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Homepage Archive - November 2019 (page 4)
See Page 1 | 2 | 3 | 4 of the November 2019 homepage archives.

Friday 29

X-Rays from TV Sets - Are They Harmful?

X-Rays from TV Sets - Are They Harmful?, November 1958 Radio News - RF CafeMost of us are likely familiar with the ongoing debate over whether radiation from cellphones, Wi-Fi routers and laptop computers, cell towers, smart meters, and other such modern gadgetry is harmful to humans. It is not ionizing radiation like nuclear decay, but there are heating effects that can cause damage under the right conditions. One week news breaks from the latest organization shocking the public with proof of tissue cell damage to brain, hand, face, eyeball, and groin tissue (from laptops). The next week brings a counter report refuting apocalyptic claims of previous studies... then the cycle repeats. Early in the age of ubiquitous wireless devices, those seeking to mitigate worries of radiation argued - somewhat correctly - that enough time had not yet passed to collect statistically meaningful data. If significant harm could be proven right away, dismissing the empirical results...

Russian Cows Wear VR Goggles to Increase Milk Production

Russian Cows Wear VR Goggles to Increase Milk Production - RF CafeA cure for bovine cabin fever -- "If you walked onto the RusMoloko dairy farm near Moscow, in Russia, you may think you've arrived onto a bizarre futuristic film set, where cows run around fitted with VR headsets. The VR goggles aren't props for a film, however. They have been specifically made for these dairy cows, so as to improve their conditions and enable them to relax into producing more milk. Many different industries around the world are turning more and more toward computerization to improve working conditions, so why not the farming industry too? These headsets were carefully designed by combining years of experience in the dairy farming industry, as well as technology. The pressing issue of milk production led to experts from the IT world, as well as industry leaders in milk production ..."

How Christmas Came to Sunspot McSquegg

How Christmas Came to Sunspot McSquegg, December 1953 QST - RF Cafe"The perfect squelch" was a popular concept in the 1950s. I know because I've seen it in a few different magazines from that era. In fact, The Saturday Evening Post ran a regular inset feature by that name. As you might guess, it has to do with making a short statement that has the effect of cutting out the 'noise,' whether it be from the background of a radio reception or from an obnoxious person shooting off his mouth (which was the case for the SEP). BTW, the "Squegg" part of Sunspot McSquegg's name comes from the radio term 'squeg,' which refers to oscillations due to excessive feedback, like what happens when a microphone is placed too close to the speaker. This Christmastime tidbit appeared in the December 1953 issue of QST magazine...

Exodus Intros 10 kHz - 100 MHz, 150 W Power Amplifier

Exodus Advanced Communications Intros 10 kHz - 100 MHz, 150 W Power Amplifier - RF CafeExodus Advanced Communications model AMP2080B-1 high power 10 kHz to 100 MHz amplifier produces 150 W minimum, and >200 W nominal power. The minimum power gain is >52 dB with excellent gain flatness. Optionally, Exodus offers monitoring parameters for forward/reflected power and VSWR, as well as voltage, current and temperature sensing for optimum reliability & ruggedness for all applications. Nominal weight is 35 lbs, and dimensions of 19"W x 22"L x 5.25"H. Class A/AB linear LDMOS design Rack mounted system Designed for broadband EMI/RFI, Lab, Communication applications...

Carbon Nanotube FETs Exceed 100 GHz for RF Apps

Carbon Nanotube FETs Exceed 100 GHz for RF Apps - RF Cafe"Carbonics, Inc., has demonstrated a wafer-scalable approach for producing an array of aligned carbon nanotube (CNT) FETs with performance exceeding 100 GHz and linearity of 10 dB. The firm, based on Los Angeles, is a spinout from the Center of Excellence for Green Nanotechnologies at UCLA and King Abdulaziz City for Science and Technology (KACST). Carbonics said this is the first time carbon nanotube technology has achieved speeds exceeding 100 GHz in radio frequency (RF) applications. Reported in a paper published this month, “Wafer-scalable, aligned carbon nanotube transistors operating at frequencies of over 100 GHz," it added the milestone 'eclipses' the performance - and efficiency - of traditional RF CMOS technology ..."

