Search:                        
Please support my efforts by ADVERTISING!
Serving a Pleasing Blend of Yesterday, Today, and Tomorrow™

Vintage Magazines

Electronics World
Popular Electronics
Radio & TV News
QST | Pop Science
Popular Mechanics
Radio-Craft
Radio-Electronics
Short Wave Craft
Electronics | OFA
Saturday Eve Post
Electronics Illustrated

Formulas | Data

Electronics | RF
Mathematics
Mechanics
Physics


Calvin & Phineas

Archive | Sitemap
kmblatt83@aol.com

Resources

Radar | AI
Cogitations
RF Museum
Videos | Pics |
Things | Logos
Radio Datashts
WJ Tech Notes
Day in History

Entertainment

Crosswords
Humor | Podcasts
Quotes | Quizzes
Tech Comics

Parts | Services

1000s of Listings


About RF Cafe

Software: RF Cascade Workbook | RF Symbols for Office | RF Symbols & Stencils for Visio | Espresso Workbook
ConductRF Precision RF Test Cables MAESTRO - RF Cafe Website

RF Cafe Quiz: Ohm's Law

Quiz #90: Ohm's Law - RF Cafe WebsiteOhm's Law is the bedrock of electrical engineering. Formulated by Georg Simon Ohm in 1827, it establishes the fundamental linear relationship between voltage (V), current (I), and resistance (R) in an ideal conductor. This simple yet profound equation -- V = IR -- allows engineers to predict circuit behavior, design voltage dividers, calculate power dissipation, and troubleshoot complex systems with ease. While it holds true for most metallic conductors under constant temperature, real-world circuits often involve non-linear components and temperature-dependent materials where the law must be applied with nuance. This Ohm's Law Quiz covers the core mathematical relationships, units of...

On the Very Highs

On the Very Highs, July 1944 QST - RF Cafe Website"Our first complete column devoted to the subject [of v.h.f. and u.h.f. signal variation], presenting material similar to that which follows, was withheld from publication at that time in compliance with censorship." That is an amazing statement from a time when almost any form of technical information that was not already public knowledge was withheld for the sake of the war effort. Nothing that might even remotely give the enemy an edge, and consequently possibly harm our troops, got past the government censors at the War Department. Most citizens and even media editors willingly complied. Compare that with today's 5th column traitors at most of the media outlets that not only can't wait...

Early Digi-Key Advertisement

Digi-Key Advertisement, July 1974 Popular Electronics - RF Cafe WebsiteWaaaay back in the mid-1980s when I first became aware of Digi-Key, it was one of the relatively few electronics component suppliers that had a large on-hand stock of commonly used parts and provided fast shipping. Places like Newark Electronics and Allied Electronics also provided good service, but Digi-Key usually offered lower prices than the others. By the 1990s, I was placing orders at least weekly during circuit design projects. Digi-Key was founded in 1972 in Thief River Falls, Minnesota - the town that for many years often had the country's lowest recorded daily temperature. This 1/4-page advertisement appeared near the back of a 1974 issue of Popular Electronics magazine...

SimSmith / SimNEC Software

SimSmith Smith Chart Software - RF Cafe Cool ProductRandy Rogers, AD7ZU, mentioned in the May 2020 issue of QST magazine the Smith Chart software called "SimSmith," by Ward Harriman, AE6TY. SimSmith first appeared around 2011. Being written in Java, it will run on any operating system that supports Java. Recent versions incorporate Numerical Electromagnetics Code (NEC) code and bear the name "SimNEC." At present, several versions of SimSmith/SimNEC are available. If you are following a video and want to use the SimSmith release closest to that used in the video, look at the top of the screen to see the version of SimSmith being used and then choose between older versions. If you new to the software, he strongly...

The Maser & Sugar Scoop Antenna: Receiver for Signals from Space

The Maser & Sugar Scoop Antenna: Receiver for Signals from Space, November 1960 Electronics World - RF Cafe WebsiteWhen really good researchers set out to write books on history, they do not simply cull information from the publications of fellow contemporary authors; instead, they look for sources that were published during or around the time of the subject being covered. Doing so helps minimize the possibility that inaccuracies have crept into the knowledge pool and that information other authors might have either deemed insignificant or have missed can be recovered. That is part of my motivation for going to the trouble of buying these vintage magazines and posting articles like this one which reports on early maser developments. It delves fairly deeply into the solid state physics of rare earth...

Please Thank Werbel Microwave for Continued Support!

Werbel Microwave Passive RF Components - RF Cafe WebsiteWerbel Microwave is a manufacturer of RF directional and bidirectional couplers (6 dB to 50 dB) and RF power dividers / combiners (2- to 16-way) with select models operating up to 26.5 GHz and 100 W of CW power (3 kW peak). All are RoHS and REACH compliant and are designed and manufactured in our Whippany, NJ, location. Custom products and private label service available. Please take a couple minutes to visit their website and see how Werbel Microwave can help you today.

