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Friday the 13th
 When in junior high, I never cared much
for math, other than being able to do just enough to get by. In fact, I think I
got a "D" in ninth grade algebra. My interest in all things mechanical and electrical
for some reason never engendered an attraction to anything other than the simplest
addition, subtraction, multiplication, and division. There were no electronic pocket
calculators in the day, and I had never heard of a slide rule. Three years of an
electrical vocational program in high school forced me to comprehend and use a bit
more math for Ohm's law, Kirchhoff's law, some equations for magnetic induction,
and a little graphing of data points (not equations, though). Sometime while in
the USAF working as an air traffic control radar technician, I realized that in
order to pursue an engineering degree,
being good at mathematics would be a requirement. Beginning with a pre-algebra
course in a community college, I worked my way through algebra, calculus, differential
equations, linear algebra, and geometry courses...
 This is interesting because the Earth's
magnetic field is constantly changing, and might be on the verge of a pole reversal.
"The World Magnetic Model
is essential for navigation. The model, which compiles precise measurements of Earth's
magnetic field at points across the globe into one map, provides data on the constantly
shifting magnetic field. But the current system for collecting that vital data is
getting old. Now, a U.S. intelligence agency is in the final stages of a competition
to develop new technology to replace that aging system. The hope is to one day produce
an even more accurate World Magnetic Model, which is critical given its use in cellphones,
aircraft, and military applications. 'We're using this every day to figure out if
we're going left or right,' says David Roy-Guay, CEO of SBQuantum, one company participating
in the competition. 'The World Magnetic Model is the magnetic model used in any
and all navigation systems,' says Mike Paniccia, the program manager for the model.
The map is maintained by the National Geospatial-Intelligence Agency (NGA)..."
 Once again I have given selflessly and freely
of my time and talent to make available resources to those seeking certain knowledge
regarding vintage radio circuits ;-) This time it is the Radio Service Data Sheet
for the
Majestic Model 25, 9-Tube Twin-Detector. The info was published in a 1932 edition
of Radio-Craft magazine, one of Hugo Gernsback's many endeavors. Also on
the page is a complete list of all such schematics and tuning and repair data posted
thus far. At the left is a very nice example of a Majestic Model 25 console radio,
on the ebth.com auction website. Lots of great photos are posted with close-ups
of the tuning dial and the electronics chassis. Since this will eventually disappear,
I had Archive.org save a copy of the page.
/2023/X-Microwave-Sr-RF-Principal-Engineer-Manager-10-13-2023.htm">
 X-Microwave, a Quantic company, provides
modular RF and microwave building blocks that allow designers to seamlessly design,
evaluate, prototype, and produce high performance RF and microwave systems faster,
easier, and at lower cost. Quantic X-Microwave is seeking an experienced and motivated
/2023/X-Microwave-Sr-RF-Principal-Engineer-Manager-10-13-2023.htm">
Sr. RF Principal Engineer at X-Microwave to join our team to support design
and development of complex radar, electronic warfare (EW) and airborne RF microwave
assemblies and subsystems. Quantic X-Microwave is experiencing substantial growth
at our facility in Austin, Texas and we are seeking skilled talent to join our Engineering
and Manufacturing team. In this position you will design, develop, assemble, integrate,
and test complex RF assemblies and subsystems. Perform component analysis, trade
studies, simulations, modeling, to ensure compliance with our customers product
specifications...
 Use of a load line chart is a fast way of
selecting the bias (operating) point and the most linear operational range for nonlinear
devices. Notice that I didn't specifically say for transistors because this particular
article deals with load lines for vacuum tubes. Almost nobody has any need for tube
load line charts anymore, but the skill needed to interpret load lines for transistors
is fundamentally the same as for tubes. Substitute Vce (collector-to-emitter voltage)
for Plate Volts and Ic (collector current) for Plate Milliamperes and you have equivalence.
Popular Electronics magazine ran this "After Class" tutorial series covering
a broad variety of topics for many years. There is a short
Load Line Quiz at the end to measure how well you understand the lesson.
