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Homepage Archive - January 2020 (page 2)
See Page 1 | 2 | 3 | 4 | 5 of the January 2020 homepage archives.

Friday 10

Electronics-Themed Comics

Electronics-Themed Comics, January 1948 Radio-Craft - RF CafeIllustrating (literally) once again the fascination the public had with television during its heyday from the late 1940s to the 1960s, this set of electronics-themed comics from a 1948 issue of Radio-Craft magazine depict the humorous situations both real and imagined for the technology. Artist Frank Beaven, a frequent contributor to the publication, took suggestions by reads and turned them into comics. The concept of multi-sensory TV experiences were common, including not just sight and sound, but also smell and tactile sensations. 3-D projection and large screens were also envisioned in the comics. The page 124 comic is my favorite as it exhibits a tried and true sales technique for securing business from guys. Interestingly, note that the comic on page 86 is credited to someone from Tel-Aviv, Palestine...

Associate RF Engineer Wanted by Empower RF Systems

Associate RF Engineer Wanted by Empower RF Systems - RF CafeEmpower RF Systems, a leading provider of high-power ultra-broadband radio frequency (RF) amplifier solutions is seeking a qualified, dynamic, successful Associate RF Engineer. Headquartered in Inglewood, California, the company was founded in 1999 and designs and manufactures solid-state, high-power RF amplifier systems and modules for commercial, scientific, and military customers worldwide. This position is located in our Inglewood headquarters and reports to the Chief Technology Officer. An Associate RF Engineer at Empower will participate in the process from proposal to end of life in the design, development, and maintenance of high power Solid-State Amplifiers and Systems targeted to the industrial, commercial and military markets. The incumbent will work with other engineers, managers, Product Management, QA, and Operations teams to develop innovative solutions that meet market needs with respect to functionality, performance, scalability, reliability, realistic implementation schedules, and adherence to goals and principles...

Thanks to Copper Mountain Technologies for Continued Support

Copper Mountain TechnologiesCopper Mountain Technologies develops innovative and robust RF test and measurement solutions for engineers all over the world. Copper Mountain's extensive line of unique form factor Vector Network Analyzers include an RF measurement module and a software application which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware via USB interface. The result is a lower cost, faster, more effective test process that fits into the modern workspace in lab, production, field and secure testing environments.

The Electrical Circuit Diagram - NAVPERS 10622

The Electrical Circuit Diagram, Basic Navy Training Courses, NAVPERS 10622, Chapter 4 - RF CafeWhile listening to the radio the other day, I heard a guy who is very technically astute and is a Ham radio operator pronounce the word "schematic" as skem-E-at-ik. He wasn't just joking because he kept saying it that way throughout the show. It came to mind while posting this chapter entitled, "The Electrical Circuit Diagram," and I thought you might appreciate it (especially if you also routinely mispronounce the word). But I digress... The U.S. Navy over the years has produced a number of series of training courses for electricity, communications, mechanics, navigation, etc., that are held in high regard by the military and private industry. Graduates of the courses who served a term of enlistment performing equipment maintenance have always been preferred by employers looking for high quality technicians...

ConductRF Performance Flexible RF Cable Assemblies

ConductRF Performance Flexible RF Cable Assemblies - RF CafeConductRF LSA series of Low Loss, Performance flexible RF Cable Assemblies, provide microwave system designers with a versatile solution for most applications. Here we offer customers a solution for 0.086" diameter cable that facilitates greater flexibility and handling or, 0.141" diameter that exploits the same great performance but with almost half the loss. Connector options include SMA, Type-N, TNC & SMP that provide excellent VSWR between DC and 18GHz, also solutions for MCX & SMB are available in a wide array of configurations. These assemblies are built using our own double shielded, FEP jacketed cable, that was developed specifically for performance solutions. With shielding effectiveness exceeding 90 dB through 18 GHz...

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. 

Thursday 9

Bell Telephone Laboratories Ad - Wire Bonding

Bell Telephone Laboratories Ad - Wire Bonding, March 1958 Radio News - RF CafeBell Labs' first positive gain semiconductor amplifier was of the point contact type where the n−type germanium base contact was conductively bonded to a metallic plate and the emitter and collector connections were made by point contact "cat whiskers." Such a contact is not mechanically robust and would not be a long term solution to semiconductor manufacturing. This full-page advertisement appearing in a 1958 issue of Radio & TV News magazine touts Bell Labs' development of a thermocompression wire bonding process whereby the combination of heat and concentrated pressure causes an atomic-level reaction between the semiconductor material and a gold interconnect wire. It proved to be very effective and reliable and paved the way for greater circuit density and packaging diversity (plastic and ceramic encapsulation vs. metal cans). Thermosonic wire bonding...

