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"At that time, space was empty..." - Dr. Heiner Klinkrad on space junk, relative to 1957 with Sputnik 1

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

Wi-Fi 6: Understanding the Consumer and Enterprise Opportunities

• Lockheed Martin Launches 1st Smart Satellite for Space Mesh Networking

GDP Growth vs. IC Growth

• C-Band Alliance Emphasizes Speed, Compensation in Preparing for 5G

• Record-Breaking Terahertz Laser Beam

Barry Shelley, N1VXY, to Become ARRL Interim CEO

• How Huawei Could Affect U.S.-Ally Relationships

• Bluetooth SIG Announces the Next Gen Bluetooth Audio

• GM Will Revive Hummer as an Electric Off-Roader

Popular Electronics Editorial - The 1972 IEEE Show

Editorial IEEE Show, Popular Electronics, July 1972 - RF CafeBefore there was the annual International Microwave Symposium (IMS) trade show, the Institute of Electrical and Electronics Engineers' (IEEE) Microwave Theory and Techniques Society (MTT-S) hosted the show, which was widely known as the MTT-S show. Before that, the event went by a variety of names, including "Intercon," (International Convention and Exposition) as reported in this 1972 issue of Popular Electronics magazine. For the first few decades since its inception in the 1950s, New York City was the venue, often in a hotel. As with tides and solar cycles, enthusiasm and attendance waned and ebbed over the years. 1972 was one of the low years. Per the story, about half the number of people were there compared to two years prior. I could not locate a chart of attendance numbers over the years, nor the numbers to generate my own chart...

Many Thanks to Anatech Electronics for Long-Time Support!

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. 

The Lincoln Vocational Technical Center - A Partial Autobio

The Lincoln Vocational Technical Center, Annapolis, Maryland, Kirt's Cogitations #317 - RF CafeOne day in late spring of 1973 I found myself walking around the gymnasium of Annapolis Junior High School (AJHS) trying to decide which courses I would prefer upon beginning tenth grade the following fall. It was one of the final days of ninth grade, which had been by far my least happy year in school. Living in Mayo, Maryland, I and my fellow neighborhood ninth graders should have attended Southern Senior High School (SSHS) in Harwood, Maryland, where our predecessors had gone for ninth grade, but overcrowding caused the Anne Arundel School Board wizards to decide that for at least that year, we would remain at AJHS for another term. Historically, kids from my area went to AJHS only for seventh and eighth grades and then switched to SSHS. Annapolis, being the capital city of Maryland, was significantly more urban than the rural areas to which SSHS type people were accustomed. The clientele was much more aggressive in the big city. Sure, we had our "red neck greaser" rowdies in the southern part of the county, but at least their parents would whip them if they got caught getting into trouble...

III-V and III-N Devices on Si Target 100 GHz FEMs

III-V and III-N Devices on Si Target 100 GHz FEMs - RF Cafe"Researchers at Imec have demonstrated what they believe to be the first functional GaAs-based heterojunction bipolar transistor (HBT) devices on 300 mm Si, and CMOS-compatible GaN-based devices on 200 mm Si for mm-wave applications, showing cut off frequencies in the 40/50 GHz region. In wireless communication, with 5G as the next generation, there is a push towards higher operating frequencies, moving from the congested sub-6GHz bands towards mm-wave bands (and beyond). The introduction of these mm-wave bands has a significant impact on the overall 5G network infrastructure and the mobile devices. For mobile services and Fixed Wireless Access (FWA), this translates into increasingly complex front-end modules..."

Video: Automatic Calibration Module Confidence Check

Copper Mountain Technologies Video: Automatic Calibration Module Confidence Check - RF CafeCopper Mountain Technologies (CMT) has produced a series of videos to help users of its diverse line of vector network analyzers (VNAs) get the most out of their extensive capabilities. Proprietary features in both hardware and software supplies VNAs designed by CMT with capabilities far beyond similar equipment by other companies. This video entitled, "Automatic Calibration Module Confidence Check," is one of a series of videos that can be found on the Copper Mountain Technologies website. "How many times have you completed a series of measurements to find them tainted by a bad cable...

