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"A physicist who professed such ideas was unworthy to teach science." - German Minister of Education on Georg Ohm's Law

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

Subsea Cable Linking Chile to Australia Snubs Chinese Connection

• USAF Experimental Navigation Satellite Cleared for Fabrication

• Amazon Gets FCC Approval for Project Kuiper Satellite Constellation

Semiconductor Rebound Around the Next Corner?

Micro/Mini-LED Revenue to Reach $4.2B in 2024

Nokia, Ericsson, Huawei Dominance Fading

• T-Mobile Claims World's 1st for 5G Standalone Deployment

• Wuhan Virus Blamed for 15.7% YoY Smartphone Shipments Decline

• White House Partnership to Boost Quantum Science Education

QSO Today Virtual Ham Expo August 8th & 9th

QSO Today Virtual Ham Expo - RF CafeParticipate in this ground breaking, virtual international amateur radio expo. Packed with world renowned speakers, exhibitors, and special conference rooms built on a virtual reality platform. Attend from the convenience of your desktop, laptop, tablet, or smartphone. QSO Today Virtual Ham Expo coming to your laptop, tablet, and smartphone on: August 8th and 9th (that's this weekend). QSO Today called on its former guests and other expert amateur radio operators to create an amazing series of lectures in webinar format from one of our five virtual lecture halls. All lectures are: Fully live interactive with speaker during the session hour, Completely downloadable after the weekend, Collateral materials are downloadable in PDF format, Everything available up to 30 days.

Loops vs. Dipole - Analysis and Discussion

Loops vs. Dipole - Analysis and Discussion, August 1976 QST - RF CafeComputer analysis in 1976 was a job performed on a corporate, university, or government mainframe. Radio Shack's TRS-80 came out in 1977, but it did not have the capacity to calculate and plot antenna gain charts like the one in this QST article. Yes, an ambitious programmer could write the code necessary to perform the double integrals presented in the article, but to do all the figuring needed to create all the graphs in Figure 4, the job would just about be finishing up today - and that's not too much of an exaggeration. For some reason the authors never mention what computer was used or where it was based. When I saw the title of "Loops vs. Dipole," I expected the loop to be round or square, but for analysis purposes it was modeled as a pair of parallel elements representing the horizontal components of a square loop antenna. Justification for omission of the vertical sides...

The 1st Time-Zone-Delayed TV Broadcasts

The 1st Time-Zone-Delayed TV Broadcasts - RF CafeMr. Chris B., a colleague of mine at Comsat, in Germantown, MD, way back in the early 1990s, was/is a big fan of vintage audio and video gear and test equipment. In fact, he worked at a sideline business repairing vacuum tube equipment. Chris was also a semi-rigid coax cable bending and routing master if memory servers me. He visits RF Cafe on a regular basis because of the article post from last-century electronics magazines. Anyway, he sent me a link to a story about the first documented use of magnetic tape (Ampex quad videotape) in 1956 for time-delaying east coast broadcasts to equivalent time slots on the left coast. Prior to that, kinescopes were used to relay broadcasts live so the 6:00 pm and 11:00 pm east coast news broadcasts from ABC, CBS, and NBC were shown at 3:00 and 8:00, respectively, in LA and Seattle. Prime time shows ran from 5:00 - 8:00 pm Pacific time, which was very inconvenient to the locals' schedules. Here is a 1958 Radio-Electronics article entitled, "4-Track Stereo Tapes Coming."

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

MECA ElectronicsSince 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. 

Drones Transforming How Telcos Inspect Towers

Drones Transforming How Telcos Inspect Towers - RF Cafe"Drone technology offers a powerful way for enterprises to conduct remote asset inspections during and after the Covid-19 pandemic. The demand for drones among enterprises is forecast to continue to grow over the next few years, with Gartner predicting that shipments of enterprise drones will reach 1.3 million by 2023. Telcos and MNOs are already leveraging drone technology to automate cell tower inspections, boost operational efficiency, and accelerate the rollout of 5G infrastructure. As connectivity improves and automation increases, we can expect to see drones at the edge, completing autonomous missions, and uploading data directly to the cloud, bringing substantial business benefit to telcos and other enterprises..."

San Francisco Circuits Publishes the Importance of PCB Trace Widths in PCB Design

San Francisco Circuits Publishes the Importance of PCB Trace Widths in PCB Design - RF CafeSan Francisco Circuits (SFC) shares in a recently published article entitled, "The Importance of PCB Trace Widths in PCB Design," that there are a variety of applications that demand specific trace layout characteristics and how or when to incorporate them into PCB designs. A specific PCB application will determine trace widths and trace types in a PCB design and a balance should be maintained between PCB fabrication cost, board density/size, and performance. The purpose of a PCB trace is to connect any kind of electrical signal - analog, digital, or power - from one junction to another. And if a PCB has specific design requirements such as speed optimization, noise or coupling mitigation, or high current/voltage, the trace widths and types might be more important than optimizing for manufacturing cost of the bare PCB or overall board size...

