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Homepage Archive - February 2022 (page 4)

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

Monday the 28th

Employment in the Computer Field

Employment in the Computer Field, September 1957 Radio & TV News - RF CafeGaining a design engineering position with Google is (or at least was) notoriously difficult because of some of the tests that are administered - depending on the hoped-for job. Skills in logic, creativity, problem solving, and fundamental mathematics and science are among the capabilities that must be demonstrated. IBM was known to have tough entry requirements for customer field service representatives back in the early days of computers - for technicians as well as for engineers. "A man who can think his way through a problem can learn electronics, but a person lacking in analytic abilities will never be a good service engineer," said an employment manager. Successful candidates could expect to earn $400/month or more. That was in 1957 dollars, which is $4,041 (~$48k/year) in 2021 dollars (per BLS inflation calculator) - not too awful. Field-experienced, well-qualified service engineers earned $500 to $750 per month ($5.1k to $7.6k per month, or $61k to $91k per year)...

Capacitor Theory and Application

Capacitor Theory and Application - RF Cafe After being in the electronics field for decades, it is sometimes tempting to think that the world has enough magazine articles and books covering introductory lessons on the fundamentals of capacitors, inductors, semiconductors, circuit analysis, testing, etc. While that may be true, there is value in have a fresh approach to the subjects that include discussions on modern materials and methods. An article published in 1989 might have had a computer output plot of impedance vs. frequency on a 16-color, 320x200-pixel CGA monitor that plotted data points with "x" and "o" characters. This article by Min Zhang entitled "Capacitors: Theory and Application," is a good intro for newcomers. It begins: "Capacitors are among the most commonly used components on a circuit board. With the ever-increasing number of electronics devices (from mobile phones to cars), there has been a growing demand for capacitors...

Empower RF Patents PA System w/Internal Optical Comms Link

Empower RF Systems Patents Power Amplifier System w/Internal Optical Communication Link - RF CafeEmpower RF Systems is proud to announce the issuance of a new patent entitled "Power Amplifier System with an Internal Optical Communication Link." Techniques for implementing an internal optical communication link in a power amplifier system are disclosed. In one embodiment, the techniques may be realized as a power amplifier system that includes a panel, an optical link, and a controller. The panel includes a plurality of signal endpoints and a first optical interface, the first optical interface being coupled to each of the plurality of signal endpoints. The optical link is coupled to the first optical interface. The controller is configured to manage operation of the power amplifier system and is coupled to the optical link via a second optical interface. The controller communicates with each of the plurality of signal endpoints over the optical link...

Bliley Electric Company Advertisement

Bliley Electric Company Advertisement, April 1945 Radio News - RF CafeBliley Electric Company is one of the relatively few companies that advertised regularly in electronics magazines during the World War II era that is still in business today - at least under the same name (Bliley Technologies now, but still the same base name). While the company is no longer located in the Union Station Building anymore, it does still live in Erie, Pennsylvania, only a mile or so from where I Melanie and I last lived there (2021). They still make crystals today, albeit with different materials and different methods. In fact, there is a short Bliley company history video on their website, and also this video from a local TV station showing of the internal workings at Bliley...

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...

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.

Sunday the 27th

Ham Radio Theme Crossword Puzzle for February 27th

Ham Radio Theme Crossword Puzzle for February 27th, 2022 - RF CafeThis custom Ham Radio themed Crossword Puzzle for February 27th, 2022, is brought to you by RF Cafe. 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 Radio Month - Microstrip Introduced

The Radio Month - Microstrip Introduced, January 1954 Radio-Electronics - RF CafeFor many years, Radio−Electronics magazine ran a monthly feature entitled "The Radio Month," which contained news of industry events, personnel hirings and promotions, product introductions, inventions, etc. This January 1954 issue introduced something called "microstrip" to the world. Unlike a lot of new concepts billed as breakthrough, paradigm changing discoveries that you never hear about again, this one caught on. Practically every wireless device on the market today has a microstrip substrate of some sort. It was developed by a division of IT&T called the Federal Telecommunication Laboratories. Also in the news was a thimble size transistor 100x as powerful as present commercially available types. Made by Minneapolis Honeywell Regulator Company, it had a whopping 20-watt output (no mention of operational frequency)...