Electro-Photonics Intros 6-18 GHz Power Divider

Electro-Photonics Intros 6 - 18 GHz Power Divider - RF CafeElectro-Photonics, a market leader in RF and microwave components, has released a new thin film, surface-mount technology (SMT) power divider/combiner. The EP2D-1200R-M-001 delivers exceptional performance in a compact size due to the use of a high dielectric material, total thin film process, and integrated resistors. Its 6-18 GHz bandwidth, low insertion loss, high isolation, and low phase unbalance is perfect for use in intermodulation measurements, signal distribution for antenna arrays, and beam forming. Package size measures 0.185 x 0.160 x 0.020 inch (4.7 mm by 4.06 mm by 0.51 mm).

Promote Your Company on RF Cafe

Sponsor RF Cafe for as Little as $175 per Month - RF CafeRF Cafe typically receives 8,000-15,000 website visits each weekday and about half that on weekends. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 7,000 pages in the Google search index, RF Cafe returns in favorable positions on many types of key searches, both for text and images. New content is added on a daily basis, which keeps the major search engines interested enough to spider it multiple times each day. Items added on the homepage often can be found in a Google search within a few hours of being posted. I also re-broadcast homepage items on LinkedIn, Facebook, and Twitter. If you need your company news to be seen, RF Cafe is the place to be. Banner advertising begins at $175/month...

White Paper: RF & Microwave Terminations

White Paper: RF & Microwave Terminations (Res-Net Microwave) - RF CafeRes-Net microwave has posted a short white paper entitled, "RF & Microwave Terminations." As a manufacturer of many forms of terminations including chip, flange, stripline, coaxial rod, and connectorized, both convection and conduction cooled, Res-Net Microwave has a great deal of knowledge on the subject. The article touches on test setups, use with power dividers, combiners, circulators, and isolators with regard to VSWR, capacitance, power dissipation, temperature range, physical size, weight, and package type.

5 Things you Need to Know About OTA Chambers for 5G NR mmW Testing

5 Things you Need to Know About OTA Chambers for 5G NR mmW TestingOn January 23, 2020 at 11 am ET, Günter Pfeifer, Product Manager OTA, Rohde & Schwarz, will be presenting a webinar entitled, "5 Things you Need to Know About OTA Chambers for 5G NR mmW Testing." There is no cost, but registration is required for viewing. "Over the air (OTA) testing is gaining a lot of momentum in 5G NR, especially when it comes to mmW FR2. For OTA testing, a mobile device or base station under test must be placed in a chamber environment that provides shielding from surrounding signals. This webinar explains the main criteria for making decisions with regard to selecting a shielding chamber and provides guidance on selecting the right OTA test solution for your testing needs, from design and conformance to production testing..."

Nova Microwave: RF & Microwave Circulators & Isolators

Nova Microwave Circulators & Isolators - RF CafeNova 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. 

Wednesday 8

The Amazing "Bug" Battery

The Amazing "Bug" Battery, February 1964 Popular Electronics - RF CafeContrary to the fantastic claim made by the author of this article from a 1964 issue of Popular Electronics magazine, the "bug battery," also known as a biobattery, did not revolutionize rechargeable battery technology. In the ensuing 55+ years we have seen nickel cadmium (NiCad), nickel metal hydride (NiMH), and now lithium polymer (LiPo) batteries, respectively, do the revolutionizing. It's not that bacteria-based energy production was a bad or impractical endeavor; it's just that advances did not proceed quickly enough to keep up with the other technologies. Research and development efforts inevitably moved away from bug and onto chemicals. D.S. Halacy, Jr., of course had no way of knowing that at the time, so his enthusiasm might have been justified. I say might have been because then, as now, every new idea and technology has its die-hard evangelists...

Model 855B 40 GHz Multi-Channel Signal Generator

Berkeley Nucleonics Model 855B Multi-Channel Signal Generator - RF CafeAdvancements in phased-array antenna systems have brought about major developments in radar, mobile communications and satellite broadcasting. The Berkeley Nucleonics Model 855B, 300 kHz to 40 GHz Multi-Channel RF / Microwave Signal Generator, is used as an internal LO source in many of the new state of the art phased array antennas. Communication with conventional satellites requires one to focus a narrow electromagnetic frequency beam at the satellite (parabolic surface). Due to the antenna's size and weight, it can be quite difficult and costly to track a satellites' movement. Phased arrays, however, are composed of several smaller, fixed antennas. By changing the relative phase for the signal that each unit transmits...

Many Thanks to Atenlab for Their Continued Support!

