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Homepage Archive - August 2021 (page 1)

See Page 1 | 2 | 3 | 4 of the August 2021 homepage archives.
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Friday the 6th

Electronics-Themed Comics

Electronics-Themed Comics, September 1944 & June 1945 Radio News - RF CafeWhat better way to wind down a week than to get a chuckle out of some electronics-themed comics from vintage magazines?!?! These three came from WWII-era editions of Radio News. The humor of the depicted scenarios might be lost on people who were not in the workforce back in 1970s and earlier when workplace and supply chain conditions were much different than they are today. Therefore - not to be insulting - I'll give a little insight. Back in the days before online ordering of just about anything the entire world has to offer, service shops and even design centers relied heavily on sales representatives to procure parts. That is the gist of the p53 comic. The p56 comic alludes to when something as harmless as listening to a radio at your workbench was not permitted. Nowadays, of course, you can sit at your workstation with a Bluetooth ear bud and privately listen to anything you want being broadcast from the smartphone in your pocket...

LEO CubeSats Track Ballistic & Hypersonic Missiles

Military LEO Cubesats Track Enemy Ballistic & Hypersonic Missiles - RF Cafe"The US Department of Defense's Missile Defense Agency is using a pair of CubeSats to develop a system to track hostile ballistic and hypersonic missiles from launch to impact. Part of the Nanosat Testbed Initiative, the CubeSat Networked Communications Experiment (CNCE) Block 1 was launched from the Mojave Air and Space Port in California on June 30 for a three-month technology demonstration mission. As hypersonic missiles rapidly move toward becoming practical weapons, the problem of how to counter them is also on the agenda. One American response being developed by the MDA is the Hypersonic and Ballistic Tracking Space Sensor (HBTSS), which is being developed in competition between Northrop Grumman, Raytheon, Leidos, and L3Harris. When deployed aboard satellites in low-earth orbit, the HBTSS aims to globally track hypersonic missiles in all phases of their flight..."

EMC Antennas for Pre-Compliance Testing

EMC Antennas for Pre-Compliance Testing - RF CafeMr. Kenneth Wyatt, always dependable for a useful short article on RF subjects, has a piece on the EDN website entitled, "EMC Antennas for Troubleshooting and Pre-compliance Testing." He begins: "EMC antennas are an important component for capturing radiated harmonic emissions from products being tested. There are two considerations: simple troubleshooting or calibrated pre-compliance testing. For troubleshooting purposes, most any uncalibrated antenna may be used. I’ve even had clients use Wi-Fi antennas for detecting emissions in the 50 to 200 MHz range. Basically, if your antenna can sense the emissions, it can be used for general troubleshooting. Pre-compliance testing, on the other hand, is where you’re trying to duplicate the emissions testing as performed by an EMC test lab and that will require a more expensive calibrated antenna..."

RF Cafe Quiz #9: A Smorgasbord of RF Topics

RF Cafe Quiz #9: A Smorgasbord of RF Topics - RF CafeAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. This "A Smorgasbord of RF Topics" quiz touches on a wide range of subjects ranging from Bluetooth to WLAN and ESD testing standards.

Mt. Palomar Telescope Pyrex Mirror Blank

Mt. Palomar Telescope Pyrex Mirror Blank in the May 29, 1948, edition of The Saturday Evening Post - RF CafeHere is an advertisement by Corning from the May 29, 1948, edition of The Saturday Evening Post. The Hale 200-inch telescope mirror was dedicated for service at Mount Palomar on June 3, 1948, at the in honor of George Ellery Hale. As a side note, it is interesting that in the magazine of the era (which were typically quite large in width and height), actual photographs like this one were rarely used in advertisements. The vast majority of artwork was... artwork - pencil drawings or actual paintings. Tomorrow a new door to the secrets of the universe will be gin to open. A door through which astronomers will be able to see 6,000,000,000,000,000,000,000 miles into space...

New for 2020! RF & Electronics Symbols for Visio

RF Electronics Wireless Analog Block Diagrams Symbols Shapes for Visio - RF CafeWith more than 1000 custom-built symbols, this has got to be the most comprehensive set of Visio Symbols available for RF, analog, and digital system and schematic drawings! Every object has been built to fit proportionally on the provided A-, B- and C-size drawing page templates (or can use your own). Symbols are provided for equipment racks and test equipment, system block diagrams, conceptual drawings, and schematics. Unlike previous versions, these are NOT Stencils, but instead are all contained on tabbed pages within a single Visio document. That puts everything in front of you in its full glory. Just copy and paste what you need on your drawing. The file format is XML so everything plays nicely with Visio 2013 and later...

