|
 Details of ancient Parthian
electrochemical batteries unearthed near Baghdad by archaeologist Wilhelm Konig,
dating over 2,000 years, was reported in this 1964 Popular Electronics
magazine article. Housed in earthenware jars sealed with asphaltum (bitumen), they
featured a copper cylinder soldered with 60/40 tin-lead alloy - identical to modern
electronics, prior to PB-free mandates - encasing a corroded iron rod for electrodes,
enabling electroplating of gold, silver, and antimony via electrolytes like copper
sulphate, ferrocyanides, or lye. GE engineer Willard F.M. Gray replicated them successfully
for Pittsfield's Berkshire Museum, using iron rods for series connections. More
cells surfaced in a Seleucia magician's hut and Berlin Museum...
 It seems most of the articles we see on
the subject of attenuator pads are based on signal reduction in terms of decibels
for units of power. Although it is a simple matter to convert power decibels to
voltage decibels, it would be more convenient if you are working with voltage to
have formulas and tables of values based on voltage ratios. This article does just
that. As a reminder, the decibel representation of a ratio is always 10 * log10 (x).
If you have a voltage ratio of V1/V2 = 0.5, then
10 * log10 (0.5) = -3.01 dB. If you have
a power ratio of P1/P2 = 0.5, then 10 * log10 (0.5) = -3.01 dB.
Does that mean that -3.01 dB of voltage attenuation is the same as 3.01 dB
of power attenuation...
 This might be a perfect application for
QuentComm. "Researchers led at the University
of Science and Technology of China (USTC), have achieved a major milestone in quantum
communication. For the first time, they demonstrated a key component required for
scalable quantum repeaters, which later allowed them to carry out device-independent
quantum key distribution (DI-QKD) across 100 kilometers. The results, published
in Nature and in Science, represent important progress toward building a functional
quantum internet. The work also reinforces China's position at the forefront of
quantum research and technology..."
 This Radio Service Data Sheet for the Clarion
"Replacement" Chassis, Model AC-160 A.V.C. Superhet is an example of the dozens
of similar schematic and alignment instruction sheets that have been posted on RF
Cafe over the years. Obtaining technical information on most things, even readily
available items, prior to the Internet era was often very difficult - if not impossible.
Service centers had what was need provided by manufacturers and distributors, but
if you wanted to find a part number or service data on a refrigerator, radio, lawn
mower, garage door opener...
 Remember the test patterns that used to
be broadcast by over-the-air broadcast stations that were used to align the electron
beam defection circuitry in CRT-based televisions? That pattern of squares, circles,
parallel and radial lines was generated by a special tube called a "Monoscope" on the transmitter end. Focus, 4:3 picture aspect ratio,
linearity, frequency response, and contrast and brightness were all tweaked to optimize
the pattern on the TV receiver circuitry. Of course not all sets were capable of
obtaining a perfect alignment due to inferior design and/or a scheme by the manufacturer
to provide a lower cost model with the tradeoff being a poorer picture - that it
the type of TV we always had in our household as...
 Anritsu has been a global provider of innovative
communications test and measurement solutions for more than 120 years. Anritsu manufactures
a full line of innovative components and accessories for
RF and Microwave Test and Measurement
Equipment including attenuators & terminations; coaxial cables, connectors &
adapters; o-scopes; power meters & sensors; signal generators; antenna, signal,
spectrum, & vector network analyzers (VNAs); calibration kits; Bluetooth &
WLAN testers; PIM testers; amplifiers; power dividers; antennas. "We've Got You
Covered."
 Dave Harbaugh created a great many electronics-themed
comics back in the 1960s for magazines like Popular Electronics, QST,
"73", and others. His "Hobnobbing
with Harbaugh" series usually depicted hobbyists and technicians in a state
of surprise and/or dismay over some event while in the act of pursuing his passion
(electronics, that is, not a woman). Although I have never run across any evidence
of it, I wonder how many of the scenarios are derived from personal experience.