Atenlab microwave components - RF CafeAtenlab has been operating in Taiwan for more than a decade, and has sold and installed hundreds chambers around the world. Holistic Over-the-Air (OTA) measurement systems perform comprehensive measurement and test in a controlled environment. Compact Antenna Test Range (CATR) with one-touch operation supports multiple systems - 2G, 3G, 4G, 5G - and major instrument brands. [M]ulti-probe OTA measurement systems offer reduced time measurements over single-probe systems.

Mac's Radio Service Shop: Intermittents Still Pursue

Mac's Radio Service Shop: Intermittents Still Pursue, February 1949 Radio & Television News - RF CafeMac McGregor, owner of Mac's Radio Service Shop, can always be counted on to provide his apprentice technician, Barney, with a lesson from his own life-long attendance at the School of Hard Knocks. Barney is your stereotypical young buck whose level of seriousness needs occasional alignment, just as do the radio and television sets he services. In this episode, I can't find where Mac actually solved the intermittent electrical condition believed to be causing the problem - weird. The "Mac's Radio Service Shop" series ran in Radio & Television News magazine for many years prior to a similar electronics story series called "Carl & Jerry" that appeared in Popular Electronics. Both were created by consummate storyteller John T. Frye.

Design PCBs for EMI: More on Partitioning

Design PCBs for EMI: More on PartitioningMr. Kenneth Wyatt posted on the EDN website part 4 of his series entitled, "Design PCBs for EMI," this time covering partitioning on the PCB. It addresses a long-standing debate about how to best isolate analog and digital grounds on mixed signal boards. He begins, "Part 3 of this series on PC board design for low EMI discussed partitioning and why that's important to keep 'noisy' signal fields from cross-coupling to 'quiet' signal fields within the board's dielectric space. In this article, I'll provide more detail on partitioning. While the concept of partitioning is simple enough, real boards usually require a little more thought. Partitioning is especially important when it comes to mixed-signal designs, such as a combination of analog and digital or wireless and digital..."

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 7

Military Communications

Military Communications, December 1944 Radio News - RF CafeYou've to to take a look at this article if only to see the comic. Mentioned but not expounded upon is the man who was the progenitor of the U.S. Army's Signal Corps (beginning in 1860), Major Albert J. Myer, a medical doctor who took up long distance communications as a hobby. As an extension of his interest in Morse code, he developed a system of using a lantern (nighttime) or a signal flag (daytime) to effect a visual form of code. It was dubbed "wig-wag signaling," or "aerial telegraphy." Unless some sort of cryptographic encoding was used, the messages could be easily intercepted by enemy forces, but it served both sides well until wireless sets were available. Coming in the middle of World War II, this Radio News magazine article summarizes the electronic communications capabilities...

Promote Your Company on RF Cafe

Sponsor RF Cafe for as Little as $175 per Month - RF CafeRF Cafe typically receives 8,000-15,000 website visits each weekday and about half that on weekends. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 7,000 pages in the Google search index, RF Cafe returns in favorable positions on many types of key searches, both for text and images. New content is added on a daily basis, which keeps the major search engines interested enough to spider it multiple times each day. Items added on the homepage often can be found in a Google search within a few hours of being posted. I also re-broadcast homepage items on LinkedIn, Facebook, and Twitter. If you need your company news to be seen, RF Cafe is the place to be. Banner advertising begins at $175/month...

Fake News: "Results of Tests on Cell Phone RF Exposure Compliance"

FCC Report: Results of Tests on Cell Phone RF Exposure Compliance - RF CafeFCC Report - RF CafeOn December 10, 2019, the FCC released a very interesting report entitled, "Results of Tests on Cell Phone RF Exposure Compliance." It included certain models by Apple, BLU Products, Motorola, and Samsung that were accused by the Chicago Times newspaper on August 21, 2019, of exceeding radiation levels deemed to be safe. The article, "We tested popular cellphones for radio frequency radiation. Now the FCC is investigating." Guess what? It was more grandstanding Fake News by the media seeing to whip the public into a frenzy with much ado about nothing. The Federal Communications Commission declares, "...all tested sample devices comply with the FCC RF radiation exposure." If a retraction is printed, it'll likely be buried deep inside next to the obituaries.

Cyberwarfare: An Introduction to Information Age Conflict

Cyberwarfare: An Introduction to Information Age Conflict (Artech House) - RF CafeArtech House today announced the publication Cyberwarfare: An Introduction to Information Age Conflict, by Isaac R. Porche, III. Conflict in cyberspace is becoming more prevalent in all public and private sectors and is of concern on many levels. As a result, knowledge of the topic is becoming essential across most disciplines. This book reviews and explains the technologies that underlie offensive and defensive cyber operations, which are practiced by a range of cyber actors including state actors, criminal enterprises, activists, and individuals. It explains the processes and technologies that enable the full spectrum of cyber operations. Readers will learn how to use basic tools for cyber security and pen-testing, and also be able to quantitatively assess cyber risk...