Nova Microwave: RF & Microwave Circulators & Isolators

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 systems. Our staff is dedicated to research and development of standard and custom 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. 

Thursday 28

Radio Wittiquiz, November 1937 Radio-Craft

Radio Wittiquiz, November 1937 Radio-Craft - RF CafeMixing a little fun with learning has always been a good motivation for students. I have written in the past about a particular electronic circuits professor I had that liked to play practical jokes during lessons and exams. Including gag options on a multiple choice test is a great way to inject a bit of tension-easing levity while at the same time eliminating one or more opportunities to guess at a wrong answer (although no relief for the truly clueless). I sometimes do that on the RF Cafe Quizzes that I generate. Radio-Craft printed a large bunch of such quiz questions under the title "Radio WittiQuiz," where the questions and answers were provided by readers. Here is one from November 1937...

Harvard's Multimaterial 3D Printer Moves at Hummingbird Speeds

Harvard's Multimaterial 3D Printer Moves at Hummingbird Speeds - RF Cafe"A new technique developed at Harvard speeds up multimaterial printing by allowing up to eight different printing materials to fabricate objects. Harvard University researchers have engineered a new fabrication method that promises to accelerate a lagging area of 3D printing technology - multimaterial printing. The technique, called multimaterial multi-nozzle 3D printing (MM3D), was developed by researchers from Harvard's Wyss Institute for Biologically Inspired Engineering and John A. Paulson School of Engineering and Applied Sciences (SEAS). MM3D uses high-speed pressure valves that continuously and seamlessly switch between up to eight different printing materials at a speed ..."

Atenlab Anechoic Chamber Sales & Service Representatives Update

Atenlab Anechoic Chamber Global Sales & Service Representatives Update - RF CafeAtenlab Corporation has updated their list of global sales representatives for the company's large variety of antenna measurement systems. Atenlab has developed four major categories of Over-the-Air (OTA) measurement systems to meet various requirements - A2 light type, A3 compact type, A6 standard type and A8 professional type. OTA measurement facilities are widely used in the communication system and device manufacturing industry. With the advancement of the OTA measurement system, customers are able to perform more comprehensive measurement and test, staying ahead in the market. Please contact one of our representatives today to learn how Atenlab can help your project succeed. Compact Antenna Test Ranges (CATR) are able to measure up to 100 GHz...

Get Your Custom-Designed RF Cafe Gear!

Custom-Designed RF-Themed Cups, T-Shirts, Mouse Pads, Clocks (Cafe Press) - RF CafeThis assortment of custom-designed themes by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins, Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart." My "Matchmaker's" design has been ripped off by other people and used on their products, so please be sure to purchase only official RF Cafe gear. My markup is only a paltry 50¢ per item - Cafe Press gets the rest of your purchase price. These would make excellent gifts for husbands, wives, kids, significant others, and for handing out at company events or as rewards for excellent service. It's a great way to help support RF Cafe. Thanks.

Custom MMIC: Off-the-Shelf and Custom MMICs

Custom MMIC- RF CafeCustom MMIC is a fabless RF and microwave MMIC designer entrusted by government and defense industry OEMs. Custom and off-the-shelf products include switches, phase shifters, attenuators, mixers and multipliers, and low noise, low phase noise, and distributed amplifiers. From next-generation long range military radar systems, to advanced aerospace and space-qualified satellite communications, microwave signal chains are being pushed to new limits - and no one understands this more than Custom MMIC. Please contact Custom MMIC today to see how they use their modern engineering, testing and packaging facility to help your project. 

Wednesday 27

Soldering Gun Doubles as Resistance Soldering Tool

Tips & Techniques: Soldering Gun Doubles as Resistance Soldering Tool, December 1973 Popular Electronics - RF CafeHere are a few good soldering tips that appeared in a 1973 issue of Popular Electronics magazine. One suggests using hot melt glue to hold components and cables in place both for soldering and just to keep them from moving during normal use. Another describes how to turn a standard pistol type soldering gun into a resistance soldering tool. It actually works pretty well for soldering sheet brass and copper, but do keep in mind that there is a live voltage between the two sections of wire when they are not making contact with the work piece. There's also a recommended method of soldering stranded or braided wire like coaxial cable shielding without having so much of the solder wick into the braid beyond where you want it (another way is to clamp a heatsink on the braid to prevent excess wicking)...

