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5 of the January 2023 homepage archives. Friday the 20th
 Most people involved in electronics who
are over 40 years old are familiar with Heathkit. The company ran advertisements
in many types of hobby and home improvement magazines and sold a very large line
of built-it-yourself kits until the early 1990's. Heathkit was in its heyday in
1960 when they dominated advertising (8 pages) in the January 1960 issue of
Radio-Electronics magazine (it would have arrived in the mail before Christmas).
Lesser known was
knight-kits, offered by Allied Electronics. Tandy Corporation, parent company
of Radio Shack, bought Allied Electronics in 1970. Their ad spread in the same issue
was half that of competitor Heathkit. I never had a knight-kit, but did have a few
Heathkits. A search on knight-kits turned up knightkit.com, which does not appear
to be formally affiliated with the company. It celebrates the "knight-kit Wireless
Broadcaster and Amplifier," which is not included in this ad. This nostalgickitscentral.com
website has an extensive listing of knight-kits. As you might expect, there is a
plethora of vintage knight-kit items available on eBay...
 "Hydrogels
are three-dimensional (3D) polymer networks that do not dissolve in water but retain
large amounts of liquids. Due to this advantageous property, hydrogels are particularly
promising material platforms for both biomedical and environmental applications,
as they can survive in bodily fluids or in wet natural environments without dissipating.
Over the past decade, engineers and materials scientists have been developing numerous
electronic devices based on soft hydrogels, including environmental and biomedical
sensors, drug delivery devices, and artificial tissue. Despite the huge potential
of these hydrogel-based devices, their widespread implementation has so far been
hindered by their high production costs. A research team led by Dr. Nanjia Zhou
at Westlake University and Westlake Institute of Advanced Studies in China have
recently introduced a new strategy to enable the 3D printing of soft hydrogel electronics.
Their approach, introduced in a paper published in Nature Electronics, could help
to lower the production costs of num
 These interactive maps were created by the
FCC to illustrate the Commission's broadband and cellular deployment results. The
original was found in the Eighth
Broadband
Progress Report which uses data underlying the National Broadband Map, as of
June 30, 2011. It shows census block areas of the United States with and without
access to fixed broadband of 3 Mbps download and 768 kbps upload. The
FCC is now up to the Fourteenth Broadband Progress Report, published for the second
half of 2020, where it states, "As of the end of 2019, the vast majority of Americans,
94% had access to both 25/3 Mbps fixed broadband service and mobile broadband service
with a median speed of 10/3 Mbps. Also as of the end of 2019, mobile providers now
provide access to 5G capability to approximately 60% of Americans..."
 One of the disadvantages of living more
than six decades is learning of the passing of people you have regarded highly for
many years. Even without knowing them personally, the deaths of guys like
Bob Pease
and Robert Lucky, whose
magazine columns I read eagerly each month, always come as a shock and are met with
sadness. Yesterday, news came out of
Lou Frenzel, Jr., having departed from amongst us. Many links to Lou's clever
and knowledge-filled articles have appeared over the years here on the RF Cafe
homepage. He often incorporated his amateur radio (W5LEF) hobby into articles. Writes
William Wong at Electronic Design, "I'm sad to say that my friend and colleague,
Lou Frenzel, Jr., has passed away. Lou was a long-time contributor and editor at
Electronic Design and Microwaves & RF. You can still read
his Communiqué blog entries on Electronic Design that covered a range of
topics from software-defined radio (SDR) to his time with Heathkit, as well as his
blogs and assorted articles on Microwaves & RF. Lou is one of the few
editors that had both the technical background and the chops to write well..."
 For a long time I have been scanning and
posting schematics & parts lists like this one featuring the
International Kadette Model 400 4-tube battery-pperated superheterodyne radio
in graphical format. As with all the other vintage articles posted, it requires
running OCR on them to separate the textual content from the graphics. This particular
Radio Service Data Sheet came from the July 1936 issue of Radio-Craft magazine.
There are still many people who restore and service these vintage radios, and often
it can be difficult or impossible to find schematics and/or tuning information.
A fine example of a restored International Kadette Model 400 tabletop radio can
be seen on the RadioMuseum.org website...
/jobs.htm">![Engineering Job Board - RF Cafe]() 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 /jobs.htm">job openings. HR department employees and/or managers of hiring
companies are welcome to submit opportunities for posting at no charge. 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...
