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Homepage Archive - June 2022 (page 2)

See Page 1 | 2 | 3 | 4 of the June 2022 homepage archives.
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Tuesday the 14th

Bell Telephone Laboratories - The Transistor

Bell Telephone Laboratories Transistor, June 1952 Radio-Electronics - RF CafeWhen this self-promotion of progress made on the transistor invention by Bell Telephone Laboratories appeared in the June 1952 issue of Radio−Electronics magazine, a mere three and a half years had passed since the announcement of the achievement by Drs. Bardeen, Brattain, and Shockley. Interestingly, it refers to germanium as a metal rather than as a semiconductor. In that interim, many problems had been solved in the effort to make robust, reproducible devices that were affordable replacements for vacuum tubes. One of the primary differences between the most recent transistors and the early models was the use of doped junctions rather than point contacts. This made them more resistant to effects of vibration, temperature changes, and contamination, and also produced higher yields in manufacturing. Gaining the confidence of designers was imperative if the newfangled technology was to gain (pun intended) ground as the preferred component for amplifier, oscillator, mixer, and other type of circuits traditionally...

Reactel Flat-Pack Combline & Interdigital Filter Video

Reactel Flat-Pack Combline & Interdigital Filter Video - RF CafeReactel, industry leaders in the design and manufacture of RF and Microwave filters, diplexers, and sub-assemblies from DC to 67 GHz, recently produced a new video short on Flat-Pack Combline and Interdigital Filters. Benefits of waveguide filters include low insertion loss, center frequencies up to 35 GHz, broadband operation, extremely small overall size, high unloaded "Q." Custom designs are available, along with variations on duplexers, diplexers, multiplexers, switched filter banks, and other configurations. Many off-the-shelf products are available, and Reactel engineers are happy to assist you with determining your system's needs and designing filters to help you succeed. Please take a couple minutes to view this video, and then give Reactel a call...

Men Who Made Radio - C. Francis Jenkins

Men Who Made Radio - C. Francis Jenkins, November 1929, Radio-Craft - RF Cafe"Father of Radiovision" (RV) was the title bestowed upon Charles Francis Jenkins for his work in what would eventually become known as television (TV), which is a very good thing because otherwise mass confusion would have ensued by now due to the ambiguousness of having to contend with a familiar reference to recreational vehicles (RV) when the "other" RV is what was meant ;-) Mr. Jenkins was also the inventor of the Phantoscope motion picture machine. BTW, did you know that the Coast Guard was originally called "Life-Saving Service?" See other "Men Who Made Radio" : Sir Oliver Lodge, Reginald A. Fessenden, C. Francis Jenkins, Count Georg von Arco, E. F. W. Alexanderson, Frank Conrad, Heinrich Hertz...

U.S. Electrical Engineer Salaries in 2021

U.S. Electrical Engineer Salaries in 2021 - RF CafeRF Cafe visitor Jonathan Z. sent me a link to the Bureau of Labor Statistics' Occupational Employment and Wage Statistics page where it reports on salaries of U.S. engineers in 2021. According to them, there were 186,020 electrical engineers (not including self-employed like moi), and the mean wage was $107,890 per year exclusive of bonuses, benefits, stock options, and other incentives. Those in the median (50th percentile) made $100,420. The lowest percentile (10%) pulled in $62,360 - which is about where I am with RF Cafe, and that's with no insurance coverage, retirement, etc. It is just over the point where Obamacare offers a subsidy, and the low-end plan (the Bronze Plan - I call it the Rust Plan) costs >$20k/yr out of pocket (premium cost + deductible for husband and wife over 60 years old), and then only pays 60% of bills. But I digress... The top paying industries for EEs are data processing, oil & gas, technical & trade schools and petroleum & coal extraction. Note the absence of consumer product designers - they're mostly overseas. where most of the stuff we buy is made. Don't worry. Be happy.

Music Power Rating - Help or Hindrance?

Music Power Rating - Help or Hindrance? October 1960 Electronics World - RF CafeMost of us, long before being introduced to the concept of power in electrical circuits, learn about it in terms of mechanical power and/or sound power. It takes some doing to abandon the esoteric nature of power and be trained to grasp the scientific and mathematical aspects of power in all its forms. When the driving source is steady state or a pure sinewave, life is relatively simple, but such is more often than not an exception to the system being studied. Here is a nice, short treatise in a 1960 issue of Electronics World magazine on the concept of sound power that will augment your earlier-learned knowledge of music power rating...