Thanks Again to Bittele Electronics for Continued Support!

Bittele Electronics PCB Fabrication - RF CafeSince 2003, Bittele Electronics has consistently provided low-volume, electronic contract manufacturing (ECM) and turnkey PCB assembly services. It specializes in board level turnkey PCB assembly for design engineers needing low volume or prototype multi-layer printed circuit boards. Free Passive Components: Bittele Electronics is taking one further step in its commitment of offering the best service to clients of its PCB assembly business. Bittele is now offering common passive components to its clients FREE of Charge.

Thursday the 5th

Electronic Navigator

Electronic Navigator, October 1945 Radio-Craft - RF CafeHere is yet another report on the wonders of radar technology as the country was coming out of the throes of war. As mentioned before, radar was a highly classified science during World War II, and it is credited, along with the Douglas C-47 and the Jeep (two of General Eisenhower's four "Tools of Victory") for being a major contributor to Allied success. At the beginning of war, when radar operators in Hawaii were misinterpreting squadrons of attacking Japanese aircraft for a flight of B-17 bombers being ferried from the mainland, radar displays were essentially x-y axis oscilloscopes indicating range and signal strength. By the end of the war, the antenna-synchronized rotating plan position indicator (PPI) format had been introduced, providing a much more useful format for determining target situations. Radar was adapted...

Ultracold Transistors Serve as Memory Devices

Ultracold Transistors Serve as Memory Devices - RF Cafe"Digital transistors - assembled by the billions in today's computer chips - act as near-perfect electronic switches. In the "on" position, achieved when an above-threshold voltage is applied to the device, the transistor allows current to flow. When the switch is off, the transistor prevents the flow of current. The on/off positions of the switch translate into the 1s and 0s of digital computation. Although these 1s and 0s are fundamental to the operation of a computer, complex computations require that the data be stored in memory in order to be useful. In today's chips, memory relies on another device, in addition to the transistor: a capacitor that stores electric charge. The capacitor is empty when the transistor is switched off and flooded with electric charge when the transistor switches on. The charge on the capacitor then preserves the 1 or 0 of the transistor's switch state..."

Honeywell HE-240A Whole House Humidifier Installation

Honeywell HE240A Whole House Humidifier Installation - RF CafeA large portion of the U.S. has experienced prolonged periods this winter with temperatures substantially below long-term averages. That means heating systems have been running much more often than usual, and if you have a forced hot air system, that means the indoor humidity level has been much lower than normal. In northern areas like where I live, humidity can easily drop to near zero. Because of that, triboelectric charging to high voltage potential occurs merely by walking a few steps across a carpet, resulting in a sometimes painful discharge arc when a metal object is touched. The only way to mitigate low humidity conditions is to add water back into the air. The preferred option, IMHO, is to install a whole-house humidifier that resides on the furnace ductwork, has its own regulated water supply, and is controlled by a humidistat. After a couple weeks of refilling three free-standing humidifiers two to three times a day and listening to the fans, I decided it would be worth the expense and effort to install a whole-house humidifier. The Honeywell HE240A whole-house humidifier with a couple additional parts...

Many Thanks to Amplifier Solutions Corporation (ASC) for Continuing Support!

Amplifier Solutions Corporation (ASC) - RF Cafe ASC designs and manufactures hybrid, surface mount flange, open carrier and connectorized amplifiers for low, medium and high power applications using gallium nitride (GaN), gallium arsenide (GaAs) and silicon (Si) transistor technologies. ASC's thick film designs operate in the frequency range of 300 kHz to 6 GHz. ASC offers thin film designs that operate up to 20 GHz.  

The Swiss Quad Antenna at ZS6PP

The Swiss Quad Antenna at ZS6PP, September 1967 QST - RF CafeThis design for a "Swiss Quad" antenna appeared in the September 1967 edition of QST magazine. One of its touted strong points is not needing spreaders or a boom. I am not an antenna design guy, so I can't comment on its usefulness. No gain measurement was provided by the author. The article states that the antenna had not yet enjoyed widespread adaptation in the U.S. at the time of the writing. A Google search for Swiss Quad antennas turns up a handful of modern examples: IW5EDI, VK4JU, LU7MGP. I could not locate an example of a computer-generated gain plot (radiation pattern) for the Swiss Quad, so if you know where one exists, please let me know so I can post a hyperlink...