Many do not have captions. I have to admit to being stumped at what he is trying
to convey in the comic where the guy is staring into the back of the TV while his
wife...
 Competition amongst countries and businesses
existed long before the advent of radio receivers. Here is an interesting story
which demonstrates how international politics and corporate policies has been part
of the electronics industry since its inception. In order to circumvent what were
considered to be outlandish patent licensing fees, Danish engineer Carl Arne Scheimann
Jensen developed a new "gridless" type of vacuum tube (aka valve) which was called
the "Renode." Rather than using a screen grid in the path between the
cathode and plate, the Renode employed two sets of beam concentrator and deflector
plates on either side of the electron beam's path to modulate the conduction. According
to measurements it provided a slight improvement in both linearity and selectivity...
 "Sixth-generation wireless networks, or
6G, are expected to achieve terabit-per-second speeds using terahertz frequencies.
However, to harness the terahertz spectrum, complicated device designs are typically
needed to establish multiple high-speed connections. Now research suggests that
advanced topological materials may ultimately help to achieve such links. The experimental
device the researchers have made, in fact, achieved 72 gigabits-per-second data
rates, and reached more than 75% of the three-dimensional space around it. Current
solutions typically achieve only one or two of these features at a time and often
rely on complex
antenna arrays or mechanical steering..."
 This week's
RF & Microwave Companies crossword puzzle includes the names
of all my current advertisers and a few others that will be familiar to many of
you. These kinds of puzzles take a particularly long time to create because of needing
to force words into certain positions. That leaves the software with fewer options
for fitting the other words. All the words in RF Cafe crossword puzzles are relevant
to engineering, science, mathematics, etc., stored in a hand-built (over more than
two decades) lexicon of thousands of terms and clues. Enjoy...
 Mystery stories were broadcast on radio
stations in the days before television - and for quite a while after TV was available
for that matter. Families gathered around the living room radio set in excited anticipation
of the next adventure of shows like "The Shadow," "Amos 'n' Andy," "Tales of the
Texas Rangers," "Dragnet," and "The Green Hornet." During that era, it was common
also for electronics magazines, which focused largely on radio communications, to
experiment with printed dramas that had a radio-centric theme. Here is the first
of a series tried by Radio-Craft magazine in the late 1930s. A couple decades
later the Carl & Jerry adventures were run in Popular Electronics,
but other than that I don't recall seeing a lot of these things...
 Diode characteristics and their applications
have not changed fundamentally since this article was published in 1952. Sure, the
die are smaller, power handling and frequency range has increased, package styles
are greatly expanded, and the cost per unit is way down, but if you are looking
for some basic diode information, you will find it here in this 4th installment
of a multi-part series in Radio & Television News magazine. Don't let
the vacuum tubes in schematics scare you off and think that it makes the story irrelevant
for today's circuits. For purposes of illustration substitute a transistor's collector
(or drain) for the tube's plate, a transistor's base (or gate) for the tube's screen
grid, and a transistor's emitter (or source) for the tube's...
 The term "drone"
these days for most invokes the image of a little plastic spider-looking thing with
propellers mounted at the ends of the arms - usually with a toothless bumpkin at
the controls. Those same people often think drones are relatively new devices. People
with a just a little more information automatically classify all radio control (R/C)
models, be they traditional fixed-wing aircraft or helicopters, as drones. Pilots
of the aforementioned models are even likely, per observers, to have all their teeth
and bathe regularly. I happen to be one of the latter type R/C modelers and while
I no longer possess all 32 teeth I had at birth, I do bathe regularly. Drones have
been around since World War I where they were used for target practice by ground-based
mark...