 With more than 1000
custom-built symbols, this has got to be the most comprehensive set of
Visio Symbols available for RF, analog, and digital system and schematic
drawings! Every object has been built to fit proportionally on the provided
A-, B- and C-size drawing page templates (or can use your own). Symbols are provided
for equipment racks and test equipment, system block diagrams, conceptual drawings,
and schematics. Unlike previous versions, these are NOT Stencils, but instead are
all contained on tabbed pages within a single Visio document. That puts everything
in front of you in its full glory. Just copy and paste what you need on your drawing.
The file format is XML so everything plays nicely with Visio 2013 and later...
 LadyBug Technologies was founded in 2004
by two microwave engineers with a passion for quality microwave test instrumentation.
Our employees offer many years experience in the design and manufacture of the worlds
best vector network analyzers, spectrum analyzers, power meters and associated components.
The management team has additional experience in optical power testing, military
radar and a variety of programming environments including LabVIEW, VEE and other
languages often used in programmatic systems. Extensive experience in a broad spectrum
of demanding measurement applications. You can be assured that our Power Sensors
are designed, built, tested and calibrated without compromise.
Thursday the 12th
 Hobnobbing with Harbaugh was a fairly regular
feature in Popular Electronics magazine in the 1950 and 1960s, compliments of Dave
Harbaugh. His cartoon themes touched on issues and situations of the day, mostly
dealing with, as you might expect, electronics. Many of them take place in an electronics
service shop or a sales floor. Harbaugh was an equal opportunity exploiter of dumb
acts by both workers and customers. My favorite of these four from the August 1961
issue is the guy servicing the Japanese chassis. A close second is the portable
TV gag; it took a moment to realize what is going on in the comic. The short-order
repair service is pretty clever as well. The forth comic is a little too inane to
even be funny, but that's just me. I took the liberty of colorizing these comics,
as I have been doing with many of them. Color in magazines was a rare commodity
even in 1961.
 "Semiconductors are the heart of almost
every electronic device. Without semiconductors, our computers would not be able
to process and retain data; and LED (light-emitting diode) light bulbs would lose
their ability to shine. But semiconductor manufacturing requires a lot of energy.
Forming semiconductor materials from sand (silicon oxide) consumes a significant
amount of heat-intensive energy, at scorching temperatures of around 2,700 degrees
Fahrenheit. And the process of purifying and assembling all the raw materials that
go into making a semiconductor can take weeks if not months. A new semiconducting
material called "multielement
ink" could make that process significantly less heat-intensive and more sustainable.
Developed by researchers from Lawrence Berkeley National Laboratory (Berkeley Lab)
and UC Berkeley, "multielement ink" is the first high-entropy..."
 Black Friday is known to most modern-day
people as the frenzied first day of Christmas shopping season on the day after Thanksgiving
(the 3rd Thursday of November). It is named so because supposedly on that day many
retailers finally turn the ink in their accounting books from red to black (net
loss to net profit, respectably). However, there was an infamous Black Friday that
occurred in the Fall of 1869, when the U.S. stock market experienced a severe crash.
Many know of the 1929 crash that precipitated The Great Depression, but the other
Black Friday, per this historical article from a 1948 edition of QST magazine,
caused its own "great depression" in wireless communications pioneer
Dr. Mahlon
Loomis. His reaction is understandable after reading this piece - which I highly
recommend to you. Dr. Loomis was a dentist whose side profession was being
an electrical experimenter. Decades prior to Guglielmo Marconi's world-changing
wireless message between St John's, Newfoundland, and Poldhu, Cornwall, in 1901,
Loomis publically demonstrated wireless communications between kite-borne antennas
(metal wire between the kite and the ground, a la Benjamin Franklin). It occurred
between two mountaintops separated by 18 miles. The high drama that occurred thence
while attempting to secure sponsorship funding for further experimentation is utterly
amazing...
 Axiom Test Equipment, an electronic test
equipment rental and sales company has published a new blog post that covers how
important
DC power supplies and loads are to control energy on the workbench and often
serve as starting points for new product development. DC loads and power supplies
work together to define the behavior of a device under test (DUT) in response to
applied energy, not just in performance but in reliability and compatibility with
other electronic devices. Power supplies are haunted (get
it - Halloween coming?) by two forms of noise: normal-mode output noise and
common-mode output noise. Normal-mode noise is generated by a power supply's internal
circuitry while common-mode noise is earth-referenced noise originating from the
power line or source. On the other hand, DC loads help evaluate power conversion
devices and systems, including power supplies and rechargeable batteries for electric
vehicles (EVs). The simplest starting point when searching for a DC power supply
is the amount of energy it supplies...
