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Homepage Archive - June 2022 (page 1)

See Page 1 | 2 | 3 | 4 of the June 2022 homepage archives.
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Tuesday the 7th

GE Radio Models 102, 114, 115 Schematic & Parts List

General Electric Models 102, 102W, 107, 107W, 114, 114W, 115, 115W Schematic & Parts List, July 1948 Radio News - RF CafeThis Radio Service Data Sheet covers General Electric Models 102, 102W, 107, 107W, 114, 114W, 115, and 115W receivers. Most - if not all - electronics servicemen had subscriptions to these magazines because they were a ready source of not just these service sheets, but because of the extensive articles offering advice on servicing radios and televisions. In fact, many electronics manufacturers had a policy of supplying service data only to bona fide shops. A large list is included at the bottom of the page of similar documents from vintage receiver schematics, troubleshooting tips, and alignment procedures. They were originally published in magazines like Radio-Craft, Radio and Television News, Radio News, etc. I scan and post them for the benefit of hobbyists who restore and service vintage electronics equipment...

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!

Putin's Electronic Warfare Turns Tide of War

Putin's Electronic Warfare Turns Tide of War - RF CafeRiddle me this, Riddler: When is a war not a war? "As Russian forces push for territorial gains in eastern Ukraine, they're turning to a military capability they've largely forgone during the war but is expected to give them an edge: electronic warfare. After earlier failing to topple Ukraine's government, Russia's military has focused its offensive on the country's eastern Donbas region, which is home to a large population of Russian speakers. New reporting shows Russian forces are increasingly intercepting the Ukrainian military's communications while jamming navigation and guidance systems. 'They are jamming everything their systems can reach,' an official with the Aerorozvidka, a Ukrainian agency that develops unmanned aerial vehicles and other military capabilities, told the Associated Press in a report published Friday. 'We can't say they dominate, but they hinder us greatly..."

RF Cascade Workbook

RF Cascade Workbook - RF Cafe RF Cascade Workbook is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. Chances are you have never used a spreadsheet quite like this (click here for screen capture). It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features...

Please Thank Lotus Communication Systems for Their 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.

Monday the 6th

Electronics-Themed Comics from Radio News

Electronics-Themed Comics, October 1946 and September 1950 Radio & Television News - RF CafeThese electronics / technology themed comics from vintage hobby and trade magazines were not originally colorized since color printing was typically reserved for front and rear covers and maybe monotone color for higher priced advertisements. Even shades of gray were rare, so varying line widths and tiny dotted fill areas were used to give depth to an image. Similar techniques are still used today in newspaper weekday comics that are not colorized. Accordingly, the color in these comics was added by yours truly in order to make them more appealing. Feel free to use them in your presentations and office cubicles, but please include an attribute to RFCafe.com. BTW, the cow in the comic is using a Handy-Talkie, not a cellphone. Note the source of the upsetting commercial in the other comic is a radio, not even a TV. Finally, the germanium vs. germanium gag was popular back in the early days of semiconductors...

Many Thanks to Axiom Test Equipment for Continued Support!

Axiom Test Equipment - RF CafeAxiom Test Equipment allows you to rent or buy test equipment, repair test equipment, or sell or trade test equipment. They are committed to providing superior customer service and high quality electronic test equipment. Axiom offers customers several practical, efficient, and cost effective solutions for their projects' TE needs and is committed to providing superior customer service and high quality electronic test equipment. For anyone seeking a way to offload surplus or obsolete equipment, they offer a trade-in program or they will buy the equipment from you. Some vintage items are available fully calibrated. Please check out Axiom Test Equipment today!

SAGE - Whirlwind Defense Quarterback Goes into Operation

SAGE - Whirlwind Defense Quarterback Goes into Operation, August 1956 Popular Electronics - RF CafeThe Semi-Automatic Ground Environment (SAGE) system was designed and built to monitor the flights of both intercontinental ballistic missiles and hostile aircraft - if they were ever to occur, which, thankfully, they did not. Nuclear bombs were of particular interest since they could be launched not just from the USSR, which was the only other nuclear power in 1956, but also from offshore aircraft carriers and submarines. This was the beginning of the era when school kids participated in practice drills of getting under their desks in the event of an attack. I remember doing it in the mid 1960s while in grade school. Some of the equipment described here represents the earliest computerized digital technology, including magnetic core memory. This 1956 issue of Popular Electronics magazine reports on the system. According to the Wikipedia entry, SAGE did not go into full operation until 1958...