 "If you have dark eyes and blonde hair.
and are under 30, you're due for some easy squeezing. Milligan's Appliance Center,
84 Main Street, is giving every girl between 16 and 30 who has these striking features
a newly patented orange squeezer, to introduce the new item ... Note: Any traces
of recent peroxide rinse will disqualify applicants." That is advertising copy offered
as an example effective promotional material in a 1947 edition of
Radio News. My first reaction was to think how something
like that would never fly today, but then I wasn't so sure. It seems there must
be anti-discrimination laws in this "offend nobody" climate today...
 Imagine having a serviceman of any sort
arrive at your house, fix your problem, and present you with a bill of $6 - parts
included. He would walk away satisfied that he had done a good job and was well
compensated for the work considering the effort invested in training and qualification.
$6 in 1932, per the Bureau of Labor Statistics'
Inflation Calculator is worth $135.97 in 2015 money - that's a
cheap service call even in today's economy. Further, the $14 stated as a day's earnings
is $317.26 in 2025, which equates to 50 (work weeks/year) x 5 (days/week) x $243.86
(/day) = $79,315 (/year) - not too shabby. Just between you and me, that's more
than I'm currently making per year running RF Cafe...
 Aegis Power Systems is a leading supplier
of AC-DC and DC-DC power supplies
for custom and special applications. Aegis has been designing and building highly
reliable custom power supplies since 1995. They offer a complete line of switch
mode power supplies and power converters for a variety of markets including defense,
industrial, aircraft, VME, and telecom. Supports military, aircraft, EV, telecom,
and embedded computing applications. Design and manufacture of custom power supply
solutions to meet each customer's exacting specifications. Please visit Aegis Power
Systems today. Manufactured in the USA.
 Oscillators were never my forte. My biggest
exposure to oscillators was unintentional oscillations in amplifier circuits ;-(
. This
Oscillator Quiz, published in the November 1962 issue of Popular Electronics
magazine, would embarrass me if I attempted to complete it. Therefore, I will simply
state that I highly regard your oscillator prowess if you do better than 50% on
it. I guessed correctly at a couple of the more familiar circuits, but cannot even
make an educated guess at most of them. Don't let the presence of vacuum tubes scare
you off; mentally replace them with a FET and move on...
 These letters represent an unfriendly exchange
between The Electrical Experimenter editor Hugo Gernsback and Dr. K.G.
Frank, of the Telefunken System of Wireless Technology, of Germany. Gernsback correctly
accused Dr. Frank of engaging in espionage for Germany and against the United
States of America, during World War I at a time we were not officially at war
with the Axis powers. He was arrested and interred for the duration of the war for
sending out "unneutral
messages" from the broadcast station at Sayville, Long Island, New York. See
"Radiobotage" in this month's (September 1941) editorial...
 "There's an interesting development in amateur
ballooning: using so-called
superpressure
balloons, which float high in the atmosphere indefinitely rather than simply
going up and up and then popping like a normal weather balloon. Superpressure balloons
can last for months and travel long distances, potentially circumnavigating the
globe, all the while reporting their position. You might imagine that an undertaking
like this would be immensely difficult and cost thousands of dollars. In fact, you
can build and launch such a balloon for about the cost of a fancy dinner out. You
just have to think small! That's why amateur balloonists call them pico balloons.
The payload of a pico balloon is so light..."
 Many of the words in this week's
crossword puzzle pertain to radar engineering. All the rest of
the words are related to technology, engineering, science, mathematics, aeronautics,
ham radio, chemistry, etc. There are no names of Hollywierd actors, shoe designers,
or romance novel titles. I will be glad to create a special edition crossword for
your newspaper, newsletter, etc. Enjoy...
