Homepage Archive - October 2020 (page 2)

Thursday 14

The Radio Month

"The Radio Month" was a regular feature in Radio-Electronics magazine in the late 1940s and early 1950s. It contained news items from around the industry and across the world. The entire two pages are included in the included scan, but a couple items in particular stand out that are worth mentioning. The first is announcing the soon to be available rectangular cathode ray tubes (CRT) for television. Until then, the actual CRTs had round faces even though the displayed image was rectangular. A 4:3 aspect ratio was the standard, which required the tube diameter to be roughly 25% larger than the horizontal size of the picture. In fact, that is how TV display sizes came to be rated by their "diagonal" dimension rather than the picture width, and the standard stuck even after rectangular tubes were available. For instance, the 4:3 aspect ratio conveniently produces a diagonal length of 5 (the 3:4:5 triangle), where the hypotenuse...

UCAV-Based High-Energy Laser Weapon

"The deployment of an airborne platform armed with a High Energy Laser (HEL) weapon has been a major challenge for several decades. Attempts in the past included mounting a HEL weapon in large aircraft like a Boeing 747, mainly for strategic missions like defense against tactical ballistic missiles. Despite being very promising in their initial phases, these trial configurations presented various technical and economic issues that resulted in their cancellation. Recently, the focus has shifted from strategic missions to tactical missions. That means that HEL weapons of lower power and, consequently, decreased size and weight would be sufficient for these missions while also being more suitable for airborne applications..."

Serpentine Routing: Function over Form in PCB Routing

"san-francisco-circuits-serpentine-routing-function-over-form-pcb-routing-10-14-2020.htm" target="_top"> San Francisco Circuits' (SFC) specialty is in the complex, advanced technology of PCB fabrication and assembly, producing high quality multi-layered PCBs from elaborate layouts. Timing is everything, at least when it comes to signal integrity in a digital system. Analog says the prevailing wisdom is that shorter is better for using delay lines. On the digital side, numerous signals are kept in sync with a clock. Which one is right? Learn the answer and more about how Serpentine Routing is leading to increased performance in PCB routing in their new article "Serpentine Routing – Function Over Form in PCB Routing." San Francisco Circuits is a leader in PCB fabrication and PCB assembly making sure they are on the cutting-edge of developments in the PCB industry. From simple to complex PCBs...

The New Radio Receivers

Listen to the Podcast! World War II came to an end in Europe in May of 1945, and in the South Pacific in September of the year. By the end of 1944, Americans were becoming confident that their fathers, sons, and husbands would soon finally be home. Manufacturers began advertising the eminent return and availability of consumer products that had gone out of production due to material shortages during the war years. Advertisements ran in trade and hobby magazines as early as 1944 promising lines of goods that in many cases had not even been designed yet or production planned. Some products being promised, however, were merely models that were already in production before the attack on Pearl Harbor. A few publishers refused to accept such advertisements until there was more concrete evidence that victory was assured. In fact, Hugo Gernsback, editor and publisher of Radio-Craft magazine, wrote a scathing piece in early 1945 admonishing manufacturers for their overenthusiastic promise and promotion of consumer electronics prematurely...

ARRL 2020 Online Auction Begins October 15th

The 2020 ARRL Online Auction will be held October 15th-22nd. The preview began October 8th. "Don't miss this opportunity to get in on the fun and bid on a variety of items at the 15th annual ARRL Online Auction to benefit ARRL educational programs. We suggest you read through the 'Help' section, listing bidding tips as well as the link to our Help Desk should you need assistance. All bidders must register (your arrl.org user ID and password will not work on the auction site). If you have registered for a previous ARRL Online Auction, you may use the same log-in information..."

Many Thanks to Axiom Test Equipment for Continued Support!

Axiom Test Equipment allows you to rent or buy test equipment, repair test equipment, or sell or trade test equipment. They are committed to providing superior customer service and high quality electronic test equipment. Axiom offers customers several practical, efficient, and cost effective solutions for their projects' TE needs and is committed to providing superior customer service and high quality electronic test equipment. For anyone seeking a way to offload surplus or obsolete equipment, they offer a trade-in program or they will buy the equipment from you. Some vintage items are available fully calibrated. Please check out Axiom Test Equipment today!

