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Homepage Archive - February 2019 (page 2)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page. About RF Cafe.

Homepage Archive Pages

2019:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2018:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2017:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2016:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2015:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec


See Page 1 | 2 | 3 | 4  of the February 2019 homepage archives.
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Friday 15

Mac's Radio Service Shop: Unusual New Equipment

Mac's Radio Service Shop: Unusual New EquipmentJohn T. Frye's monthly "Mac's Radio Service Shop" techno-drama, written in story form - was usually an incognito lesson on circuit functionality or troubleshooting, how to deal with customers, industry regulations and news, or an introduction to new components and equipment. As the "Unusual New Equipment" title suggests, this time Mac described a few new items added to the service shop to aid in their work. Often when reading one of the episodes, I do a Google search on specific components or equipment mentioned in the article. He describes a special-purpose CRT (Sylvania's new 5AXP4 Television Receiver Check Tube) that could be used universally for troubleshooting in place of a wide variety of installed picture tubes. I found one for sale on eBay for $39.95. There is not much you cannot find on eBay if you watch long enough ...

ConductRF Precision D38999 RF & Mixed Signal Cables

ConductRF Precision D38999 RF & Mixed Signal Cables - RF CafeConductRF offers an extensive line of RF and mixed signal cable harnesses and assemblies with custom configurations, lengths and markings. Thousands of combinations of coaxial, power, and digital and analog signal connectors available. Flexible phase-stable, low-loss, phase-matching, high power, and other options per your requirements. Broad insert connector solution choices including BMA, SMPM, for cable sizes #8, #12 & #16 Custom marking and ruggedization enhancements capability. Contact ConductRF today and let us help your project ...

Jean Shepherd on Getting His Class A Amateur Radio License

Jean Shepherd on Getting His Class A Amateur Radio License - RF CafeNot very long ago I mentioned Jean Shepherd (original assignee of W9QWN and later K2ORS call signs) as being one of my favorite old-time radio broadcasters (1960s-1970s). Jean was famous for recounting stories of his own life and for reporting news of the time in a way that could hold you in rapt attention from beginning to end. His humor, wit, and command of the English language was acknowledged by his contemporaries. If you listen to enough of his broadcasts you will notice the frequent mention of electronics and his experiences as a licensed amateur radio operator beginning at a tender young age. Just recently I listened to him recount his first day in high school when a SNAFU in the computer-generated (must have been a UNIVAC) class schedule mistakenly had him reporting to the girls' swimming pool ...

R&S App Note: Group Delay Measurements with Signal and SpecAn

Rohde & Schwarz App Note: Group Delay Measurements with Signal and Spectrum Analyzers - RF CafeRohde & Schwarz USA (R&S USA) has published an application note titled, "Group Delay Measurements with Signal and Spectrum Analyzers." The available bandwidth of RF channels are often limited by the bandpass characteristic of filters, amplifiers and mixers. Detecting amplitude flatness and phase distortion is crucial in characterizing the quality of a transmission channel. The amplitude flatness within the used bandwidth may have an influence on the signal quality. Knowledge about phase distortion is essential to maintain low bit error rates in data transmissions and VNAs (Vector Network Analyzer) commonly perform amplitude flatness and phase distortion measurements. Phase distortions in a transmission channel are determined using group delay measurements, they must be as low as possible to maintain good signal quality ...

New Type of Magnet Discovered

New Type of Magnet Discovered - RF cafe"A team of scientists has discovered the first robust example of a new type of magnet - one that holds promise for enhancing the performance of data storage technologies. This 'singlet-based' magnet differs from conventional magnets, in which small magnetic constituents align with one another to create a strong magnetic field. By contrast, the newly uncovered singlet-based magnet has fields that pop in and out of existence, resulting in an unstable force - but also one that potentially has more flexibility than conventional counterparts. 'There's a great deal of research these days into the use of magnets and magnetism to improve data storage technologies,' explains Andrew Wray ..."

Many Thanks to Bittele Electronics for Continued Support!