Intrinsic Superconducting Diode Effect

Intrinsic Superconducting Diode Effect - RF Cafe"In 2020, Professor Teruo Ono and his colleagues at Kyoto University reported the very first observation of a magnetically controllable, superconducting diode effect in an artificial superlattice. Their findings, published in Nature, paved the way for other studies aimed at moving towards the fabrication of non-dissipative electronic circuits. Working in collaboration with Professor Ono, another research team at Kyoto University in Japan recently carried out a study aimed at better understanding the mechanisms underlying the interesting effect observed two years ago. Their paper, published in Physical Review Letters, hypothesizes the existence of an intrinsic mechanism that could underpin the superconducting diode effect reported in their previous work. 'Our group works in collaboration with Prof. Ono, whose research group performed the pioneering experiment of the bulk superconducting diode effect,' Akito Daido, one of the researchers..."

Electronic Realism in Disneyland

Electronic Realism in Disneyland, April 1956 Popular Electronics - RF CafeDisneyland opened its gates in Anaheim, California on July 17, 1955. It was billed as the most high-tech theme park in the world, with a 'wow' factor on par with the World's Fair extravaganzas. One of its much-ballyhooed features was the "realistic" jungle safari tour with life-like animal automatons and authentic 3-D jungle sounds. This 1956 Popular Electronics magazine article, published less than a year after opening day, highlights some of the equipment and methods used by artists and engineers to achieve the effects. Of course the equipment and methods used today make this effort seem less than amateurish...

Anatech Electronics February 2022 Product Announcement

Anatech Electronics February 2022 Product Announcement - 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 100 MHz LC lowpass filter with SMA connectors, a 450-470 MHZ LC bandpass filter with N connectors, and a surface mount 2575 / 2680 MHz ceramic duplexer filter. 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...

"L" Networks for Reactive Loads

"L" Networks for Reactive Loads, September 1966 QST - RF Cafe"L" networks are probably the most common types of impedance matching networks not just for antennas, but for an relatively narrowband load. Determining the required values for the network is relatively simple using well-established equations. Knowing how to use a Smith Chart makes the job even easier. This article from a 1966 edition of QST magazine presents the equation approach. If you have access to the May 2013 edition of QST, there is a complimentary article on L networks that uses the free Smith Chart cross-platform Java software called SimSmith. If you want to do a little complex number math, try the 1966 approach...

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."

Thursday the 24th

Hams May Not Use Radio Equipment to Commit Criminal Acts

CC: Amateur Service Licensees May Not Use Radio Equipment to Commit Criminal Acts - RF CafeHere's a prime example of your government hard at work: "FCC: Amateur Service Licensees May Not Use Radio Equipment to Commit Criminal Acts." That's right, if you are one of those Hams who thought it was OK to use your radio in the committing of a crime, ignorance of the law is no longer an excuse. At first I thought this was yet another example of bureaucratic inanity. However, upon further consideration, this could just be a precursory "shot across the bow" to anyone who might engage in conversation disapproving of government dictates. If you think that might be crazy thinking, consider how our neighbors to the north recently arrested Freedom Convoy organizer Tamara Lich on charges of "counseling to commit mischief." You have been warned.

Transmission Line Lead-In for U.H.F.

Transmission Line Lead-In for U.H.F., January 1954 Radio-Electronics - RF CafeThis statement by Bruce Richards is an absolute truism, especially regarding ultimate system performance: "Transmission line lead-in is a necessary evil. The service technician should not regard it lightly. The best antenna and the best receiver in the country may not give satisfactory reception unless serious attention is paid to the connection between them." Gauging from some of the reader-submitted questions over the years to QST magazine columnists, a lot of people do not fully understand and/or appreciate the significant role the transmission line between the antenna and transmitter/receiver plays. Much more concern is expressed over loss of power out during transmission, but few seem to consider how the received signal is impacted due to resistive and/or mismatch losses in the transmission line. The minimum discernable signal (MDS) is directly affected, dB for dB, by line loss, so minimizing loss is extremely important when you need to receive weak signals...