 Amplifier Solutions Corporation (ASC) is
a manufacturer of amplifiers for commercial & military markets. ASC designs
and manufactures hybrid, surface mount flange, open carrier and connectorized amplifiers
for low, medium and high power applications using Gallium Nitride (GaN), Gallium
Arsenide (GaAs) and Silicon (Si) transistor technologies. ASC's thick film designs
operate in the frequency range of 300 kHz to 6 GHz. ASC offers thin film
designs that operate up to 20 GHz. ASC is located in an 8,000 sq.ft. facility
in the town of Telford, PA. We offer excellent customer support and take pride in
the ability to quickly react to evolving system design requirements.
Thursday the 19th
 These Mac's Service Shop techno-stories
tutorially mix real-world entities with tips on troubleshooting, repair, alignment,
customer service, industry news, and other relevant topics. Although not directly
related to this "Oscillating
Canine" episode in a 1960 issue of Electronics World magazine, mention is made
of the Bon Ton Department Store. It could possibly be a reference to the modern-day
The Bon-Ton store since according to Wikipedia the company was founded in 1898 (renamed
Bon-Ton Millinery in 1902). The reference is actually to the store owner, who engaged
Mac to convert a radio receiver to pick up weather station broadcasts from his airplane.
The story's title has to do with another subject - a hard-to-get-rid-of oscillation
in a transistorized radio. It is one of the first instances of solid state components
and the printed circuit boards to which they are attached. Barney laments the difficulty
of troubleshooting the configuration as opposed to the good 'ole vacuum tube circuits...
 "Here's how some of the nation's universities
and research groups are working to drive counterfeits out of the manufacturing supply
chain.
Counterfeit parts pose a serious risk to the electronics supply chain, where
products that don't meet electrical safety standards and/or minimal specifications
can degrade system performance, cause equipment to malfunction and create myriad
other hazards. Even the U.S. Department of Defense (DoD) supply chain is vulnerable
to the risk of counterfeit parts and estimates that as much as 15% of all spare
and replacement parts for military electronics may be counterfeit. It seems that
the bad actors behind these counterfeit parts are getting gutsier. In July, for
example, a U.S. court charged one enterprise for selling counterfeit Cisco networking
devices through 19 companies and multiple different online storefronts, Mirror Now
reports. The operation was importing tens of thousands of fake Cisco devices from
China and Hong Kong. It then resold those fakes to customers in the U.S. and overseas
while falsely claiming..."
 October 29, 1929, aka "Black Tuesday," is
a date that will live in infamy. It was the beginning of the U.S. stock market crash
that resulted in The Great Depression. Since magazines, particularly in the pre-digital
era, went to press a month or two prior to hitting the postal system and store racks,
almost nobody had any idea that by the time this issue of QST magazine
was being read, investors would be hurling themselves out of high rise building
windows and off tall bridges. As the country was coming to grips with what would
ultimately be a nearly two decade long financial struggle, nonessential creature
comforts like concert quality recorded and broadcast music equipment like that facilitated
by
Sangamo Electric Company's fine condensers (capacitors) were taking a back seat
to worrying about keeping a job and buying food for your family. Sangamo Electric,
born in 1899 as an offshoot...
 Anatech Electronics offers the industry's
largest portfolio of high-performance standard and customized
RF and microwave filters and filter-related products for military, commercial,
aerospace and defense, and industrial applications up to 40 GHz. Three new
filter surface mount, low loss ceramic bandpass filter models have been introduced
- the AE1087CB1795 with a 1,087.5 MHz center frequency and a 255 MHz
bandwidth, the AE3125CB1802 with a 3,125 MHz center frequency and a 120 MHz
bandwidth, and the AM784B1271 with a 784 MHz center frequency and a 17 MHz
bandwidth. Custom RF power filter and directional couplers designs can be designed
and produced with required connector types when a standard cannot be found, or the
requirements are such that a custom approach is necessary...
 Here are a few more
tech-themed comics from vintage editions (1962 and 1970) of Popular Electronics
magazine. The first comic with the transistors and fuse is really clever, IMHO.
It was one of the "Parts Talk" series. The other two are directed toward amateur
radio operators, but you don't need to be one to appreciate the humor. There is
a hyperlinked list at the bottom of the page of most of the other comics I've posted
over the years. It's a shame that comics rarely appear in contemporary technical
magazines - probably too afraid of offending someone...
 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!
