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Homepage Archive - March 2022 (page 4)

See Page 1 | 2 | 3 | 4 | 5 of the March 2022 homepage archives.

Monday the 28th

Radio Circuit Page

Radio Circuit Page, January 1948 Radio News - RF CafeIn an effort to get as much service data as possible out to repair shops and do-it-yourselfers, the electronics magazines of yore often published clusters of just schematics and parts lists for radios, rather than publishing Radio Service Data Sheets, which were essentially Readers' Digest Condensed Versions of the kinds of service packages SAMS Photofact sold. Radio News, Radio & TV News, and Radio-Craft magazines put out most of the data. Most of the radio manufacturers would not even sell factory-prepared service data to anyone other than a licensed service dealer. Smaller electronics repair shops couldn't afford to buy all the service packs, and often relied on troubleshoot experience and the similarities of various models to get by without all the technical data. Usually that was good enough, until a particularly unique problem arose or a new line of products with new kinds of circuitry came out...

Many Thanks to ConductRF for Continued Support!

ConductRF coaxial cables & connectors - RF CafeConductRF 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! 

Charging Room System for Electricity over the Air

Charging Room System Provides Electricity over the Air - RF Cafe"Researchers have developed a system to safely deliver electricity over the air, potentially turning entire buildings into wireless charging zones. The technology can deliver 50 watts of power using magnetic fields. In addition to untethering phones and laptops, the technology could also power implanted medical devices. Heart implants, for example, require a wire that runs from the pump through the body to an external power supply. The new technology could eliminate that, reducing the risk of infection and improving patients' quality of life. The technology could also open new possibilities for mobile robotics in homes and manufacturing facilities..."

Carl and Jerry: Gold Is Where You Find It

Carl and Jerry: Gold Is Where You Find It, April 1956 Popular Electronics - RF CafeYou can buy a pretty good metal detector today for a hundred dollars that will find coins buried many inches deep and larger metallic items even deeper, and you even get discriminator functions to filter out unwanted objects like tin cans. They weigh just a couple pounds and can be used with one arm. Compare that to early metal detectors that had huge induction coils on a frame so heavy that shoulder straps were needed just to lug them around. Some models came on wheels for pushing or pulling like a cart. You could plan to spend a few hundred dollars (a thousand or more in today's dollars) for one. Even then, they were not as sophisticated as the $100 models sold by Amazon now. In classic fashion, teen electronics hobbyists Carl and Jerry use their technical prowess to design and build their own metal detector and then unintentionally using it to convince some old geezer that newfangled devices were not all useless fluff...

RCA Victor Model 102 Receiver Radio Service Data Sheet

RCA Victor Model 102 4-Tube A.C.-D.C. T.R.F. Receiver Radio Service Data Sheet, January 1935 Radio-Craft - RF CafeRadio Service Data Sheets were published by various electronics trade magazines (like this 1935 issue of Radio−Craft) back in the early to middle decades of the last century. SAMS Photofact document sets were published on just about every appliance made, and those had much more detail than these briefs. However, for the low-budget repair shop or the do-it-yourselfer, the Radio Service Data Sheets were a godsend. I have been scanning, cleaning up, and posting all the ones I find in my vintage electronics magazine collection. See a complete list at the bottom. Many fine examples of restored vintage radios can be found on the Internet, but I could not find one for this General Electric Model M-49. The two photos were provided by RF Cafe visitor Jeff B., of Beverly, Massachusetts. It appears to be in extremely nice condition for a 1930s era unit. These are now the only images of the M-49 anywhere I can find on the Internet. He is restoring the unit to working order...

RF Cascade Workbook

RF Cascade Workbook - RF Cafe RF Cascade Workbook 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 (click here for screen capture). 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...

Many Thanks to San Francisco Circuits for Continued Support!

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."