Many Thanks to Triad RF for Their Continued Support!

Triad RF SystemsTriad RF Systems designs and manufactures RF power amplifiers and systems. Triad RF Systems comprises three partners (hence 'Triad') with over 40 years of accumulated knowledge of what is required to design, manufacture, market, sell and service RF/Microwave amplifiers and amplifier systems. PA, LNA, bi-directional, and frequency translating amplifiers are available, in formats including tower mount, benchtop, rack mount, and chassis mount. "We view Triad more as a technology partner than a vendor for our line-of-sight communications product line." Please check to see how they can help your project.

Turnstiles of Single Electrons Possible New Power Standard

Turnstiles of Single Electrons Posible New Power Standard - RF Cafe"Researchers at Aalto University propose method of transducing frequency to power. The world's most commonly used system of measurement, the International System of Units (SI), was redefined in 2019. Since then, units have needed to be defined in terms of the constants of Nature - that is, Nature's rules that are fixed and of no uncertainty, such as the speed of light - and not in terms of arbitrary references. This has meant that new research for relating the many units of the system to the constants through experimental realizations has been called for. 'The redefinition has caused a need for new realizations,' says Professor Jukka Pekola. Researchers at Aalto University have now found a promising new way to link the watt (the unit of power) to the constants of Nature. They believe their method could show the way towards a new power standard, that is, a new way to produce an a priori known amount of power against which other power sources and detectors can be compared..."

RCA Victor Model M-70 2-Unit Auto-Radio

RCA Victor Model M-70 2-Unit Auto-Radio (Chassis No. RC-394) Radio Service Data Sheet, August 1939 Radio-Craft - RF CafeThis Radio Service Data Sheet is from the series published by Radio-Craft magazine in the 1920s and 1930s. The "2-Unit" part of the title indicated, per the schematic, that the power supply and the speaker output drivers were in a separate chassis that would have been mounted in the trunk or under a seat. I could not find an example of an actual RCA Model M-70 auto radio, but the thumbnail image to the left from information on the RadioMuseum.org website at least gives an idea as to its appearance. I am posting them for the benefit of people who restore those vintage models to working order. It is still possible to buy Sam's Photofacts packages that include schematics and alignment data, but these info sheets fill the gap for ones either not available, or for someone needing to get a feeling for what he/she is up against before making a full commitment to the task...

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

Sponsor RF Cafe for as Little as $40 per Month - RF CafeNew Scheme rotates all Banners in all locations on the page! RF Cafe typically receives 8,000-15,000 website visits each weekday. RF Cafe is a favorite of engineers, technicians, hobbyists, and students all over the world. With more than 12,000 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. If you need your company news to be seen, RF Cafe is the place to be.

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.

Wednesday the 23rd

Westinghouse Micarta Duo Tabletop Radio-Phonograph

Westinghouse Micarta Duo Tabletop Radio-Phonograph, June 1948 Radio News - RF CafeMicarta was a relatively significant synthetic material when George Westinghouse invented it sometime around 1910. It was a composite of phenolic resins mixed with structural components like paper, wool, cotton, linen, and others which would facilitate molding into simple and complex shapes. Although even the wooden cabinets manufactured at the time were often very curvaceous and decorative, the process was expensive compared to molding in forms. Micarta has the advantage of being hard and rigid for good structural integrity, but since the color permeated the part, scratched and dings did not show as readily. Its high resistivity made it a good insulator so use in high voltage assemblies and for circuit boards was common. Look at just about any electronic or electrical product dating before about 1950 and you will almost surely find Micarta (or a variation of it) somewhere in or on it...