 Exodus Advanced Communications is a multinational
RF communication equipment and engineering service company serving both commercial
and government entities and their affiliates worldwide. Power amplifiers ranging
from 10 kHz to 51 GHz with various output power levels and noise figure
ranges, we fully support custom designs and manufacturing requirements for both
small and large volume levels. decades of combined experience in the RF field for
numerous applications including military jamming, communications, radar, EMI/EMC
and various commercial projects with all designing and manufacturing of our HPA,
MPA, and LNA products in-house.
Wednesday the 18th
 Imagine how amazed and pleased the electronics
pioneers would be to see how far the science has progressed since they last walked
the Earth. Hugo Gernsback, who had as the founder and editor of multiple electronics
magazines and books been writing about, designing, and building electronics devices
since the early days of the last century, is surely amongst them. In this "Automation
in Electronics" article in a 1960 issue of Radio-Electronics, Mr. Gernsback
alludes back to the year 1773 to declare John Joseph Merlin's Silver Swan automaton
as the world's first instance of automation. Electronics, in conjunction with equally
ingenuous mechanical contraptions, has continually provided the means of replacing
tedious, sometimes dangerous, repetitive tasks with automated processes. He cites
AT&T's electronics telephone circuit switching systems as an excellent example.
Distractors did then and still do today claim automation displaces human workers...
 RIGOL Technologies is transforming the Test
and Measurement Industry. Our premium line of products includes digital and mixed
signal oscilloscopes, spectrum analyzers, function / arbitrary waveform generators,
programmable power supplies and loads, digital multimeters, data acquisition systems,
and application software. Our test solutions combine uncompromised product performance,
quality, and advanced product features; all delivered at extremely attractive price
points. This combination provides our customers with unprecedented value for their
investment, reduces their overall cost of test, and helps speed time to completion
of their designs or projects.
 This is the first of a two-part article in
c1936 Radio-Craft magazine about the strengths and weaknesses, pros and
cons, vices and virtues of
vacuum tubes with and without grids. Author Henri Dalpayrat offers a list of
no fewer than 17 drawbacks and limitations of gridded tubes. While necessary to
fully control the flow of electrons from the cathode to the plate, their physical
presence causes issues with parasitic capacitance, thermal noise, electrical variability
due to physical differences, increased manufacturing cost, and lower reliability.
Eliminate the control grid(s) and most of those problems go with it. Part 2, extolling
the virtues of gridless, was printed in the January 1937 issue...
 "A laser-controlled
water-based switch that operates twice as fast as existing semiconductor switches
has been developed by a trio of physicists in Germany. Adrian Buchmann, Claudius
Hoberg, Fabio Novelli at Ruhr University Bochum used an ultrashort laser pulse to
create a temporary metal-like state in a jet of liquid water. This altered the transmission
of terahertz pulses over timescales of just tens of femtoseconds. With the latest
semiconductor-based switches approaching fundamental upper limits on how fast they
can operate, researchers are on the hunt for faster ways of switching signals. One
unexpected place to look for inspiration is the curious behaviour of water under
extreme conditions – like those deep within ice-giant planets or created by powerful
lasers. Molecular dynamics simulations suggest water enters a metallic state at
pressures of 300 GPa and temperatures of 7000 K. While such conditions do not occur
on Earth, it is possible that this state contributes to the magnetic fields of Uranus
and Neptune..."
 If you have never written an article for
publication, or written a
technical manual for a piece of equipment, or maybe created a test procedure
document for an assembly line, then it is hard to appreciate the skill needed to
assimilate information into a concise, easy-to-follow missive that an audience of
a targeted skill level will find useful. Deciding what information is needed and
what will cause confusion due to redundancy or misinterpretation, including not
just written content but illustrations and/or photographs, can cause much consternation
during the creative process. Of course as we all know from having had to deal with
poorly written documents, some authors either do not care or do not know how to
write effectively. Competent technical writers have always been needed, and even
with modern day computerization providing spelling and grammar checkers, there still
is no substitute for a quality human writer. Having written hundreds of technical
articles, manuals and test procedures myself, I still suffer from indecision on
content and experience the foibles of relying too heavily on word processor error
checking. This 1956 article from Popular Electronics magazine says a top
technical writer can expect to earn $4.50 per hour ($9,360/yr.)...
 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...
 Withwave manufactures an extensive line
of metrology quality coaxial test cable assemblies, connectors (wave-, end-, vertical-launch,
board edge, panel mount), calibration kits (SOLT), a
fully automated
4-port vector network analyzer (VNA) calibrator, between- and in-series connector
adaptors, attenuators, terminations, DC blocks, torque wrenches, test probes &
probe positioner. Special test fixtures for calibration and multicoax cable assemblies.