EW&RS Engineering Handbook - Doppler Shift

Electronic Warfare and Radar Systems Engineering Handbook - Doppler Shift - RF CafeFor a long time, the Electronic Warfare and Radar Systems Engineering Handbook was very difficult to locate unless you knew right where to go. Over time, some websites had been posting the file on their own servers, but it is a pretty big PFD file, and it really has not been very well indexed by Google or Yahoo or the other search engines. Therefore, I have broken it into smaller parts and posted it in HTML format. That will make viewing specific chapters much faster and easier. This chapter on Doppler Shift is typical of the manner in which subjects related to EW and radar engineering are put in layman's terms...

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...

Thanks Once Again for Windfreak's 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.

Wednesday the 4th

Stratovision

Stratovision, October 1945 Radio-Craft - RF CafeBefore comprehensive coaxial and optical cable or even microwave relay networks were available for commercial use, an experimental aircraft-based system was tested for broadcasting educational television and other messaging data. The "Stratovision" platform essentially provided a couple 20,000-foot-high antennas with a footprint covering hundreds of miles. This 1945 Radio-Craft magazine article entitled ,"Stratovision" was one of the earliest to report on plans to provide a coast-to-coast nationwide matrix of coverage as shown in the accompanying illustration. Two outfitted airplanes would be in the air within each region at all times to ensure redundancy and high quality service. Boeing B−29 Superfortress airplanes (the Enola Gay was a B−29) were used at least in part because they provided a human-friendly environment at high altitudes for long period of time...

UK Set to Launch from British Soil

UK Set to Launch from British Soil - RF Cafe"Another step towards space exploration from UK soil has been unlocked, with the passing of the spaceflight regulations, Transport Secretary Grant Shapps announced 29 July 2021. The legislation provides the framework to regulate the UK space industry and enable launches to take place from British soil for the very first time. It will unlock a potential 4 billion pounds of market opportunities over the next decade, creating thousands of jobs and benefiting communities right across the UK. This also puts the UK in a unique position as the first country in Europe able to launch spacecraft and satellites from home soil..."

Electronic Sticklers

Electronic Sticklers, May 1959 Popular Electronics - RF CafeHere are a few more electronics conundrums with which to exercise the old noodle. These are puzzlers from a 1959 issue of Popular Electronics magazine, but at least one of them (#4) will likely prove to be a real stickler unless you have seen a similar resistor mesh problem before (see my solution for the resistor cube equivalent resistance). There are no tube circuits to use as an excuse for not attempting them - just resistors, batteries, switches, meters, a motor, and a couple light bulbs. All four would be fair game to present to an interviewee to see where he/she stands on basic circuit analysis...

China Starts Construction of 1st Small Modular Reactor

China Starts Construction of 1st Small Modular Reactor - RF CafeI've long hoped to per-household-sized nuclear power generators that would eliminate the need for an electrical distribution system, thereby eliminating single-point system failures. It looks like China is on its way with its new reactors powered by melt-down-proof thorium salts. While not personal sized yet, it's a start. The U.S. Department of Energy has begun a similar program called Advanced Small Modular Reactors (SMRs), but has not advanced much beyond the conceptual phase. Toshiba published info on its Micro Nuclear Reactor in the 2007 timeframe, but it has disappeared now. Mechanix Illustrated, Popular Science, et al, magazines promised me in the 1970s that we'd have them by the year 2000, and at 63 years old in 2021 I'm still waiting...

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."

Tuesday the 3rd

Mac's Electronics Service: Openers, Anyone?

Mac's Electronics Service: Openers, Anyone?, August 1962 Electronics World - RF CafeThis August 1962 installment of "Mac's Electronics Service" entitled "Openers, Anyone?" discussed remote garage door openers that were getting popular in the day. As usual there is a valuable lesson taught in the story, but what really stands out in this case is how the diodes in the schematic have a "+" sign shown on the cathode. Surely it was a printer's mistake since even though that was the era when great debates were taking place over whether electrical current flowed from positive to negative or vice-versa, there was no argument over whether the more negative voltage needed to be connected to the cathode (vacuum tube or semiconductor) in order for current to flow. The header image accompanying John Frye's "Mac's Service Shop" technodramas underwent half a dozen or so versions throughout its multi-decade run. It is the first I recall seeing this particular version. The title of the series also evolved over time to reflect the era...

