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4 of the November
2022 homepage archives. Monday the 21st
 As I have noted before,
Sams PhotoFacts were the indispensible gold standard for commercial electronics
service documentation from the 1940's through maybe the 1980's. After that, there
was not nearly as much of a demand for electronics servicing because most electronic
products in the consumer market were fully transistorized and had a high level of
integrated circuit (IC) components, and multi-layer printed circuit boards (PCB's).
That made serviceability more difficult for both professionals and DIY repairmen.
Steep price decreases and very rapid evolution of features resulted in most people
opting to throw away broken radios, televisions, phonographs, etc., rather than
pay to repair them. The death knell of serviceability was when fly speck size surface
mount components dominated PCB assemblies. Sams PhotoFacts were for the era when
vacuum tubes (and even transistors and IC's) were plugged...
 "Could you explain a complex concept from
quantum physics in just three minutes - and hold the attention of your audience
while you did it? This was the premise of the inaugural 'Quantum
on the Clock' competition, which challenged A-level and equivalent students
from across the UK and Ireland to create creative, clear, engaging and accurate
short videos on any aspect of quantum science and technology. The winners of the
competition received cash prizes donated by quantum companies and institutions,
plus an expenses-paid trip to the Photon 2022 conference in Nottingham..."
 Empower RF Systems sets the bar for
extreme high-power solid state COTS amplifiers. The Model 2236 is liquid cooled
and combines the output of two six foot cabinets with each cabinet combining sixteen
2U power amplifiers. Lower and higher power versions of this amplifier are available
due to the scalable, modular design. Operating from 2800 to 3500 MHz, the flexible
pulse handling capabilities of this fielded system includes 20% duty cycles with
pulse widths from 200 ns to 500 us and PRFs up to 500 kHz. The 2236
is designed for lower total cost of ownership and higher availability than TWTs
and legacy solid state implementations. The transmitter consists of a system controller
in a 3U 19-inch rack unit and a total of thirty two 2U 19-inch rack amplifier drawers
with each amplifier drawer containing an integrated power supply in its 2U chassis...
 At my request, Dmitriy provided a few additional
screen shots of RF / microwave type functions for his
Circuit Calculator
app for Android phones. There are 170+ circuits for design, 50+ electronics
calculators, 20+ application notes, and a logic solver. The Power Stage Design Tool
is for switch mode power supplies. Filter Designer handles multi-stage analog active
filters, and there is a stand-alone Resistors app. He even has a Cost, Please! app
for tracking travel-related costs. I could be wrong, but it appears most of the
capability of the other two design apps is included in Circuit Calculator. All apps
work offline without an Internet connection. Files sizes are significantly smaller
than similar apps. Does the world need yet another circuit design app when so many
already exist, you might ask? According to Dmitriy: "There is a list of well-known
electronics design tools for Android which can be found in every review for the
last 10 years: 'Electrodoc,' 'Every Circuit,' 'Droid Tesla,' 'Electronics Toolbox,'
'RF & Microwave Toolbox,' and so on. Also, there is a lot of trash on the market
that turns finding a good tool into a quest..."
 Here are a few tidbits of breaking electronic
communications news from a 1940 issue of National Radio News magazine (a publication
of the National Radio Institute). "Mayday" had evidently recently been adopted as
the preferred distress call rather than "SOS" or even "Help!" For some unknown reason
a radio owner desperate to get his set working again dragged a potato across the
top of a vacuum tube and it suddenly started receiving the local station. An employee
of Edison Company of NYC devised a "storm detector" for warning of potential lightning
strikes in the area (possibly akin to the classic silk thread and pith ball bell
ringer devised by Benjamin Franklin?). In other news, "long life" vacuum tubes were
announced that would last up to 4½ years, and some police departments were finally
receiving portable radios. It was an exciting time!
 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 12,000 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.
Sunday the 20th
 Here is your custom made
Electronics Themed crossword puzzle for Thanksgiving Day, 2022. All RF Cafe
crossword puzzles are custom made by me, Kirt Blattenberger, and have only words
and clues related to electronics, electricity, radio, radar, 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!
 This assortment of custom-designed themes
by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins,
Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's
Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart."
My "Matchmaker's" design has been ripped off by other people and used on their products,
so please be sure to purchase only official RF Cafe gear. My markup is only a paltry
50¢ per item - Cafe Press gets the rest of your purchase price. These would make
excellent gifts for husbands, wives, kids, significant others, and for handing out
at company events or as rewards for excellent service. It's a great way to help
support RF Cafe. Thanks...
