Wednesday the 10th
Lady Television Engineer
There is no denying that in 19th and 20th
Century America and most other industrialized countries, non-white males dominated
the academic, commercial, and industrial design and service workforce. Societal
norms were much different in those times, and the truth is most women did not desire
to enter into the "professional" market. Many performed low skill labor and assembly
functions, serving an essential yet less demanding role in providing goods and services
for the world. This 1949 "Lady
Television Engineer" story appearing in Radio-Electronics magazine
celebrated Tex Barbarite as a ground-breaking and glass-ceiling-breaking woman
in the commercial television broadcast industry. As was common in the era, Ms. Barbarite's
public platform was used to give encouraging insight into her path to success -
not to complain and dwell on resistance met in her effort. BTW, would it be politically
incorrect to point out, as evidenced by the complaints of others, that it was mostly
White males who envisioned and created the most of the modern world...
Many Thanks to Exodus
Advanced Communications for Their Support
Exodus Advanced Communications is a multinational
RF communication equipment and engineering service company serving both commercial
and government entities and their affiliates worldwide. Power amplifiers ranging
from 10 kHz to 51 GHz with various output power levels and noise figure
ranges, we fully support custom designs and manufacturing requirements for both
small and large volume levels. decades of combined experience in the RF field for
numerous applications including military jamming, communications, radar, EMI/EMC
and various commercial projects with all designing and manufacturing of our HPA,
MPA, and LNA products in-house.
Topological Insulator Design Makes 30 Lasers Emit as
1
"An
array of 30 vertical cavity surface emitting lasers (VCSELs) has been made to
behave as a single coherent light source for the first time, paving the way for
large-scale, high-power applications that were previously out of reach for this
popular class of laser. The design of the new array draws on concepts from the field
of topological insulators, and its developers are now working with industrial partners
to refine the technology for use in medical devices and communications networks.
VCSELs are the most common lasers in the world, routinely used in application areas
ranging from portable phones and optical communications to instrumentation, manufacturing,
sensing and even facial recognition. Like other lasers, they contain a gain medium
in which light is generated and emitted..."
Superconductor State of Matter Involves Cooper Pairs
"Cool a material below its
superconducting transition temperature and you'd expect it to start conducting
electricity without resistance and expelling magnetic fields. But an international
group of physicists has found that a certain kind of iron-based material doped with
negative charges does the opposite at around the same temperature - producing spontaneous
magnetic fields and retaining resistance when chilled. The researchers say that
the results point to a new state of matter in which electrons flow in correlated
groups of four, rather than two. According to the Bardeen-Cooper-Schrieffer (BCS)
theory, superconductivity occurs when electrons get together to form what are known
as Cooper pairs..."
Radio Broadcasting Stations
The Federal Communications Commission (FCC)
claimed in 2013 to be receiving more than 30,000 applications per year for
commercial broadcasting licenses. That covers the gamut from AM and FM to television,
Low Power FM, Low Power TV, translators and booster stations, as well as some non-commercial
stations for educational purposes. Inexpensive, turnkey broadcast station equipment
make entry into the realm very affordable. Accordingly, there are many stations
vying for space in a very crowded section of the electromagnetic spectrum. Contrast
that to the year 1932 list of broadcasting station in the U.S. which was able to
fit onto a single page of the Radio News magazine - about 500 to 600 in number.
Interestingly, the wavelengths are expressed in meters, at a time when metric units
were rarely used in the U.S...
Sparton Model 60 Short-Wave Converter Radio
Not everyone is into radio history, so items
like this advertisement for Sparton Radio's Model 60 Short-Wave Receiver which appeared
in the April 1932 issue of QST will not invoke much or any interest. On
the other hand, there is a large contingent of hobbyists and professionals who enjoy
seeing these historical snapshots of the places from whence we have come technically.
Products like radios, kitchen appliances, automobiles, etc., were constructed very
robustly with metal, wood, and fabric. No cheap plastic will be found anywhere,
but maybe not for the reason you think - plastic as we know it today had not entered
the commercial marketplace yet. In fact, many "modern" plastic formulas and processes
were a closely held military secrets until the end of World War II.
RF & Electronics
Symbols for Visio
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...
Please Visit Empower RF's Website in
Appreciation of Their Support
Empower RF Systems is a global leader in
power amplifier solutions. Empower RF Systems is an established and technologically
superior supplier of high power solid state RF & microwave amplifiers. Our offerings
include modules, intelligent rack-mount amplifiers, and multi-function RF Power
Amplifier solutions to 6 GHz in broadband and band specific designs. Output
power combinations range from tens of watts to multi-kilowatts. Unprecedented size,
weight and power reduction of our amplifiers is superior to anything in the market
at similar frequencies and power levels.