Introduction to Amplifiers: Feedback

NEETS Module 8 - Introduction to Amplifiers: Feedback - RF CafeA more common configuration for transistor amplifiers is the common-emitter configuration. Positive feedback is a little more difficult with this configuration because the input and output signals are 180º out of phase. Positive feedback can be accomplished by feeding a portion of the output signal of the second stage back to the input of the first stage. This arrangement is shown in figure 1-19. The figure shows that each stage of amplification has a 180º phase shift. This means that the output signal of Q2 will be in phase with the input signal to Q1. a portion of the output signal of Q2 is coupled back to the input of Q1 through the feedback network of C3 and R3. R3 should have a large resistance to limit the amount of signal through the feedback network...

Light Bent to Enhance Wavelength Conversion

Light Bent to Enhance Wavelength Conversion - RF Cafe"Electrical engineers from the UCLA Samueli School of Engineering have developed a more efficient way of converting light from one wavelength to another, opening the door for improvements in the performance of imaging, sensing and communication systems. Mona Jarrahi, professor of electrical and computer engineering at UCLA Samueli, led the Nature Communications-published research. Finding an efficient way to convert wavelengths of light is crucial to the improvement of many imaging and sensing technologies. For example, converting incoming light into terahertz wavelengths enables imaging and sensing in optically opaque environments. However, previous conversion frameworks were inefficient..."

Please Thank IPP for Their Long-Time Support!

Innovative Power ProductsInnovative Power Products (IPP) has over 30 years of experience designing & manufacturing RF & microwave passive components. Their high power, broadband couplers, combiners, resistors, baluns, terminations and attenuators are fabricated using the latest materials and design tools available, resulting in unrivaled product performance. Applications in military, medical, industrial and commercial markets are serviced around the world. Please take a couple minutes to visit their website and see how IPP can help you today.

China's Fresh Grads Prefer Civil Service Jobs

China's Fresh Grads Prefer Civil Service Jobs - RF CafeThe full headline from the South China Morning Post reads: "China's job scarcity sees fresh grads shun private sector for stable civil service jobs, as 'government is too big to fail.'" This is happening in the U.S. as well - especially for non-technical jobs (like those sought by people with degrees ending in "Studies"). "Skyrocketing living costs and mounting uncertainties have become unbearable for those who desire security, peace of mind and reasonable working hours that the private sector may not offer." Further, is states a growing shang'an mentality among the young, which literally means "going onto the shore" describes a growing desire among take lower paying but more secure jobs in the public sector. The expression is the opposite of his parents' generation: xiahai, or "going down to the sea, referring to a movement during China's period of reform and opening up that began in the late-1970s, when droves of people quit their government positions to become entrepreneurs and explore a "sea" of business opportunities...

Wave Propagation and Antennas

NEETS, Module 10 Wave Propagation, Transmission Lines, and Antennas - RF CafeA "V" Antenna is a bi-directional antenna used widely in military and commercial communications. It consists of two conductors arranged to form a V. Each conductor is fed with currents of opposite polarity. The "V" is formed at such an angle that the main lobes reinforce along the line bisecting the "V" and make a very effective directional antenna (see figure 4-35). Connecting the two-wire feed line to the apex of the "V" and exciting the two sides of the "V" 180 degrees out of phase cause the lobes to add along the line of the bisector and to cancel in other directions, as shown in figure 4-36. The lobes are designated 1, 2, 3, and 4 on leg AA', and 5, 6, 7, and 8 on leg BB'. When the proper angle between AA' and BB' is chosen, lobes 1 and 4 have the same direction and combine with lobes 7 and 6, respectively. This combination of two major lobes from each leg results in the formation of two stronger lobes, which lie along an imaginary line bisecting the enclosed angle...