Sunday the 27th

RF Themed Crossword Puzzle for March 27th

RF Themed Crossword Puzzle for March 27th, 2022 - RF CafeHere is your custom made RF theme crossword puzzle for March 27th, 2022. R's and F's are prominent in this crossword. All RF Cafe crossword puzzles are custom made by me, Kirt Blattenberger, and have only words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

Thanks to Anritsu for Their Support!

Anritsu (electronics test equipment)Anritsu has been a global provider of innovative communications test and measurement solutions for more than 120 years. Anritsu manufactures a full line of innovative components and accessories for RF and Microwave Test and Measurement Equipment including attenuators & terminations; coaxial cables, connectors & adapters; o-scopes; power meters & sensors; signal generators; antenna, signal, spectrum, & vector network analyzers (VNAs); calibration kits; Bluetooth & WLAN testers; PIM testers; amplifiers; power dividers; antennas.

Friday the 25th

The Eye That Never Closes

Bell Telephone Laboratories - The Eye That Never Closes, November 1946 Radio-Craft - RF CafeHere is something you probably didn't know. I certainly didn't, but I'm not surprised. As with many advances in electronics and communications, Bell Telephone Laboratories invented the thermistor. According to this infomercial from a 1946 issue of Radio−Craft magazine, the thermistor was developed to adjust the amplification needed in its relay circuits to provide proper signal strength. It monitored the temperature of the output stage to determine the level. Bell claims the device was sensitive to within one millionth of a degree and could "see" the warmth of a man's body a quarter of a mile away on the battlefield (during World War II). As with most things, improvements have been continually in the thermistor in terms of temperature range, stability, accuracy, ruggedness, etc., all while lowering the price as mass production helps amortize production costs across huge volumes...

2021 Top 10 Fabless IC Companies

2021 Top 10 Fabless IC Companies - RF CafeTrend Force just released their list of the top 10 fabless IC companies in 2021 across the globe. Per the Electronics Weekly report: "Nvidia overtook Broadcom to take the second position behind No.1 Qualcomm. Taiwanese companies Novatek and Realtek rose to sixth and eighth place, respectively. Qualcomm had growth of 51% in phone chips snd 63% growth in IoT chips. Nvidia had growth of 64% in gaming graphics cards and 59% in data centre. Broadcom had growth of 18% from network chips, broadband communication chips, and storage and bridging chips. AMD's computer and graphics revenue grew by 45% YoY due to strong sales of the Ryzen CPU and Radeon GPU and rising ASPs. The annual revenue of AMD's enterprise, embedded, and semi-customized divisions increased by 113%, driving annual growth of total revenue to 68%..."

The Great Pickett Slide Rule Apollo Conundrum

The Great Pickett Slide Rule Apollo Conundrum - RF CafeLong after shirt pocket sized electronic calculators and glass cockpits became the norm for both professional and recreational aviators, Colonel J. Michael Gibson, a career pilot and navigator with the Canadian Civil Aeronautics Search and Rescue (now retired) carried a Pickett N600-ES slide rule in his flight jacket. Its diminutive size (only 5" long), sharply marked scales, and sturdy construction made it a favorite for on-the-go users. A special purpose Pickett N700-T USAF Aerial Photo slide rule lived in his flight suit sleeve pocket. Colonel Gibson is passing along his appreciation for the art of slide rule usage to his granddaughter. She routinely uses her Pickett 1010 model to calculate everything from volume and weight of water in her grandpa's swimming pool to the percentage of laps completed in a NASCAR race. I know what you're probably thinking; I had the same question. The answer is no, as far as he aware, our Colonel Gibson is not related to Captain Robert L. "Hoot" Gibson of NASA's Space Shuttle fame - although the two have met at the Reno Air Races. Speaking of air races, Captain Gibson, who piloted STS-41B (c1984) and commanded other flights, was suspended by NASA from flight duties for a year in 1990 due to a risky...

