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4 of the October 2021 homepage
archives. Sunday the 31st
 This
Engineering &
Science Theme crossword puzzle for October 31st has many words and clues related
to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics,
and other technical 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!
 Atenlab has been operating in Taiwan for
more than a decade, and has sold and installed hundreds chambers around the world.
Holistic, affordable Over-the-Air
(OTA) measurement systems perform comprehensive measurement and test in a controlled
environment. Compact Antenna Test Range (CATR) with one-touch operation supports
multiple systems - 2G, 3G, 4G, 5G - and major instrument brands. [M]ulti-probe OTA
measurement systems offer reduced time measurements over single-probe systems.
Friday the 29th
 Applying the adjective "portable" to electronics
equipment in the vacuum tube era was often a stretch of the term. Usually, portable
radios were backpack ordeals with a separate battery carried by second person. They
can be seen in a lot of the old War War II movies. It was really not until
the advent of the "Handie-Talkie"
two-way radio sets that a truly hand-held, self-contained system was available.
This "Inside the Handi-Talke" article from a 19467 issue of Radio-Craft magazine
provides a very detailed look at the internal components and of the schematics.
"Walkie-Talkie" was another name often given to the Handi-Talkie, although some
might argue that there is a distinct difference. Handi-Talkies used to be widely
available on eBay, but are very scarce at this time - and the sale prices reflect
that reality. A lot of the listings use the term Handi-Talkie as a ruse...
 "From the internet, to fiber or satellite
communications and medical diagnostics, our everyday life relies on optical technologies.
These technologies use optical pulsed sources to transfer, retrieve or compute information.
Gaining control over optical pulse shapes thus paves the way for further advances.
Ph.D. student Bennet Fischer and postdoctoral researcher Mario Chemnitz, in the
team of Professor Roberto Morandotti of the Institut national de la recherche scientifique
(INRS), developed a
smart pulse-shaper integrated on a chip. The device output can autonomously
adjust to a user-defined target waveform with strikingly low technical and computational
requirements..."
 Here is a little levity from the "Hobnobbing
with Harbaugh" series of comics that appeared in Popular Electronics magazine. Unfortunately,
none of the "The
5 Most Wanted Household Inventions" have come to full fruition in the marketplace
yet, although the cellphone blockers can be found on the Internet in various unofficial
forms. Personal computers were a pipe dream in 1963, but nowadays we do have software
like TurboTax to take care of filing taxes, although you still can't simply dump
all your receipts into a bin and have it work. Flat-fixing robots might not be needed
in a few years as tubeless, airless tires hit the road. Alarm clock vaporizers are
not Star Trek phaser-like devices yet, but the same effect can be affected with
a low-tech hammer, or a shoe...
 Whilst
checking on something else regarding Guerrilla RF, I noticed that they have
a few job openings
posted that include: SOI Design Engineer, PA Design Engineer, Quality and Reliability
Engineer, and Reliability Engineering Technician. They are based in the Greensboro,
NC, location. Guerrilla RF was founded by Ryan Pratt the engineer son of an
original founder of RF Micro Devices (now
Qorvo, who
also has many job openings worldwide). I'm not getting paid for this, but please
let them know you saw them mentioned on RF Cafe.
 "Unprecedented
openings for non-engineers result from industry growth and shortage of skilled
men." Thus goes the subtitle for this 1957 Radio & TV News magazine
article pitching the promises of a career in electronics technology. It came at
a time that predated throw-away everything rather than attempting to repair stuff.
It was before the term "personal device" (aka "throw-away") had been coined. It
was before placards warning "No user serviceable parts inside" were routinely stuck
on practically every item purchasable in a department store. It was a time when
people took stuff apart to see how it works, and were actually able to figure it
out because parts were large enough to see and actually moved, and even printed
circuit boards could be deciphered since trances were on the two outside surfaces
and components had leads...
 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!
 Triad RF Systems designs and manufactures
RF power amplifiers
and systems. Triad RF Systems comprises three partners
(hence 'Triad') with over 40 years of accumulated
knowledge of what is required to design, manufacture, market, sell and service RF/Microwave
amplifiers and amplifier systems. PA, LNA, bi-directional, and frequency translating
amplifiers are available, in formats including tower mount, benchtop, rack mount,
and chassis mount. "We view Triad more as a technology partner than a vendor for
our line-of-sight communications product line." Please check to see how they can
help your project.