 Audio noises have been well tabulated in
the past but how does one set a tolerable
limit for radio-frequency noise? A recent Canadian Department of Transport regulation
(known officially as SOR 59-116 by the Queen's Printer, Ottawa, Canada) has defined
radio-frequency noise as any electrical disturbance "produced by any mechanical,
electrical, or other device" and capable of being received on a radio receiver.
The regulation refers specifically to r.f. generators in the ISM industrial bands,
in which the amount of r.f. energy produced is without limitation. However, any
r.f. generator in those bands must not have any emission outside of the band in
excess of 25 microvolts-per-meter at a distance greater than one-thousand feet from
the r.f. generator. A provision is also made that if r.f. generators are operated
on any frequency outside the ISM bands the limit shall be 15 microvolts-per-meter
at 1000 feet. Allowance is also made for higher power industrial equipment...
 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...
 Providing full solution service is our motto,
not just selling goods. RF & Connector Technology has persistently pursued a management
policy stressing quality assurance system and technological advancement. From your
very first contact, you will be supported by competent RF specialists; all of them
have several years of field experience in this industry allowing them to suggest
a fundamental solution and troubleshooting approach. Coaxial RF connectors, cable
assemblies, antennas, terminations, attenuators, couplers, dividers, and more. Practically,
we put priority on process inspection at each step of workflow as well as during
final inspection in order to actualize "Zero Defects."
Wednesday the 11th
 June of 1941, when this "America
Listens In" article appeared in Popular Science magazine, was half
a year before the Japanese Imperial Navy launched its surprise attack on the U.S.
Navy at Pearl Harbor. We had been unofficially providing England, France, and a
handful of other western European countries with intelligence data and even some
military hardware and troop training, but had no Congressionally declared entrance
into what would become World War II. Described here are methods and equipment
used to listen in on, translate, and study foreign broadcasts, mostly from Germany.
Use of wax cylinders for recording voice broadcasts was state of the art at the
time, since magnetic tape technology was still in its infancy. Maybe we should have
been putting as much effort into monitoring Japanese broadcasts; we might have averted
the attack. BTW, if you think the current state of affairs regarding strife engendered
between people groups being the work of media, dig this from the article: "Ill feeling
of another kind is the aim of the propaganda of dissension. By recalling dissatisfactions...
 Earth-based astronomy continue on a path
of doom. "China is pushing ahead with the construction of a second satellite megaconstellation
to provide broadband internet services and compete with SpaceX's Starlink. G60 Starlink,
which is backed by the Shanghai municipal government, will eventually comprise
more than 12,000 satellites in low earth orbit. Its potential size is similar
to Guo Wang, or National Network, a separate constellation consisting of some 13,000
satellites and commonly known as China's answer to Starlink. It is now under construction
by the state-owned Guo Wang company. Last month, a delegation led by Cheng Xiangmin,
party secretary of Shanghai's Songjiang district, inspected a new centre in western
Shanghai that was dedicated to the massive production of G60 satellites, according
to the district's official website. They also met representatives of the project's
industrial partners, including Shanghai Alliance Investment and Shanghai Spacecom
Satellite Technology..."
 Magnetic ceramics have been with us for
a long time - probably forever as far as most people that use them these days are
concerned. When this article was published in a 1953 issue of QST magazine, ferrites
for use at RF frequencies were a new, breakthrough phenomenon. Take a look at inductors
used in vintage radio equipment and you will find either air or solid iron as the
permeable filler elements in most instances. Whereas iron might have a permeability
of 100-150, the new magnetic ceramics exhibited permeabilities up to 4,000 at 1 MHz,
and even higher for lower frequencies. Modern alloys and compounds provide permeabilities
of more than 50,000 for special applications. Such high values allow physical size
and weight of inductors and transformers to be greatly reduced. Also, since high
permeability does a better job of constraining magnetic fields within their geometries,
less shielding is required to prevent crosstalk. A plethora of resources are available
on the Internet for design guidelines.