RF Cafe Quiz: Electromagnetism

Quiz #91: Electromagnetism - RF Cafe WebsiteElectromagnetism is the force that governs the behavior of charged particles and the propagation of electromagnetic waves, forming the physical basis for nearly all modern electronic and wireless communication systems. From the fundamental observations of Oersted and Ampere to the elegant synthesis of Maxwell's equations, the field describes the inseparable relationship between electric and magnetic fields. Whether it is the Lorentz force propelling an electron beam in a vacuum tube, the induction driving a power transformer, or the alternating fields that carry radio signals across the globe, electromagnetism is ubiquitous. This Electromagnetism Quiz explores the core concepts of this discipline...

Entertaining Uncle Oscar

Entertaining Uncle Oscar, August 1939 QST - RFCafePopular comic strips (aka "funnies") in the 1930s and 1940s featured numbskulls, ne'er-do-wells, and simpletons. There was usually one character in the strip's cast that was smart - at least in a relative way if not absolute. Being familiar with some of the old comics like Blondie, Barney Google, Krazy Kat, Beetle Bailey, Gasoline Alley, etc., I can see a definite relationship between the story line of "Entertaining Uncle Oscar" and the comics of the era in this short story that appeared in a 1939 edition of the ARRL's QST magazine. As you might guess, the feller named "Ham" is the smart one. Q: Is it irony, coincidence, or premonition on the author's part that the uncle's name is the same as...

Quartz Crystal Etching

Quartz Crystal Etching, May 1954 Radio & Television News - RF Cafe WebsiteIf you are going to write an article about etching crystals for radio frequency circuits, having a last name like Gene Brizendine's couldn't be much better. It just sounds like a mineral or a compound (benzidine, etc.). Amateur radio operators have for a long time adjusted the resonant frequency of their crystals by either grinding or chemical etching. Mr. Brizendine recommends etching as a more controllable method that does not reduce the quality of the crystal like improper grinding can do. Ammonium bifluoride is mentioned as the etchant. It is said to have cost about $1/pound in 1954, and sells on Amazon today for about $23/pound. According to the BLS Inflation Calculator, $1 in 1954...

Engineering & Science Crossword Puzzle

Engineering & Science Crossword Puzzle April 12, 2020 - RF Cafe WebsiteWorking crossword puzzles can be contagious. This April 12, 2020, tech-themed crossword puzzle may even go viral - the second in a series. It contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc., which I have personally built over nearly two decades. That includes the cause for our planet's current dilemma. Many new words and company names have been added that had not even been created when I started in the year 2002. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr...

Please Thank Werbel Microwave for Continued Support!

Werbel Microwave Passive RF Components - RF Cafe WebsiteWerbel Microwave is a manufacturer of RF directional and bidirectional couplers (6 dB to 50 dB) and RF power dividers / combiners (2- to 16-way) with select models operating up to 26.5 GHz and 100 W of CW power (3 kW peak). All are RoHS and REACH compliant and are designed and manufactured in our Whippany, NJ, location. Custom products and private label service available. Please take a couple minutes to visit their website and see how Werbel Microwave can help you today.

RF Cafe Transformer Quiz

Quiz #89: Transformers - RF Cafe WebsiteTransformers are the workhorses of power distribution and signal processing, utilizing Faraday's law of induction to step voltages up or down while maintaining high efficiency. By coupling magnetic fields between primary and secondary windings through a shared core, they provide critical electrical isolation and impedance transformation between circuit stages. From massive grid-scale power units to tiny high-frequency RF baluns, transformers must manage complex phenomena such as magnetizing current, eddy current losses, hysteresis, and parasitic leakage inductance. This quiz explores the core physics behind transformer operation, including the “turns ratio” relationship, the role of core...

Radio-Electronics Monthly Review

Radio-Electronics Monthly Review, May 1947 Radio-Craft - RF Cafe WebsiteA column entitled "Radio-Electronics Monthly Review" appeared in each issue of Radio-Craft magazine. As now, things were moving quickly at the time. With WWWII recently ended, a lot of the new technology developed to help beat back Nazism and Communism was being transferred to peacetime uses. The May 1947 issue contained, amongst other items, info regarding how radio servicemen were organizing efforts to get its ranks educated on FM sets as AM was being replaced and/or supplemented with the new miracle noise-free broadcast systems. It also reported that the IRS decided not to go forward with earlier plans to tax television shows being displayed in public...

How Radio-Control Systems Work

How Radio-Control Systems Work, May 1974 Popular Electronics - RF Cafe WebsiteRadio control (R/C) systems operating in the 2.4 GHz ISM band, using one of or a combination of frequency hopping and direct sequence spread spectrum scheme, have been in widespread use since the early 2000s. As with any new technology, there was a lot of reluctance to adoption of the systems based on a few reports (valid or not) of performance issues - primarily lack of control range where communications between the transmitter (Tx) and receiver (Rx) with a pilot and aircraft was lost and a crash ensued. Tx power was already at the FCC-mandated maximum, so manufacturers quickly improved receivers by adding diversity with a second Rx antenna. The receiver...