 It's time to gather 'round for another story
about fictional radio service shop owner
Mac McGregor and his trusted sidekick technician, Barney. In this
episode, an errantly wired bypass capacitor on a chassis from one of the old AC/DC
radio sets caused Mac to get a 300-volt wakeup call when his hand brushed against
it. After explaining the situation to Barney and apprising him of the danger it
poses to an owner who unwittingly sticks his/her hand into the back of the cabinet,
Mac lists a few other common dangers to watch for. Radios that ran on either AC
or DC power were very common back in the early days because there were homes and
businesses that had both type systems wired in to the premises - in part due to
the famous battle between Thomas Edison's preferred DC electrical distribution system
and Nikola Tesla's preferred AC electrical distribution system. Another reason for
DC compatibility was that prior to the
Rural Electrification Act of 1936, many...
 An incredibly glaring example of the famous
admonishment* that those who ignore history are condemned to repeat it, Radio-Craft
editor Hugo Gernsback wrote in May of 1941, a full half year before the United States
of America officially entered World War II, about how current conditions regarding
domestic commercial radio broadcast stations were likely being used by German agents
to send coded messages to offshore vessels (ships, submarines, and aircraft).
In example, he cited, amazingly, an article he himself published in 1915 in
The Electrical Experimenter accusing Dr. K. G. Frank, of the German Telefunken
company, of conducting spy operations from the Sayville, NY, station on Long Island...
 Considering that not much more than a year
before this article was written that the transistor had been invented, it is impressive
that already Raytheon was producing a commercially available
CK703 "crystal triode." That nomenclature was a natural extension
of the preceding crystal diode already being widely adapted in circuit design. If
you have wondered how the transistor schematic symbol came to be as it is, you will
learn why here where the emitter and collector symbols actually both have arrows
on the ends that contact the base, indicating the "point contact" physical arrangement
of the semiconductor junctions. Shortly thereafter the arrow on the collector port
was eliminated, primarily, I suppose to avoid confusion when the E, B, and C labels
are not present...
 "CDimension recently unveiled a technology
that enables conventional semiconductor fabs to use ultra-thin semiconductor materials
to manufacture vertically integrated arrays of extremely small, fast, and efficient
"2D" transistors. It has the potential to change what's possible for both digital
and power devices. According to the company, it's already helping several chipmakers
explore how to apply their technology to produce digital and analog ICs that offer
dramatically higher logic densities, operating speeds, and energy efficiency..."
 Here are three more Radio Service Data Sheets
added to the online archive. As mentioned many times in the past, I post these for
the benefit of hobbyists looking for information to assist in repairing or restoring
vintage communication equipment. These particular radio models -
Emerson Model 20A and 25A,
Pilot Model B-2,
General Electric Model K-40-A - were featured in a 1933 edition
of
Radio-Craft magazine...
 A lot of RF Cafe visitors might not be familiar
with some of the electronic waveforms presented in this
Oscilloscope Quiz by Popular Electronics magazine's ultimate quizmaster, Robert
Balin. The shapes are recognizable to anyone who has done a lot of design, troubleshooting,
testing, or alignments on analog circuits. Electronics repairmen were intimately
familiar with these - and much more complex - waveforms. Modulation of the z-axis
is especially cool as it varies the intensity of the waveform. I always roll my
eyes when, back in the day, a laboratory or medical facility in movies or on TV
had an oscilloscope display with a Lissajous pattern writhing on the display...
|
 • Fund Opens
Defence Contracts to UK Startups
• Global
Trade Holds Its Ground
• FCC
"Supercharge" Wi-Fi in 6 GHz Band
• Legacy
Memory (DDR2, 3, 4) in Demand but Scarce
• 2026 is
Year of 6G Slop
• FCC to
Exempt Amateurs from Foreign Adversary Reporting
 The
RF Cafe Homepage Archive
is a comprehensive collection of every item appearing daily on this website since
2008 - and many from earlier years. Many thousands of pages of unique content have
been added since then.