 Windfreak Technologies designs, manufactures,
tests and sells high value USB powered and controlled radio frequency products
such as RF signal generators, RF synthesizers, RF power detectors, mixers, up /
downconverters. Since the conception of WFT, we have introduced products that have
been purchased by a wide range of customers, from hobbyists to education facilities
to government agencies. Worldwide customers include Europe, Australia, and Asia.
Please contact Windfreak today to learn how they might help you with your current
project.
Friday the 18th
 Maybe in 1951 when this "Corrugated-Waveguide
Band-Pass Filters" article appeared in Electronics magazine, placing a special
resonating form inside a section of waveguide was a reasonable option for creating
a bandpass filter response, but it sure seems like a hard way of accomplishing the
task. As shown in the photo and illustrations, a tapered metallic block with machined
fins spaced to resonate at a predetermined frequency created a high frequency cutoff
to work in conjunction with the natural low frequency cutoff frequency to create
a bandpass combination. A quick search did not turn up any references to such structures
being used in modern waveguide bandpass filters, although they might exist. It appears
iris coupling of resonating cavities is the method du jour. I admit to not being
a waveguide expert, so do your own research on this one. If nothing else, this is
a good historical reference...
 Skyworks Solutions is introducing an
isolated gate driver reference design that operates with Wolfspeed's Silicon
Carbide (SiC) Field Effect Transistor (FET) power modules With the growing adoption
of SiC for power conversion and inverter applications - fueled by consumer demand
for greater range, faster charging and more efficient propulsion for electric vehicles
(EVs) - there is an increasing need for gate drivers that are optimized for SiC
FETs. The new Si828x gate driver board (GDB) kit from Skyworks simplifies design
and enables increased integration for automotive applications by replacing competing
designs with more complex gate driver board layouts. Skyworks Si828x gate driver
board (GDB) kit. What: Designed and tested for Wolfspeed XM3 SiC FET modules and
instantiated on an evaluation board, the Skyworks Si828x GDB kit keeps high voltage/high
current...
 Centric RF is a company offering from stock
various RF and
Microwave coaxial components, including attenuators, adapters, cable assemblies,
terminations, power dividers, and more. We believe in offering high performance
parts from stock at a reasonable cost. Frequency ranges of 0-110 GHz at power
levels from 0.5-500 watts are available off the shelf. Order today, ship today!
Centric RF is currently looking for vendors to partner with them. Please visit Centric
RF today.
 "Whenever some science fiction movie or
TV show is intended to appear 'ultra-scientific,' or when a sponsor wants to clinch
his sales pitch with some phony-technical display, chances are that an oscilloscope
will be shown with a modulated wave pattern jumping around on the screen." Funny
that this was going on back in 1957 when this article appeared in Popular Electronics
magazine, and that it still occurs today. How many modern sci-fi movies or techie
action movies have you seen that still show
Lissajous patterns squirming around on oscilloscope screens? The only difference
is today's hoaxes have rectangular displays whereas the old ones used round displays...
 "Frequency
combs are key to optical chips that could cut Internet power consumption. A record-breaking
optical chip can transmit 1.8
petabits per second, roughly twice as much traffic as transmitted per second
over the entire world's Internet, a new study finds. Previous research transmitted
up to 10.66 petabits per second over fiber optics. However, these experiments relied
on bulky electronics. A compact microchip-based strategy could enable mass production
and result in smaller footprints, lower costs, and lower energy consumption. Until
now, the fastest single optical microchip supported data rates of 661 terabits per
second..."
 Commercially available test equipment for
hobbyists in the 21st century is pretty high quality at a relatively low price,
so the motivation for buying parts and building your own
RF power meter has to be driven not by cost, but by a desire to gain the experience.
This 1958 Popular Electronics magazine article presents a simple RF power
meter that can be built for about $25 worth of parts. All the parts should be readily
available except for the Raytheon CK-721 (or CK-722) germanium PNP transistor. The
2N3906 and the 2N2907 have been suggested as replacements, but some changes in the
biasing resistors might be required...
 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!
 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.
Thursday the 17th
 Who knew that Willie Nelson was, in addition
to being a top country music star, was also an electronics expert? This article
from the December 1965 issue of Electronics World included a feature by William
Nelson entitled "Cryogenics
in Electronics." OK, so it's probably not the same guy. Per the kTB equation
governing the power level of thermal noise in a given bandwidth, thermal noise needs
to be as low as possible to enable the smallest possible radio signal. "k" is Boltzmann's
constant (1.3806503 × 10-23 m2 kg s-2 K-1), "T" is the temperature in Kelvins, and
"B" is the bandwidth (BW) in hertz. If the required BW is fixed, and K is fixed,
then T needs to be lowered below the ambient temperature. Cryogenics are required
to do the job for meaningful results. Requirement for space exploration and space
communications motivated a large scale effort to design extremely high sensitivity
receivers...