Wednesday 13

20% Off RF Superstore Purchase

For a limited time, RF Superstore is offering 20% off your entire first purchase when you sign up to receive informational e-mails. You can unsubscribe at any time afterward. The launch of RF Superstore in 2017 marked the return of Murray Pasternack to the RF and microwave industry. As founder and CEO of Pasternack Enterprises from 1972 to 1992, Mr. Pasternack fundamentally changed the way RF components were sold throughout the industry. His signature catalog greatly simplified the ordering process and became the industry standard for RF component sales. Get better deals than ever on connectors and adapters, coaxial cable, antennas, waveguide, surge protectors and much more.

Holloway Electronics' "Expo" Antenna

Although I do not recall seeing a lot (none, actually) of antennas constructed in the style of this Holloway Electronics "Expo" model, I did a quick Web search to try finding contemporary products exploiting the concept. The "Expo" uses a set of exponentially curved elements to maintain a more constant separation distance between individual components in an effort to provide better gain across the entire VHF / UHF television broadcast bands. It seems like a really good idea on paper (no computers back in the day), but evidently in practice using an exponent of "1" (i.e., linear like all the rest) is good enough for acceptable reception. Any noticeable performance increase over standard antennas...

Regenerative Grid Simulators Support Real-World Testing

"Axiom-Test-Equipment-Regenerative-Grid-Simulators-Real-World-Testing-10-15-2020.htm" target="_top"> Axiom Test Equipment, an electronic test equipment rental and sales company has published a new blog post titled "Regenerative Grid Simulators Support Real-World Testing." Prior to reading the article, I had never given any though to how being connected to a power grid which is fed by a large number of independent solar panels, wind turbines, and hot air from politicians might affect the quality of electricity at my wall outlet. When multiple sources are combined onto a common line, inevitably there will be unique artifacts (noise spikes, harmonics, phase shifts, distortion, etc.) from each source that affects the supplied voltage and current waveforms, even with attempts to synchronize everything. Technically you are receiving a 60 Hz (or 50 Hz) alternating voltage source, but its makeup can be significantly different from an otherwise pure sinewave. This might thwart the efforts of Time Error Correction schemes implemented by electric utility grid operators to assure a long-term frequency stability...

After Class - Alternating Current Principles

Popular Electronics magazine wanted to be all things to all people - hobbyists, technicians, engineers, students, general public) as far as electronics goes. From the very first edition in October of 1954 (two prior to this one), they included articles on circuit troubleshooting, electrical theory, Amateur radio, DIY building projects, radio control systems for airplanes and boats, product reviews, and much more. The first issue's "After Class" column was "Series and Parallel Operation of Resistors" and the second issue was titled "Basics of Series and Parallel Circuitry." Over time, topics delved deeper into various components and circuit configurations, then started back again with the basics...

Promote Your Company on RF Cafe for as Little as $40/mo.

RF 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 13,000 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. If you need your company news to be seen, RF Cafe is the place to be. Advertising begins at $40/month.

The 3D Smith Chart: From Theory to Experimental Reality

The world was introduced publically in 2007 to the concept of a 3-dimensional Smith chart by Chris Zelley. In article published in IEEE Microwave Magazine entitled, "A Spherical Representation of the Smith Chart," the radically new concept was illustrated on the surface of a ping pong ball using a felt-tipped pen (thumbnail at left). Inspired by the sight, Andrei A. Muller and a small team of developers in 2013 created a version of the 3D Smith Chart in software using the Java language that allows it to execute on any platform. In 2017, an expanded functionality commercial version of 3D Smith Chart was released at a very modest price. A number of articles have been published on the topic extolling the unique ability of a 3-dimensional complex impedance volume to expose...

Many Thanks to Centric RF for Their Continued Support!

Centric RF is a company offering from stock various RF and Microwave coaxial components, including attenuators, adapters, cable assemblies, terminations, power dividers, and more. We believe in offering high performance parts from stock at a reasonable cost. Frequency ranges of 0-110 GHz at power levels from 0.5-500 watts are available off the shelf. Order today, ship today! Centric RF is currently looking for vendors to partner with them. Please visit Centric RF today.