Thursday the 28th
 I have mentioned this before, but nearly
always the setting for John Frye's "Mac's Service Shop" technodrama stories coincide
with the time of year corresponding to the month in which it appeared (for the northern
hemisphere) - in this case the July 1952 issue of Radio & Television News
magazine. In addition to that, Barney's crack about Mac using his slide rule to
try calculating who the president would be is also time-appropriate since 1952,
being a Leap Year, was also an election year (Eisenhower beat Stevenson, BTW) ...but
I digress. Mac's actual preoccupation was with
open wire transmission lines. With the rise of UFH broadcasting on the horizon,
he predicted that such lines would become popular due to their lower signal attenuation
compared to standard 300 Ω plastic-insulated twin lead. Open line (aka ladder
line or window line) at 500 MHz exhibits about a quarter the loss when dry
and as much a twentieth the loss when wet (depending on the quality of the standard
300 Ω twin lead)...
 "Researchers at Delft University of Technology
have found a new way to
cool radio waves all the way down to their quantum ground state. To do so, they
used circuits that employ an analog of the so-called laser cooling technique that
is frequently used to cool atomic samples. The device used a recently developed
technique the researchers call photon pressure coupling, which is predicted to be
of use in detecting ultra-weak magnetic resonance (MRI) signals or for quantum-sensing
applications that can help the search for dark matter. The results have been published
in Science Advances. The radio waves we usually encounter in our daily lives, such
as those that we listen to in our car or those that send signals to our baby monitors
in our house, are hot: they contain noise that comes from the random motion of the
atoms in the things..."
 Sam Benzacar of
Anatech Electronics, an RF and microwave filter company, has published his October
2021 newsletter that features his short op-ed entitled "A Solution Has Arrived for
Deploying Millimeter-Wave 5G," where he notes that early driving trials conducted
by equipment supplier Movandi demonstrate consistent minimum data rates of 1 Gbps
are achievable even in urban areas. The scheme involves massive deployment of mm-wave
repeaters (effectively small cells), which network planners now believe will be
a more reliable and affordable solution to towers due to the extreme signal attenuation
(line-of-sight and within obstacles) in the tens of GHz realm. Sam also presents
some relevant industry news items as well.
 This
electronics crossword puzzle by Arthur Branch was published in the September
1957 issue of Popular Electronics magazine. Given the era of creation,
there are some clues and words that are a little outdated and might not be familiar
with younger puzzle workers, but the only one that really looks potentially troublesome
is 29 Across: "Tubes that operate at firing voltage." Unlike the weekly crosswords
from RF Cafe that uses only relevant technical words, this one fills in some spaces
with common words when necessary. It's still a good puzzle, though...
 The great Bob Pease, National Semiconductor's
crown jewel, wrote an article many years back that described how breadboarding can
be useful for prototyping even sophisticated circuits as long as the limitations
are understood and heeded. Many times I have searched the Internet looking for a
picture of the breadboard I recalled seeing, but to no avail. Finally, I wrote to
him asking if he remembered it and he responded by saying it is the one featured
on the cover of his book, "Troubleshooting Analog
Circuits." You can click on the image to the right for the full picture. Bob
wrote, "THIS was actually the breadboard for the LM131 V-to-F converter - which
I designed in 1977, and which is still being designed in, today, and is still in
production. Yes, it can be used to convert voltages to F - and then you use a counter,
to make a very linear digital conversion - or for F-to-V..."
 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 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.
Wednesday the 27th
 Here are three more
electronics-themed comics for you, these from a 1949 issue of Radio-Electronics
magazine. The first one is probably still a concern for parents today, although
the dilemma would probably be with the kid fiddling with the remote control rather
than with the buttons on the TV set. The second might require you to be old enough
to remember when both doctors and electronics servicemen made house calls. The third
comics is my favorite due to its cleverness at portraying what was a common occurrence
with boys wanting to watch a baseball game but not having the money for entrance
to the ballpark. Spanky and the gang of The Little Rascals used to pull that stunt
a lot. I took the liberty of colorizing the comics...