 RF Cafe visitor Dmitriy recently wrote to
let me know about the extensive suite of electronics circuit design apps he created
for Android smartphones. There is the
Circuit Calculator
app with 170+ circuits for design, 50+ electronics calculators, 20+ application
notes, and a logic solver. The Power Stage Design Tool is for switch mode power
supplies. Filter Designer handles multi-stage analog active filters, and there is
a stand-alone Resistors app. He even has a Cost, Please! app for tracking travel-related
costs. I could be wrong, but it appears most of the capability of the other two
design apps is included in Circuit Calculator. All apps work offline without an
Internet connection. Files sizes are significantly smaller than similar apps. Does
the world need yet another circuit design app when so many already exist, you might
ask? According to Dmitriy: "There is a list of well-known electronics design tools
for Android which can be found in every review for the last 10 years: 'Electrodoc,'
'Every Circuit,' 'Droid Tesla,' 'Electronics Toolbox,' 'RF & Microwave Toolbox,'
and so on. Also, there is a lot of trash on the market that turns finding a good
tool into a quest..."
 I was surprised to not find in this story
any mention of military training as a possible pathway to a career in electronics.
1948, when this article appeared in Radio & Television News magazine,
was a year when a plethora of highly trained and competent cadre of
electronics technicians were available for exploitation by commercial industries.
During the years of World War II, which came to a close in the Fall of 1945,
most research, development, and production of high tech equipment resulted in major
advancements in radio, television, radar, teletype, medicine, and creature comforts
was operated and maintained by service personnel. Immediately after the war and
even for many months prior to the surrenders of Germany and Japan, when the outcome
became apparent, many commercial companies began training programs for accommodating
a new era of technology for the civilian community...
 ConductRF's LSA series of
Low Loss, Performance flexible RF cable assemblies, provide microwave system
designers with a versatile solution for most applications, and are available immediately
from DigiKey. Here we offer customers a solution for 0.086" dia. cable that facilitates
greater flexibility and handling or, 0.141" dia. that exploits the same great performance
but with almost half the loss. Connector options include SMA, Type-N, TNC &
SMP that provide excellent VSWR between DC and 18 GHz, also solutions for MCX &
SMB are available in a wide array of configurations. These assemblies are built
using our own double shielded, FEP jacketed cable, that was developed specifically
for performance solutions. With shielding effectiveness exceeding 90 dB through
18 GHz, these cables minimize the threat of cross-talk effect...
 The advent of
selenium rectifiers in the 1940s was a very welcome new option to circuit designers,
consumers, and servicemen. Before that, vacuum tubes did the job (with some use
of copper oxide rectifiers). Selenium rectifiers have the advantage of ruggedness
and reliability over tubes (~85% vs. ~60%, respectively). Not requiring a heater
voltage eliminates needing to create heat in excess of that dissipated due to the
innate inefficiency. Voltage and power handling is adjusted by stacking appropriate
layers and adjusting the physical size, respectively. A failed selenium rectifier
reportedly often emitted a very foul odor, which although offensive to the user,
proved to be a nice bonus for the serviceman since it immediately gave a clue as
to what went wrong...
 With more than 1000
custom-built stencils, this has got to be the most comprehensive set of
Visio Stencils available for RF, analog, and digital system and schematic
drawings! Every stencil symbol has been built to fit proportionally on the included
A-, B-, and C-size drawing page templates (or use your own page if preferred). Components
are provided for system block diagrams, conceptual drawings, schematics, test equipment,
racks (EIA 19", ETSI 21"), and more. Test equipment and racks are built at a 1:1
scale so that measurements can be made directly using Visio built-in dimensioning
objects. Page templates are provided with a preset scale (changeable) for a good
presentation that can incorporate all provided symbols...
 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."
Wednesday the 16th
 This
iron core inductance design chart was included along with an article in the
November 1946 issue of Radio-Craft magazine entitled, "Coils, Cores and Magnets."
Iron-core inductors, with their high permeability and loss factor (due to eddy currents),
can only be used in power supply filtering, audio, and other relatively low frequency
(<~500 kHz) applications. Ferrite cores are compressed from slurries of
iron, nickel, cobalt, and other metallic elements, all of which experience lower
eddy current losses because they are generally not electrically conductive. With
lower permeabilities, ferrites can operate into the few hundreds of MHz realm. Physical
configuration of the core and conductors wrapped around the core can have a large
influence on the electrical parameters of power loss, impedance, frequency of operation,
linearity (due to saturation), heat dissipation...