Bittele Electronics PCB Fabrication - RF CafeSince 2003, Bittele Electronics has consistently provided low-volume, electronic contract manufacturing (ECM) and turnkey PCB assembly services. It specializes in board level turnkey PCB assembly for design engineers needing low volume or prototype multi-layer printed circuit boards. Free Passive Components: Bittele Electronics is taking one further step in its commitment of offering the best service to clients of its PCB assembly business. Bittele is now offering common passive components to its clients FREE of Charge ...

Thursday 14

Howard W. Sams and Co., Inc. Photofacts

Howard W. Sams and Co., Inc. Photofact, May 1956 Radio & Television News - RF CafeHaving recently struggled a little with re-stringing the dial cord on a vintage Realistic (Radio Shack) Patrolman−50 Radio, it really became apparent why the Sams Photofact Folders were of such value to electronics servicemen. Unlike the tangled mess of dial cord shown in the ad, I had the advantage of being able to carefully open the chassis and photograph the routing and wrapping of the broken dial cord around pulleys and shafts. Even so, a lack of experience required some trial and error to get the tensioning correct. No doubt many unqualified radio owners attempted to fix their own broken dial cords prior to breaking down and committing to spending a few bucks to have a pro do it correctly. The tight quarters in my portable radio had me using tweezers to do some of the routing ...

5G MMIC PA Design Webinar Features NI AWR Software

5G MMIC PA Design Webinar Features NI AWR Software  - RF CafeOn March 6, 2019, at 11 a.m. ET, NI AWR software will be featured in an upcoming webinar titled, "GaN Electrothermal Modeling for 5G MMIC Power Amplifier Designs." Featured is a 0.15 micrometer (μm) gallium nitride (GaN) process for 5G monolithic microwave integrated circuit (MMIC) power amplifiers (PAs). Presented by Eric Leclerc, field marketing manager at United Monolithic Semiconductors (UMS), the webinar examines the characterization of a short gate-length process for millimeter wave (mmWave) applications up to 40 GHz. The models developed by UMS are being organized into a process design kit (PDK) for the NI AWR Design Environment platform, specifically Microwave Office circuit design software, for release later this year. The resulting PDK will support the development of MMICs targeting mmWave telecommunications ...

Norman Rockwell Paintings with Radio Themes

Norman Rockwell Paintings with Radio Themes - RF CafeMy mother loved Norman Rockwell paintings for their ability to get to the heart of Americana. She was an avid collector of books on Rockwell and decorated plates for display - as avid as one can be on my newspaper classified ad manager father's feeble salary, anyway. I, too, have a great appreciation for Rockwell's great talent to choose his subject matter and models and to, when fitting, include a nearly photographic level of detail within. The Saturday Evening Post magazine featured many of his works spanning from 1916 until 1971 - from the middle of World War I and on through World War II, Korea, and Vietnam. Summer, spring, fall, and winter; Christmas, Easter, Veteran's Day, President's Day, Mother's Day, New Year's, and other annual events; experiences of love, happiness, joy, surprise, sadness, and a host of other emotions ...

Saelig Intros D20305G RF Downconverter to Extend Range of SpecAn

Saelig Intros D20305G RF Downconverter to Extend the Range of Existing Spectrum Analyzers - RF CafeSaelig Company announces the compact ThinkRF D2030 RF Downconverter, engineered to work seamlessly with existing spectrum analysis equipment by down-converting RF signals from the 27-30 GHz frequency bands down to an intermediate frequency (IF) of 3.55 GHz or 5.6 GHz. The D2030 RF Downconverter works with existing test equipment, RF signal detectors, and interfaces, minimizing user training requirements, and enabling these products to offer 5G analysis capabilities. This RF downconverter features 10 MHz input and output clock references for multi-unit synchronization. As 5G mobile and wireless communication technologies continue to draw on wider bandwidths and higher frequencies, users can run multiple D2030 ...