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 to Copper Mountain Technologies for Continued Support

Copper Mountain TechnologiesCopper Mountain Technologies develops innovative and robust RF test and measurement solutions for engineers all over the world. Copper Mountain's extensive line of unique form factor Vector Network Analyzers include an RF measurement module and a software application which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware via USB interface. The result is a lower cost, faster, more effective test process that fits into the modern workspace in lab, production, field and secure testing environments.

Monday the 13th

Electrodrome: Fog and Poison Gas

Electrodrome: Fog and Poison Gas, May 1934 Flying Aces - Airplanes and Rockets1934 was still riding the back of the high voltage craze popularized by Nikola Tesla at the turn of the century. Super high voltage spark gap transmitters were still being used in long distance communications for special applications. William Haight was one of many people engaged in weather manipulation - both its creation and destruction. Transportation, agriculture, and recreation would greatly benefit from the ability to locally and temporarily control weather. This story of Mr. Haight's high-voltage "electrodrome" machine appeared in the May 1934 issue of Flying Aces magazine. Another version of this electrodrome article by author Mel Wharton, entitled "Eliminating the Peril of Fog," appeared in the April 1934 edition of Flying magazine. There he says, "Repeated tests have shown that the operations of dispersing fog is most effective at about 600,000 cycles - though work is done all the way on a range from 500,000 to 1,500,000 cycles. The machine is capable of developing 500,000 volts, but only a fraction of this voltage is found necessary." A 4½ horsepower gasoline engine-powered generator provides the voltage. A May 1935 issue of Popular Mechanics magazine reports on Mr. Haight's electrodrome work...

National Company Advertisement: TVI

 National Company Advertisement: TVI, October 1953 QST - RF CafeOn the page immediately following an article titled "TVI and the Novice," the National Company ran one of its conventional full-page informational advertisements - on the subject of TVI. This one, appearing in the October 1953 issue of QST magazine, is number 234, and it is the newest one I have so there likely were many more. National's suggestion for curing TVI issues was to use a shielded chassis with chokes in series and bypass capacitors in parallel with power leads. A complete list of all my National Company advertisements is at the bottom of the page...

ARRL Seeking Administrative Coordinator for Club Grant Program

ARRL Seeking Administrative Coordinator for Club Grant Program - RF CafeThe ARRL website recently posted a notice seeking an Administrative Coordinator for the ARRL Foundation's Club Grant Program. Is says: "The independent contractor will coordinate, administer, manage, and organize club grant applications at ARRL Headquarters in Newington, Connecticut. The Club Grant Program seeks to fund transformative projects that enable growth for amateur radio operators, on the air projects, ham radio training and mentoring, and more. The program is funded by Amateur Radio Digital Communications (ARDC), and it will award a total of $500,000 in club grants throughout 2022. To apply for this contract position, send a biography or profile to hr@arrl.org. Visit the ARRL website for a complete job description."

Build Your Own "Throbbing" Vibrato

Build Your Own "Throbbing" Vibrato, December 1957 Popular Electronics - RF CafeRF Cafe visitor Jim L. requested that I post this Build Your Own Vibrato article from the December 1957 edition of Popular Electronics magazine. "Make like Elvis with an 'electronic' throbbing guitar," is the pitch line. Vibrato, for the non-musically inclined, is the "wa-wa" sound of an instrument as it smoothly wavers in pitch about a central note. This circuit is for use with an electric guitar, but acoustical stringed instruments like the violin and cello are routinely played with vibrato effect by rocking the finger up and down the length of the string. In typical 1950s style, the project is built with point-to-point wiring rather than using a printed circuit board...

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!

Please Visit Triad RF Systems to Thank Them for Their 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.

Sunday the 12th

Engineering Theme Crossword Puzzle for June 12th

Engineering Theme Crossword Puzzle for June 12th, 2022 - RF CafeThis custom made Engineering Theme Crossword Puzzle for June 12th is provided compliments of 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 puzzle 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 Once Again to everythingRF for Long-Time Support!

everything RF Searchable Database - RF CafePlease take a few moments to visit the everythingRF website to see how they can assist you with your project. everythingRF is a product discovery platform for RF and microwave products and services. They currently have 267,269 products from more than 1397 companies across 314 categories in their database and enable engineers to search for them using their customized parametric search tool. Amplifiers, test equipment, power couplers and dividers, coaxial connectors, waveguide, antennas, filters, mixers, power supplies, and everything else. Please visit everythingRF today to see how they can help you.