 Every week while sitting in the studio where
Melanie takes her violin lessons, I usually read technical and hobby magazines,
but at the time I was been studying the ARRL General Class License Manual in preparation
for taking the written exam in a couple months. One time a lady saw the book title
and remarked, "I didn't
know ham radio people were still around." Wow. It would be tempting to blame
her for being ignorant, or to blame the ARRL for not adequately getting the word
out, but the reality is that for the most part the mass media does not consider
Ham radio's contribution to be significant enough to cover in news stories. Amateur
radio operators perform a mighty public service in times of trouble, but they do
it so efficiently and effectively, without actively seeking credit, that their efforts
are lost in the noise. Ham radio operators have been on the front lines of national
and civil defense since World War II and even a bit before (see links below).
So important have been the contributions of Ham operators that the FCC has consistently
protected the very valuable spectrum reserved for amateur radio...
 "Most
every electronic circuit will pose the threat of EMI radiation on other circuitry,
with drones and UAVs being particularly susceptible. There’s one simple but important
solution: implement EMI shielding. Most
drones and unmanned aerial vehicles (UAVs) rely heavily on seamless communication
from ground systems. Cell-phone towers, buildings and large metal structures, high-voltage
power lines, and a high concentration of Wi-Fi networks in an area can cause serious
electromagnetic interference (EMI) in drone performance. EMI effects on drone operations
are unpredictable. They can severely disrupt a drone’s navigation system by shifting
the drone's compass out of alignment. When flying close to large structures, EMI
can degrade the quality of GPS reception..."
 Keith Barkley published an article in the
June 2001 issue of RF Design magazine entitled, "Two-Tone
IMD Measurement Techniques." Seven rules to ensure the best characterization
of non-linear RF components. He writes: "Two-tone testing for intermodulation distortion
(IMD) has a long and venerable history. Since the dawn of RF engineering, it has
been used to characterize the non-linearity of RF components, both active and passive
Measurement methods, pitfalls and tidbits of information have been gathered over
the years by myriad sources, here and elsewhere. A few simple rules can help in
setting up a test system that can accurately measure two-tone IMD for RF power transistors.
For this discussion, f1 and f2 will denote the two signals' input into the device
and Δf will be the frequency separation between them..."
 Here is a very useful article on the benefits
and technical challenges of
stacking antennas; it appeared in a 1958 issue of Radio-Electronics magazine.
It avoids rigorous mathematical analysis and instead presents recommended guidelines
and includes some very nice measured antenna patterns (no computer-generated predictions
in 1958) of the various configurations. The authors discuss radiation pattern changes
based on horizontal versus vertical stacking, and a combination of both. Plotting
all the vertical and horizontal radiation patterns would have take a lot of time
with a slide rule back in the day. This is the first of a series written by engineers
at the Scala Radio Company...
 RF Cascade Workbook 2018 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...
 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.
Tuesday the 26th
 Radio-Craft magazine ran a regular
feature entitled "Radio-Electronics
Monthly Review," which reported on industry news and events. The death of diode
electron tube inventor Sir Ambrose Fleming appeared as a major item. He lived to
the ripe old age of 95½ - an amazing feat at a time when the average lifespan of
a male born in 1949 was less than 40 years. Regardless of the year born, your life
expectancy increases as you get older both due to better available lifestyles, nutrition,
and medicine, and because you continually cross benchmarks of genetic and environmental
factors that take out others born in the same era. Another interesting item was
the call for more ubiquitous deployment of 2-way radios (walkie-talkies) in rural
areas to compensate for a relative lack of telephone service...
 "An international research team, with the
participation of the Institute of Molecular Science (ICMol) of the University of
Valencia, has achieved spin-electric control in
molecular nanomagnets. This fact offers great advantages when preparing quantum
devices based on magnetic molecules. The work has been published in the journal
Nature Physics. For some time, science has been looking for viability in the development
of devices based on quantum bits (qubits), basic units of a quantum computer. In
magnetic materials, a possible qubit is provided by the spin-quantum property of
elementary particles such as the electron. In this context, the electrical control
of spin offers important advantages for the development of quantum computing and,
in general, quantum technologies. An international research team with the participation
of ICMol has taken a step forward in this field by achieving..."