Si-Based Electronically Steered Ku-Band Antenna Array for Mobile

Si-Based Electronically Steered Ku-Band Antenna Array for Mobile - RF Cafe"SatixFy UK Limited introduced the world’s first ESMA (Electronically Steered Multi-Beam Array) Ku-band 256 element array antenna at this week's SmallSat Symposium 2019 in Mountain View, CA. Utilizing the company's fully digital beam forming technology, the new antenna array is being demonstrated working in an Antenna Micro Test Range to show multi-beam capabilities, antenna patterns and other performance parameters. The ESMA antenna can serve both as a stand-alone IoT terminal or a building block for a larger sized antenna and is currently available in 11-12 GHz receive and 13.75-14.5 GHz transmit frequencies. SatixFy is in the final stages of developing a complete terminal with an integrated SatixFy modem based on its ASIC ..."

Windfreak Technologies: USB-Powered RF Synthesizers, Mixers

Windfreak TechnologiesWindfreak Technologies designs, manufactures, tests and sells high value USB powered and controlled radio frequency products such as RF signal generators, RF synthesizers, RF power detectors, mixers, up / downconverters. Since the conception of WFT, we have introduced products that have been purchased by a wide range of customers, from hobbyists to education facilities to government agencies. Worldwide customers include Europe, Australia, and Asia. Please contact Windfreak today to learn how they might help you with your current project ...

Wednesday 13

Is Stratovision the Answer?

Is Stratovision the Answer?, January 1950 Radio & Television News - RF Cafe'Stratovision' sounds about as serious as 'Wonkavision,' but unlike the candy maker's fictional machine that transported chocolate bars across the room, Stratovision was in fact a serious proposal. It was an early form of satellite television. Since orbiting communications satellites would not be practical for another decade, Westinghouse devised a system in 1945 using aircraft flying at high altitude to relay television signals. Engineers calculated that 14 airplanes circling at 25,000 feet could provide coverage to 78% of the country. By 1950 they had a working system, but needless to say (because nobody has ever heard of it... except you, now), the concept ultimately did not pan out. It was not because the system failed to work as designed, but because there was not enough demand ...

Modelithics Releases the Complete Library v19.0 for Keysight ADS

Modelithics Releases the COMPLETE Library v19.0 for Keysight Advanced Design System - RF CafeModelithics® has released version 19.0 of the COMPLETE Library for Keysight Advanced Design System. Version 19.0 is compatible with the latest ADS release, ADS 2019, and adds 52 new models for passive and active components from multiple leading vendors. The Modelithics COMPLETE Library™ is a collection of highly accurate scalable simulation models for many passive component families and active devices. Advanced model features include substrate scaling, pad scaling and part value scaling for LCR component series, and bias-dependence and temperature effects for active devices. All models are validated with precision broadband measurements and come with a detailed model datasheet ...

Evolution of the Phonograph

Evolution of the Phonograph, May 1956 Radio & Television News - RF CafeWhile not a second-hand store junkie, I do like to occasionally make the rounds of the local Salvation Army, Goodwill, and other independent shops to see what kind of relics are donated. Since eBay, Etsy, and their kind have gained immensely in popularity, it is getting harder to find anything useful other than clothes and kitchen wares. A few months ago Goodwill had a 1910s vintage cabinet -style Edison disc phonograph (as opposed to wax cylinder) that was in very good condition, complete with a handful of styli and a couple old records. The original finish over smooth mahogany and burl veneers had only a few scratches and could easily be polished to look practically new. The metal hardware could have stood a fresh coat of black paint due to nearly a century of oxidation. Even the original nomenclature plate looked factory-new, and a clearly legible paper plaque ...