New for 2021! RF & Electronics Symbols for Office™

RF & Electronics Schematic & Block Diagram Symbols for Office™ r2 - RF CafeIt was a lot of work, but I finally finished a version of the "RF & Electronics Schematic & Block Diagram Symbols" that works well with Microsoft Office™ programs Word™, Excel™, and Power Point™. This is an equivalent of the extensive set of amplifier, mixer, filter, switch, connector, waveguide, digital, analog, antenna, and other commonly used symbols for system block diagrams and schematics created for Visio™. Each of the 1,000 or so symbols was exported individually from Visio in the EMF file format, then imported into Word on a Drawing Canvas. The EMF format allows an image to be scaled up or down without becoming pixelated, so all the shapes can be resized in a document and still look good. The imported symbols can also be UnGrouped into their original constituent parts for editing. Check them out!

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.

Monday the 2nd

Nazi Morale Radio

Nazi Morale Radio, October 1945 Radio-Craft - RF Cafe"Morale Radio" sets were manufactured by many companies and provided to service men for entertainment and hearing news from back home and around the world. Unsubstantiated sources claim American companies were paid cost + 15% for each set. Other countries made similar "Morale Radios" for their troops, or procured sets from elsewhere and made necessary modifications to suit their format. Not a whole lot of information can be found about them on the WWW, and finding a photo of one of the German Wehrmacht radios with the Swastika and eagle on it is darned near impossible, other than the one shown in this 1945 Radio-Craft magazine article. Part of the reason for the scarcity is the German people's desire to destroy as much of the Nazi (National Socialist German Workers' Party) history as possible both to put the horrible era behind them...

Battery Revolution Just Getting Started

Battery Revolution Just Getting Started - RF Cafe"We're living in battery-powered times. Incredible amounts of capital are going into gigaplants that produce millions of battery cells per day, and there are rivers of cash flowing to R&D on advanced batteries. There are fortunes to be made and new megacorporations to be built. Not only will batteries be needed for our phones, laptops, power tools, cars, ships, and planes, but also to store energy from renewable sources. Batteries are key to decarbonizing our economies. It would be great if batteries could improve exponentially, à la Moore's Law. But it'll never happen. Gordon Moore himself told us so in his seminal 1965 magazine article, in which he predicted that we would be able to double the number of components in a digital integrated circuit every year for the next 10 years. He also said that the same..."

RF & Microwave Jobs Openings at RGNext

RF & Microwave Jobs Openings at RGNext - RF CafeWebsite visitor Neil S. requested that I post information about the many openings for RF and microwave engineers, technicians, analysts, and managers at the company where he works - RGNext (Range Generation Next). RGNext employees serve on the forefront of our nation's access to space and defense of our nation. RGNext offers their team of experienced, professional employees an environment that challenges, stimulates and provides personally and professionally rewarding career opportunities. RGNext is looking for qualified individuals for assignments in the Marshall Islands, Ascension Island, California, Alabama, and Florida.

Many Thanks to Exodus Advanced Communications for Their Support

Exodus Advanced Communications - RF CafeExodus Advanced Communications is a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide. Power amplifiers ranging from 10 kHz to 51 GHz with various output power levels and noise figure ranges, we fully support custom designs and manufacturing requirements for both small and large volume levels. decades of combined experience in the RF field for numerous applications including military jamming, communications, radar, EMI/EMC and various commercial projects with all designing and manufacturing of our HPA, MPA, and LNA products in-house.

Introduction to Amplifiers: Coupling

NEETS Module 8 - Introduction to Amplifiers: Coupling - RF CafeNotice that the output (collector) of Q1 is connected directly to the input (base) of Q2. The network of R4, R5, and R6 is a voltage divider used to provide the bias and operating voltages for Q1 and Q2. The entire circuit provides two stages of amplification. Direct coupling has several disadvantages, however. The major problem is the power supply requirements for direct-coupled amplifiers. Each succeeding stage requires a higher voltage. The load and voltage divider resistors use a large amount of power and the biasing can become very complicated. In addition, it is difficult to match the impedance from stage to stage with direct coupling. The direct-coupled amplifier is not very efficient and the losses increase as the number of stages increase...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. Chances are you have never used a spreadsheet quite like this (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!

Sunday the 1st

Physics & Science Theme Crossword Puzzle for August 1st

Physics & Science Theme Crossword Puzzle for August 1st, 2021 - RF CafeThis Physics & Science Theme crossword puzzle for August 1st, 2021, contains only words and clues related to engineering, mathematics, chemistry, physics, and other technical words. 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., Hedy Lamarr or the Bikini Atoll). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

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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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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