 One of the news websites I frequent had a
note about this "Evolution
of Transistor Innovation" video produced by Intel. In a span of five minutes
you are taken on a journey from the early planar MOSFET (metal oxide semiconductor
field effect transistor) days to today's world of 3-dimensional, non-planar FINFET
(fin field effect transistor). Physical layout, materials, and lithography advances
allowed gate lengths to shrink from 12 μm in the early 1970s to a mere 10 nm
by 2020. Switching speeds have gone up, die sizes have gone down, power consumption
per gate has decreased, and reliability has increased. At every juncture we have
been served stories of a certain end to Moore's law (a doubling of gate count every
18-24 months), and thanks to dedicated engineers and scientists the prognosticators
have been proven wrong...
 This
RF Cafe Engineering & Technical Headlines Crossword Puzzle contains at least
10 words from headlines posted on the homepage during the week of September 16 through
September 20, 2019 (marked with an asterisk*). These custom-made engineering and
science-themed crossword puzzles are done weekly for the brain-exercising benefit
and pleasure of RF Cafe visitors who are fellow cruciverbalists. Every word and
clue - without exception - in these RF Cafe puzzles has been personally entered
into a very large database that encompasses engineering, science, physical, astronomy,
mathematics, chemistry, etc. Let me know if you would like a custom crossword puzzle
built for your company, school, club, etc. (no charge).
 Hidden away on page 134 of a 1959 issue of
Electronics World, at the end of a Mac's Service Shop-like electronics
shop docudrama (Another Day in the Shop) is this handy tip on how to fabricate
a make-shift
thermal wire stripper from a soldering gun or a soldering iron. The beauty of
thermal strippers over mechanical strippers is that they do not nick the underlying metal
wire. Heated elements melt the insulation and then a blunt edge is used to slide the
insulation off the end of the wire. Another advantage is that you can strip a wide range
of wire gauges and insulation types without needing to adjust the jaws or change to a
different hole location - although a proper temperature setting is required to avoid
a gloppy, stringy mess...
 Like a fool, many years ago I donated a perfectly
fine
vacuum tube tester that had been given to me by an über-engineer/ham I worked
with during the time (nearly 35 years ago) I was restoring my first vintage tube
radio. Big mistake. It was a really nice tester: a B&K Model 650 Dyna-Quik Dynamic
Mutual Conductance Tube & Transistor Tester. It was sold shortly after I had
also given away as a wedding gift the Crosley floor console radio that I restored.
Another bad move. Now, many moons later, I am working to restore yet another Crosley
tube radio and I sure wish I had held on to it. Similar tube testers are routinely
selling on eBay for $100-$200. I finally found a really nice B&K Model 650 on
eBay and got it for a decent price. Mistake corrected...
 Beginning in the middle of the 1930s, engineering
labs in the U.S. and Europe were experimenting with radar systems. Early radars
did not have the slick plan position indicator (PPI) displays that modern systems
use for plotting target movement for indication of azimuth (direction) and range
(distance). Instead, oscilloscopes showed radar returns as amplitude blips along
a time base that represented range. Azimuth was determined by where the operator
pointed the antenna (rotating versions came later). Since radar cross section stealth
technology had not been invented yet, the amplitude of the signal was useful a measure
of the size of the target. Prior to the invention of radar (RAdio Detection And
Ranging), other means were needed to detect...
 Take a look at the list of
National Company's employee list wishing their customers a Merry Christmas and
a Happy New Year. Every one of them is a licensed Ham radio operator. It appeared
in the January 1942 issue of ARRL's QST magazine, but was for the 1941
Christmas. National Company was a major producer of amateur radio gear in the day.
Little did they suspect when the magazine went to print that by the time readers
received it, America would be newly engaged in World War II after the Japanese
attack on Pearl Harbor on December 7, 1941. Many of the names would be different
in1943 due to employees going off to fight the war in the European, Pacific, and
North African Theaters of Operation...