Friday the 10th

Rhombic Antennas for Television

Rhombic Antennas for Television, October 1949 Radio & Television News - RF CafeSomehow, after being in the RF business for four decades, I have to admit to not being familiar with the term "acceptance angle" for antennas. That is after having read scores of articles on antennas. Maybe I did and just don't remember - embarrassing. Acceptance angle is mentioned and explained in this 1949 Radio & Television News magazine article during the description of rhombic antenna characteristics versus dipoles and multi-element designs. Although the author focuses on television installations, information provided on signal reflections, shadowing, ghosting, multipath, etc., is applicable to radio as well...

Bluetooth 2022 Market Update

Bluetooth 2022 Market Update - RF Cafe"Every year, the Bluetooth SIG member community works hard to deliver innovations that improve the capabilities of Bluetooth® technology and help shape new market trends. From wireless audio and wearable devices to asset tracking and network lighting control solutions, Bluetooth SIG member companies continue to meet the needs of consumer, commercial, and industrial use cases. Thanks to the hard work of everyone involved, the LE Audio specification project is nearing completion. It is, perhaps, the most complex specification project the Bluetooth SIG has ever taken on, involving hundreds of people across multiple working groups and committees. We look forward to completing the project this year and ushering in the next 20 years of audio innovation..."

IPP Intros 2-8 GHz, 150 W, 2-Way Combiner

Innovative Power Products (IPP) Intros 2-8 GHz 2-Way Combiner - RF CafeInnovative Power Products (visit us at IMS 2022 Booth #4110), a designer and manufacturer of RF and microwave passive components for more than three decades, is pleased to introduce a new 2-way power combiner / divider covering the 2000 to 8000 MHz band, with a power handling capacity of up to 150 watts. The model IPP-1300 combines two coherent input signals or divides one signal into two up to 150 watts CW of total RF power. This combiner/divider is produced in a 1.5" x 2.5" x 1.03" package with a type N connector on the sum port and SMA connectors on the two other ports. This coupler has insertion loss less than 0.55 dB, with phase balance that is less than ±6°. The VSWR is less than 1.30:1, and the amplitude balance is less than ±0.25 dB. The IPP-1300 is also RoHS compliant. Visit our website to download a Technical Data Sheet, drawing PDF, and for Typical Test Data...

American Airlines Seeking Radiomen

American Airlines Seeking Radiomen, April 1948 Radio News - RF CafeFor someone interested in getting into aviation electronics in 1948, this career deal offered by American Airlines was an exceptional opportunity. If chosen for the program, an intense six-month training regimen would prepare the student for a career in radio, radar, navigational aids, and other systems. All living costs would be covered, along with a $120 per month stipend which, according to the Bureau of Labor Statistics' Inflation Calculator, is the equivalent of about $1,450 ($17.4k/yr) in March of 2022. Although I don't have the numbers, my guess is that this was a much better deal than the military was offering at the time, especially considering no conscription was involved. American Airlines began service in 1936, and is one of the few carriers of the era still in operation today...

Consumer Price Index May 2021-2022

Consumer Price Index May 2021-2022 - RF Cafe May 2021-2022 CPI Table - RF CafeThe Bureau of Labor Statistics (BLS) just published their latest numbers on the Consumer Price Index (CPI) for the 12-month period covering May 2021 to May 2022. You probably haven't noticed, but prices for everything has increased significantly. The people responsible for it try to blame Putin due to the war in Ukraine, but if you look at the statistics, the rise began in February 2021 (Ukraine began in 2022). Food is up 10.1% (meat up 14.2%), energy is up 34.6% (fuel oil up 106.7%, electricity up 12.0%), new vehicles up 12.6% (used up 16.1%), airline fares up 37.8%. At 64 years old, my expenses are getting out of hand (including medical with no insurance because Obamacare would cost me >$20k/year). We don't take vacations or engage in much of any activity other than work on our house and on RF Cafe. We don't eat out (McDonald's maybe twice per year), have one vehicle (2011 Jeep Patriot), and a 1,150 sq.ft., 2 bedroom house. Life has gotten pretty rotten for a lot of people in the last year and a half - and it doesn't have to be except for radicals running the show. Hopefully, you are secure in your income, health, and have peace of mind.