Custom MMIC Releases Record Number of High Performance MMICs in 2019

Custom MMIC Releases a Record Number of High Performance MMICs in 2019 - RF CafeWith 2019 now officially in the history books, Custom MMIC is proud to have set a new company milestone with the release of 39 new high performance GaAs and GaN MMICs in 2019. This impressive accomplishment highlights our ability to quickly introduce high quality production ready MMIC products. This includes low noise amplifiers, low phase noise amplifiers, driver amplifiers, distributed amplifiers, mixers, phase shifters, switches, and variable attenuators. View our newly redesigned 2020 Product Selection Guide to see our latest GaAs and GaN MMIC products.

Choosing the Right Antenna for Today's Testing Requirements

Choosing the Right Antenna for Today's Testing Requirements - RF CafeA.H. Systems has a nice free webinar entitled, "Choosing the Right Antenna for Today's Testing Requirements." Per the webpage, "How to choose the correct EMC test antenna based upon the requirements of the standard. A simple guide to determining the correct choice of antenna to match the test required. RF veteran Tom Mullineaux in collaboration with the experts at A.H. Systems presents the basics and a framework for beginners, as well as more advanced topics for intermediate and advanced test engineers - such as antenna beamwidth and how to address it. All levels of EMI test engineers, technicians and managers will benefit from this presentation."

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 6

Du Mont Television Advertisement

Du Mont Television Advertisement, January 1948 Radio-Craft - RF CafeThe Allen B. Du Mont Laboratories was one of the earliest manufacturers of television sets for consumer purchase. They were in operation long before committees like the NTSC were formed to standardize television broadcast signal formats. There were various methods competing for reproducing the image at the receiver end - including electromechanical and purely electronic schemes. Regular readers of electronics magazines like this edition of Radio-Craft followed the evolution of TV with great, though somewhat guarded,  enthusiasm. As with many technologies that seemed at the time to have mostly commercial and consumer applications, development during the war years yielded to the needs of victory for the Allied forces. Television prices were relatively high even in the late 1940s, so most households still did not have a TV set; radios still ruled in the domestic entertainment realm...

VidaRF Adds 2-18 GHz Power Divider Series

VidaRF Adds 2-18 GHz Power Divider / Combiner Series - RF CafeVidaRF, a manufacturer of high performance RF and microwave high performance circulators, isolators, couplers, power dividers, and other passive components, has expanded it line of broadband RF power dividers / combiners with low VSWR and insertion loss and high port-to-port isolation to cover 2 to 18 GHz for all wireless applications from cellular through 5G mm-wave with SMA connectors. The Model VPD-20180AX series offers 2-, 3-, 4-, 6-, 8-, 32-, and 64-way splits. Operating temperature is & −55°C to −85°C. Sealed and Painted to meet IP65 standards.

Please Welcome Exodus Advanced Communications as a Supporter

Exodus Advanced Communications - RF CafeExodus 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.

Start-up to Deliver Dynamic Spectrum Mapping

Start-up to Deliver Dynamic Spectrum Mapping - RF Cafe"The radio frequency environment in which wireless networks and devices operate is incredibly complex - and completely invisible. But what if instead of sending out teams for drive-testing to get a snapshot of that RF environment on a given day in a given place, you could pull up a dynamic map that showed links, congested areas, coverage holes and other features as layers of information, down to moment-by-moment changes? Aurora Insights is a start-up that began with the idea of better information for RF planning through 'dynamic mapping' for RF and RF links, according to CEO and co-founder Brian Mengwasser. He compares traditional drive-testing..."

3D EM Simulation of Antennas Installed on Aircraft

3D Electromagnetic Simulation of Antennas Installed on Aircraft - RF CafeIEEE and Dassault Systems is presenting a free online seminar entitled "3D Electromagnetic Simulation of Antennas Installed on an Aircraft." Per their website, "Learn about the importance of using a range of methods in the 3D electromagnetic (EM) simulation of installed antenna performance. 3D EM full-wave simulation is a common practice for antenna designers and Analyst. The variety in antenna topologies and design specifications necessitate a range of simulation algorithms to ensure an efficient or even feasible solution is available. This range of technology becomes even more important as antennas' operation in the installed environment is considered. The application of different EM methods as well as hybridization..."

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 5

Engineering & Science Crossword Puzzle for January 5

Engineering & Science Crossword Puzzle January 5, 2020 - RF CafeAs with my hundreds of previous engineering and science-themed crossword puzzles, this first one of the new decade, January 5, 2020, contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc., which I have built up over nearly two decades. Many new words and company names have been added that had not even been created when I started in the year 2002. 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...

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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

1996 - 2024


Kirt Blattenberger,


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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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