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. 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...

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!"

Mac's Radio Service Shop: Was Ist Los?

Mac's Radio Service Shop: Was Ist Los?, May 1958 Radio News - RF CafeImagine reading an article from a 1958 magazine that references the schematic for a specific radio manufactured in Germany, and then being able to download a copy of it for free on the Internet. Such is the case with this Mac's Radio Service Shop story entitled, "Was Ist Los?" Mac is describing to his sidekick Barney the difficulty in troubleshooting and repairing a Metz Transformatoren: Babyphon 56 that a serviceman had purchased while stationed overseas. The diagram is of course in German, which requires Mac to pull out a language translation dictionary. The problem was that many words unique to technical jargon were not in it. Additionally, units of measure for the capacitors and inductors were not like U.S. units. Mac noted that many capacitor values were labeled with units of "u," "n," and "p," for "micro," nano," and "pico." He mentions the "micro" prefix for the letter "u," but never calls the "n" and "p" by the now-standard terms...

Hazel TV Episode "Stop Rockin' Our Reception"

Hazel TV Episode "Stop Rockin' Our Reception" - RF Cafe Video for EngineersQST reader George P. Orphan, KG4DXJ, wrote in the February 2020 issue's "Letters from Our Members" column about an episode of the old "Hazel" television show entitled, "Stop Rockin' Our Reception," where interference on the Baxters' TV set was blamed on the "shortwave set" operated by a teenager, Bruce, who had recently moved in down the street. George Baxter, the household's impulsive lawyer father, was convinced enough that Bruce, a friend of his son, Harold, was responsible that he paid a visit to the boy's house and spoke to his father about it. Bruce politely informs Mr. B that unless his television was was manufactured before 1950, it was unlikely that his operations on the 10−meter band would be causing the interference, but it fell on deaf ears. Shortly thereafter, a power company investigator was seen walking around the front yard with a box bearing a loop antenna on the top of it. At the request of Bruce's father...

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...

Many Thanks to Nova Microwave for Continuing Support!

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. 

Mathematical Model Predicts Knot's Stability

Mathematical Model Predicts Knot's Stability - RF Cafe"In sailing, rock climbing, construction, and any activity requiring the securing of ropes, certain knots are known to be stronger than others. Any seasoned sailor knows, for instance, that one type of knot will secure a sheet to a headsail, while another is better for hitching a boat to a piling. But what exactly makes one knot more stable than another has not been well-understood, until now. MIT mathematicians and engineers have developed a mathematical model that predicts how stable a knot is, based on several key properties, including the number of crossings involved and the direction in which the rope segments twist as the knot is pulled tight. 'These subtle differences between knots critically determine whether a knot is strong or not,' says Jörn Dunkel, associate professor of mathematics at MIT..."

One SDR Software Defined Radio Resources

One SDR Software Defined Radio Resources - RF CafeSam wrote from his One SDR website to request I post a note about the resources he is providing on Software Defined Radios. It is in its start-up phase and already has many articles introducing the concepts of SDR. Topics include low noise amplifiers, filters, bias tees, and how to shop for equipment. Says Sam, "I hope to demystify RF technology and make it more accessible to the growing community of SDR enthusiasts." The amateur radio community is adopting SDR in a major way in order to make existence in the crowded electromagnetic environment more successful.

RF Superstore: Supplier of RF & Microwave Components

RF Superstore coaxial cable, connectors, adapters - RF CafeRF Superstore launched in 2017, marking the return of Murray Pasternack, founder of Pasternack Enterprises, to the RF and microwave Industry. Pasternack fundamentally changed the way RF components were sold. Partner Jason Wright manages day-to-day operations, while working closely with Mr. Pasternack to develop RF Superstore into a world class RF and microwave component supplier. RF coaxial connectors & adapters, coaxial cable & cable assemblies, surge protectors, attenuators. Items added daily. Free shipping on orders over $99. We're leading the way again!