Model Plane Control ... with 27-mc Signals

Model Plane Control ... with 27-mc Signals, June 1952 Radio-Electronics - RF CafeDuring the early days of remote (radio) controlled models - airplanes, boats, and cars - the only way to legally operate an R/C was by possessing an amateur radio operator's license. At some point in time around when this article appeared in a 1952 issue of Radio-Electronics magazine, part of the 27 MHz band allocated to Citizens' Band radio was opened to low power radio control. Even then, a radio operator's permit from the FCC was required for use, which in 1974 I paid to obtain (too bad I don't still have it). My first R/C system, purchased used from a guy down the road who was heavily into radio controlled models of all sorts, was on 27.195 MHz. It was a 3-channel Digitron DP−3 system manufactured by OS Digital (in Japan), although there was only analog circuits in the transmitter, receiver, and servos. The FCC designated five frequencies for R/C in the 72 MHz band in 1965, then a total of about 60 channels by the late 1980s. In 2004, the first spread spectrum R/C system was introduced, operating in the 2.4 GHz ISM band. In 1952, there was not much in the way of proportional control of movable surfaces - rudder, elevator, aileron, engine throttle, etc. Motorized servos were just beginning to come to market, but they were basically neutral, full throw left, or full throw right. It was an electromechanical substitute...

Post Your Engineer & Technician Job Openings on RF Cafe for Free

/jobs.htm" target="_top"> 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 /jobs.htm" target="_top">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 to LadyBug Technologies for Long-Time Support!

LadyBug Technologies RF Power Sensors - RF CafeLadyBug Technologies was founded in 2004 by two microwave engineers with a passion for quality microwave test instrumentation. Our employees offer many years experience in the design and manufacture of the worlds best vector network analyzers, spectrum analyzers, power meters and associated components. The management team has additional experience in optical power testing, military radar and a variety of programming environments including LabVIEW, VEE and other languages often used in programmatic systems. Extensive experience in a broad spectrum of demanding measurement applications. You can be assured that our Power Sensors are designed, built, tested and calibrated without compromise.

Thursday the 9th

"Adventures of Ohm"

Adverntures of Ohm - RF CafeWhat began as the "Ohm Confinement" engineering comic series during the Covid farce, when bureaucrats (including politicians, doctors, administrators, and scientists) destroyed the world's normal activity by locking people out of public places and insisting on useless face masks, is now being resurrected as "Adventures of Ohm." The comic's theme is the brainchild of Dr. Ray Ridley and his wife, Denise, and the drawings are done by artist Aya Shaheen. Now that the comic face masks are gone, I'm happy to promote it. Enjoy.

Color Television Past, Present, Future

Color Television Past, Present, Future, January 1954 Radio-Electronics - RF CafeAs with so many aspects of technology, the beginning phases of television - both black and white (B&W) and color - had a variety of competing schemes for accomplishing the objective. For the sake of simplicity, efficiency, and ultimately cost, one solution needed to be agreed upon by industry and government regulatory groups. Manufacturers came up with different ways to build their televisions so that the broadcast standards were met, and then the buying public decide which designs were the best. This article from a 1954 issue of Radio-Electronics magazine was written by none other than Lee de Forest, inventor of the first positive amplification vacuum tube (the Audion). He discusses primarily proposed types of color picture tubes and the raster scan method of an amplitude modulated, steered electron beam energizing phosphorous dots on the face of the cathode ray tube (CRT). I have posted many articles on the development of television systems; a list of most of them is at the bottom of the page. If you are not already familiar with TV's history...

Parallel Resistance Chart

Parallel Resistance Chart, October 1958 Radio-Electronics - RF CafeIf you have ever placed a fixed resistor in parallel with a potentiometer to reduce the total resistance, then you are familiar with how you also convert a linear relationship of the wiper movement with resistance to one that is nonlinear. That is because the equation changes from Rtotal = Rx:potentiometer (where x is the potentiometer position) to Rtotal = (Rx:potentiometer * Rparallel) / (Rx:potentiometer + Rparallel). The graph of it looks like one of the curves in this chart. Since the total parallel resistance is always smaller than the lowest value of the two resistances, the greater the ratio of the two is, the more dominant the smaller resistance value becomes. That means as the potentiometer wiper approaches the minimum resistance end of its travel, the parallel resistor attached across it has virtually no effect...

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.

Thanks to Lotus Communication Systems for Continued Support!