 Electronic Design has the Compensation
portion of the
2022 Salary & Career Survey. Along with charts with numbers, it also presents
how survey respondents felt about their compensation, what kinds of bonuses were
received, and the current state of the engineering shortage. 70% report they had
greater compensation in the last year, but less that ¼ will beat out the
massive inflation rate, so effective earnings are less than the previous year. About
64% get paid between $100k and $200k per year. 10% are above $200k. I'm in the remaining
26% (advertise on RF Cafe or buy my stuff to help fix that
). Median bonuses are $2k-$3k (pretty lame, really). 2/3 of engineers believe
they are adequately compensated - a good thing. See the entire report...
 Connecting a diode backwards across a solenoid
coil to shunt potentially damaging current and/or voltages when the supply is turned
off is a common trick for saving connected circuitry. Depending on the magnitude
of the magnetic field and how quickly the field collapses, some really high voltages
can be produced. In fact, the ignition coil and point (now solid state) system in
exploits exactly that principle to turn the 12 volts from your car battery into
20-40 kV for firing the spark plugs. Engineers that designed this early
cyclotron
had limited options for what to use given the state of the art in the early 1940s,
and chose to keep the generator permanently connected to the coil (no switch) so
that if the controller failed, the coil's energy 15 kgauss magnetic field)
would flow back into the generator. That, of course, is the equivalent of refrigerator
magnet compared to magnetic fields set up by the Large Hadron Collider (LHC) in
the EU in search of the Higgs boson...
 The municipal water supply here in Millcreek,
PA, leaves a bad taste in my mouth - literally. It's hard to make a good cup of
coffee with bad water, so I decided to install a high quality water filter. The
water pressure for the supply line is pretty good, so I figured that pressure reduction
due to the filter's presence would not be too bad. I was wrong. In retrospect, this
was not really a surprise since I have installed the same type of filters in other
houses and had a reduction, but the street pressure is higher here so I thought
the output would be high enough. After about two years of having about half the
water flow from the cold water faucet as from the hot, I decided to do something
about it. Changing the filter helped a bit, but not much. So, I figured it was time
to test the theory of equivalency between water pressure and electromotive force
pressure (voltage) when applied through
parallel resistances. In this case the resistance is provided by the water filters
and the pressure is provided by the town's water supply. The picture below shows
how I accomplished the plumbing (equivalent of wiring in an electrical circuit).
A couple "T" fittings provided the connection nodes. The water supply can be thought
of as the positive terminal of a battery (anode) and the sink's drain can be considered
the negative terminal (cathode). Theoretically, if each filter dropped the output
pressure by a half...
 Picocom, the 5G Open RAN baseband semiconductor
and software specialist, today announced that SOLiD, a global leader in cellular
in-building mobile coverage, has selected Picocom silicon and software to power
its next generation of
5G Open RAN Radio Units (O-RUs). Picocom PC802, 5G Open RAN Radio Units (O-RUs)
"SOLiD is at the forefront of, and continues to be committed to, being a worldwide
leader in in-building cellular technology. Partnering with Picocom to purchase PC802
devices and license its 5G NR O-RU software gives us the confidence that SOLiD will
maintain the edge over our competition. This agreement will enable us to be competitive
in the ever-evolving Open RAN market with our next-generation O-RUs," said HyunChae
Kim, Vice President at SOLiD...
 Here is a batch of
electronics-themed comics that appeared in the January 1945 edition of Radio
News magazine. The editors must have been frisky and into the holiday spirit(s)
when choosing comics that month. You'll see what I mean. Marvin Townsend, one of
the artists, was a frequent contributor to electronics magazines. As with Townsend
and those drawn by Frank Beaven and others, you can usually tell who drew the comic
by the character forms. There is a huge list of other comics at the bottom of the
page...
 Alliance Test Equipment sells
used / refurbished
test equipment and offers short- and long-term rentals. They also offer repair,
maintenance and calibration. Prices discounted up to 80% off list price. Agilent/HP,
Tektronix, Anritsu, Fluke, R&S and other major brands. A global organization
with ability to source hard to find equipment through our network of suppliers.
Alliance Test will purchase your excess test equipment in large or small lots. Blog
posts offer advice on application and use of a wide range of test equipment. Please
visit Allied Test Equipment today to see how they can help your project.