Transistor Made Using 2 Atomically Thin Materials

Transistor Made Using 2 Atomically Thin Materials - RF Cafe"The ever-shrinking features of transistors etched in silicon have always required pushing the cutting edge of manufacturing technology. The discovery of atomically thin materials like graphene and carbon nanotubes, however, raised the prospect of replacing our manufacturing needs with the natural properties of these materials. There's no need to etch a 1 nm feature into silicon if you could simply use a carbon nanotube that's 1 nm wide. And there have been some notable successes, such as a 1 nm gate made of a single carbon nanotube. But the work often involves a difficult process of getting the atomically thin materials in the right place to create a functional device. And the rest of the hardware is typically made of bulkier materials that are borrowed from more traditional transistor design. A new paper released this week, however, describes a record-setting design that has the smallest transistor gate length yet reported. The record was set by the edge of a graphene sheet, meaning the gate is only a single carbon atom across..."

Sangamo Electric Company Ad

Sangamo Electric Company Ad, September 1949 Radio & Television News - RF CafeThis advertisement from a 1949 issue of Radio & Television News would never pass muster with the politically correct crowd of today! Even though, as with the Washington Redskins football team, Red Man chewing tobacco, Indian Motorcycles, Land O'Lakes food company, American Indians are without exception used as a depiction of strength, high quality, high integrity, and beauty, there is a very, very, very tiny minority of rabble rousers who are having their way with the vast, vast, vast majority (there seems to be a lot of that these days). Somehow that has become the norm in society today. If the goal is to upset everyone and to pit good people against each other, then it has been a resounding success. For the record, I reject the idiocy and buck their efforts whenever possible...

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...

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. Blog posts offer advice on application and use of a wide range of test equipment. Please visit Allied Test Equipment today to see how they can help your project.

Thursday the 24th

Electronics Themed Comics - 1940 Radio News

Electronics Themed Comics, November 1940 Radio News - RF CafeIt's about time for another bunch of technical-themed comics from my vintage electronics magazines. These four are from a 1946 issue of Radio News. With many of them (these and others - see huge list of links at the bottom), you might need to have a little insight into the radio communications consumer and military markets of the era to fully appreciate the humor, but with most you can infer the meaning even if you don't know the specifics. Some themes still apply today, like the influence of your body adding capacitance to the tuning circuit of a radio to the extent that a station comes in loud and clear while your fingers are on the dial or while you are near the radio, then fades once you move away. It then becomes a challenge to detune a bit to one side or the other, then move away and see if the station comes in clear. If not, you detune in the other direction and see if that works. Sometimes, the only solution is to situate yourself near the radio to get a good signal. 30 minutes later, everything can change and you go through the ritual all over again. Integrated circuit tuners...

Anatech Electronics Intros 3 Filter Models for Mid March

Anatech Electronics Intros 3 Filter Models for Mid March 2022 - RF CafeAnatech Electronics offers the industry's largest portfolio of high-performance standard and customized RF and microwave filters and filter-related products for military, commercial, aerospace and defense, and industrial applications up to 40 GHz. Three new filter models have been introduced - a connectorized cavity bandpass filter that has a passband from 8,000 to 11,000 MHz, 1 dB insertion loss and minimum 18 dB return loss; a surface mount ceramic bandpass filter with a bandwidth of 300 MHz and an insertion loss of 2.5 dB max; and a connectorized dual band cavity bandpass filter with a lower band passband of 454.66 to 454.98 MHz and an upper band passband of 459.66 to 459.98 MHz. Custom RF power directional coupler designs can be designed and produced when a standard cannot be found, or the requirements are such that a custom approach is necessary...

Coming in September "Popular Electronics"

Coming in September "Popular Electronics," August 1954 Radio & Television News - RF CafeBefore seeing this announcement for the impending premier issue of Popular Electronics magazine, I thought the October 1954 issue was the first to be published. According to this August 1954 Radio & Television News magazine feature, Popular Electronics was to debut in September 1954, not October. The teaser cover photo showed a family at a picnic table with more radio equipment than food - including a big spring-loaded 1/4-wave whip antenna mounted to the trunk of their car. It was never used for any issue from what I can find, nor did the article entitled, "WABD's Empire State Building Television Transmitter." A bit of research shows that the planned September 1954 issue never was. In fact, editor Oliver Read's first column, entitled, "Meet Popular Electronics," confirmed my finding. He wrote in part, "POPULAR ELECTRONICS is the answer to the demand for a monthly publication devoted entirely to electronics at a practical and hobby level..."