Les Paul: Technician and Musician

Les Paul: Technician and Musician, October 1958 Radio-Electronics - RF CafeIf I told you that Lester William Polsfuss is widely credited with being a major player in the pioneering of electric guitars due to his solid-body (no acoustic resonance chamber) designs, you might wonder where I came up with that claim. However, if you know that Mr. Polsfuss is the surname of Les Paul, then you would quickly agree. As if being a popular musician and, along with wife Mary Ford, selling millions of records wasn't enough, Les Paul was also an experimenter and inventor in the electronic music realm. This article entitled "Les Paul: Technician and Musician" appeared in a 1958 article in Radio-Electronics magazine, and was at the time a contemporary look inside his home-workshop-studio, when he was first gaining popularity...

Many Thanks to ISOTEC for Continued Support!

ISOTEC Corporation - RF CafeSince 1996, ISOTEC has designed, developed and manufactured an extensive line of RF/microwave connectors, between-series adapters, RF components and filters for wireless service providers including non-magnetic connectors for quantum computing and MRI equipments etc. ISOTEC's product line includes low-PIM RF connectors components such as power dividers and directional couplers. Off-the-shelf and customized products up to 40 GHz and our low-PIM products can meet -160 dBc with 2 tones and 20 W test. Quick prototyping, advanced in-house testing and high-performance. Designs that are cost effective practical and repeatable.

Urgent Need !!!

Cree CMPA0060025F - RF CafeAn engineer friend wrote saying he is in immediate need of 50 pieces of the Cree CMPA0060025F, 25 W, 20-6000 MHz, GaN MMIC power amplifier. If you can supply any quantity, please contact me at kirtrfc@aol.com to let me know. Time is of the essence. Thank you very much!

The Incredible Ovshinsky Affair

The Incredible Ovshinsky Affair, September 1969 Electronics Illustrated - RF CafeEven with having been granted more than 400 patents in his lifetime, and being a major player in the realms of energy, data storage, and semiconductor research and manufacturing, you - as well as most people - have probably never heard the name Stanford Ovshinsky. He was somewhat of a celebrity in the 1960s and 1970s when working hard to promote his concept of "glassy semiconductors," - aka Ovonic devices. Ovonics are amorphous materials that are used for making switches for digital logic and memory devices. Either the Ovshinsky process did not pan out for high volume commercial production or some other technology displaced the what it was hoped to dominate...

FCC Fines HobbyKing ~$3M for Unauthorized Drone Transmitters

FCC Fines HobbyKing ~$3M for Unauthorized Drone Transmitters - RF Cafe"The FCC has issued a Forfeiture Order (FO) calling for HobbyKing to pay a fine of $2,861,128 for marketing drone transmitters that do not comply with FCC rules. An FCC Enforcement Bureau investigation stemmed in part from a 2017 ARRL complaint that HobbyKing was selling drone transmitters that operated on amateur and non-amateur frequencies, in some instances marketing them as amateur radio equipment. The fine affirms the monetary penalty sought in a June 2018 FCC Notice of Apparent Liability (NAL). The FCC said its investigation found that dozens of devices marketed by the company transmitted in unauthorized radio frequency bands and, in some cases, operated at excessive power levels. 'Such unlawful transmissions could interfere with key government and public safety services, like aviation systems,' the FCC said.'We have fully considered HobbyKing's response to the NAL, which does not contest any facts..."

Electricity in Motion: Current

Electricity in Motion: Current, Basic Navy Training Courses, NAVPERS 10622, Chapter 3 - RF CafeOne of the Notable Tech Quotes which has appeared on RF Cafe is, "The nice thing about standards is that you have so many to choose from," by computer scientist Andrew Tanenbaum. In the middle of the last century, a change in the fundamental understanding of current flow precipitated what has become a very large opportunity for people to misunderstand descriptions of current direction caused by a difference in voltage potential (voltage) - depending on the era a particular description was written. Beginning with Benjamin Franklin, electron current flow was assumed to be from positive to negative, ostensibly but incorrectly, because a positive thing must contain an excess of something (charge carriers - electrons) and a negative thing must have a deficiency. Hence, current flowed from an excess source to a deficient sink. We now know that negative things contain more electrons (relatively) than a positive...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. Chances are you have never used a spreadsheet quite like this. It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features...

Overcome Stray Magnetic Fields with Active Field Compensation

Overcome Stray Magnetic Fields with Active Field Compensation - RF Cafe"As the EV market grows, so does demand for robust magnetic field sensors within these vehicles. Stray magnetic fields may diminish the accuracy of these sensors, though, which is where active stray-field compensation comes to the rescue." So begins Frederik Berstecher in his article entitled, Overcome Stray Magnetic Fields with Active Stray-Field Compensation, posted on the Electronic Design website. Continuing, "The electric-vehicle market continues on a serious upswing: Allied Market Research forecasts show it will reach $802.81B by 2027, up from $162.34B in 2019 [can they really estimate to 5 significant digits? - KRB]. Such growth also pushes the need for additional magnetic field sensors within these vehicles for position detection. The sensors are robust enough to withstand a variety of harsh environmental conditions, temperatures, vibrations..."