Tuesday 12

Mac's Service Shop: Not Always Right

Listen to the podcast! Unless you have a tape player that you want to modify for plugging in external speakers, the most interesting part of this "Not Always Right" episode of Mac's Radio Service Shop will be how Mac handles a belligerent customer. As was the topic of many articles in the days when electronics repair shops could be found in every town, this joker accused Mac of liking to pad bills with time charged for using his expertise and expensive test equipment. He proved the old adage about the customer always being right usually did not apply to those who tried to tell the repairman how to do his job. Of course if the person could have done the repair himself, he probably would have. It reminds me of the signs that used to hang in auto repair shops that went something like this, "Repair rates: $30 per hour, $40 per hour with you watching, or $50 per hour with you helping."

White Paper: RF & Microwave Terminations

Res-Net Microwave has published a white paper entitled, "RF & Microwave Terminations," which reviews important considerations such as test setups and instrumentation and their use as terminations for RF couplers, isolators, and power combiners / dividers. Design and use issues like voltage standing wave ratio (VWSR), power dissipation, substrate type, temperature range, physical size and weight, package style, and how effects of parasitic capacitance and inductance limit high frequency operation are discussed. Input / output by means of screw-on coaxial connectors, and soldered flanges and surface mount tabs are also covered.

Keysight PathWave Software Suite Eliminates Limitations of Cloud Processing

"Keysight-Technologies-PathWave-Eliminate-Computational-Limitations-Cloud-Processing-10-13-2020.htm" target="_top"> Keysight Technologies announced it has expanded the company's "Keysight-Technologies-PathWave-Eliminate-Computational-Limitations-Cloud-Processing-10-13-2020.htm" target="_top"> PathWave Software Suite with new and enhanced capabilities. The new PathWave solutions enable engineers to remove computational limitations across the workflow, with cloud processing clusters, to improve designs and device reliability, while reducing project risk. Design and test engineers are struggling with complexity limitations that require weeks, if not months, of crunching data which can significantly slow the development process and market introduction. Keysight's PathWave, an open, scalable, and predictive software platform, offers fast and efficient data processing, sharing and analysis at every stage in the product development workflow. Combining design software, instrument control and application-specific test software, it enables engineers...

New Ink for Printing Electronics Inspired by Coffee Stains

"Researchers have developed a new family of inks that overcomes the 'coffee ring effect' to facilitate inexpensive fabrication of next-generation electronics such as sensors, light detectors, batteries, and solar cells. A team at the University of Cambridge spent years studying the physics of ink droplets, which dry in a spherical pattern that's easily observed by spilling coffee on a table and seeing the ring that forms on its surface. The team, led by Tawfique Hasan, a professor in the university's Cambridge Graphene Centre, combined particle tracking in high-speed micro-photography, fluid mechanics, and different combinations of solvents to create the new inks, which are comprised of a solution that mixes isopropyl alcohol and 2-butanol..."

Resistor Trial by Test

The cover of this month's Radio & Television News magazine is part of the issue's story on performance testing of resistors. The author was an engineer for International Resistance Company (IRC), which is still in business as part of TT Electronics. The massive ovens were used for load-life testing to certify resistor products for both military and commercial uses. When required, humidity enclosures subjected resistors to increased levels to test for insulation breakdown at high voltage. As the article observes, since a 10-cent resistor can take down a multi-thousand system, it is important to guarantee every component's integrity...

Many Thanks to MECA Electronics for Their Long-Time Support!

Since 1961, MECA Electronics has designed and manufactured an extensive line of RF & microwave components for in-building, satellite, radar, radio, telemetry, mobile radio, aviation & ATC. Attenuators, directional & hybrid couplers, isolators & circulators, power dividers & combiners, loads, DC blocks, bias-Ts and adapters & cables. MECA has long been the 'backbone' of high performance wired and air-interfaced networks such as in-building applications, satellite communications, radar, radio communications, telemetry applications, mobile radio, aviation & air traffic communications. 