WKRP in Cincinnati: "As God As My Witness, I Thought Turkeys Could Fly"

WKRP in Cincinnati: "As God As My Witness, I Thought Turkeys Could Fly" - RF CafeAnyone who watched the WKRP in Cincinnati sitcom back in the 1970s has to remember what was one of the funniest episodes ever. Here is the 4 minutes that made Prime Time history. In this Thanksgiving episode, station owner Arthur Carlson decided he would surprise the community with good deed - that doubled as a promotional stunt for his radio station - by dropping turkeys from a helicopter for lucky shoppers at the local shopping mall. Watch the disaster unfold as Les Nessman reports live, and then hear Carlson's final comment that is still used or alluded to in many comic routines. Posting this video is an RF Cafe tradition. Have a Happy Thanksgiving!...

Bell Telephone Labs Advertisement: Pipe Circuits

Bell Telephone Laboratories Advertisement: Pipe Circuits, November 1948 Radio & Television News - RF CafeI have always been a stickler for creating neat, orderly arrangements when building any type of circuit assembly. Many moons ago when starting out as an electrician, I made a point of installing straight runs of Romex type cable with no twists, evenly spaced staples, and keeping the identification marking to the outside. Conduit was precisely bent and installed, again with organized parallel runs and even spacing where possible. Circuit breaker panel wiring looked like something seen in an Apollo space capsule (ok, I exaggerated a bit here). Electrical inspectors often complimented my work. Moving on to an electronics career, the habits carried over when prototyping and even when directing layout for production PCBs or chassis assemblies, including cabling. The greatest enjoyment I had was when laying out runs of waveguide. Standardized manufactured straight...

Bomar Crystals Company for Custom Crystals

Bomar Crystals & Osillators - RF CafeWebsite visitor Mike M. wrote a few days ago about his freshly repaired Dilbert candy dispenser, and then responded to my piece about Erie Resistor yesterday. In it was mentioned Bliley Electric, a long-time manufacturer of radio crystals, also located (still) in Erie. Being a practicing Ham operator working in CW (Morse code), Mike was looking for a company that would make a small quantity of custom crystals for him. Bliley passed on the opportunity, so he looked in his home state of New Jersey and contacted Bomar Crystal Company (unofficial motto "I gotcha crystals right hee-ya"). They have a minimum order of $100, but will make custom crystals for you. Bomar's logo has a very vintage look to it.

Many Thanks to Nova Microwave for Continuing Support!

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 systems. Our staff is dedicated to research and development of standard and custom 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. 

Hackers Use Wi-Fi to Track You in Your Home

Hackers Use Wi-Fi to Track You in Your Home - RF Cafe"As connected devices such as voice assistants, security cameras, and smart appliances grow in popularity, the homes and offices where they are installed become increasingly filled with a dense web of Wi-Fi signals. A new study from University of Chicago and University of California, Santa Barbara researchers finds that external attackers can use inexpensive technology to turn these ambient signals into motion detectors, monitoring activity inside a building without being detected themselves. With only a small, commercially available Wi-Fi receiver, an attacker from outside the target site can measure the strength of signals emitted from connected devices and monitor a site remotely for motion, sensing whether a room is occupied ..."

PCB Directory: Printed Circuit Board Fabrication & Assembly

PCB  Directory - RF CafePCB 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.

Tuesday 26

Modulating Class "C" Amplifiers

Modulating Class "C" Amplifiers, December 1944 Radio News - RF CafeOnce frequency modulation (FM) began making inroads in the commercial radio broadcast world, it wasn't long until the pundits were writing eulogies for amplitude modulation (AM). There was/is no denying the superiority of FM in terms of both natural (QRN; e.g., lightning, static, arcing contacts) and manmade (QRM; e.g., another radio) interference, but there was already a large installed base of AM radio receivers (and broadcast transmitters) that satisfied their owners' expectations for listening to news, ball games, music, and the well-established repertoire of drama and comedy shows. FM radios were generally more expensive to manufacture, operate, and repair than AM - at least early on, especially since typically FM sets included AM as well. This particular article from a 1944 issue of Radio News magazine discusses class C amplifiers...