Z-Communications Intros Extremely Low Noise X-Band PLO

Z-Communications Intros Extremely Low Noise X-Band PLO - RF CafeZ-Communications announces a new RoHS compliant fixed frequency phase locked loop model SFS9280C-LF operating in the X-band. The SFS9280C-LF is a plug and play PLO allowing for quick integration and designed to produce a fixed signal at 9280 MHz when utilized with an external 10 MHz reference oscillator. This simple to use PLO features a typical phase noise of -80 dBc/Hz, -100 dBc/Hz, and -120 dBc/Hz at the 1 kHz, 10 kHz and 100 kHz offsets, respectively. The SFS9280C-LF is designed to deliver an output power of 0۬±3 dBm while operating off a VCO voltage supply of 5 Vdc and drawing 90 mA and a phase locked loop voltage of 3 Vdc while drawing 11 mA. This unmatched product features a typical harmonic suppression of -30 dBc and spurious suppression of -65 dB ...

How Can Chiral Helices Create a Spin Current?

How Can Chiral Helices Create a Spin Current? - RF Cafe"When it comes to realizing low-power electronic devices, spintronics looks promising. However, to generate a suitable spin current, you need a relatively large magnet. An alternative method that uses a special type of molecule has been proposed, but the big question is: does it work? Researchers have constructed a theoretical model which describes how to put this new method to the test. When it comes to realizing low-power electronic devices, spintronics looks promising. Spin is a quantum-mechanical property of electrons that can best be imagined as electrons spinning around their own axis, causing them to behave like small compass needles. A current of electron spins could be used in electronic devices. However, to generate a suitable spin current ..."

San Francisco Circuits: PCB Fabrications & Assembly Service

San Francisco CircuitsSF Circuits' specialty is in the complex, advanced technology of PCB fabrication and assembly, producing high quality multi-layered PCBs from elaborate layouts. With them, you receive unparalleled technical expertise at competitive prices as well as the most progressive solutions available. Their customers request PCB production that is outside the capabilities of normal circuit board providers. Please take a moment to visit San Francisco Circuits today ... 

Tuesday 12

Bell Telephone Laboratories - Circular Waveguide Invention

Bell Telephone Laboratories, June 1955 Radio & Television News - RF CafeAccording to this full-page advertisement in the June 1955 issue of Radio & Television News magazine, Bell Telephone Laboratories was responsible for designing and fielding "waveguide pipe," aka flexible circular waveguides. According to other historical sources, both George Southworth of Bell Telephone Laboratories and Wilmer Barrow of the Massachusetts Institute of Technology (M.I.T.) independently and simultaneously developed circular waveguide, but the early devices were rigid pipe rather than being fabricated from tightly wrapped, insulated wire that permitted it to be bent rather than requiring separate corner and offset pieces. Insertion loss and VSWR is typically not as good as with rigid waveguide, but the ease of installation in many situations justifies the poorer electrical performance. Bell Telephone Laboratories was responsible ...

HAM RADIO 2019 Set for June 21-23

HAM RADIO 2019 Set for June 21-23 - RF CafeHAM RADIO 2019 and the 70th Lake Constance Convention, both organized by the Deutscher Amateur Radio Club (DARC), Germany’s International Amateur Radio Union (IARU) member-society, will take Friday, June 21, until Sunday, June 23, in Friedrichshafen on Lake Constance. "We very much hope that, again, many representatives of the IARU member-societies will be able to attend HAM RADIO," said DARC Secretary for International Affairs Thomas Wrede, DF2OO. An informal meeting for representatives of IARU member-societies will take place on June 21. Youth days and a ham rally will take place on Friday and Saturday ...

EverythingPCB Has Resources for Guess What? PCBs!

EverythingPCB - RF CafeDanny, from EverythingPCB, wrote recently asking me to let RF Cafe visitors know about his award-winning website. "EverythingPCB is a Printed Circuit Industry product, service and resource guide listing everything from software to manufacturers to assembly services and everything in-between. This service was created by and for professionals in the printed circuit board industry to provide faster access to telephone numbers, addresses, web sites, product listings and other information that is typically available through other publications. Industry professionals can now perform instantaneous searches by product or company, or with the click of a mouse, hyperlink to the companies web page ...