Small UAV Satcom System

Small UAV Satcom System - RF Cafe"A Honeywell breakthrough in compact satellite communications technology will bring the safety, connectivity and efficiency trusted for decades by airplane manufacturers and airlines to three of Pipistrel's new aircraft, including the fixed-wing Surveyor and both unmanned Nuuva platforms, the V300 and smaller V20. Weighing in at only 2.2 pounds, Honeywell's Small UAV SATCOM system is 90% lighter than the company's next smallest connectivity system, yet it brings the same capabilities enjoyed by larger aircraft to the Nuuva V300, V20 and Surveyor. This is the first time Honeywell's new system will be implemented specifically on an unmanned cargo or optionally manned aerial vehicle and is expected to unlock global beyond-visual-line-of-sight (BVLOS) connectivity..."

Hoffman Model A301 Schematic & Parts List

Hoffman Model A301 Schematic & Parts List, August 1947 Radio News - RF CafeHere are the schematics & parts lists for the Hoffman model A301 tabletop radio. It was published in the August 1947 issue of Radio News magazine. I typically run OCR on them to separate the textual content and include part of that to help the search engines find it. However, this one did not have any textual description. There are still many people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. The thumbnail to the left is a pretty nice example of a Hoffman model A301 tabletop radio currently listed on eBay. I keep a running list of all data sheets...

ConductRF TEA80 TESTeCON Cables for DC-18 GHz

ConductRF TEA80 TESTeCON Cables for DC to 18 GHz, 2/23/2022 - RF CafeConductRF offers many lines of Lab & Production RF Test solutions for DC to 18 GHz. TEA80 series TESTeCON and TESTeLINK coaxial cable product lines feature standard connector choices include straight male, female, and bulkhead, and right angle male. Standard interfaces include type-N, TNC, SMA, 3.5 mm, and 2.92 mm. Phase stable testing ±4° to 18 GHz, amplitude stable to ±0.2 dB to 18 GHz, max power 170 W @ 18 GHz, flex life over 10,000 cycles, cable loss <0.330 dB/ft @ 18 GHz, VSWR <1.30:1 (typical < 1.20:1). These cables can be purchased directly from Digi-Key...

Eastern Amplifier Corporation Ad

Eastern Amplifier Corporation Advertisement, April 1945 Radio News - RF CafeEastern Amplifier's history is well hidden on the Web. The best clue I could find regarding their history is from this interview on Ralph Baer who says Eastern Amplifier Company became Loral. (see p13. The title of "It's Spring... and the Plants Are Booming!" was a double entendre playing off the drawing of a mother and her daughter standing in a field, but actually referring to the industrial war machine cranking out weapons and supplies for our troops "Over There." It reminds me of an older radio host who would remark that he could remember "the bees buzzing" as heard from his back yard on Long Island. He was alluding to the 'B-' series bombers taking off and landing from Mitchel Field near his home. Note: Amazingly, the grandson of Eastern Amplifier company founder Leonard Meyerson, Matt Meyerson, saw this page and wrote the following...

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...

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!

Tuesday the 22nd

Electronics-Themed Comics - July 1940 Radio News

Electronics-Themed Comics, July 1940 Radio News - RF CafeHere are a few more electronics-themed comics from a 1940 issue of Radio News magazine. You can probably tell from the situations that people still considered "wireless," aka radio, to be a novel and wonderful - even mysterious - invention. Every type of situation from utility to obsession to fantasy was part of the experience. Two of the four comics from this set addresses amateur radio scenarios. Note the predilection predicted of viewers or the newfangled (at the time) television (or televisor). Little did the artist know how addictive such contraptions would be - first in the form of TV, then the form personal computer, and finally in the form of the present day video delivery medium of smartphones...

1st Molecular Electronics Chip Developed

1st Molecular Electronics Chip Developed - RF Cafe"The first molecular electronics chip has been developed, realizing a 50-year-old goal of integrating single molecules into circuits to achieve the ultimate scaling limits of Moore's Law. Developed by Roswell Biotechnologies and a multi-disciplinary team of leading academic scientists, the chip uses single molecules as universal sensor elements in a circuit to create a programmable biosensor with real-time, single-molecule sensitivity and unlimited scalability in sensor pixel density. This innovation, appearing this week in a peer-reviewed article in the Proceedings of the National Academy of Sciences (PNAS), will power advances in diverse fields that are fundamentally based on observing molecular interactions, including drug discovery, diagnostics, DNA sequencing, and proteomics. 'Biology works by single molecules talking to each other, but our existing measurement methods cannot detect this,' said co-author Jim Tour..."