Monday 11

Radio Dial Mechanism

Unless you are into restoring and/or repairing radios with dial cords, you probably can't fully appreciate the humor in this short piece from a 1953 issue of Radio-Electronics magazine. Dial cord is a type of string that does not stretch when put under tension. It is wound around the shafts of two or more components to keep them in step with each other. Since the advent of LED and LCD readouts for displaying the tuned frequency, there was no need to mechanically synchronize a sliding or rotating pointer with the position of a (usually) multi-plate tuning capacitor. If you are/were lucky, the path of the dial cord simply wrapped around the shaft of the tuning element (capacitor) and around the axle of a circular tuning dial, with no pulleys or bobbins for changing the direction...

Radiation-Immune and Repairable Chips to Fabricate Durable Electronics

"To operate safely and reliably in outdoor environments, electronic devices should be resistant to a wide variety of external factors, including radiation. In fact, high-energy radiation can damage several components of field-effect transistors (FETs) commonly used to make electronics, including their superconducting channel, gate oxide and the insulating materials surrounding it (e.g., isolation or substrate oxides). For several years, research teams worldwide have thus been trying to devise strategies that could make transistors more resistant to radiation. So far, however, this has proved to be highly challenging, and only a few of the techniques proposed in the past have achieved promising results. Researchers at Peking University, the Chinese Academy of Sciences and Shanghai Tech University have recently fabricated a radiation-hardened and repairable integrated circuit (IC) based on carbon nanotube transistors with ion gel gates. This IC, first presented in a paper..."

RIGOL DSG800 RF Signal Generators with I-Q Generation

"RIGOL-DSG800-IQ-Generation-RF-Signal-Generator-10-15-2019.htm" target="_top"> RIGOL Technologies announces another significant expansion of its RF Test Portfolio with the release of 4 new models of the "RIGOL-DSG800-IQ-Generation-RF-Signal-Generator-10-15-2019.htm" target="_top"> DSG800 Series RF Signal Generator. The explosion of IoT connected devices has led to a significant increase in the amount of digital data being transmitted via local RF interfaces. This expansion has driven a need for affordable IQ generation capabilities. RIGOL's new DSG800A models provide support for internal and external IQ generation allowing engineers to quickly generate IQ traffic to simulate or validate their designs. Available in 2.1 GHz and 3.6 GHz models with a starting price of only $3,699 the DSG800A provides the most capable and affordable IQ generation product on the market. Unlike some other manufacturer's value solutions, the DSG800A provides internal IQ modulation eliminating the need for an external IQ source...

Linear Array Beam Characteristics and Array Factor

Peter Delos, Bob Broughton, and Jon Kraft, of Analog Devices, have published the first of a multi-part article on phased array antenna patterns entitled, "Linear Array Beam Characteristics and Array Factor." As has always been the case with Analog Devices white papers, the is a good mix of equations, graphs, and explanatory text. It begins: "With the proliferation of digital phased arrays in commercial and aerospace and defense applications, there are many engineers working on various aspects of the design who have limited phased array antenna familiarity. Phased array antenna design is not new, as the theory has been well developed over decades; however, most of the literature is intended for antenna engineers well versed in the electromagnetic mathematics. As phased arrays begin to include more mixed signal and digital content..."

Radio on a Globe-Circling Dash

A century from now somebody will re-publish a story about the first human voyage to the planet Mars, and many of the folks reading it - or at least its headline - will deem such information obsolete and not worthy of his/her/its time reading. The same is true for many of these historical articles I post here on RF Cafe for the benefit of those people who appreciate the efforts and sacrifices of men and women who came before us to push back the frontiers of ignorance. Howard Hughes, whose name is familiar to fewer and fewer people these days, was a well-known and, increasingly throughout his life, eccentric millionaire. He made his money in, among other ventures, the aerospace industry. Hughes Aircraft is one of his eponymous companies. Not only was Mr. Hughes an accomplished aerospace engineer and aircraft designer, but he was an excellent pilot as well. This story from a 1938 edition of Radio-Craft magazine reports on his bid to be the first round-the-globe flight to be in constant contact with terra firma operators via radio communications...

Please Thank ConductRF for Supporting RF Cafe!

