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"The difference between intelligence and stupidity, is that intelligence has its limits." - Anon

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

• FCC Seeks to Mitigate Orbital Debris

Canada's 5G Stalls in Face of Wuhan Virus Pandemic

• Deutsche Telekom, Ciena Launch 1st 800G Network in Europe

• Music Organizations Take Aim at Big Radio Companies

New Tesla Battery Poised to Reshape Auto Economics

 • Facebook Investing $1B to Build Subsea Cable to Africa

• Trump's Trade Ban on Huawei Extended to May 2021

Radio Amateurs' Ventilator Design Goes to FDA

• China Opposed to Latest U.S. Rules Against Huawei

Radio & Science Crossword Puzzle for May 24

Radio & Science Crossword Puzzle May 24, 2020 - RF CafeBeginning in the year 2000 and running through today, May 24, 2020, I have been creating weekly custom technology-themed crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. A database of thousands of words has been built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, familiar company names etc. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you.

Electronics-Themed Comics from Vintage "Radio & Television News" Magazines

Electronics-Themed Comics, November 1944 Radio News, October 1949 & June 1951 Radio & Television News - RF CafeHere are three more technology-themed comics from vintage of Radio & Television New magazines. Some issued had multiple comics, but these three had just one apiece, so I combined them onto a single page. There is a huge list of previously posted comics at the bottom of the page. With many of these comics, you might need to be familiar with the mindset of the electronics world back in the day. Today it considered hilarious today to see a video of someone walking into a street lamp pole while staring obliviously into a smartphone. In the middle of the last century, fun was made of wives not understanding their hubbies' hobbies, dealings with servicemen, and and goofy things do-it-yourselfers of the era were doing.

Get Your Custom-Designed RF Cafe Gear!

Custom-Designed RF-Themed Cups, T-Shirts, Mouse Pads, Clocks (Cafe Press) - RF CafeThis assortment of custom-designed themes by RF Cafe includes T-Shirts, Mouse Pads, Clocks, Tote Bags, Coffee Mugs and Steins, Purses, Sweatshirts, and Baseball Caps. Choose from amazingly clever "We Are the World's Matchmakers" Smith chart design or the "Engineer's Troubleshooting Flow Chart." My "Matchmaker's" design has been ripped off by other people and used on their products, so please be sure to purchase only official RF Cafe gear. My markup is only a paltry 50¢ per item - Cafe Press gets the rest of your purchase price. These would make excellent gifts for husbands, wives, kids, significant others, and for handing out at company events or as rewards for excellent service. It's a great way to help support RF Cafe. Thanks...

Acoustic Waves in Microchips for Faster Signal Processing

Acoustic Waves in Microchips for Faster Signal Processing - RF Cafe"According to researchers from the University of Sydney Nano Institute and Max Planck Institute for the Science of Light, chips that use light and sound, rather than electricity, will be important for the development of future tech, such as high-speed internet as well as radar and sensor technology. This will require the low-heat, fast transmission of information. Scientists in Australia and Europe have taken an important step towards removing 'hot' electrons from the data chips that are a driving force in global telecommunications. Microchips without electrons will allow for the invention of data processing systems that don't overheat, have low energy costs, and reduce greenhouse gas emissions. This foundational work will help scientists invent systems to achieve those aims..."

Under a Telephone Pole

Under a Telephone Pole, by Carl Sandburg - RF Cafe"There is no new thing under the sun." - Ecclesiastes 1:9. "Everything old is new again." - Peter Allen in All That Jazz. Many such idioms exist regarding how often things tend to run in cycles; it's just that often times people who think they are witnessing a new phenomenon are not aware of the previous occurrences. I have written of examples where 'old timers' lament the attitudes of a fledgling work force when writings show the previous generation of 'old timers' who worked with the current 'old timers' in their youth expressed the same type concern. Experienced Ham operators think newbies cannot carry on the tradition of wireless because they are not required to learn Morse code anymore to earn a license.