RF Cascade Workbook is the next phase in the evolution of
RF Cafe's long-running series, RF Cascade Workbook. Chances are you have
never used a spreadsheet quite like this (click here for screen capture). It is a full-featured RF system
cascade parameter and frequency planner that includes filters and mixers for a mere
$45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch
and the format is entirely customizable. It is significantly easier and faster than
using a multi-thousand dollar simulator when a high level system analysis is all
that is needed. An intro video takes you through the main features...
Tuesday the 15th
 The trend toward solar power is nothing
new. Engineers and scientists have been working for decades to
develop photovoltaic (PV) cells for converting sunlight into electricity. The
challenge has been primarily a semiconductor compound and construction issue. Modern
high efficiency solar cells are not the simple silicon types of yesteryear. Modern
PV cells use a complex mixture of atoms and die layer configurations. The process
for today's most efficient examples is difficult and expensive. There is also the
problem of degrading performance over time with continued exposure to sunlight and
environmental contamination (dust, dirt, rain, pollution chemicals, etc.). Newly
installed array systems might boast 20%-25% efficiency, but five years later it
is down measurably. After a decade and longer things can get really bad. This Bell
Telephone Labs infomercial from a 1956 issue of Radio-Electronics magazine show
a lineman installing a "solar battery" atop a pole...
 Rohde & Schwarz offers a huge selection
of products and services to the RF, microwave, and wireless industries free of charge.
Posters, Pocket Guides, whitepapers, equipment manuals (many of which include extensive
tutorials and equations), etc., can be downloaded from their website. Webinars are
available for a wide variety of topics. For a nominal fee, online courses from their
Technology Academy such as
RF & Microwave Basics ($190),
RF & Wireless Transceiver System Architectures ($120), and
RF & Microwave Connector Types and Connector Care ($120) can be attended.
High priced courses targeting specific industry topics like
Automotive Radar - Basics, Technology and Test Equipment ($780) are also available.
Aside: R&S just informed me that a new version of the
Radar & Electronic Warfare Pocket Guide.
 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.
 As a rule, I do not spend much time wondering
what other engineering websites are doing or what their visitor traffic might be.
Instead, I spend my time creating a format and content that caters to the needs
of RF Cafe visitors - engineers, technicians, students, hobbyists, researchers,
etc. I do not use pop-up windows for ads, announcements, cookie warnings, or anything
else. I have never betrayed the trust of visitors by selling or trading their IP
addresses, e-mail addresses, or any sort of statistical data. Doing so is rewarded
with a good flow of website traffic. The graphs are screen captures from the SEMRush
webpage. The results were a bit surprising in some instances, but expected in others.
For reference, RF Cafe gets an average of 29,539 "organic traffic"/month. By
comparison, the IEEE website has 2,879,641/month (97x more). The ARRL website sees
146,616/month (49x). Microwave Journal is at 5,916/month (1/5th). Microwaves & RF
shows 9,366/month (1/3rd). Two what might be considered competitor websites, everythingRF
and Microwaves101, are at 164,110/month (5x) and 24,750/month (7/8ths), respectively...
 Here is a great look inside the planning
and operation of the "Minitrack" systems used for
Project Vanguard to track the Sputnik, Echo, Explorer, and other early Earth
artificial satellites during the International Geophysical Year (IGY) activities.
From a 1957 issue of Radio & TV News magazine: "Essentially, the [IBM 704's]
storage function works by means of doughnut-shaped cores, about the size of pinheads,
which are strung on a complex of wires in such a way that several wires pass through
each core. Combinations of electrical impulses on these wires alter the magnetic
states of the cores. A line of cores, some magnetized and some neutral, represents
a number or other collection of symbols in much the same way as a combination of
dots and dashes stands for a word in Morse code. Up to 32,768 of these 'words' can
be stored in the 704's high-speed magnetic core memory. Additional 'words' can be
held..."
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 12,000 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.
 RF Superstore launched in 2017, marking
the return of Murray Pasternack, founder of Pasternack Enterprises, to the RF and
microwave Industry. Pasternack fundamentally changed the way RF components were
sold. Partner Jason Wright manages day-to-day operations, while working closely
with Mr. Pasternack to develop RF Superstore into a world class RF and
microwave
component supplier. RF coaxial connectors & adapters, coaxial cable &
cable assemblies, surge protectors, attenuators. Items added daily. Free shipping
on orders over $25. We're leading the way again!
These archive pages are provided in order to make it easier for you to find items
that you remember seeing on the RF Cafe homepage. Of course probably the easiest
way to find anything on the website is to use the "Search
RF Cafe" box at the top of every page.
About RF Cafe.
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