/2023/X-Microwave-Radio-Frequency-Technician-10-10-2023.htm">
X-Microwave, a Quantic company, provides
modular RF and microwave building blocks that allow designers to seamlessly design,
evaluate, prototype, and produce high performance RF and microwave systems faster,
easier, and at lower cost. Our Culture Dream Big. Have Fun. Get Stuff Done. As a
/2023/X-Microwave-Radio-Frequency-Technician-10-10-2023.htm">
RF Technician at X-Microwave, you will work with innovative team to support
product development and manufacturing for a wide range of customer applications.
You will be a key team member in the delivery of our modular design platform that
streamlines the design, prototyping, and production process of RF and Microwave
systems. You must be responsive, flexible, and able to succeed within a fast-paced
environment. In this role you will build test benches from DC to 110 GHz, interpret
component datasheets and read schematics, and utilize level 3 soldering and rework
skills. Electronics, RF hardware, or related discipline, or 5+ years of equivalent
experience is required. Contact us today if you are interested...
 This
Electronic Crosswords puzzle appeared in the May 1967 edition of Electronics
World magazine. Most of the words are related to electronics and science (unlike
my RF Cafe crossword puzzles, in which ALL words are pertinent. I will admit though,
that I use software to help fill in the matrix (using a database of thousands of
hand-entered words and definitions), whereas Mr. Kimsey had to do this one
all by himself. If you happen to be an avid cruciverbalist, then you might want
to try a few of the RF and microwave engineering themed crosswords that I have been
publishing weekly for two decades...
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...
 The
Wireless Telecom Group,
comprised of Boonton, Holzworth, and Noisecom, is a global designer and manufacturer
of advanced RF and microwave components, modules, systems, and instruments. Serving
the wireless, telecommunication, satellite, military, aerospace, semiconductor and
medical industries, Wireless Telecom Group products enable innovation across a wide
range of traditional and emerging wireless technologies. A unique set of high-performance
products including peak power meters, signal generators, phase noise analyzers,
signal processing modules, 5G and LTE PHY/stack software, noise sources, and programmable
noise generators.
Tuesday the 10th
 Three new circuits challenges await you
from this "What's
Your EQ?" feature in the September 1963 issue of Radio−Electronics
magazine. "EQ," by the way, stands for Electronics Quotient (a la "IQ"). The first
one is a relatively simple solving of two equations in two unknowns. Yes, I worked
it out; in fact, my solution is via the "complete the square" method, whereas the
author's solution plugs the coefficients in the quadratic equation. "Why No Voltage"
is not too hard, and is easily understood based on the author's explanation. "Where's
the TVI?" is more of a case study of an actual experience in locating the source
of television interference. The culprit ends up being similar to the source of AM
radio interference I got on my car radio in a certain area on my drive to work.
It was worst on high humidity mornings. Turns out the problem was that same as the
author's situation, only the damaged component in my case was a result of wear and
tear - not sabotage.
 The
American Radio Relay League (ARRL) is holding its
ARRL 2023 Online Auction from October
13th through 19th. A preview of auction items begins on October 10th. "Proceeds
from our yearly Online Auction go directly to ARRL's education programs, including
promoting activities to license new hams, strengthening Amateur Radio's emergency
service training, offering continuing technical and operating education, and creating
instructional materials. We would like to express our sincere appreciation to our
corporate partners and members for your generous donations." There are currently
74 items available, including radios, antennas, power supplies, tuners, noise cancellers,
test equipment, cable, books, microphones, and even "Mystery Boxes." If you have
something for the auction, now is the time to get it listed.
 If you have been searching for a do-it-yourself
VLF loop antenna that can be resonated from approximately 14 to 25 kHz,
then look no more. This article from a 1963 edition of Electronics World magazine
presents a relatively simple to build job that reportedly provides excellent reception.
At these frequencies a wavelength is measured in miles, which makes even a simple
dipole antenna impractical, so the multi-turn loop is the only reasonable alternative
for most people. It is the same principle that allows the little ferrite-core antenna
inside your AM radio to work so well when the shortest wavelength in the commercial
AM broadcast band (535 - 1700 kHz in the U.S.) is nearly 600 feet.
 RIGOL Technologies has added to its line−up
of
high resolution oscilloscopes with the introduction of the DHO800/DHO900 series.