Drone-Based Field Measurement System™ (dB-FMS)™

Drone-Based Field Measurement System™ (dB-FMS)™ - RF CafeIf you were hanging around here in 2014, you might recall a paper I published titled, "Drone-Based Field Measurement System™ (dB-FMS)™." Since that time, I have seen news items about a few companies using drones to measure antenna radiation patterns (here, here, here, here, and many more - others are coming online all the time). Some amazing working systems have been implemented that seem to perform very well. I'm not saying they got the idea from my article because more than one person can have the same brilliant idea ;-). It's just good to know that my concept had some merit in the real world ...

VidaRF Intros Broadband, Low Magnetic Field Coaxial Isolator for 8-18 GHz

VidaRF Intros Broadband, Low Magnetic Field Coaxial Isolator for 8-18 GHz - RF CafeVidaRF, a manufacturer of high performance RF and microwave high performance isolators, circulators, power dividers, couplers, and other passive components, is proud to introduce the VCI-80180-X. The VCI-80180-X is a Broadband, Low Magnetic Field Coaxial Isolator that operates from 8 − 18 GHz. It provides isolation of 16 dB with an insertion loss of 0.70 dB and a VSWR of 1.40:1. The device can handle average power of 5 W (forward) and 1 W (reverse). It is available in a module format with SMA connectors. These Isolators are stackable for space savings. VidaRF's product line includes drop-in, coaxial, and waveguide configurations for many items. Custom designs available ...

Octagonal Cell Topology for High-Frequency Silicon Carbide Transistors

Octagonal Cell Topology for High-Frequency Silicon Carbide Transistors - RF Cafe"Kijeong Han and BJ Baliga of North Carolina State University in the USA have developed 4H-polytype silicon carbide (4H-SiC) octagonal cell power metal-oxide-semiconductor field-effect transistors (MOSFETs) with reduced gate capacitance and charge, giving improved high-frequency figures of merit (HF-FOMs) over conventional linear-layout devices. The work represents the first 'experimental demonstration of improved HF-FOMs for 4H-SiC power MOSFETs by using an octagonal-cell topology,' according to Han and Baliga. The devices were aimed at 1.2kV-rating applications. The accumulation-mode channel (Accu) 'OCTFET' used straight-edged structures ..."

Alliance Test Equipment: Used & Refurbished, Purchase & Rental

Allied Test Equipment Products - RF CafeAlliance Test sells used / refurbished test equipment and offers short- and long-term rentals. They also offer repair, maintenance and calibration. Prices discounted up to 80% off list price. Agilent/HP, Tektronix, Anritsu, Fluke, R&S and other major brands. A global organization with ability to source hard to find equipment through our network of suppliers. Please visit Allied Test Equipment today to see how they can help your project ...

Monday 11

Transient Specialists Exclusive Distributor for Teseq & EM Test

Transient Specialists Now Exclusive ESD Simulator Distributor for Teseq & EM Test - RF CafeTransient Specialists, a leader in EMC test equipment for over 30 years, announces that they will be the sole U.S. Distributor for both Teseq and EM Test electrostatic discharge generators. They offer quick delivery times and options for A2LA accredited calibrations upon request. With a large inventory of rental simulators, they provide an ideal solution when looking to test a simulator before purchase. Many of the simulators, including the NSG 435, NSG 437, and NSG 438 have the ability to test to a variety of standards and applications. These immunity test generators have the ability to test to 30 kV and offer a variety of networks. Transient Specialists, conveniently located in the mid-west, also offers a variety of EMC test equipment rentals ...

Don't Lose Your Mobile Rig

Don't Lose Your Mobile Rig, May 1967 QST - RF Cafe"If the car is parked in a dark remote spot it is better to do the job where the car is. This is because auto burglary is a lesser crime than stealing the whole damn car." That remark was made by a 'former' thief who ostensibly gave up a life of crime after spending nearly two decades in the slammer for various infractions of the law. One of his specialties was breaking into cars to steal radios - AM, FM, CB, Ham, or whatever was available. Mr. X volunteered his insight for the benefit of QST readers who might want to take proactive steps to help minimize the chance of being a victim. The year was 1967, but you can bet the same mindset pervades the thinking of modern day break and grab thieves today. Even though most modern portable electronics equipment is protected from access by passwords, that wouldn't stop a thief from stealing ...