 QST reader Dave Berman, WA2PAY,
wrote in the March 2020 issue's "Letters from Our Members" column about an episode
of the old "Highway Patrol" television show entitled, "Radioactive,"
wherein the ARRL (American Radio Relay League" is mentioned and Ham radio operator
Pat Conway plays a lead role in the show. Broderick Crawford stars as head highway
patrolman Dan Mathews. I did some screen shots of Mel's shack showing the massive
transmitter cabinet and the receiving station desk. On a table across the room is
a Precision Apparatus Co. E-200-C Signal Generator. Do you recognize any of the
other equipment? Note on the chalkboard that the nuclear scientist has beryllium
misspelled as "berilium," unless he happens to be an Indonesian, in which case it's
OK...
 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, and
more. Page templates are provided with a preset scale (changeable) for a good presentation
that can incorporate all provided symbols...
 Do you remember your first calculator - electronic,
that is (slide rules and abacuses don't count - actually they do, right?)? Mine
was acquired sometime in the fall of 1976 during my first attempt at secondary education
at Anne Arundel Community College in Maryland, where eventually, in 1987, I was
awarded an Associate's degree in Engineering (which constituted the first two years
of my eventual BSEE at UVM in 1989, on whose notable alumni list I am not). My name
is not in AACC's list of notable alumni, either. But I digress. My calculator was
a Texas Instruments model SR-50 that had a small red LED display. It cost about
$100 ($445 in today's inflated money) and performed basic math with a few simple
trigonometric and logarithmic functions. This edition of Mac's Service Shop, entitled,
"Buying
and Using a Pocket Calculator," has Mac telling sidekick Barney about the Hewlett
Packard's HP-45 calculator. According to the Wikipedia entry, the HP-45 entered
the market in 1973 at a list price of $395 ($2,084 today). That's the price of a
high-end gamer's computer these days. Its features were about equal to my $100 SR-50
a decade later. For the budget minded calculator, he also recommended the Unicom
Model 202SR...
 High quality
test equipment (TE) typically costs more than the knockoff stuff, but a lot more
of the former is still around in regular use compared to the latter. The retained value
of vintage TE can be quantitatively measured on eBay - as can most things for that matter.
An item is worth what the market will bear. Hewlett Packard (HP), Tektronix, Bird, Simpson,
B&K, Triplett, even Heathkit, typically sell for often surprisingly high prices when
in working order. Accordingly, a lot of people are looking for specifications on the
older equipment as well as schematics and alignment manuals. A Google search almost always turns
up what you want. The information presented in this 1966 article from
Popular Electronics magazine will probably be found by someone doing just
such a search...
 Unless you are into restoring and/or repairing
radios with
dial cords, you probably can't fully appreciate the humor in this short piece
from a 1953 issue of Radio-Electronics magazine. Dial cord is a type of string that
does not stretch when put under tension. It is wound around the shafts of two or
more components to keep them in step with each other. Since the advent of LED and
LCD readouts for displaying the tuned frequency, there was no need to mechanically
synchronize a sliding or rotating pointer with the position of a (usually) multi-plate
tuning capacitor. If you are/were lucky, the path of the dial cord simply wrapped
around the shaft of the tuning element (capacitor) and around the axle of a circular
tuning dial, with no pulleys or bobbins for changing the direction...
 In the diagram below is shown the foundation
chassis incorporated in a number of superheterodyne receivers manufactured by the
Crosley Radio Corp., Cincinnati, Ohio. It was common for original equipment manufacturers
(OEMs) and third-party companies to offer decorative cabinets (aka consoles) into
which the electronics (chassis, speaker, front panel controls, etc.) are installed.
In the case of this Model 120, is never had a cabinet and was meant to be integrated
into custom cabinets. No photo of the chassis could be found. Note the relative
simplicity of the circuit since there were no accommodations for fancy push-button
tuning and tonal adjustments. Standard consoles are the models Super-Administrator
and Super-Rondeau; while the Super-Sondo console is a radio and phonograph combination.
The "pliodynatron"
was a special vacuum combining the pliotron and the dynatron, as detailed in "The
Saga of the Vacuum Tube - Part 14," published in the November 1944 issue of Radio
News magazine. Vacuum tube V3 performs the pliodynatron function here...