Tuesday the 9th
Electronics Themed Comics
Both of these
vintage electronics-themed comics, which appeared in a 1946 issue of Radio-Craft
magazine, have a unique feature. The first is one of the very popular (then and
now) "Radio Term Illustrated" comics where a reader suggested a way to relate a
common term or phrase to a situation in the technical realm which can be similarly
interpreted. In this case the subject is a "dynamic speaker." It is a form of a
double entendre. The other comic mocks the use of "handie-talkies" as a prop for
abetting an unlawful act. In this same issue is an article entitled "Inside the
Handie-Talkie" that is sort of a reverse engineering exercise on what was a relatively
new technology from the recently ended World War II era. This cartoon was considered
profound enough to warrant an editorial remark by the magazine...
Remote Control Weapons
World War II brought about the first
wireless remotely controlled weapons. Prior to radio technology, bombs and missiles
needed to either be within a distance serviceable by detonation wires, or were set
off using mechanical or electrical timers. Both of those methods required the operator
to gain access to the target area at a time relatively close to when the attack
was to occur. Army battalions did have warheads with spooled wires attached that
enabled them to control the time of detonation and even in some instances some degree
of steering, but range was limited. Wireless technology enabled weapons to be delivered
and controlled over great distances. Missiles could be directed enroute and bombs
could be planted practically anytime and anywhere to await a signal when appropriate.
Hugo Gernsback wrote a short op-ed...
General Electric Announces Split
into 3 Companies
Another great American company is feeling
the pain of a diminishing national dominance in world markets.
General Electric just announced it will break into three separate companies
- energy, health care and aviation. I place the blame on both management and labor.
Management in this "woke" era puts far too much emphasis on very costly political
correctness, selling IP to foreign interests, and bending over to politicians' whims
while labor (union and non-union) has permitted and even abetted the outsourcing
of jobs and offshoring of manufacturing. This has been happening for a few decades,
and the country has paid severely for it. Consider all the stalwart century-old
manufacturing and retail companies gone, acquired by foreigners, or otherwise minimalized:
Westinghouse, RCA, Bell, Pontiac, IBM, Motorola, Oldsmobile, Sears Roebuck, Firestone
- even Budweiser is now based in Belgium. The list is huge. Will the last founding
American company please turn out the lights on the way out?
New Dimension in Magnetism and Superconductivity
"An international team of scientists from
Austria and Germany has launched a new paradigm in
magnetism and superconductivity, putting effects of curvature, topology, and
3D geometry into the spotlight of next-decade research. The results are published
in Advanced Materials. Traditionally, the primary field in which curvature plays
a pivotal role is the theory of general relativity. In recent years, however, the
impact of curvilinear geometry has entered various disciplines, ranging from solid-state
physics to soft-matter physics to chemistry and biology; and giving rise to a plethora
of emerging domains, such as curvilinear cell biology, semiconductors, superfluidity,
optics, plasmonics and 2D van der Waals materials. In modern magnetism, superconductivity
and spintronics, extending nanostructures into the third dimension has become a
major research avenue..."
Introduction to Wave-Generation and Wave-Shaping
Upon completion of this chapter, you will
be able to: 1. State the applications of a
resonant circuit. 2. Identify the conditions that exist in a resonant circuit.
3. State and apply the formula for resonant frequency of an AC circuit. 4. State
the effect of changes in inductance (L) and capacitance (C) on resonant frequency
(fr). 5. Identify the characteristics peculiar to a series resonant circuit. 6.
Identify the characteristics peculiar to a parallel resonant circuit. 7. State and
apply the formula for Q. 8. State what is meant by the bandwidth of a resonant circuit
and compute the bandwidth for a given circuit. 9. Identify the four general types
of filters. 10. Identify how the series- and parallel-resonant circuit can be used
as a bandpass or a band-reject filter...
Admiral "Aeroscope" Midget Sets Radio Service
Data Sheet
For many years I have been scanning and posting
Radio Service Data Sheets like this one featuring the
Admiral "Aeroscope" 161-5L, 162-5L, and 163-5L Midget Set models which appeared
in a 1939 issue of Radio-Craft magazine. There are still many people who restore
and service these vintage radios, and often it can be difficult or impossible to
find schematics and/or tuning information. Some websites offer to sell this information,
but often what is shown here is enough to get an old radio working again since most
times both schematics and alignment steps are included. I keep a running list of
all data sheets to facilitate a search...