Decoding Numbers Stations

Decoding Numbers Stations, QST November 2019 - RF CafeIf you are a radio guy (or gal) who likes international sleuthing, mystery, and intrigue, then you will probably want to read an article entitled, "Decoding Numbers Stations," from the November 2019 issue of the ARRL's QST magazine. Author Allison McLellan, who is interested in communications history but apparently not a Ham herself, writes, "Scanning through the bands on AM, you stumble upon something odd. It might be the last few notes of a folk song, a sound clip from an old cartoon, or phrases in a different language. A voice cuts through the static, methodically calling out, 'Mike, India, Whiskey, One, Four...' But this isn't a fellow ham announcing their call sign. These are numbers stations, an eerie subset of radio stations that has intrigued hams and non-hams alike for decades. Numbers stations are shortwave AM radio stations that transmit messages via voice or Morse code, believed to be coded in one-time pad (OTP) cryptography. In OTPs, the message is comprised of strings of numbers..."

Howard W. Sams & Co. Ad

Howard W. Sams & Co. Ad, March 1958 Radio News - RF CafeI'm guessing most RF Cafe visitors who are more than 50 years old are familiar with, and even have seen, the Sams Photofacts packages of documentation for consumer electronics appliances that include televisions, radios, phonographs, clock-radios, tape recorders/player, amplifiers, etc. Most electronics service shops couldn't have existed with them since many manufacturers did not distribute technical and service data to anyone who was not a certified, sanctioned dealer. Howard Sams, the company's founder, did the equivalent for electronics of what Chilton did for cars and trucks. They basically reverse engineered models bought off a showroom floor. This advertisement from a 1958 issue of Radio & TV News magazine features the man himself, Howard Sams, so now you'll recognize him if you pass him on the street...

Norway Experiences Unexpected Ground Current "Shockwave"

Norway Experiences Unexpected Ground Current "Shockwave" - RF cafeThis excerpt from SpaceWeather.com reads like the plot from an episode of Star Trek: "Earth may have crossed through a fold in the heliospheric current sheet, described as 'a giant, wavy membrane of electrical current rippling through the solar system'." It comes from a story on the ARRL news webpage entitled, "Norway Experiences Unexpected Ground Current 'Shockwave'." On January 6, "unexpected electrical currents were detected in the soil of northern Norway starting at around 1930 UTC. 'It seemed to be some kind of shockwave,' said Rob Stammes, who monitors ground currents at the Polarlightcenter geophysical observatory in Lofoten. 'My instruments detected a sudden, strong variation in both ground currents and our local magnetic field. It really was a surprise'..."

An SWR-Shifting "T"

An SWR-Shifting "T", QST February 2020 - RF CafeThe American Radio Relay League (ARRL) includes a free online sample article from their monthly QST magazine - definitely a good policy to help sell the publication (and membership in the ARRL). The February 2020 edition offers "An SWR-Shifting 'T'," written by Mr. Bill Conwell, K2PO. It includes some useful Smith chart techniques. "Any feed-line mismatch can be brought to a 1:1 SWR with a single shunt capacitor, provided its value and the location where it bridges the coaxial center and shield conductors is chosen correctly. This is because there are two locations at every half-wave along a mismatched feed line where the impedance is exactly 50 Ω in parallel with a reactive component. By extending or shortening the coax so that one of these locations is at the transmitter-end of the coax, a counter-reactive shunt component can be applied using a coaxial T connector..."

Particle Accelerator in a Silicon Chip

Particle Accelerator in a Silicon Chip - RF Cafe"Researchers in the U.S. are designing a silicon chip that can accelerate electrons to over 94% of the speed of light. The team at Stanford University and the SLAC particle accelerator, backed by the Gordon and Betty Moore Foundation set up by one of the founders of Intel, and the European Union's Horizon 2020 Research and Innovation Programme, used infrared lasers and a nanoscale silicon channel to build the accelerator. The infrared pulses are synchrnised to boost the energy of the electrons. Details of the prototype accelerator-on-a-chip were published in today's issue of Science. The key is the design and fabrication techniques can be scaled up to deliver particle beams..."

Windfreak Technologies withwave microwave devices - RF Cafe
Res-Net Microwave - RF Cafe vidaRF Isolators & Circulators - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
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 ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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