Windfreak Technologies: USB-Powered RF Synthesizers, Mixers

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

The Saga of the Vacuum Tube

The Saga of the Vacuum Tube, November 1944 Radio News - RF CafeHere is Part 14 of a series entitled "The Saga of the Vacuum Tube," by Gerald Tyne, that appeared in Radio News magazine in 1944. Part 1 was printed in March 1943, and Part 22, the final chapter, was published in April 1946. It could have been a stand-alone book. If I manage to be able to buy issues with some of the other parts, those will be posted as well. You might be aware of the origins of the amplifying vacuum tubes, beginning with the accomplishments of Dr. de Forest and his Audion. As with most new technologies, progress moved very rapidly once other researchers glommed on to the concept. Here, Mr. Tyne discusses the development of the "Kenotron," "Pliotron," "Dynatron," and "Magnetron," by Drs. Langmuir, Dushman and Hull of the General Electric Laboratories, during the years 1913 to 1921.

Quantum Radar Uses Entangled Microwave Photon

Quantum Radar Uses Entangled Microwave Photons - RF Cafe"A quantum radar using entangled microwave photons has been created at the Institute of Science and Technology Austria. Also known as 'microwave quantum illumination,' the demonstration detected objects in a noisy thermal environment - and there are potential applications for it in low-power biomedical imaging and security scanners, according to the Institute. 'What we have demonstrated is a proof of concept for microwave quantum radar,' said researcher Shabir Barzanjeh. 'Using entanglement generated at a few thousandths of a degree above absolute zero, we have been able to detect low-reflectivity objects at room-temperature.' Instead of using conventional microwaves, the researchers entangle two groups of photons - 'signal' and 'idler' photons..."

Quasi-Optical Short Waves Electron Oscillations

Quasi-Optical Short Waves Electron Oscillations, February March 1932 Short Wave Craft - RF CafeIn 2015 we would hardly think of electromagnetic radiation in the 5 cm wavelength realm as being 'quasi-optical' as far as circuit-based manipulation is concerned. Optical wavelengths begin at around 6,300 Å for red light, which is 6.3x10-5 cm, or 630 nm. The 5 cm wavelength used an example in a 1932 article in Short Wave Craft magazine is equivalent to 6 GHz. 6 GHz was an extraordinarily high frequency to be using for communications back then, and the author did not intend to liken it to anywhere near visible light. Instead, his terming its properties as 'quasi-optical' referred to how the waves interacted with physical objects; e.g., reflection, refraction, absorption, and scattering. Barkhausen oscillations were a popular subject of the era, as I pointed out recently in the article "The Spook - Another Weird Effect to Haunt TV..."

Many Thanks for Alliance Test Equipment's Support!

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

Triad RF Systems Helps SpyLite Go the Distance

Triad RF Systems Helps SpyLite Go the Distance - RF CafeTriad RF Systems, a leading designer and manufacturer of integrated radio systems and high performance RF/Microwave amplifiers, is positioned to assist in the deployment of Bluebird Aero Systems' SpyLite® Mini-UAS (there's a cool animated video on BAS's homepage). Designed and manufactured by Bluebird Aero Systems, SpyLite® is a mature, advanced, combat- proven, extended performance electric Mini-UAS, optimized to provide covert, "over-the-hill" or extended range real-time visual intelligence. SpyLite is unique in its ability to fly even in severe weather, assuring high operational availability for 3-4 hours and a communication range of over 50 km (can be extended up to 80 km). Fully autonomous, the system delivers autonomous ease of use and high reliability, providing a very versatile and stable ISR platform...

San Francisco Circuits: PCB Fabrications & Assembly Service

San Francisco CircuitsSF Circuits' specialty is in the complex, advanced technology of PCB fabrication and assembly, producing high quality multi-layered PCBs from elaborate layouts. With them, you receive unparalleled technical expertise at competitive prices as well as the most progressive solutions available. Their customers request PCB production that is outside the capabilities of normal circuit board providers. Please take a moment to visit San Francisco Circuits today. "Printed Circuit Fabrication & Assembly with No Limit on Technology or Quantity."