Finding the Right Oscilloscope for Your Next IoT Measurement

Finding the Right Oscilloscope for Your Next IoT Measurement - RF CafeErin Stucker, of Axiom Test Equipment, let me know about a new blog on his Axiom test Equipment website titled, "Finding the Right Oscilloscope for Your Next IoT Measurement." It begins, "As much as the Internet has become as part of daily lives and businesses, the Internet of Things (IoT) and billions of tiny electronic devices will soon provide the means to quickly identify an unlimited number of associated things at home, in businesses, even for personal health. The oscilloscope, with its measurement flexibility and versatility, will be an important tool in helping to design and maintain the many low-power IoT sensors that will be needed in the future. Of course, all oscilloscopes are different ..."

JP Wilson Joins the USAF Radar Shop List

MPN-14 Control Center, Zaragoza AB, Spain (JP Wilson) - RF CafeJP Wilson ran across my list of fellow USAF radar maintenance techs (AFSC 303x1), and graciously provided this photo of the MPN-14(G) mobile radar control center he worked on at Zaragoza AB, Spain, in the late 1970s. Interestingly, one of my Keesler tech school classmates, Jim Flinn, was his replacement at K.I. Sawyer AFB, Michigan, in 1979. If you were - or still are - a USFA Radar Shop tech and would like to be added alongside your comrades, please send me an e-mail with your service info. Equipment photos are especially welcome since people love seeing reminders of their past - an era when everyone wasn't running around with a camera in a cellphone ...

NGMN Paves Way for Development of 5G Patent Licensing Practices

NGMN Paves Way for Development of 5G Patent Licensing Practices - RF Cafe"The Next Generation Mobile Networks (NGMN) Alliance has organized and executed a successful conference on Licensing Practices in 5G Industry Segments with the International Telecommunication Union (ITU), bringing various experts from around the world together to discuss licensing practices and challenges of 5G. The conference featured moderators and speakers from some of the biggest names in telecoms, including AT&T, Deutsche Telekom, NTT DOCOMO, Orange, Ericsson, Nokia, and Microsoft. Also in attendance were key stakeholders of vertical industries, including Audi, Bosch, Panasonic and u-Blox, and patent pool administrators, namely Avanci, MPEG-LA, Sisvel and Via Licensing, who co-sponsored the event, the European Telecommunications Standards Institute ..."

VidaRF: Passive RF & Microwave Components

vidaRF passive RF & microwave components - RF CafeAt VidaRF, the phrase 'Providing Simple Solutions for Complex Connections' is more than just a slogan – it's a mindset, a mission, and a driving force behind everything we do. Their pledge is to design and distribute high performance, cost effective RF Microwave products to fit each customer's unique applications. Please visit VidaRF today to see how their lines of attenuators & terminations, directional couplers, power dividers, coaxial connectors, and circulator & isolators can be of use to your project. "When the standard just will not do, VidaRF has the solution for you!" ...

Sunday 10

RF Cafe Engineering & Science Crossword Puzzle for February 10

RF Cafe Engineering & Science Crossword Puzzle February 10, 2019Beginning in 2000, I have created hundreds of custom technology-themed crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. The jury is out on whether or not this type of mental challenge helps keep your gray matter from atrophying in old age, but it certainly helps maintain your vocabulary and cognitive skills at all ages. A database of thousands of words has been 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 start like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you ...

Thanks to Transient Specialists for Continued Support!

Transient Specialists - RF CafeTransient Specialists specializes in EMC test equipment rentals and carries a complete line of ESD guns, surge immunity test equipment, and EFT generators. Rentals available for military (Mil-Std 461), automotive (ISO 7637), and commercial (IEC 61000-4) EMC testing. Flexible terms, accredited calibrations and technical support on EMC testing equipment offered. Equipment consists of top EMC Test System manufacturers, including Teseq, Thermo Keytek, EM Test and EMC Partner ...

  
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Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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