Frequency ranges from DC through 110 GHz. Please contact Withwave today to
see how they can help your project succeed.
Tuesday the 17th
 The
VOR (VHF omnidirectional range) electronic aircraft navigation concept is one
of the most ingenious, elegant system solutions ever designed. Using what is essentially
a very simple phase comparison method, a navigation signal is generated that is
precise and reliable enough to be trusted for instrument flight rules (IFR) by military,
commercial, and private aviation. A physically rotating antenna in the ground station
was originally used, but eventually an electronically swept method replaced it so
there are no moving parts. I was trained on VOR navigation during private pilot
flight training in the early 1980's, before there was a GPS. GPS has largely replaced
VOR (and VORTAC) as a primary navigation tool, but a lot of airplanes still carry
VOR equipment either as a backup or simply because the pilot prefers that method.
IFR can be flown without VOR/VORTAC or GPS under certain conditions, but no sane
pilot would try it without at least one of the two...
 Sound effects in television and movies are
in the modern era generated electronically at the push of a button or the clicking
of a mouse. Thousands of sound effects are available for download to enhance amateur
videos. Whether you need the clopping of horse hooves, birds chirping, a street
racer squealing his wheels coming off the starting line, or a baby crying in the
background, it's all at your disposal - and usually at no cost. Prior to around
1960, with the exception of the incredibly phony sounding "canned" laugh tracks
and audience clapping used on "live" situational comedies and variety shows, all
those aforementioned sound effects had to be created real-time in the recording
studio. Even if you are too old to have actually listened to old time radio shows
like The Lone Ranger and The Shadow, surely you have watched an old movie where
a gun shot was heard or footsteps on a wooden floor. Almost certainly those sounds
were made by somebody using one of the methods shown...
 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."
 "Over the past few decades, the performance
of machine learning models on various real-world tasks has improved significantly.
Training and implementing most of these models, however, still requires vast amounts
of energy and computational power. Engineers worldwide have thus been trying to
develop alternative hardware solutions that can run artificial intelligence models
more efficiently, as this could promote their widespread use and increase their
sustainability. Some of these solutions are based on
memristors, memory devices that can store information without consuming energy.
Researchers at Université Paris-Saclay- CNRS, Université Grenoble-Alpes-CEA-LETI,
HawAI.tech, Sorbonne Université, and Aix-Marseille Université-CNRS have recently
created a so-called Bayesian machine (i.e., an AI approach that performs computations
based on Bayes' theorem), using memristors. Their proposed system, introduced in
a paper published in Nature Electronics, was found to be significantly more energy-efficient
than currently employed hardware solutions. "Artificial intelligence is making major
progress..."
 In the mid 1930s when this Radio-Craft
magazine was published, hand-assembled products like
metal vacuum tubes were by far the rule rather than the exception for most products
be they electronics, furniture, appliances, automobiles, or toys. Many people lament
- even curse - the advent of machine automation in production, but the fact is for
the vast majority of things the consistency and quality of the finished component
is typically much greater. Toiling at the same task, in the same location, day after
day, gets unbearable very quickly for someone like me who likes to accomplish a
particular job and then move on to something new - even if "new" is defined as the
same type of endeavor but with different materials. There are many people, thankfully,
who do not mind monotony and prefer its lack of constant challenge to employment
that requires constant new challenges...
/jobs.htm">![Engineering Job Board - RF Cafe]() 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 /jobs.htm">job openings. HR department employees and/or managers of hiring
companies are welcome to submit opportunities for posting at no charge. 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...
 The leading website for the PCB industry.
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.
Monday the 16th
 RF Cafe visitor and former article contributor
Brad Baker* sent a new paper he wrote entitled "High
Frequency Speech Processor." In it, he presents a method for clipping of audio
signals at the baseband stage of an RF transmitter in order to facilitate more efficient
broadcasting of a SSB signal. Mr. Baker's process applies a Hilbert transform
and uses the real part of the complex result to modulate the output. A significant
difference between this and previous schemes is that here a feed-forward circuit
is used rather than a closed-loop feedback circuit. Brad provided an MP3 audio file
which demonstrates various levels of clipping, beginning with a raw, unprocessed
sample. You might wonder why he chose the sentence, "It's easy to tell the depth
of a well," for use. While I cannot say why that particular one was used, a little
research showed that it is a sentence from a list called the Harvard Sentences,
From "IEEE Recommended Practice for Speech Quality Measurements." Revised List of
Phonetically Balanced Sentences. Specific phonemes are employed. I suppose you'd
have to be a voice processing guy to know about that. Now you know...