Spectrum Instrumentation AWG Outputs Swing 24 Volts

Spectrum Instrumentation AWG Outputs Swing 24 Volts - RF CafeSpectrum Instrumentation has added six new Arbitrary Waveform Generators (AWGs) to its recently released M2p.65 xx series of PCIe cards. The new AWGs extend the product family's capabilities by boosting the available output range, so that waveforms can be generated with amplitude swings of up to ±12 V into 1 MΩ or ±6 V into 50 Ω. To achieve the higher output voltage ranges, the cards have been fitted with additional amplification and larger cooling plates. This makes the cards a little wider, so that they occupy two PCIe slots, but they are still just 168 mm in length. The small size allows them to fit into almost any PC, turning it into a powerful and flexible waveform generator. The M2p.65xx series AWGs use the latest 16-bit Digital-to-Analog Converters and feature a fast PCIe x4 interface with up to 700 MByte/s streaming speed...

Erie Resistor Corporation Ad (& Cigarette Lighter)

Erie Resistor Corporation Advertisement, December 1958 Popular Electronics - RF CafeSince I live in Erie, PA, an erstwhile very industrial, albeit small town, it is always nice to run across information on the area in my electronics magazines. There are still a few electronics businesses in Erie, but as with most of the manufacturing from long ago, high tech here is found mostly on the shelves of Best Buy and not on manufacturing lines. One notable exception is Bliley Electric Company, maker of crystal oscillators, who was established in Erie in 1930. Bliley still operates today in a building about two miles from my house. This advertisement from the December 1958 edition of Popular Electronics magazine is by Erie Resistor Company. In doing a Google search, I found a brief history of the company on a UK website. According to the author, Erie Resistor opened a division in Yarmouth in 1932. Here is a reference to Erie Resistor Company being credited for discovering the ferroelectric oxide...

Methods to Increase Channel Capacity in RF Data Links

Methods to Increase Channel Capacity in RF Data Links - RF CafeStephen Barthelmes and Patrick Sherlock of Triad RF Systems, and Ken Andrew of Non Line-of-Sight Wireless, published this article entitled, "Methods to Increase Channel Capacity in RF Data Links" in Microwave Product Digest. It begins, "As more people and organizations demand higher data rates to stream high definition (HD) video for broadcasting, surveillance, or social media applications, the need for capacity continues to increase for wireless communication systems. In addition, once more advanced technology such as 4K video becomes mainstream, performance pressure on the RF data link for mobile applications will increase to a point where current technology cannot provide acceptable performance. Applications include handheld devices (4G/LTE, 5G), as well as conventional and unmanned vehicles ..."

Radar-Based Counter Drone Solution for Airports

Radar-Based Counter Drone Solution for Airports - RF Cafe"In response to recent threats of rogue and errant drones launched against airports and other critical facilities, infrastructure and events, 34 North Drones, a leading commercial drone service provider, has partnered with IDS North America to offer and install the NO-DRONE radar counter drone system for all government and civilian clients in need of protection. IDS is a leading software company that designs, develops, and distributes software for air navigation, security, and the defense sector. The NO-DRONE radar detection system evolved from a proven and existing military battlefield solution originally tuned to recognize small objects such as incoming mortar, artillery and rocket fire ..."

Empower RF Systems: RF & Microwave Power Amplifiers

Empower RF Systems - RF CafeEmpower RF Systems is a global leader in power amplifier solutions. Empower RF Systems is an established and technologically superior supplier of high power solid state RF & microwave amplifiers. Our offerings include modules, intelligent rack-mount amplifiers, and multi-function RF Power Amplifier solutions to 6 GHz in broadband and band specific designs. Output power combinations range from tens of watts to multi-kilowatts. Unprecedented size, weight and power reduction of our amplifiers is superior to anything in the market at similar frequencies and power levels.

Monday 25

Low-Noise Synthesizer Design Examples

Low-Noise Synthesizer Design Examples - RF CafeThis is the last of a 5-part article by Farron Dacus, of Longwing Technology, entitled "Low-Noise Synthesizer Design Examples," appears in the November issue of Microwaves & RF magazine. It begins: "In the final chapter of this 5-part series, we'll look at five different synthesizer designs, comparing fully integrated synthesizers to discrete implementations. Part 1 introduced higher-order phase-locked-loop (PLL) design, while Part 2 reviewed noise sources. Part 3 analyzed noise shaping in the loop followed by Part 4, which presented commercially available parts for the low-noise PLL designer. This final article is intended to focus on the noise-performance results and tradeoffs in design examples using the low-noise techniques and parts presented earlier. Here, we compare the best performance available with fully integrated synthesizers ..."