Mac's Radio Service Shop: Telephone Pickups and Other Subjects

Mac's Radio Service Shop: Telephone Pickups and Other Subjects, April 1954 Radio & Televsion News - RF CafeAt least in the U.S., laws regarding the recording of telephone conversations seem to be constantly changing and vary from state to state. Violation penalties - including imprisonment - can be severe in both cases. Some states require that all parties in the conversation be apprised of the recording, while others only require that at least one party (obviously the one doing the recording) be aware of it. As mentioned in this 1954 "Macs Radio Service Shop" story, some areas require that an audible "beep" be sounded at regular intervals while recording is occurring. With the ubiquitous use of smartphones featuring built-in recording capabilities, opportunities for recording and being recorded are constant. Cave participantium, to coin a phrase. As with carrying concealed weapons or just transporting them between states, if you have any intention of recording a telephone conversation, you had best check on the most recent statutes before-hand.

On-Chip Optical Frequency Combs Generate Photonic Microwaves

On-Chip Optical Frequency Combs Generate Photonic Microwaves - RF Cafe"Engineers from EPFL have successfully demonstrated a laser-based microwave generator using integrated photonic chips. This new technology could have a plethora of useful applications, and may one day be used in 5G wireless networks, radars, and satellite communications. In order to achieve this feat, scientists had to dramatically lower the optical losses of the photonic waveguides. These waveguides are based on silicon nitride, which was manufactured with the lowest loss in any photonic integrated circuit. With the help of this technology, engineers created coherent soliton pulses with repetition rates in the X-band and the microwave K-band..."

ConductRF Performance TSA89 Flexible RF Test Cables to 40 GHz

ConductRF Performance TSA89 Flexible RF Test Cables to 40 GHz - RF CafeManufacturing of all our products continues to operate at full capacity as part of the "Essential Business" community. Professional high frequency TSA89 series of RF test cables with performance to 40 GHz. Precision connector choices include; SMA, Type-N, 3.5mm, 2.92mm, & 2.4mm. Key features: High-frequency point to point cable, light weight rugged double-shielded, flexible cable, low loss <0.68 dB/ft @ 40 GHz, low VSWR < 1.35:1 (Typical < 1.25:1), RF leakage >−100 dB to 18 GHz, temperature rated from -55ºC to 125ºC. 100% factory VSWR and insertion loss tested. Cables are in stock and available immediately from Digi−Key. Made in the USA.

Electro-Voice Microphones Advertisement

Electro-Voice Microphones Advertisement, February 1943 QST - RF CafeHere is an advertisement for Electro-Voice Manufacturing Company microphones that I scanned from page 101 of my copy of the February 1943 QST magazine. As with many companies during the World War II era, this one's theme is the service their products are providing to America's servicemen. Per the ad: If you were receiving radio messages from men in the midst of ear­splitting battle noises, you'd hear crisp speech undistorted by background sound effects. Electro-Voice Microphones, in military service, are helping to make it possible. Similar microphones, designed to achieve such results, will be available for specific commercial applications ... after our wartime job is done...

Withwave Intros New Line of 1.85 & 2.92 mm Right Angle Adapters

Withwave Intros New Line of 1.85 & 2.92 mm Right Angle Adaptors - RF CafeWithwave's new line of 1.85 and 2.92 mm Right Angle Adapters are designed based on precision microwave interconnection technologies. These 1.85 mm & 2.92 mm / 2.92 mm to 2.92 mm types are manufactured to precise microwave specifications and constructed with male and female gender on both side. The precision microwave connector interfaces ensure an excellent microwave performance up to 40 GHz. Features include: Frequency range of DC to 40 GHz, VSWR of 1.20:1 (max) @40 GHz, and the body is made of passivated stainless steel...

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 $25. We're leading the way again!

The Taylor "Super-Modulation" Principle (part 2)

The Taylor Super-Modulation Principle, October 1948 Radio & Television News - RF CafeRobert Taylor, along with inventing the concept of "super-modulation," also coined the new communications term "Intelligence Transmission Efficiency." It refers in part to the ratio of power in the intended sideband relative to power in the at least partially suppressed other sideband and carrier. Admittedly, I have not read this material enough to fully comprehend the concept of super-modulation, but at least based on the Fig. 1 waveform, there seems to be an element that adds a DC bias to the detected signal due to a nonsymmetrical (about 0 Vdc) transmitter modulation by pumping more power into the positive peaks. I'm happy to be corrected by any knowledgeable reader. For that matter, if you have experience with super-modulation and care to share it with RF Cafe visitors, I'll be glad to post your comments...

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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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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