 Skyworks is pleased to introduce SKY68031-11,
the world's smallest,
multi-band RF front-end (RFFE) module for licensed, low-power, wide-area network
(LTE-M/NB-IoT) applications including asset tracking, health and fitness wearables,
smart metering and industrial monitoring. This module integrates the entire RF front
end necessary for a cellular IoT radio operating in low-band (5, 8, 12, 13, 14,
17, 18, 19, 20, 26, 28, 85) and mid-band (1, 2, 3, 4, 25, 39, 66, 70) frequencies.
The FEM monolithically integrates a broadband power amplifier, transmit harmonic
filters, antenna switch and MIPI RFFE controller, all in a compact 3x3 mm package...
 Wharfdale is a brand well known to stereo
hobbyists and professionals for more than half a century - particularly in Europe.
Wharfdale Wireless Works was founded by British entrepreneur Gilbert Briggs in 1933,
and still sells speakers under the name "Wharfdale." As a pioneer in high fidelity
sound reproduction, Mr. Briggs was highly sought as an author by electronics and
audio media. In May 1957, he wrote this article for Radio & TV News
magazine. Studies of the audio response of the human ear and the physics of the
space where speakers and listeners would be were undertaken as the electronics age
progressed in the post-war years and consumers began seeking more than simply noise
emanating from a loudspeaker...
 Is it my imagination, or do the
SMA connectors at the arrows appear to be not fully seated? Per the article: "Proponents
of quantum technology believe its will change the world. Others remain skeptical,
as they do of technologies like fusion energy. Speaking at a quantum developers'
forum, IBM Distinguished Engineer Jan-Rainer Lahmann retraced the history of quantum
computing, reviewing IBM's hardware and development roadmaps and describing the
ingredients of 'Raspberry
Pi Quantum.' The history of quantum computing goes back four decades to a conference
where the Nobel laureate Richard Feynman introduced the idea of simulating quantum
mechanical systems on a traditional computer. At the time, this required a significant
computational resources. Even with Moore's Law scaling, it was clear to Feynman
and many others..."
 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 to submit opportunities for posting at
no charge (of course a gratuity will be graciously 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 ...
 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.
Monday the 25th
 On the May 13, 2005 episode of The Tonight
Show, Jay Leno held a Morse code vs. SMS speed contest between two Ham Radio operators
using Morse code and two Millennials using their smartphones for texting (SMS).
At least one member of the audience thought texting would win. Watch the video to
see if she was right. Mr. Chip Margelli (K7JA) did the sending. He declares, "Let
me assure you that we never saw that message before I flipped the blue card over.
Each message, in rehearsal, was different. The character count was the same as the
one during dress rehearsal, though, to account for the time slot. And they put the
card on the table "upside down" creative to how I flipped it, as you can see on
the video." Mr. Ken Miller (K6CTW) did the receiving...
 In 1966, Paul Rockwell wrote a 4-part series
for the ARRL's QST magazine on station design for long distance communications
(DX) that covered antenna selection and siting (Part I), economics and construction
(Part II), Station Configuration and Receiver Topics (Part III), and Propagation
Quirks and Operating Tips (Part IV). This the the forth and final installment. One
of the handy-dandy items shown is a
Geochron
Map-Clock which had a template of the familiar day-night analemma-based curve
superimposed on the projection map of the earth. It was quite a deal in its day,
and believe it or not, the company is still in business offering software-based
Map-Clocks and restoring models all the way back to when they first came out in
1965 (only a year before it appeared here)...
 "Stacks of
atomically thin sheets of molybdenum
disulfide both move and block heat. Packing transistors close together raises the
problem of heat frying the devices. Now scientists have developed an artificial
material that is one of the best ever at conducting heat in one direction while
keeping that heat insulated from its surroundings in other directions. The research
might one day help microchips grow more powerful without breaking from overheating.
As electronics continue to miniaturize, greater amounts of heat are getting produced
in a given space, which makes heat control a key challenge in electronic design..."