CETECOM Dual Capability OTA Test Chamber for 5G

CETECOM Expedites 5G Approvals with Dual Capability OTA Test Chamber for FR1 and FR2 Frequencies - RF CafeCETECOM, a global company providing telecom test and certification services, announces the availability of Over-The-Air (OTA) testing for FR1 and FR2 frequency bands together, in a new EMITE HE300 test chamber recently commissioned at the company's Silicon Valley location. This chamber is uniquely capable of testing from 600 MHz to 7.25 GHz in FR1, and 24.25 to 40 GHz in FR2 or mmWave frequencies, and is the first of its kind to be installed in a test and certification lab in the USA. The chamber has carrier approval for 5G NR certification services. It provides measurements of antenna gain, efficiency, directivity, polarization and beam characteristics for frequencies from 0.6 to 110 GHz, and can support 5G frequencies below 7.125 GHz and mmWave (24 to 40 GHz) standardized testing in accordance with 3GPP TR38.810, TR37.842 and TR38.521 specifications. Due to carriers' plans to expand FR1 testing, CETECOM is actively increasing its capacity to support the latest technologies, specifically VoNR (Voice over New Radio). This increases CETECOM's overall OTA test capacity for FR1 and FR2...

Oscillators - How They Work

Oscillators - How They Work, December 1940/January 1941 National Radio News - RF CafeNational Radio Institute (NRI) was founded in 1914 at the dawn of the radio age. It provided self-study courses as well as classroom instruction on the art of electronics and radio communications. A bi-monthly magazine entitled National Radio News was published by them from 1929-1953. This article explaining how oscillators work appeared in the December 1940 edition. Although circuits of the day used vacuum tubes, the principle of voltage and phase relationships required to initiate and sustain oscillations are the same as for transistor circuits. A step-by-step description is provided from the time the power is applied until stable oscillations are established. More is known nowadays regarding actions at the atomic level regarding how oscillations begin, but the fundamental principles are the same...

RF & Electronics Stencils for Visio

RF & Electronics stencils for Visio r4 - RF CafeWith more than 1000 custom-built stencils, this has got to be the most comprehensive set of Visio Stencils available for RF, analog, and digital system and schematic drawings! Every stencil symbol has been built to fit proportionally on the included A-, B-, and C-size drawing page templates (or use your own page if preferred). Components are provided for system block diagrams, conceptual drawings, schematics, test equipment, racks (EIA 19", ETSI 21"), and more. Test equipment and racks are built at a 1:1 scale so that measurements can be made directly using Visio built-in dimensioning objects. Page templates are provided with a preset scale (changeable) for a good presentation that can incorporate all provided symbols...

Please Thank RF Superstore for Their Continued Support

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!

Wednesday the 23rd

Anti-Collision Cars

Anti-Collision Cars, April 1952 Radio-Electronics - RF CafeExperiments with self-driving cars has been going on since the 1920s according to the Wikipedia entry, with real trials beginning in the 1950s. This editorial entitled "Anti-Collision Cars," by Hugo Gernsback, appeared in a 1952 of his Radio-Electronics magazine. He points to his editorial in a 1935 issue addressing the same subject. Self-driving is of course different from anti-collision, but some of the same sensor and guidance system principles are common to both concepts. Mr. Gernsback's scheme involves not just detection of a potential collision scenario, but also a system that can automatically attempt to guide the car to a safe condition. Many new cars have some form of sensing system to alert the driver to the presence of nearby obstacles. I picked up a 2021 Hyundia Elantra rental car- not a high-end model - a couple days ago (a dope backed into our 2011 Jeep Patriot), and even it has areas in the side view mirrors that illuminate when a car approaches closely. It also has a rear view backup camera and other proximity detectors. All those bells and whistles are nice, but the dude who hit me had all that and more in his high end Chevy Silverado 3500 HD truck when he accelerated at an unbelievable rate out of a parking spot in a large parking lot and smashed into the Patriot's left front fender. He even admitted to both me and the cop that he never even looked...