These new oscilloscopes have a compact, portable design which is flexible to use
for both on-site and desktop testing. DHO800/900 oscilloscopes feature true 12−bit
resolution with low noise for excellent signal fidelity and analysis. DHO900 oscilloscopes
are available in 125−250 MHz bandwidths, 4 channels, 1.25 GSa/sec sampling,
1,000,000 wfms/s waveform capture rate, and 50 MPts of memory standard. DHO800 scopes
offer 70-100 MHz bandwidths, 4 channels, 1.25 GSa/sec sampling, 1,000,000 wfms/s
waveform capture rate, and 25 MPts of memory standard. Both series feature
12 bit resolution, a 7" intuitive touch screen display and support type−C power.
They are powered by the new UltraVision III platform featuring a custom ASIC chipset,
which also provides for dramatically lower front-end noise. The higher resolution
and lower noise enable users to analyze much smaller signal artifacts with greater
speed and accuracy. "The new DHO800 and 900 series scopes are an excellent extension...
 Receiving information wirelessly or even
over a wire is taken for granted today, but 80 years ago it was considered a "miracle
of God" - that's what Alexander Graham Bell called it. Some regarded radio as being
of the devil. The same is true of today's omnipresent communications - some consider
it a blessing while others call it a curse. I'm somewhere in the middle. In 1934
when this Radio News & Shortwave magazine was published, the telecommunications
world was in its heyday of growth with a reported 17 million listeners of AM radio
(no FM yet). Radio dealers and servicemen were gearing up for customers with unbridled
enthusiasm for the fledgling commercial broadcast industry's offerings. Even in
the midst of the
Great
Depression, people were joining in on the wireless craze in large numbers, and
amateur radio operators were almost feared for their awesome ability to comprehend
and practice the black art of antennas and radio receivers...
 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 220,000
per year (in six locations on each page, with >17,000 pages). That's pretty good
exposure for $300 per month. Some companies have expressed an interest in being
able to manage their advertising accounts themselves a la the Google AdSense program...
 KR Electronics has been designing and manufacturing
custom filters for military and commercial radio, radar, medical, and communications
since 1973. KR Electronics' line of filters includes lowpass, highpass, bandpass,
bandstop, equalizer, duplexer, diplexer, 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.
Monday the 9th
 This
International Correspondence Schools ad in a 1937 issue of Popular Mechanics
magazine made me laugh when I saw it, so I figured it was worth posting to see how
you react to it. As a lifelong consumer of technical and do-it-yourself type magazines,
I remember always seeing advertisements for at−home learning courses, as well as
many campus-based training for fields that require hands−on work with engines, machinery,
boats, trains, airplanes, etc. Local, state, and federal code books were not bursting
at their bindings with rules and regulations on every aspect of business from initial
registration to specific kinds of goods and services you were permitted to ply your
trade toward, and for whom you might be willing to work. A man could fairly easily
gain enough knowledge through self-study to start his own business and/or qualify
for an apprenticeship with experienced operators - often without a large investment
in equipment. Interestingly, there do not seem to be any courses offered in areas
like...
  The newest release of RF Cafe's spreadsheet
(Excel) based engineering and science calculator is now available -
Espresso Engineering Workbook™. Among other additions, it now has a
Spurious Product Calculator with a graphical display. Since 2002, the original
Calculator Workbook has been available as a free download. Continuing the
tradition, RF Cafe Espresso Engineering Workbook™ is also
provided at no cost,
compliments of my generous sponsors. The original calculators are included, but
with a vastly expanded and improved user interface. Error-trapped user input cells
help prevent entry of invalid values. An extensive use of Visual Basic for Applications
(VBA) functions now do most of the heavy lifting with calculations, and facilitates
a wide user-selectable choice of units for voltage, frequency, speed, temperature,
power, wavelength, weight, etc. In fact, a full page of units conversion calculators
is included. A particularly handy feature is the ability to specify the the number
of significant digits to display. Drop-down menus are provided for convenience.
Now that a more expandable basis has been created, I plan to add new calculators
on a regular basis...
 Metal oxide resistors have been around since
the early 1960s. We take them for granted now, but prior to their appearance on
the market the mainstays of electronics resistance elements were carbon composition
and wirewound resistors. Carbon compound types are very inexpensive and are acceptable
for a wide range of applications, but they have a bad habit of shifting value over
time, particularly when subject to repeated heating and cooling cycles. Wirewounds
(WW) are a good alternative when cost and physical space are not issues, but WW's
can be tricky or even impossible to use when frequencies get above a few tens of
megahertz because of inductance limitations. Metal film resistors exhibit much better
long term stability than carbon composition types, and can operate well at frequencies
in the hundreds of megahertz while dissipating a few watts of power. The television
industry benefitted greatly...