Withwave Intros Precision SMPM Adapter Series DC to 67 GHz

Withwave Intros Precision SMPM Adapter Series DC to 67 GHz - RF CafeWithwave has announced a new precision SMPM Adapter Series for DC to 67 GHz. These SMPM Series are designed based on precision microwave interconnection technologies up to 67 GHz. These SMPM(F) to SMPM(F) with bullet type and SMPM(M) to SMPM(M) are manufactured to precise microwave specifications and constructed with female and male gender on both sides. The precision microwave connector interfaces ensure an excellent microwave performance up to 67 GHz...

Many Thanks to Berkeley Nucleonics for Continued Support!

Berkeley Nucleonics Corp - RF CafeBerkeley Nucleonics Corporation (BNC) is a leading manufacturer of precision electronic instrumentation for test, measurement, and nuclear research. Founded in 1963, BNC initially developed custom pulse generators. We became known for meeting the most stringent requirements for high precision and stability, and for producing instruments of unsurpassed reliability and performance. We continue to maintain a leadership position as a developer of custom pulse, signal, light, and function generators. Our designs incorporate the latest innovations in software and hardware engineering, surface mount production, and automated testing procedures.

Radio-Electronics Monthly Review

Radio-Electronics Monthly Review, September 1947 Radio-Craft - RF CafeThe "Monthly Review" column appearing in Radio-Craft magazine was an assorted collection of news tidbits about electronics and communications industry happenings, similar to contemporary magazines. Looking back to 1947, the world was hopeful about the future as World War II was finally over and even the loser countries were focusing on how their societies would be shaped by technology and lessons learned in the preceding seven to ten years (depending on when a country entered the war). Two items here are particularly interesting because they refer to ongoing research into large screen televisions and video phones (aka "televisers"). Large screens at the time meant either much bigger cathode ray tubes (CRTs) or projection systems - both of which came to fruition in the 1960s and 1980s, respectively. Plasma screens, then LCD and finally LED screens mark the eventual evolution...

pSemi Expands High-Performance Digital Step Attenuator Portfolio

pSemi Expands Portfolio with Two High-Performance Digital Step Attenuators - RF CafepSemi® Corporation, a Murata company focused on semiconductor integration, announces the expansion of its digital step attenuator (DSA) portfolio with two new high-performance DSAs, PE43610 and PE43614. Featuring industry-leading attenuation accuracy, the PE43610 and PE43614 DSAs support the entire 9 kHz-13 GHz and 9 kHz–45 frequency ranges, respectively. Ideal for 5G test-and-measurement applications, these DSAs exemplify pSemi's high-performance capabilities at mmWave frequencies, maintain monotonic response across the entire frequency range and feature high linearity and fast switching time. Offered in a 24-lead 4x4 mm LGA package, the pSemi PE43610 and PE43614 DSAs feature industry-leading attenuation accuracy, fast switching times, wider frequency...

Thanks Again for Windfreak Technologies' Continued Support!

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.

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

Engineering Job Board - RF CafeRF 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. 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...

IMS 2009 RF/Microwave Museum Photos

IMS 2009 RF/Microwave Museum Photos (Historical Booth) - RF CafeSince the International Microwave Symposium (IMS 2020) is completely virtual this year, I figured maybe re-posting my coverage of the Microwave Museum display of vintage industry research and development items would fit right in. The photos were taken during my attendance at IMS 2009 in Boston, MA. At the time, they were the only photos of the collection on the WWW. It had a very nice display of items from the early days of radio and radar. According to the IMS 2009 website, the items are "memorabilia from the first IMS held in Boston 50 years ago." Most displays were glass cases, so it made getting useful photographs difficult because of glare and reflections. You will see some of that in the images here. More information can be found on the National Electronics Museum website...

Southwest Antennas Dual-Band Sector Antennas for Multi-Band MIMO and MANET

Southwest Antennas Dual-Band Sector Antennas for Multi-Band MIMO and MANET Communication Networks - RF CafeSouthwest Antennas, a leader in rugged RF and microwave antenna products and accessories for tactical radio systems, is pleased to announce the release of four new dual-band sector antennas designed for use with multi-port MIMO and MANET radio networks. The innovative dual-band sector antenna design allow these antennas to operate across two distinct frequency bands, enabling dual-band transmit and receive capabilities when paired with radio systems capable of multi-band operation. Dual-band operation allows for many advanced network configurations and features, including rapid band-switching for anti-jamming applications in contested RF environments, separating network traffic by band based on environmental operating conditions...

Qorvo / Custom MMIC Distributed Amplifier Design - RF Cafe ConductRF Precision RF Test Cables - RF Cafe
Res-Net Microwave - RF Cafe Res-Net Microwave - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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