Today in Science History -
Development of the
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
Technologies is transforming the Test and Measurement Industry. Our premium
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Times Microwave Systems, a pioneering brand
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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...
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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
Reactel has become one of the industry leaders in the design and manufacture
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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
for the average bond length of the molecule. This is the shortest timespan..."
It seems most of the articles we see on the
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
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The ideal candidate will have an understanding of and experience with digital, analog,
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Exodus Advanced Communications is a multinational
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ranges, we fully support custom designs and manufacturing requirements for both
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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.
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
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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
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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...
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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...