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Today in Science History -
 Development of the
cavity magnetron
during World War II helped change the destiny of Allied forces through
using high frequency
radar with enough power to detect distant targets while using frequencies which
were out of the normal detection
bands of Axis forces' receivers. Most equipment at the time could not operate
efficiently (or at all) above a few hundred MHz. It was considered a top-level secret
with great concern that the technology not fall into the hands of German and
Japanese scientists. According to this early post-war advertisement in a 1945
issue of Radio News, Bell Labs was totally consumed by the development of magnetrons, and
was relieved to finally be able to boast of its critical role now that the war
was over...
 RIGOL
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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.
 Times Microwave Systems, a pioneering brand
in innovative RF and microwave interconnect assemblies, cables and connector design,
announces the addition of a new
1/2" plenum RF cable to its product line. The LPA-500 LLPL air-dielectric corrugated
plenum cable is a low-loss, plenum listed (type CMP) coaxial cable. Available now,
its design offers excellent intermodulation performance, and can be used as feedlines
within buildings to support distributed antenna systems (DAS); public safety communications
systems; RF backbone interconnects within plenum airspaces; and additional applications.
The LPA-500 LLPL is an affordable option that provides the quality and performance
for which Times is universally recognized. The new 1/2" plenum RF cable...
 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
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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.
 Contrary to the scenario presented in this
light-hearted mockery of housewives attempting to assemble some electronics kits,
there were actually many women during the height of the radio and television age
who were quite adept at handling soldering irons and test equipment. In fact, the
case could be made that, given the 1947 appearance of this "Housewives
and Television" piece in Radio-Craft magazine, women of the post-wartime industrial
period were probably the most experienced and adept assemblers of electronics equipment.
After all, it was Rosie the Riveter who built airplanes, ships, and tanks while
Sally the Solderer built the bulk of the tens of thousands of radios, radars, sonars,
medical and test instruments, vacuum tubes, amplifiers, and other electronics while
the brothers...
Reactel has become one of the industry leaders in the design and manufacture
of RF and microwave filters,
diplexers, and sub-assemblies. They offer the generally known tubular, LC, cavity,
and waveguide designs, as well as state of the art high performance suspended substrate
models. Through a continuous process of research and development, they have established
a full line of filters of filters of all types - lowpass, highpass, bandpass, bandstop,
diplexer, and more. Established in 1979. Please contact Reactel today to see how
they might help your project.
 "In 1999, the Egyptian chemist Ahmed Zewail
received the Nobel Prize for measuring the speed at which molecules change their
shape. He founded femtochemistry using ultrashort laser flashes: the formation and
breakup of chemical bonds occurs in the realm of femtoseconds. Now, atomic physicists
at Goethe University in Professor Reinhard Dörner's team have for the first time
studied a process that is shorter than femtoseconds by magnitudes. They measured
how long it takes for a photon to cross a hydrogen molecule: about 247
zeptoseconds
for the average bond length of the molecule. This is the shortest timespan..."
 It seems most of the articles we see on the
subject of
attenuator pads are based on signal reduction in terms of decibels for units
of power. Although it is a simple matter to convert power decibels to voltage decibels,
it would be more convenient if you are working with voltage to have formulas and
tables of values based on voltage ratios. This article does just that. As a reminder,
the decibel representation of a ratio is always 10 * log10 (x). If
you have a voltage ratio of V1/V2 = 0.5, then 10 * log10 (0.5) = -3.01 dB.
If you have a power ratio of P1/P2 = 0.5, then 10 * log10 (0.5) = -3.01 dB.
Does that mean that -3.01 dB of voltage attenuation is the same as 3.01 dB
of power attenuation? Confusingly, no. Let's say for the sake of simplicity that
you have 1 V across a 1 Ω resistor...
 Nokomis Inc., is a high technology research
and development company located just south of Pittsburgh, PA. Nokomis does cutting-edge
technology work for the Department of Defense (DoD) and other Government Agencies.
We rank in the top 3 for entities under 300 employees in the state of Pennsylvania
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Engineer, capable of solving complex technical problems and providing innovative
solutions in the areas of Electrical Engineering and the part, board and system
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Candidates with specialized experience in digital design, analog design mixed signal
design or RF design will be considered as each of these disciplines is required.
