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• Make Your Own Bluetooth Smart Beacons with Estimote Stickers (this is neat-o)
World War II brought about the first wireless remotely controlled weapons. Prior to radio technology, bombs and missiles needed to either be within a distance serviceable by detonation wires, or were set off using mechanical or electrical timers. Both of those methods required the operator to gain access to the target area at a time relatively close to when the attack was to occur. Army battalions did have warheads with spooled wires attached that enabled them to control the time of detonation and even in some instances some degree of steering, but range was limited. Wireless...
RFMW, Ltd. announces design and sales support for TriQuint's TGP2615 digital phase shifter. The TGP2615 covers Ku-band radar and communications applications in the 15-19 GHz frequency range. 6-bit control with 5.625° LSB offer high resolution and 360 degree coverage. Insertion loss of the TriQuint TGP2615 is 7 dB. RMS phase error is specified at 4° while RMS amplitude error is 1 dB...
"An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field." - Niels Bohr, as quoted by Edward Teller, in Dr. Edward Teller's Magnificent Obsession, in LIFE magazine (9/6/1954, p62)
This 60-year-old design for a coaxial line RF monitoring instrument uses components still readily available since it has no vacuum tubes and you can still buy the 1N34 germanium diodes that are used as detectors. Only 18 components (including jacks, meter, case, and switch) are used to indicate relative power, modulation percentage, and to monitor the signal modulation. Sampling is done with a high impedance tap on a through connection so that the impact on characteristic impedance on...
Environetix Technologies Corporation is a technology-transfer spin-off from the University of Maine Laboratory for Surface Science and Technology. A dynamic research and development organization, Environetix is making rapid and exciting progress in the field of passive, wireless sensor systems for harsh environments. We have current openings for both RF engineers and technicians who will participate in a team effort to develop and manufacture wireless microwave sensors for custom high- temperature harsh environment applications...
This week's Engineering crossword puzzle includes the new name conjured up by marketing gurus for the combined company formed by RF Micro Devices (RFMD) and TriQuint. According to the press release, "conveys the combined company's ability to deliver the core technologies and innovation that will enable customers to launch their next-generation designs even faster." Let me just say the name is as intuitive to me as 'Agilent' or Keysight.'
...as long as Capitalism in a Free Market environment is allowed to flourish. I know, the claim is a non sequitur, and today's Alibaba IPO is an ipso facto example. At the time of this writing, Jack Ma is worth $17.5B. Mr. Ma is a citizen of Communist China, where Chairman Mao, murderer of millions, is still idolized and his governmental tenets are still followed. Xinhua News Agency headline: "Alibaba's IPO to End US Dominance in Technology Sector." This comes as welcome news to many members of the U.S. Congress and political appointees who have publically and repeatedly cursed Capitalism...
Hugo Gernsback, in 1938, lampooned his contemporaries who boldly declared that by then there was nothing left to be invented regarding radio equipment for short wave communications. Wisely citing the well-known instance of a patent examiner who quit his post in 1870 because, as the man put it, all useful things had been invented and there was nothing meaningful left to patent, Mr. Gernsback challenged his readers to keep this article for 25 years and then go back and read it while being aware of all the new and wonderful short wave devices that had been invented since 1938...
The successful electrical engineer candidate will be responsible for the development and design of wireless control systems which will be used in Kenall lighting, emergency and signage products. The Ideal candidate will have experience using WLAN, ZigBee, Bluetooth, low-voltage control and switching circuits. Kenall products are proudly manufactured in the USA.
Thanks the incredible generosity of Artech House publishers, there are now many new engineering books available for selection to the monthly RF Cafe Book Drawing winners. The four shown here are among seven new titles.
Long before their college days at Parvoo U., our two amateur electronics sleuthing buddies were on the job tracking down and trapping bad guys by using their combined knowledge of circuits and physics. In this episode, Carl and Jerry are tasked with helping a hobby store owner stop a rash of thefts that always seems to occur during a busy time right after school lets out for the day. Their first inclination was to devise a system like the big department stores were installing that used passive tags on items that would trigger an...