San Francisco Circuits PCB School

San Francisco Circuits PCB School - RF CafeSan Francisco Circuits (SFC) has for a while been posting a series of short lessons in its "PCB School" feature, highlighting PCB fabrication and assembly for high-tech industries. Topics include "PCB Dimensional & Thermal Stability," "How Do You Manage Copper Pads, Copper Traces, & Planes in High-Load Applications?, "Serpentine Routing–Function over Form in PCB Routing," "The Past, Present, & Future of Microelectronics & PCB Production," "PCB Layout: Basics, Optimizations & Effectiveness," "The Importance of PCB Trace Widths in PCB Design" and many more...

Magnetostriction Devices and Mechanical Filters for RF

Magnetostriction Devices and Mechanical Filters for Radio Frequencies, June 1953 QST - RF CafeIf you have ever heard the audible hum emitted by a power supply transformer, then you are familiar with at least one of the manifestations of magnetostrictive materials. I thought maybe shape memory metals ("muscle wire") would be considered magnetostrictive, but research shows they are classified separately because their shape change is attributed primarily to heating rather than magnetization. I also thought the old 'reeds' type receive decoders for pre-1960s-era radio control systems might be magnetostrictive devices, but no search turned up anything where the term was used. This article and its two succeeding articles discuss magnetostrictive filters at kilohertz IF frequencies. Part I covers the fundamentals of magnetostrictivity while Part II gets into building realizable bandpass filters. Unfortunately, I do not have the August 1953 edition of QST for Part III. The referenced article in the September, 1950, issue of the RCA Review...

R&S Delivers Fully Integrated Communications to RAN

Rohde & Schwarz Raises the Bar on Delivery of Fully Integrated Communications to RAN - RF CafeWith the formal handover today of the vessel ADV Cape Otway to the Royal Australian Navy (RAN), Managing Director Rohde & Schwarz Australia Gareth Evans congratulated both Austal and the Rohde & Schwarz team for exceptional performance in delivery of the company's Naval Integrated Communications System (NAVICS). "It's a great day for Austal and Navy, but also for Rohde & Schwarz Australia, which as Communication Systems Integrator (CSI) has achieved a number of record milestones that have significantly contributed to this day becoming a reality," Mr. Evans said. "Within just five months of contract execution we completed the design of our customized NAVICS internal and external communications solution for the Cape class..."

Approxi-Meter... for When Close Is Good Enough

Approxi-Meter... for When Close Is Good Enough, July 1958 Flying Models - Airplanes and RocketsHere is an example of just how far we have come in the realm of electronics. In a world where you can go to Harbor Freight and buy a digital multimeter with an accuracy of 1% or better for a mere $3, this article from the July 1958 edition of Flying Models illustrates the dedication that was necessary in order to outfit yourself with even the most fundamental tools for flying radio control airplanes. It was part of an era where building your own electronic device was less expensive than buying one prefabricated. Such was the case for the aircraft radios, too, as evidenced by the number of advertisements in magazines of the day for kits. As is often true, there are good and bad aspects of building versus buying. Building gives you the intricate knowledge of how everything goes together and functions along with actually using the stuff you build. However, the ability to buy your equipment pre-built leaves more time for honing flying skills...

RF Cascade Workbook

RF Cascade Workbook - RF Cafe RF Cascade Workbook 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 (click here for screen capture). 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...

Please Thank RF Superstore for Their Continued Support

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!

   

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. About RF Cafe.

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Copyright: 1996 - 2024

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    Kirt Blattenberger,

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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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