The ideal candidate will have an understanding of and experience with digital, analog,
mixed signal and RF systems...
 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.
 It's about time for a little joviality so
here are the three
technology-themed comics which appeared in the November 1953 issue of Radio-Electronics
magazine. They cover a wide range of situations experienced by electronics types
back in the day, including the fickleness of customers, an exaggeration of an explorer's
unexpected discovery deep in a jungle, and the frustrated indignation of a parts
supplier by the selective memory of a serviceman in need of replacement components.
Enjoy!
 Withwave announces the introduction of
Vertical Launch Connectors which are specially designed for solderless vertical
PCB launch on test & measurement board. These connectors have excellent electrical
transition performance up to 26.5 GHz, 50 GHz, 67 GHz & 110 GHz
respectively as well as reduce installation time by eliminating soldering. Excellent
vertical transition (VSWR <1.3, 1.85 & 1.0 mm type: VSWR <1.6 ). ANSYS
HFSS models available (version 17.0 or newer) for 3D EM (electromagnetic) simulation...
 "An industry-leading military
radar receiver manufacturer needed to deliver radar receivers that met tough
new customer specifications. To ensure a quality product, the manufacturer reviewed
many aspects of its test strategy, focused on ensuring its radar receivers could
meet the new specifications. Radar receiver sensitivity is critical for electronic
warfare (EW) applications. A radar receiver that is outside specifications will
fail to decipher signals properly from long distances. This is not an option in
military applications. Risk of false passes. The aerospace and defense manufacturer
needed to improve receiver sensitivity and the accuracy of its power level measurements
in order to meet its design specifications and cost goals..."
 Nova Microwave is a leader in technically
differentiated electronic and radio frequency Ferrite
Circulators and Isolators
that connect, protect and control critical commercial and military wireless telecommunications
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design quality Ferrite Circulators and Isolators from 380 MHz to 26.5 GHz.
Available in single or multi-junction topographies, the Nova Microwave product line
of is specifically designed for use in varied environmental and temperature extremes.
 This quiz is based on the information presented
in Introduction to Antenna Analysis
Using EM Simulation, by Hiroaki Kogure, Yoshie Kogure, and James C. Rautio,
published by Artech House. It is written for novice engineers and engineering students.
This easy-to-comprehend resource offers readers thorough introductory-level treatment
of antenna analysis using electromagnetic (EM) simulators. This richly-illustrated
book shows how to use EM software to analyze and tune wireless antennas to meet
specific requirements. Readers learn important wireless antenna design terminology
and gain a detailed understanding of how antennas work. Moreover, the book offers
guidance in troubleshooting problems with wireless antenna designs...
 Berkeley Nucleonics Corporation (BNC - like
the connector) is excited to announce that our upcoming live webinar, "Low
vs. High-Resolution Detectors," is less than one week away! Demystify high-resolution
Scintillation with Berkeley Nucleonics and special guest Paul Schotanus from Scionix
as we dive into the current landscape of high-resolution detectors in the 662 KeV
Gamma range: CeBr3, LaBr3, SrI2, CLYC, and GAGG. To accommodate for time differences,
we will be hosting two sessions with the same topics and agenda. Please register
for the time slot that works best for you. U.S. Event - Wednesday, October 28th,
2020 @ 10:00 AM PST...
 PCBONLINE supplies complex rigid and flex-rigid
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 It's a pretty good bet that most RF Cafe
visitors are not overly interested in
vacuum tube testers. Today they are collectors' items with some actually still
being used for maintaining vintage electronics gear; however, in the days before
semiconductor components they were the life blood of service men. Because tubes
(aka "valves" in other parts of the world) are by nature one of the most vulnerable
parts of any product in which they are used, often the first step in troubleshooting
a radio, television, record player, etc., was to test suspected tubes for sub par
performance. As mentioned often in Mac's Radio Service Shop stories, customers balked
at service centers charging for their expertise but didn't mind as much paying for
replaced components. That meant mark-ups on vacuum tubes comprised...
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