 Do you know what a soroban is? I have to
admit ignorance prior to reading this 1963 "Carl and Jerry" adventure in Popular
Electronics. As with many of these stories, real equipment, people, and companies
were referenced; this time it was the Pastoriza Personal Analog Computer, a modular
electronics system for calculating differential equations. The cost was around $300
(~$2,700 in c2021 money per BLS Inflation Calculator). Analog Devices bought the
company from James Pastoriza in 1969. What does the Pastoriza computer have to do
with the story, you might ask? Nothing, really; it was mentioned in a discussion
Carl and Jerry had when accepting a calculating speed challenge from obnoxious dormitory
mate, Bruce. Jerry would add a series of numbers on his soroban while Bruce would
add them with a pencil and paper. The winner got bragging rights...
 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 object has been built to fit proportionally on the provided
A-, B- and C-size drawing page templates (or can use your own). Stencils 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...
 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.
Sunday the 24th
 This
Science
Theme Crossword Puzzle for October 24 has many words and clues related to RF,
microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and
other technical subjects. The letter "P" figures Prominently in this crossword.
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!
 Innovative Power Products (IPP) has over
30 years of experience designing & manufacturing RF & microwave passive
components. Their high power, broadband
couplers, combiners, resistors, baluns, terminations
and attenuators are fabricated using the latest materials and design tools available,
resulting in unrivaled product performance. Applications in military, medical, industrial
and commercial markets are serviced around the world. Please take a couple minutes
to visit their website and see how IPP can help you today.
Friday the 22nd
 A year after the two atom bombs were dropped
to end World War II, the newly formed Atomic Energy Commission conducted detailed
detonation tests at the Bikini Atoll, in the South Pacific. Most people more than
40 years old are very familiar with the images of the giant mushroom cloud that
formed over the site. This "Radio
in the Atom Tests" article from the July 1946 issue of Radio-Craft
magazine reports on plans being made for measure and record sound pressure, nuclear
radiation, radio and radar signatures, temperature, light spectrum and intensity,
and other parameters. The information would be used for improved bomb making, nuclear
power generation, medical imaging and treatment, and general research on nuclear
fission and fusion (a fission implosion is to initiate a fusion reaction)...
 "Researchers from King Abdullah University
of Science & Technology have proposed a solution to address the widespread public
concern about electromagnetic fields (EMF) exposure from mobile networks. Masters'
student Zhengying Lou, postdoctoral student Ahmed Elzanaty and distinguished professor
Mohamed-Slim Alouini of KAUST proposed that mobile
tethered drones might offer a speedy and environmentally friendly alternative
for receiving terrestrial base stations while alleviating public concerns about
exposure to EMF. Ahmed Elzanaty stated that it is mainly a problem of perception,
but this concern has led to attempts to destroy signaling towers, especially those
associated with the 5G network. He does point out, however, that recent experiments
on animals link some adverse health impacts with long-term exposure to EMF..."
 The Civil Aeronautics Administration (CAA),
born in 1940 and now known as the Federal Aviation Administration (FAA, since 1958),
was established originally to regulate the burgeoning commercial airline and cargo
transport air traffic as well as the private aviation activity. According to an
FAA document, on April 3, 1947, CAA controllers began in-service evaluations of
the
ground approach control (GCA) radar system at Washington National and Chicago
Municipal airports. It was commissioned for official use by the CAA on January 7,
1952, at Washington National Airport. This story from a 1957 edition of Radio &
Television News magazine reports on the system upgrade to long-range radars that
would permit, eventually, continuous coverage across the entire USA...
 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.
 Commercially available radio receivers for
the home had only been around for a couple decades when this advertisement from
Crosley appeared in a 1932 issue of Radio-Craft magazine. I keep looking
in old electronics magazines for an ad featuring my 1941 Crosley model 03CB console
radio, but thus far with no luck. There is a chance, although I have not seen any
direct evidence of it, that the 03CB chassis was sold as a special upgrade to the
less ornate 02CA model. What makes it special is that it was probably one of the
last new radios sold prior to the shift of material usage to military equipment
in World War II...
 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.
 Since 2003, Bittele Electronics has consistently
provided low-volume, electronic contract manufacturing (ECM) and turnkey PCB assembly
services. It specializes in board level turnkey
PCB assembly
for design engineers needing low volume or prototype multi-layer printed circuit
boards. Free Passive Components: Bittele
Electronics is taking one further step in its commitment of offering the best service
to clients of its PCB assembly business. Bittele is now offering common passive
components to its clients FREE of Charge.
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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