Electronic Repair and Calibration Technician Needed by Axiom

Electronic Repair and Calibration Technician Needed by Axiom Test Equipment - RF CafeAxiom Test Equipment, an electronic test equipment rentals and sales company headquartered in North County San Diego, currently has the need for an Electronic Repair and Calibration Technician.. General Description: Service of Axiom owned electronic test equipment by performing: Calibration, installation of options, troubleshooting, refurbishing, repair and maintenance. Assist salespeople, customers and management on technical matters and equipment operation, setup and recommendations. Key Responsibilities: Functional test and inspection of equipment (purchases, rental returns and RMA returns) for proper operation and evidence of misuse, and damage. Ensures proper procedures are used to test and calibrate equipment according to manufacturer specifications...

Many Thanks to Res-Net Microwave for Continuing Support!

Res-Net Microwave has a complete line of precision RF & microwave components including attenuators, terminations, resistors, and diode detectors for commercial, military, and space applications. Products range from the small flange type to large 2,000 watt connectorized power attenuators and/or terminations at frequencies up to 26.5 GHz. In-house photo etch and laser trim capability. The company is a leader in development and production of the films required for these type of RF/microwave components. Please check out Res-Net Microwave's website to see how they can help with your current project.

Finding Relay Operate and Release Times

Finding Relay Operate and Release Times, April 1967 Electronics World - RF CafeSometimes, component datasheets can be pathetically lacking in detail for parameters that you might think would be a minimum amount of information needed in order to integrate the device into a circuit or system. Or, it may be that you found a part in a spare parts box and can't find a datasheet for it. When those times come, it is necessary to characterize the part yourself. Relay control really isn't rocket science when it comes to electrical circuits, but there are a few rules of thumb that should always be observed, the most important of which (other than not exceeding voltage and current maximums) is to wire a diode reverse biased across the coil terminals so that the voltage/current induced due to the field collapse during de-energizing does not smoke the driver circuit...

CES 2020 Consumer Electronics Show

CES 202 Consumer Electronics Show - RF CafeThe first CES (Consumer Electronics Show) took place in New York City in June 1967, making this the 54th occurrence. CES 2020 it will be held in Las Vegas from January 7th through the 10th. "CES is the world's gathering place for all those who thrive on the business of consumer technologies. It has served as the proving ground for innovators and breakthrough technologies for 50 years - the global stage where next-generation innovations are introduced to the marketplace. CES showcases more than 4,500 exhibiting companies, including manufacturers, developers and suppliers of consumer technology hardware, content, technology delivery systems and more; a conference program with more than 250 conference sessions and more than 170,000 attendees from 160 countries ..."

Drone-Based Anti-Drone Radar

Drone-Based Anti-Drone Radar - RF Cafe"Plextek-DTS is to develop a miniature drone radar to detect a hostile drone in the sky, as well as drone signal jamming technology. Radar has traditionally been too heavy for small unmanned aerial vehicles (UAVs). Plexteck-DTS has been awarded two contracts under the £2m (€2.3m) Defence and Security Accelerator (DASA) competition to develop new capabilities to detect, disrupt, and defeat the hostile and malicious use of drones. Both contracts build on Plextek's world-leading research and experience in Low Size Weight and Power (SWaP) radio systems. The first project focuses on the development of an innovative signal detection and jamming capability to detect and defeat hostile ..."

Anatech Electronics: Off-the-Shelf and Custom RF & Microwave Filters

Anatech Electronics logo - RF CafeAnatech 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. 

Sunday 24

Engineering & Science Crossword for November 24

Engineering & Science Crossword Puzzle November 24, 2019 - RF CafeFor two decades, I have been creating custom engineering- and science-themed crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. This November 24, 2019, puzzle has a holiday message for you. A database of thousands of words is used which I have built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you. The jury is out on whether or not this type of mental challenge...

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