ConductRF is continually innovating and developing new and improved solutions for RF Interconnect needs. See the latest TESTeCON RF Test Cables for labs. ConductRF makes production and test coax cable assemblies for amplitude and phased matched VNA applications as well as standard & precision RF connectors. Over 1,000 solutions for low PIM in-building to choose from in the iBwave component library. They also provide custom coax solutions for applications where some standard just won't do. A partnership with Newark assures fast, reliable access. Please visit ConductRF today to see how they can help your project! 

Sunday 10

Wireless Technology Themed Crossword Puzzle for October 11th

October 11th's custom Wireless Technology themed crossword puzzle contains only only words from my custom-created lexicon related to engineering, science, mathematics, chemistry, physics, astronomy, etc. (1,000s of them). You will never find among the words names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort. You might, however, find someone or something in the otherwise excluded list directly related to this puzzle's technology theme, such as Hedy Lamarr or the Bikini Atoll, respectively. The technically inclined cruciverbalists amongst us will appreciate the effort.

Friday 9

Analyzing the R-C Circuit

Without presenting a single equation, author Cyrus Glickstein discusses the affects of resistor-capacitor interaction in circuits, aka R-C time constants. This 1953 Radio-Electronics article is directed mostly toward a repair technician poking and probing circuits while referring to schematics during troubleshooting sessions. Being in the age of vacuum tubes without integrated circuits with built-in biasing and interstage coupling circuits, there were plenty of discrete resistors, inductors, and capacitors strewn throughout the chassis with point-to-point wiring and components soldered directly to binding posts and terminal lugs on sockets, stacked wafer switches, transformers, etc. Cold solder joints and broken wires were a fairly common occurrence...

Post Your Engineer & Technician Job Openings on RF Cafe for Free

RF Cafe's raison d'être is and always has been to provide useful, quality content for engineers, technicians, engineering managers, students, and hobbyists. Part of that mission is offering to post applicable job openings. HR department employees and/or managers of hiring companies are welcome to submit opportunities for posting at no charge (of course a gratuity will be graciously accepted). 3rd party recruiters and temp agencies are not included so as to assure a high quality of listings. Please read through the easy procedure to benefit from RF Cafe's high quality visitors...

RIGOL 16-Bit Arbitrary Function Generator DG2000 Series

"RIGOL-16-Bit-Arbitrary-Function-Generator-DG2000-Series-11-5-2019.htm" target="_top"> RIGOL Technologies announces the new "RIGOL-16-Bit-Arbitrary-Function-Generator-DG2000-Series-11-5-2019.htm" target="_top"> DG2000 Series of Arbitrary Function Generators expanding their portfolio of 16 Bit Generators to satisfy the requirements of more rugged and industrial applications. The DG2000 delivers the same performance specifications and feature set as RIGOL's popular DG900 Series Generators. There are three DG2000 models ranging from 50 MHz to 100 MHz making it ideal for today's mainstream requirements. In addition to 16 Bit resolution the DG2000 includes all of the same advanced SiFi II capabilities as the DG900. Features like Dual Tone, Harmonics and Sequencing provide powerful generation capabilities...

$5.00 for Best Short Wave Kink

 If MacGyver had been around in 1935, every episode would likely have included a Fahnestock Clip as part of a scheme to get Angus (his first name - no kidding) out of perilous situations. The handy little devices were very popular in electronics, both for hobbyists and for commercial products, until fairly recently (within the last two decades) because they provide a simple, reliable electrical connection that does not require any tools for use - other than your finger. If you have never heard of a Fahnestock clip, you will probably be surprised to learn what it is and chances are you have seen one and maybe even used one. If you work in an electronics prototyping lab area that has been around for a while, there are almost certainly some in a parts bin somewhere or on some old...

RF & Electronics Symbols for Visio

With more than 1000 custom-built symbols, this has got to be the most comprehensive set of Visio Symbols available for RF, analog, and digital system and schematic drawings! Every object has been built to fit proportionally on the provided A-, B- and C-size drawing page templates (or can use your own). Symbols are provided for equipment racks and test equipment, system block diagrams, conceptual drawings, and schematics. Unlike previous versions, these are NOT Stencils, but instead are all contained on tabbed pages within a single Visio document. That puts everything in front of you in its full glory. Just copy and paste what you need on your drawing. The file format is XML so everything plays nicely with Visio 2013 and later...