Worldwide Spectrum Allocations Poster by R&S

Worldwide Spectrum Allocations Poster by Rhode & Schwarz - RF CafeRohde & Schwarz just published a new Worldwide Spectrum Allocations poster and is making is available a no cost either as a high resolution PDF file for download or a paper version for hanging on your wall. "The national and international spectrum allocations have undergone over 4,000 changes since the World Radio Conference 2012 (WRC-12). Following the most recent WRC-19 and publication of the ITU Radio Regulations Articles Edition of 2020, we have updated the Worldwide Spectrum Allocations Poster to reflect these changes. Among the many changes included in the new poster are the new frequency allocations for 5G communications (5GNR FR1 and FR2), new GNSS frequency allocations, and separate allocations legends for Mobile Satellite Earth-to-Space and Space-to-Earth communications for easier identification..."

78th Anniversary of Operation Overlord

Hallicrafters Advertisement Operation Overlord D-Day, July 1944 QST - RF CafeWith today being the 78th anniversary (June 6, 1944) of the D-Day invasion of Normandy (aka Operation Overlord) and other beachheads on the coast of France, I thought posting this advertisement from the July 1944 edition of QST magazine would be apropos. This issue of the magazine probably arrived in ARRL member's mailboxes within a couple weeks of the miraculously successful invasion of Omaha Beach, Utah Beach, Gold Beach, Juno Beach, and Sword Beach. When you consider that in those days - and also not so long ago for that matter - the lead time for going to the printing presses was measured in months, the fact that this ad made the final cut for the next month's issue (July) is noteworthy. Accordingly, I duly make note. Back in the 1980s, there was a big push for commercial-off-the-shelf (COTS) equipment to be used in military equipment in order to save money. It was the era of $600 hammers and $7000 coffee makers manufactured by defense contractors. The Project On Government Oversight (POGO) was created to address concerns. Anyway, donations of equipment and components from private citizens...

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 to ISOTEC for Continued Support!

ISOTEC Corporation - RF CafeSince 1996, ISOTEC has designed, developed and manufactured an extensive line of RF/microwave connectors, between-series adapters, RF components and filters for wireless service providers including non-magnetic connectors for quantum computing and MRI equipments etc. ISOTEC's product line includes low-PIM RF connectors components such as power dividers and directional couplers. Off-the-shelf and customized products up to 40 GHz and our low-PIM products can meet -160 dBc with 2 tones and 20 W test. Quick prototyping, advanced in-house testing and high-performance. Designs that are cost effective practical and repeatable.

Sunday the 5th

RF & Microwaves Theme Crossword Puzzle for June 5th

RF & Microwaves Theme Crossword Puzzle for June 5th, 2022 - RF CafeThis custom made RF & Microwaves theme crossword puzzle for June 5th 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 to TotalTemp Technologies for Continued Support!

TotalTemp Technologies - RF CafeTotalTemp Technologies has more than 40 years of combined experience providing thermal platforms. Thermal Platforms are available to provide temperatures between −100°C and +200°C for cryogenic cooling, recirculating circulating coolers, temperature chambers and temperature controllers, thermal range safety controllers, space simulation chambers, hybrid benchtop chambers, custom systems and platforms. Manual and automated configurations for laboratory and production environments. Please contact TotalTemp Technologies today to learn how they can help your project.

Friday the 3rd

Painless Reconversion

Painless Reconversion, September 1947 QST - RF CafeWhen the FCC forbade amateur radio operators from transmitting during the years encompassing World War II (with a few exceptions), many Hams who were very active in the hobby went a bit stir crazy and began looking for other pastimes. They could still listen to other broadcasts, but no CW or phone transmissions were allowed. Author Chester Cunningham recounts here his chosen replacement avocation - aviation. His humorous story demonstrates one way Hams, whose curtailed radio activities resulted in equipment that had atrophied as a result of nonuse and hard to find replacement parts (all resources went to the war effort), were able to convince their XYLs of expenditures needed to resurrect the shack. Note that in 1943 the cost per hour to rent an airplane solo (w/o instructor) was $7 per hour. If my memory serves me correctly, in 1978 I was paying about $18 per hour to rent a Piper Colt solo, and $24 per hour w/instructor at Lee Airport in Edgewater, Maryland. Per the BLS's Inflation Calculator, $7/hour in 1943 is the equivalent of $96/hour in 2016 ($116 in 2022)...

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.

National Advertisement: AC Power Strip

National Advertisement: AC Power Strip, April 1939 QST - RF CafeCould this be the world's first publically documented rack-mounted AC power strip? The National Company of Cambridge, Massachusetts, which began life as the National Toy Company, ran a long series of advertisements in QST and other electronics magazines that were heavy on text and light on pictures - definitely not the norm in advertising. This one, number 62, from a 1939 issue describes, along with a reference frequency oscillator, how their engineering team fabricated what we now call an AC power strip for use in an equipment rack. According to the sketch provided, there does not appear to be an On/Off switch and almost certainly not any form of surge protection as is common (maybe even required by UL) for modern power strips. Someone at National should have patented the idea; their heirs would be rich today.