Lotus Communication Systems Modular RF/Microwave Components - RF CafeLotus Communication Systems began in 2009, setting up CNC machine shop and RF/microwave assembling and testing lab in Middlesex Country, Massachusetts. Lotus is committed to highest quality and innovative products. Each RF/microwave module meets exceedingly high standards of quality, performance and excellent value, and are 100% MADE IN USA. Lotus' RF/microwave products cover frequency band up to 67 GHz. Lotus also offers an COTS shield enclosures for RF/microwave prototyping and production. All products are custom designed. We will find a solution and save your time and cost. Lotus has multiple 4 axis CNC machines and LPKF circuit plotters.

Wednesday the 8th

ARRL Youth on the Air (YOTA) June 12-17

ARRL Youth on the Air (YOTA) June 12-17 - RF Cafe''The 2022 Youth on the Air (YOTA) Camp will be on the air and streaming online. The campers will be operating special event station W8Y from the National Voice of America (VOA) Museum of Broadcasting in West Chester Township, Ohio, as well as from their hotel. Activation of W8Y will begin on the evening of Sunday, June 12, and conclude at 1 PM EDT on Friday, June 17. Campers will operate the station as they finish projects, between camp sessions, and during their free time. In addition, dedicated HF station operating times will be on Monday, June 13, from 2 - 11 PM EDT. Dedicated satellite station operating times will be on Thursday, June 16, and Friday, June 17, from 10 AM - 1 PM EDT. Earth-moon-Earth (EME) will be in operation on Tuesday, June 14, and Monday, June 13, from 9 to 11 PM EDT. The opening and closing ceremonies will be streamed live on the Youth on the Air YouTube channel. The opening ceremony will take place on Sunday, June 12..."

Carl & Jerry: Electronic Beach Buggy

Carl & Jerry: Electronic Beach Buggy, September 1956 Popular Electronics - RF CafeYou can go into Walmart (or Radio Shack, when this was first posted) and pick up a pretty decent handheld metal detector for under $100 these days, but in the 1950s even a rudimentary metal detector was a rather large and heavy contraption. So unwieldy were they that most had a belt clip and shoulder straps to help support and manipulate them. That was the situation facing teen electronics aficionados Carl and Jerry as they pondered how to leverage their combined technical prowess to facilitate a thorough combing of the nearby Lake Michigan beach area for treasures of coins, watches, jewelry, cigarette lighters, and other metallic objects given up as lost by weekend seekers of relief from searing hot, humid late summer days. Read on in this 1956 Popular Electronics technodrama to discover how their innocent plans turned into an adventure that helped local law enforcement officers nab a wanted man...

Visit Modelithics at IMS 2022 Booth 7010

Visit Modelithics at IMS 2022 Booth 7010 - RF CafeThe good folks at Modelithics invite you to visit them at Booth 7010 at IM 2022 in Denver, June 19th-24th. "Be sure to register for RF Boot Camp! This one day course is ideal for newcomers to the microwave world, as well as marketing and sales professionals looking to become more comfortable in customer interactions involving RF & Microwave circuits and system concepts and terminology. This year's RF Bootcamp will include speakers from Keysight, Analog Devices, Oregon State U., U. of South Florida, and Modelithics!"

Crystal Diodes in Modern Electronics

Crystal Diodes in Modern Electronics, February 1952 Radio & Television News - RF CafeThis is part 5 in a series that began in the October 1951 issue of Radio & Television News magazine (see part 4). Previous articles dealt with crystal diodes in AM and FM radios, and this article shifts gears by moving into television applications. Crystal diodes were and are still used in frequency generation, envelope detection, frequency mixing, and AC signal rectification. Vacuum tubes could be used for the latter three applications but many physical issues such as size, weight, power consumption, and heat dissipation proved to be major drawbacks as designers strived to reduce the size of electronics assemblies, make them more energy efficient, lower the cost of manufacturing, increase reliability, and decrease weight. Demands for portability was the motivation for much of the work. Early crystal diodes could be noisy and fragile if not mounted carefully, but as will all technology, continual R&D has refined and improved crystals significantly...

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 KR Electronics for Long-Time Support!

KR ElectronicsKR Electronics designs and manufactures high quality filters for both the commercial and military markets. KR Electronics' line of filters includes lowpass, highpass, bandpass, bandstop and individually synthesized filters for special applications - both commercial and military. State of the art computer synthesis, analysis and test methods are used to meet the most challenging specifications. All common connector types and package form factors are available. Please visit their website today to see how they might be of assistance. Products are designed and manufactured in the USA.

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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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The 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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