 One aspect of advertising on the RF Cafe
website I have not covered is using
Google AdSense.
The reason is that I never took the time to explore how - or even whether it is
possible - to target a specific website for displaying your banner ads. A couple
display opportunities have always been provided for Google Ads to display, but the
vast majority of advertising on RF Cafe is done via private advertisers. That is,
companies deal with me directly and I handle inserting their banner ads into the
html page code that randomly selects and displays them. My advertising scheme is
what the industry refers to as a "Tenancy Campaign," whereby a flat price per month
is paid regardless of number of impressions or clicks. It is the simplest format
and has seemed to work well for many companies. With nearly 4 million pageviews
per year for RFCafe.com, the average impression rate per banner ad is about 225,000k per
year (in eight locations on each page, with >17k pages)...
 We have all seen news reports about the often
exorbitant
salaries
of government employees as compared to the earnings of folks in equivalent private
sector jobs. According to a March 2012 report by the Bureau of Labor Statistics,
the average total compensation for the average private industry worker was $28.57
per hour worked whereas for the federal government worker it was $40.90 per hour
- a 43% difference! When you look at the ranges of job titles and pay for government
workers as compared to equivalent private industry workers there seems to be no
logical correlation between which jobs pay more with the government versus private
industry. There are currently about 22 million U.S. government employees - a staggering
number indeed. Asbury Park Press recently made available a database (not available
anymore...
 Each month Radio & TV News magazine
contained a section entitled, "What's New in Radio," which reported on some of the
latest happenings in the fields of commercial, military, space, transportation,
broadcast, and all other forms of wireless communications. This 1958 issue show
the world's first volume production airborne digital computer, designed by Hughes
Aircraft Company, installed in the nose of a U.S. Air Force F-102A Delta Dagger
fighter jet (built by Convair). The 456th Fighter Interceptor Squadron website has
a lot of information about the
Hughes MA-1 Digitair computer and its integration with airborne radar to create
a flight control system that could guide aircraft to a target for ordinance (bombs,
missiles) deployment. Other topics included a wideband oscilloscope from Electronic
Industries (EIC) that handled a whopping 5 MHz...
 "Use it up... Wear it out... Make it
do... Or do without" - what a great slogan! It was coined by the War Advertising
Council during World War II to promote the dual need to conserve scarce
resources and to help keep prices down by not generating excess demand. Most of
us have seen videos or read articles about neighborhood materials collection
efforts to round up old tires, scrap metal, glass, tools, electronics equipment,
cloth and clothing, and many other items that could be ...
 Banner Ads are rotated in all locations
on the page! RF Cafe typically receives 8,000-15,000 visits each
weekday. RF Cafe
is a favorite of engineers, technicians, hobbyists, and students all over the world.
With more than 17,000 pages in the Google search index, RF Cafe returns in
favorable positions on many types of key searches, both for text and images.
Your Banner Ads are displayed on average 225,000 times per year! New content
is added on a daily basis, which keeps the major search engines interested enough
to spider it multiple times each day. Items added on the homepage often can be found
in a Google search within a few hours of being posted. If you need your company
news to be seen, RF Cafe is the place to be...
 Since 2000, I have been creating custom
science and technology-themed crossword puzzles for the
brain-exercising benefit and pleasure of RF Cafe visitors who are fellow
cruciverbalists. The jury is out on whether or not this type of mental challenge
helps keep your gray matter from atrophying in old age, but it certainly helps
maintain your vocabulary and cognitive skills at all ages. A database of
thousands of words has been built up over the years and contains only clues and
terms associated with engineering, science, physical, astronomy, mathematics,
chemistry, etc. You will never find a word taxing your knowledge of a numbnut
soap opera star or the name of some obscure village in the Andes mountains. You
might, however, encounter the name of a movie star like Hedy Lamarr... |