China's Telescope on Far Side of Moon Cannot Escape Radio Noise

China's Telescope on Far Side of Moon Cannot Escape Radio Noise - RF Cafe"Chinese scientists are working on a plan to save the only radio telescope operating on the far side of the moon from major noise problems that are stopping its attempts to explore the universe. Making observations from the far side of the moon has long been a goal for astronomers because the radio environment there is so much cleaner than the Earth's. An instrument on board the Chang'e 4 lander was intended to scan the universe free from radio interference from Earth but the reality is proving trickier Scientists knew radio noise from the lander would be a problem, but now need another solution after their initial precautions did not prove effective..."

Sarkes Tarzian Silicon Rectifiers Advertisement

 Sarkes Tarzian Silicon Rectifiers Advertisement, August 1957 Radio & TV News - RF CafeI have to admit that when I saw this large advertisement for the Sarkes Tarzian company in Radio & TV News magazine, I didn't recall ever having heard of the company. According to Wikipedia, "Sarkes Tarzian (1900-October 1987) was an American engineer, inventor, and broadcaster... He attended the University of Pennsylvania and received an undergraduate degree in 1924 and a graduate degree in 1927. Tarzian worked for the Atwater Kent company and then for RCA... He founded the manufacturing company Sarkes Tarzian Enterprises in 1944, and was involved in early experiments in VHF audio broadcasting in 1946. Tarzian was a member of the Rotary Club. In 1949 he started television station WTTV in Bloomington. He sold that station in 1978. The Sarkes Tarzian company was an important manufacturer of radio and television equipment, television tuners, and components. Its FM radio receivers helped to popularize the broadcast medium..."

RF Cascade Workbook

RF Cascade Workbook - RF Cafe RF Cascade Workbook is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. Chances are you have never used a spreadsheet quite like this (click here for screen capture). It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features...

Please Thank IPP for Their Long-Time Support!

Innovative Power ProductsInnovative Power Products (IPP) has over 35 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. Products listed on website link to detailed mechanical drawings that contain electrical specifications as well as performance data. Please take a couple minutes to visit their website and see how IPP can help you today. 

Thursday the 2nd

Sunspots Mar TV Reception

Sunspots Mar TV Reception, August 1957 Radio & TV News - RF CafeWe have long known that activity on our sun affects electromagnetic communications. Energetic particles, primarily electrons, explode from the sun's surface (coronal mass ejections and flares) and are hurled at blazing speeds towards the earth at an average speed of around 424 km/s (263 mi/s). They begin affecting our upper atmosphere about four days later by ionizing atoms, thereby altering electrical conduction properties. This in turn determines how and whether electromagnetic signals either pass through the atmosphere into space or get refracted (bent) back down toward Earth. Long distance communications in particular are effected, but often even local communications are impacted as well. Some events have little effect, some cause minor disruptions in communications, some cause local communications blackouts, and some are significant enough to cause entire power grids to fault and shut down. Frequency and intensity of the CMEs and flares is correlated with the well-established 11-year (approximately) cycle between solar maximums...

Thanks to Alliance Test Equipment for Long-Time 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.

Ten Years of Transistors

Ten Years of Transistors, May 1958 Radio-Electronics - RF CafeDid I ever tell the story about a manager I had at a major defense electronics firm who thought he could make an NPN transistor by wiring two diodes in series with the anodes tied together? He reasoned that since a bipolar junction transistor consisted of three alternating layers of n-type and p-type silicon, the device could be affected per his scheme. That was in the mid 1980s when I was still a technician (working diligently on my BSEE degree at night). Needless to say the engineers who worked under him were not too impressed with the guy's technical prowess (nor his managerial prowess, as I remember it). I didn't consider myself qualified at the time to judge him one way or the other, so the fact that he was a good guy made him OK in my book. This article from the year I was born (some doubt the 'born' claim) reports on the advancements during the first decade of the transistor era. It was just before Christmas of 1948 that Mssrs. Brattain, Bardeen, and Shockley announced to the world their universe-changing invention...