The main purpose for bothering to reprint articles like this one on analog color TV theory is to reveal the complexity and ingenuity that went into cramming a lot of information into a relatively (at the time) small bandwidth. Signals within signals and signals riding on top of and below other signals was the name of the game, and pulling it off successfully required many well-designed and well-aligned circuits. Anyone old enough to remember watching a show on analog television can appreciate the difference between a high quality...
Comdel designs and manufactures RF and DC power supplies and process instruments for the semiconductor, solar cell/photovoltaics, flat panel, and industrial heating industries. Comdel products are in use worldwide by the industry's major equipment and IC fab manufacturers.
EDN's Kenneth Wyatt visited the ARRL headquarters building recently and posted a short story and some photos on the EDN website. The focus of the visit was ARRL's RF test lab and its RF interference expert, Michael Gruber, but there are also has some photos of archival items from days of yore.
Since 1994, leading wireless electronics companies have relied on 3Gmetalworx to deliver cutting edge solutions for advanced RF/EMI PCB-level shielding requirements. From prototyping and design services to JIT manufacturing supply, our clients depend on us to provide a seamless service pathway supporting entire product lifecycle.
When civil engineers and mechanical engineers take their introductory classes in hydraulics, are the taught that the functional equivalent of water pressure in a pipe is equivalent to voltage in a battery, and that the rate of water flow is equivalent to current in a circuit, and that the diameter and surface finish of pipes are equivalent to resistance in electricity... in the same manner that electronics students are taught from the opposite point of view? The answer is 'yes,' they are. It's kind of funny how for some reason using an analogy from another familiar...
At least for now, I am going to only scan and post Radio Service Data Sheets like these featuring the Philco Model 200-X, the Knight (Allied Radio Corp.) E10716 Battery Portable, and Admiral "Aeroscope" Models 161-5L, 162-5L and 163-5L Midget Set in graphical format, rather than run OCR on them to separate the textual content. 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...
Please welcome MSgt. (ret) Terry Butman as the newest member of the prestigious USAF Radar Technician Hall of Fame (unofficial, though, it is). Terry recently contacted me with his 20+ years of service information. Although not in a mobile communications group, Terry spent most of his career working on mobile radars like the MPN-13, MPN-14, and CPN-4. BTW, original manufacturer ITT Gilfillan's radar division now goes under the name Exelis.
Congratulations to Wouter U., of The Netherlands, for being one of two winners in the August RF Cafe book drawing. Wouter selected Understanding Quartz Crystals and Oscillators, by Ramon M. Cerda. I pay shipping so it costs the lucky winners nothing. Graciously provided by Artech House
There is a plethora of comics with just about any theme on the Internet: electronics, physics, mathematics, finance, amateur radio, sports, and politics, to name a few. I could provide pages full of replications for your enjoyment, but one of the best ways to sample available comics for personal consumption and/or use in reports, presentations, etc., is to use the Search function on a website like CartoonStock. The above thumbnail image is a great example of an electronically-themed comic. In it, the anatomically correct mother, father, and son socket and plug family have the inscription, "Sparky! Your mother and I are shocked at your current behavior...
LadyBug Technologies manufactures the PowerSensor™ line of miniaturized USB RF & microwave power sensors. LadyBug manufactures high accuracy average, pulse, and pulse profiling sensors with GUI interfaces covering up to 26.5 GHz and 80 dB dynamic range. These sensors set a, patented industry standard, No Zero/No Cal technology. There is no need to disconnect or wait for internal zeroing and calibration.
Decoding the Heavens: A 2,000-Year-Old Computer - and the Century-long Search to Discover Its Secrets, by Jo Marchant. Discovered a century ago in an ancient Mediterranean shipwreck, the Antikythera mechanism instantly attracted scientific interest. It had gears, which was and remains unique among artifacts from Greco-Roman civilization. So begins Marchant's mystery about the object, a tale that ends in triumph but not before inveigling individuals who not only puzzled over the device but also became obsessively devoted to figuring it out. Tantalized by the Antikythera mechanism, scholar Derek de Solla Price felt it was the clue with which he could...