Many Thanks to Withwave for Continued Support!
Withwave manufactures an extensive line of
metrology quality coaxial test cable assemblies, connectors (wave-, end-, vertical-launch,
board edge, panel mount), calibration kits (SOLT), a
fully automated
4-port vector network analyzer (VNA) calibrator, between- and in-series connector
adaptors, attenuators, terminations, DC blocks, torque wrenches, test probes &
probe positioner. Special test fixtures for calibration and multicoax cable assemblies.
Frequency ranges from DC through 110 GHz. Please contact Withwave today to
see how they can help your project succeed.
Monday the 8th
Tuning on the U.H.F.
Although this "Tuning
on the UHF" article refers to a specific radio band popular for "shortwave listening,"
the information therein is generally applicable to any band. It appeared in a 1945
issue of Radio-Craft magazine, at a time predating widespread ownership of television,
where instead of watching the boob tube many people enjoyed tuning in broadcast
stations from across the country and across the globe. Radio was still a mysterious
and magical thing. A tapped coil, variometer, permeability tuner, standard coil-condenser,
and General Radio butterfly tuner are possible methods for any frequency typically
used...
What to Do with a Tape Recorder
Remember
tape recorders? They were a big deal in 1963 when these comics appeared in
Popular Electronics magazine, but they began going the way of the typewriter
about three decades ago when solid state voice recorders hit the market, but now
smartphones with sound recording have made even those devices seem outdated. In
fact, when my daughter's house burned down a few weeks ago, all of the on-site conversations
with the insurance adjuster, fire marshal, and housing contractors were recorded
to ensure an accurate account of what was said by all parties. In North Carolina,
law does not require you to apprise other parties taking part of the conversation
that they are being recorded, so long as the person doing the recording is an active
participant in the conversation (aka "one-party consent"). But I digress... back
to the tape recorder era. These four comics were drawn by Mr. Bill Hutchinson back
when not only...
Practical Electric Airplanes Decades Away
"Electric
Airplanes Won't Make Much of a Dent in Air Travel for Decades to Come. Reason:
Batteries are nowhere near able to sustain wide-body airliners over flights measuring
in the thousands of kilometers. Exaggeration has become the default method for news
reporting, and the possibility of commercial electric flight has been no exception,
with repeated claims that these new planes will utterly change how we live. In 2017,
Boeing and JetBlue funded Zunum Aero, a U.S. company that promised nothing less
than transforming air travel with short-haul electric planes capable of carrying
12 people - and doing it by 2022. Two years later Boeing declined to continue funding
the project. At the Paris Air Show..."
Meteor Detection by Amateur Radio
The 1940s and 1950s was an era of much advancement
in our knowledge of Earth's upper atmosphere and its affects on
radio communications - both good and bad as reported by this 1947 issue of
QST magazine. Industry, government, academic, and amateur groups all played
major roles in conducting experiments and publishing findings for the interested
community to share and build upon. Still today a huge amount of research is being
carried out to better understand how the various layers of the atmosphere - from
ground level to space - are affected by extraterrestrial influences. A year ago
I posted an article, along with a bit of editorializing, from the July 1958 edition
of Radio-Electronics entitled..."
WWV/WWVH Scientific Modulation Working
Group
Website visitor
Rick L. wrote to say, "I was listening to WWV this morning in order to coordinate
all my clox throughout the QTH here in Taxconsin (sic) and caught the announcement
on this:"
WWV/WWVH Scientific Modulation Working Group. "NIST is participating in a new
project to study the ionosphere and its effects on high frequency (HF) radio propagation.
As part of the WWV/WWVH Scientific Modulation Working Group, radio stations WWV
and WWVH will each broadcast test signals once per hour that will allow operators
using a type of software defined receiver (SDR) to record the signal data at their
location and upload it to a central server for analysis..."
Post Your Engineer & Technician
Job Openings on RF Cafe for Free
RF Cafe's raison d'être is and always has
been to provide useful, quality content for engineers, technicians, engineering
managers, students, and hobbyists. Part of that mission is offering to post applicable
job openings. HR department employees and/or managers of hiring companies are welcome
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accepted). 3rd party recruiters and temp agencies are not included so as to assure
a high quality of listings. Please read through the easy procedure to benefit from
RF Cafe's high quality visitors ...
Thanks to PCB Directory for Continued
Support!
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.
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.
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 nice 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.
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.