PMI's February 2022 Product Announcement

Planar Monolithic Industries' (PMI) February 2022 Product Announcement - RF CafePlanar Monolithic Industries (PMI), a leading supplier of custom, high-reliability MIC/MMIC components and subsystems for applications in space, military, communications, commercial and consumer electronics systems for more than three decades, recently introduced five new products in their extensive line of RF and microwave components. Included are a 1 to 20 GHz successive detection log video amplifier (SDLVA), an integrated microwave filter assembly covering 2 to 6 GHz, a 10 MHz to 18 GHz coaxial power limiter, a 12.8 GHz phase locked dielectric resonator oscillator (PLDRO), and a 4.4 to 7.8 GHz downconverter module...

Electronics at Redstone Arsenal

Electronics at Redstone Arsenal, May 1957 Radio & TV News - RF Cafe"The fact that every part of this ship was built by the lowest bidder." That, according to Gene Kranz (NASA Flight Director during the Gemini and Apollo missions), was Alan Shepard's reply when asked what he thought about as he sat atop the Mercury Redstone rocket*, waiting for liftoff. Shepard knew the boost vehicle, the "Redstone," was originally designed as an expendable ballistic missile and not for safely launching humans into space might have had something to do with it, too. This 1957 vintage article (5 years prior to Shepard's flight), describes some the electronics systems that were used in the program both onboard for stabilization and on the ground for guidance. "A new type computer can solve in five minutes a ballistic trajectory problem which would require a man more than a year to complete." Today, a cellphone app can do it in less than a second...

Pros, Cons of Unions for Engineers

Pros, Cons of Unions for Engineers - RF CafeEngineers' unions have been around in the U.S. for decades, although not nearly in as large a percentage as in Europe. EE Times' Cabe Atwell has an interesting piece entitled "The Pros, Cons of Unions for Engineers," wherein he presents some ups and downs of unions for professional groups like airline pilots, teachers, nurses, etc. Although he makes no specific conclusion on pro vs. con, the conclusion appears to be against unions because of the unique needs, behaviors, and expectations of American (and worldwide) engineers. The chief issues are autonomy in decision making and salary negotiations. It's a good read that will only take a few minutes...

Drones - Putting R/C into War Games

Drones - Putting R/C into War Games, April 1956 Popular Electronics - RF CafeThe term "drone" these days for most invokes the image of a little plastic spider-looking thing with propellers mounted at the ends of the arms - usually with a toothless bumpkin at the controls. Those same people often think drones are relatively new devices. People with a just a little more information automatically classify all radio control (R/C) models, be they traditional fixed-wing aircraft or helicopters, as drones. Pilots of the aforementioned models are even likely, per observers, to have all their teeth and bathe regularly. I happen to be one of the latter type R/C modelers and while I no longer possess all 32 teeth I had at birth, I do bathe regularly. Drones have been around since World War I where they were used for target practice by ground-based marksmen. Once radio remote control became practical, adopting it for use in pilotless aerial platforms was a natural evolution. I have written in the past about what a large contribution hobbyists have made to "drone" technology both through their technical prowess and flying ability...

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...

Many Thanks to Reactel for Their Long-Time Support!

Reactel Filters - RF Cafe

Reactel has become one of the industry leaders in the design and manufacture of RF and microwave filters, diplexers, and sub-assemblies. They offer the generally known tubular, LC, cavity, and waveguide designs, as well as state of the art high performance suspended substrate models. Through a continuous process of research and development, they have established a full line of filters of filters of all types - lowpass, highpass, bandpass, bandstop, diplexer, and more. Established in 1979. Please contact Reactel today to see how they might help your project.

   

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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 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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