Please Thank to Copper Mountain Technologies for Their Support

Copper 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.

Thursday 8

Hot & Cold Resistors as UHF Noise Sources

Whether you are new to the subject of noise figure or are just looking for a quick review, this "Hot and Cold Resistors as UHF Noise Sources" article in a 1976 issue of QST magazine is a good source. Author Benjamin Lowe, K4VOW, does a nice job of explaining the concept of electrical noise, and then presenting equations governing the calculation of noise factor and noise figure. Actual numerical examples are provided to demonstrate how the formulas work. Using this method, you can make a fair measurement of the noise figure of a receiver without the need for expensive test equipment.

Teledyne Paradise Wins PowerMAX SSPA System Contract Awards

"teledyne-paradise-wins-multiple-contracts-7-million-dollars-10-7-2020.htm" target="_top"> Teledyne Paradise Datacom, part of the Teledyne Defense Electronics Group, today announced recent contract awards totaling $7.4 million to provide numerous "teledyne-paradise-wins-multiple-contracts-7-million-dollars-10-7-2020.htm" target="_top"> PowerMAX SSPA (solid state power amplifier) systems over the course of the next two years. The largest single award of $5.9M calls for multiple PowerMAX SSPA systems to be deployed by the customer to support Telemetry, Tracking, and Control (TT&C) and broadband data transmission for satellite communications during an ongoing expansion of teleport facilities.   Teledyne Paradise Indoor PowerMAX SSPA System The PowerMAX systems from Paradise are a proven, mature platform for global satcom OEMs...

Electron Hole, Meet Your Fractional Cousin

"Researchers have designed a nano-electronic circuit that can tease into existence a strange new kind of quantum 'particle.' Its existence confirms decades of speculation about the behavior of electronic circuits in very low temperatures and high magnetic fields - and opens the door for possible applications in next-generation quantum computers. However, this quasiparticle carries only a fraction of an electron's charge. It is, to be clear, not substantively an actual single particle but rather more likely an ensemble of electrons acting collectively in certain extreme quantum environments..."

Army Studies Radio Wave Curvature

Early investigations into RF signal atmospheric "ducting" was reported in this 1956-era article in Popular Electronics. Ducting effects were first noticed during World War II when Nazi broadcasts from occupied Paris were received occasionally in London. Scientists discovered that a small change in the humidity of the air near the surface has the effect of trapping radio waves, a trapping process dubbed "ducting." These waves are conducted as if they were inside of a metallic waveguide. Research by the U.S. Army Signal Corps determined a sudden temperature rise at around 50 to 200 feet above the surface appears to have the strongest effect...

USECA October Newsletter Now Available

This October edition of "The USECA Express" monthly newsletter is undoubtedly one of the best club newsletters I have seen - and not just because it contains an RF Cafe Crossword Puzzle! Ken Coughlin, N8KC, editor of the publication, wrote to ask permission to use it. Event coverage - with lots of quality color photos, club and ARRL news, contact information, training course announcements, and a host of other good stuff is included in each edition. Note to others: I will be glad to provide a custom crossword for your club, school, business, that will use words relevant to your interests.

"Plug-In" RF Cable Assemblies for D38999 & VITA67

"ConductRF-Plug-in-RF-Cable-Assemblies-D38999-VITA67-10-7-2020.htm" target="_top"> ConductRF knows many times you want to just buy your RF assemblies to plug in to your circular D38999 connector or your VITA67 module. We offer multiple solutions for both styles of "ConductRF-Plug-in-RF-Cable-Assemblies-D38999-VITA67-10-7-2020.htm" target="_top"> multi-port connector all available on short lead times based on our on hand materials stock. D38999 integrates BMA, SMPM & SMPS connectors, also other #8, #12 & #16 coax contact solutions. VITA67.1/2 uses SMPM solutions, but the new VITA67.3 also offers SMPS and NanoRF to support your coax. These are 100% factory tested to exacting VSWR and loss standards because we know, Results Count!

Many Thanks to Atenlab for Their Continued Support!

Atenlab has been operating in Taiwan for more than a decade, and has sold and installed hundreds chambers around the world. Holistic, affordable 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.

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. Some quoted items have been shortened to save space. About RF Cafe.

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