 Axiom Test Equipment allows you to
rent or
buy test equipment,
repair
test equipment, or sell or trade test equipment. They are committed to providing
superior customer service and high quality electronic test equipment. Axiom offers
customers several practical, efficient, and cost effective solutions for their projects'
TE needs and is committed to providing superior customer service and high quality
electronic test equipment. For anyone seeking a way to offload surplus or obsolete
equipment, they offer a trade-in program or they will buy the equipment from you.
Some vintage items are available fully calibrated. Please check out Axiom Test Equipment
today - and don't miss the blog articles!
 History keeps repeating itself. While reading
this c1966 "Radiomanship"
article by Mr. Paul Amis you might think it is a contemporary piece lamenting
the lack of technical understanding - or even interest in the technical aspects
- of amateur radio equipment. Just as with the perpetual frustration by seasoned
hobbyist veterans of all fields, concern for younger participants with their short
attention spans and busyness with many other forms of time-consuming distractions
causes the aforementioned old-timers to loose precious sleep. ...and yet our hobbies
live on, albeit maybe under different manifestations and rules. Interestingly, this
might be the first time I have read in one of these vintage QST magazines
about computers capable of talking - or about computers...
 A review of a new book entitled "Open Circuits: The Inner Beauty of
Electronic Components" is currently posted on the IEEE Spectrum website.
A few très cool photos from the book are included article. The publisher's name
is, get this, No Starch Press (is that great or what?) "Eric Schlaepfer was trying
to fix a broken piece of test equipment when he came across the cause of the problem
- a troubled tantalum capacitor. The component had somehow shorted out, and he wanted
to know why. So he polished it down for a look inside. He never found the source
of the short, but he and his collaborator, Windell Oskay, discovered something even
better: a breathtaking hidden world inside electronics. What followed were hours
and hours of polishing, cleaning, and photography that resulted in 'Open Circuits: The Inner Beauty of Electronic Components',
an excerpt of which follows. As the authors write, everything about these components
is deliberately designed to meet specific technical needs, but that design leads
to 'accidental beauty: the emergent aesthetics of things you were never expected
to see..."
 Radio Shack was opened in 1921 by brothers
Theodore and Milton Deutschmann, then was bought by Tandy Corporation in 1962, reportedly
for $300k. As well as being an outlet for hobbyists to buy common electronics parts,
Radio Shack sold its own line of electronics like radios, calculators, and stereo
systems under the brand name Realistic. A lot of people don't like Radio Shack the
same way many don't like Walmart - usually for no good reason. I first started shopping
at Radio Shack in the mid 1970s when I needed parts to build a homebrew stereo radio
receiver from an article in Popular Electronics magazine (if I remember
correctly). I still like going in the store and looking around, occasionally actually
buying something. Do you remember the Free Battery card they issued where you could
get one free battery per month? How about the vacuum tube testers that were in the
stores until the late 1970s? When our TV would crap out...
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...
 Empower RF Systems is the technological
leader in RF & microwave power amplifier solutions for EW, Radar, Satcom, Threat
Simulation, Communications, and Product Testing. Our air and liquid cooled amplifiers
incorporate the latest semiconductor and power combining technologies and with a
patented architecture we build the most sophisticated and flexible COTS system amplifiers
in the world. Solutions range from tens of watts to hundreds of kilowatts and includes
basic PA modules to scalable rack systems.
Sunday the 15th
 This custom made
Electronics theme crossword puzzle for January 15th is provided compliments
of RF Cafe. All RF Cafe crossword puzzles are custom made by me, Kirt
Blattenberger, and have only words and clues related to RF, microwave, and mm-wave
engineering, optics, mathematics, chemistry, physics, and other technical subjects.
As always, this crossword puzzle 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!
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...
 Anatech Electronics (AEI) manufactures and
supplies RF and microwave filters for military and commercial communication
systems, providing standard LP, HP, BP, BS, notch, diplexer, and custom RF filters,
and RF products. Standard RF filter and cable assembly products are published in
our website database for ease of procurement. Custom RF filters designs are used
when a standard cannot be found, or the requirements dictate a custom approach for
your military and commercial communications needs. Sam Benzacar's monthly newsletters
address contemporary wireless subjects. Please visit Anatech today to see how they
can help your project succeed.
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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