 "Researchers based in Sweden report low
ohmic contact resistance (Rc) for
recessed titanium/aluminum (Ti/Al) metal electrodes with a view to deployment
in gallium nitride (GaN) high-electron-mobility transistors (HEMTs) and other transistors.
Rc values as low as 0.14Ω-mm were achieved with a low annealing temperature of 550°C.
The team from SweGaN AB, Chalmers University of Technology, Linköping University,
Terahertz Materials Analysis Center, and Lund University, comment that their approach
'provides a large process window without the requirement of precise control of the
recessed etching depth.' Lowering Rc for HEMTs should reduce power losses, making
for less heat and noise generation, while increasing power output and efficiency.
The team sees their electron-beam evaporation process as being less complex than
other recessed contact structures that regrow doped III–nitride material in metal-organic
chemical vapor deposition (MOCVD) in the recess. Electron-beam evaporation is more
favored in industrial production..."
 The
RCA Victor Portable Table Electrola Model R-95 is a record player / turntable
/ phonograph (choose your terminology) with a built-in audio amplifier and voice
coil speakers speakers. Many portables of the day were all mechanical with hand
cranks for power and one of the big horn sound amplifiers like on the Victrolas
(note the R-95 is called an "Electrola"). Little information is available for it
on the Web, and I could not find any photos. "Portable" back in 1936, when this
schematic and datasheet appeared in Radio-Craft magazine, meant it might be possible
for a person of moderate strength to lug it around and set it up on a table. An
accompanying hernia was often involved. There are still many people who restore
and service vintage radios and phonographs, so I post these when run across. A growing
list of all data sheets can be found at the bottom of the page...
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...
LadyBug Technologies was founded in 2004
by two microwave engineers with a passion for quality microwave test instrumentation.
Our employees offer many years experience in the design and manufacture of the worlds
best vector network analyzers, spectrum analyzers, power meters and associated components.
The management team has additional experience in optical power testing, military
radar and a variety of programming environments including LabVIEW, VEE and other
languages often used in programmatic systems. Extensive experience in a broad spectrum
of demanding measurement applications. You can be assured that our Power Sensors
are designed, built, tested and calibrated without compromise.
Sunday the 8th
 This custom RF Cafe
engineering-themed crossword puzzle for October 8th contains words and clues
which pertain exclusively to the subjects of electronics, science, physics, mechanics,
engineering, power distribution, astronomy, chemistry, etc. If you do see names
of people or places, they are intimately related to the aforementioned areas of
study. Being that "H" is the 8th letter of the alphabet, it is used as the first
and/or last letter of many words in today's crossword puzzle - as well as in-between.
Those clues are marked with an asterisk (*, or **, depending on the number of them
in the word). As always, you will find no references to numbnut movie stars or fashion
designers. Need more crossword RF Cafe puzzles? A list at the bottom of the page
links to hundreds of them dating back to the year 2000. Enjoy...
 This assortment of custom-designed themes
by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins,
Purses, Sweatshirts, Baseball Caps, and more, all sporting my amazingly clever "RF Engineers - We
Are the World's Matchmakers" Smith chart design. These would make excellent
gifts for husbands, wives, kids, significant others, and for handing out at company
events or as rewards for excellent service. My graphic has been ripped off by other
people and used on their products, so please be sure to purchase only official RF
Cafe gear. I only make a couple bucks on each sale - the rest goes to Cafe Press.
It's a great way to help support RF Cafe. Thanks...
 Since 1996, ISOTEC has designed, developed
and manufactured an extensive line of RF/microwave connectors, between-series adapters, RF components
and filters for wireless service providers including non-magnetic connectors for
quantum computing and MRI equipments etc. ISOTEC's product line includes low-PIM
RF connectors components such as power dividers and directional couplers. Off-the-shelf
and customized products up to 40 GHz and our low-PIM products can meet -160 dBc
with 2 tones and 20 W test. Quick prototyping, advanced in-house testing and
high-performance. Designs that are cost effective practical and repeatable.
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