Strategy for C.O.D. Service

Strategy for C.O.D. Service, December 1957 Radio & TV News - RF CafeDeadbeat customers have been a problem since time immemorial. Said dirt bags ask you to perform a service and/or provide a product and then either try to cheat you out of full payment or refuse to pay at all. Back in the days when repairmen made in-home visits for radio and television sets, evidently the problem could be really bad. Art Margoli wrote this article for Radio & TV News magazine in 1957 describing methods he devised to handle, and most importantly avoid, uncomfortable situations and stave off ugly confrontations with customers. One such scheme was to have customers sign a "cognovit note," which is an extraordinary document by which a debtor authorizes his or her creditor's attorney to enter a confession in court that allows judgment against the debtor. Of course litigation would probably cost more than the bill was worth and therefore would not likely be pursued, but the cognovit note appeared intimidating with sufficient legalese to give pause to the seasoned feckless homeowner. If you are in business for yourself and have similar issues, maybe something here will work for you...

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 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.

Wednesday the 1st

Mac's Radio Service Shop: Whose Ox Is Gored?

Mac's Radio Service Shop: Whose Ox is Gored?, September 1950 Radio & Television News Article - RF CafeThe meaning of the title of this Mac's Radio Service Shop story, "Whose Ox Is Gored?," is perfectly obvious to me, having grown up in an era when the saying was commonplace. However, my guess is that a lot of people have never heard it, and it makes no sense. A search for the origin of the idiom turned up lots of guesses, but no definite source. Some say it came from a writing by Martin Luther, others say from the Bible, but all agree that it basically means the assessment of a situation (usually a wrong having been done) depends on the individual's point of view. In this case, Mac points out to Barney how the annoying inattention to detail provided by mechanics during servicing of his car are not so different from the "little" things Barney himself has let slip by because he did not believe they were important enough to be of concern. This appeared in a 1950 issue of Radio & Television News magazine...

Exodus AMP2065B, 6–18 GHz, 300 W TWT Replacement SSPA

Exodus AMP2065B-LC, 6–18 GHz, 300 W TWT Replacement SSPA - RF CafeExodus Advanced Communications, is a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide. We are pleased to present the new Exodus AMP2065B-LC, 6.0−18.0 GHz, 300 watt, TWT replacement solid state power amplifier (SSPA). Exodus AMP2065B-LC is designed for replacing aging TWT technology. A broadband, rugged EMC Class A/AB linear design for all modulations & industry standards. Covers 6.0-18.0 GHz, produces >300 W with a minimum 55 dB gain. Excellent flatness, optional monitoring parameters for Forward/Reflected power, VSWR, voltage, current & temperature sensing for superb-reliability. Exodus Quiet-Cool technology in our compact 8U-chassis...

The APS-42 Radar

The APS-42 Radar, April 1948 Radio News - RF CafeThe APS−42, as described in this 1948 issue of Radio News magazine, was truly a break-through x−band airborne search radar system born out of the lessons learned from its predecessor: the APS−10 search radar developed during World War II. This very compact radar system is contained within a volume of about 3 feet on a side (not including the cockpit controls and displays. The close proximity of the receiver front-end to the antenna made for a very low noise figure and, consequently, high sensitivity. Interestingly, there is not a whole lot of information available on the Internet for either radar. In fact, this article is probably the most information source available on the APS−42...

Wall Posters by AR RF/Microwave Instrumentation

Wall Posters by AR RF/Microwave Instrumentation - RF Cafe Cool ProductAs of this writing, AR RF/Microwave Instrumentation is now offering a few wall posters designs at no charge. Among the themes are "RF and EMC Formulas and Charts," "Mathematical Tools of the Trade," and "Radiated And Conducted Immunity Test Requirements & Solutions." Posters by AR RF/Microwave Instrumentation Wall posters used to be a common sight decorating engineering labs and engineers' and technicians' cubicles, but since the smartphone boom began, fewer and fewer of them have been made available. Even with apps for just about every imaginable topic available literally at your fingertips, sometimes it is handy to look at a large size printed chart for quick reference. If you would like one of these posters you had better put in your request now because they could be gone at any time...

TV DX in Radio-Electronics

TV DX, July 1958 Radio-Electronics - RF CafeHobbyists in the technical realm have in many ways contributed mightily to the advancement of professional scientific knowledge and practice. This is partly because many hobbyists are also career technologists, but the majority are tinkerers, experimenters and otherwise participants who come from all walks of life geographically, economically, professionally, and socially. Just as with university and corporate laboratories, some of the discoveries are the result of structured, preconceived plans of action and designs of experiments with certain goals in mind; many, however, are due to serendipitous events that are recognized by their participants as being significant. Such is the case of "TV DX" as related in this 1958 Radio-Electronics magazine story. TV DX is the use of unique opportunities in the atmosphere's ionization state to facilitate signal transmission and reception at distance much greater than normally experienced. Data collected by amateurs were, during the era of over-the-air VHF and VHF television broadcasting, included in studies and theories created by professional scientists and engineers to help better understand and predict communications phenomena - both for exploitation and for interference avoidance. The same is true today for other areas...

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.

   

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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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