Laser Modulators

Laser Modulators, April 1967 Electronics World - RF Cafe WebsiteAs reported in this 1967 Electronics World magazine piece, lasers were still the things of science fiction to most people. Real-world applications seemed to be far off in the future, but in fact, work was underway setting the stage for today's blazingly fast communications systems. The author here references attaining 5 THz optical transmission speeds through fiber and through the air. At the time, a laboratory filled with bulky prototypes chassis and optical tables were required to get those results. I can remember reading articles in the 1970s when laser power output was measured in "Gillette power," referring to the beam's ability to burn through a number of razor blades (a big deal...

U.S. Television Stations and Network Links Map

U.S. Television Stations and Network Links Map, May 1952 Radio & Television News - RF Cafe WebsiteIf my counting is correct, by 1952 only 33 of America's 48 states (Hawaii and Alaska weren't admitted until 1959), and Washington, D.C., had television broadcasting stations. That most of the early television experimentation occurred on the east coast is apparent by looking at the number of stations there compared to the west coast. You might think California would have the largest amount of TV stations, but it only had 11 located in 3 cities. New York, on the other hand, had 13 in 7 cities. Ohio had 12 stations in 5 cities, and Pennsylvania had 7 stations in 5 cities, one of which was my town of Erie. Vermont, New Hampshire, Mississippi, Wyoming, both Dakota, and Oregon were among...

Microwave Klystron Oscillators

Microwave Klystron Oscillators, May 1952 Radio & Television News - RF Cafe WebsiteBy now, engineers and scientists have managed to replace most vacuum tubes with solid state devices - at least for consumer products. The one place tubes remain are in microwave oven. Those klystron tubes operate in the 2.4 GHz band and typically output ranging from about 500 W to 2 kW. No doubt materials and methods have changed since the 1950s, but fundamentally klystrons of today are the same as klystrons then. Between this article and Part 1 that appeared in the April 1952 issue of Radio & Television News magazine, authors Joseph Racker and Lawrence Perenic provide a very nice introduction on the topic. According to the Wikipedia entry, the name "klystron"...

Planning Integrated Signal Communications

Planning Integrated Signal Communications, December 1950 Radio & Television News - RF Cafe WebsiteThe U.S. Army's Signal Corps was set up to "exercise supervision over signal communications literally from the Pentagon to the foxhole." Created in 1860 at the suggestion of a military doctor, the Signal Corps originally used a system of flag waving for messaging dubbed "wigwag" and graduated to overseeing the nationwide telegraph network six years later. By 1870, members were tasked with establishing and operating a weather forecasting service, so in 1907 when they created an aeronautical division it was just in time for facilitating the nation's rapidly growing cadre of aircraft pioneers by providing en route weather information. Having already mastered the state...

de Forest's Syncro-Graphic Training Ad

de Forest's Syncro-Graphic Training Ad, September 1945, Radio-Craft - RF Cafe WebsiteI have never seen study-at-home audio-visual (AV) physics courses offered by Albert Einstein or AV courses on chemistry promoted by Ernest Rutherford, but I can now say I have seen study-at-home AV courses offered by electronics pioneer Lee de Forest. This full-page advertisement for the de Forest's Training, Inc., company of Chicago, Illinois, appeared in a 1945 edition of Radio-Craft magazine. The vaunted (at least by the company) "Syncro-Graphic" training was an early attempt at the paperless classroom. The student watched films reels of instruction rather than "frequent flipping of pages to refer back or ahead to illustrations mentioned in text." It would be another 50 years before...

Medical Electronic Equipment and Hospital Safety

Medical Electronic Equipment and Hospital Safety, January 1972 Popular Electronics - RF Cafe WebsiteThe history of electrical current is replete with tragic incidences of maiming and death caused by ignorance and/or inattention to known danger. Having been involved in both the electrical wiring and the electronics fields since the 1970s, I am quite aware of the legion of hazards present when current flows. My tool box contains screwdrivers and lineman's pliers with notches of melted metal from inadvertent contact between differences of potential in circuit breaker panels and electrical wall boxes. Once you experience the thrill of a sudden blinding flash, unique buzzing sound, and smell of burning hot steel, you'll never forget it. A lot of people have been electrocuted, though, through no fault...

Today in Science History - RF Cafe Website
Loading history...

Homepage Archives - RF Cafe

The RF Cafe Homepage Archive is a comprehensive collection of every item appearing daily on this website since 2008 - and many from earlier years. Many thousands of pages of unique content have been added since then.

 

Come Aboard, OM! Radio Amateurs and the New Naval Reserve

Come Aboard, OM! Radio Amateurs and the New Naval Reserve, October 1947 QST - RF Cafe WebsiteElectronic warfare (EW) is a familiar term today, but in 1947 its use was a relatively new concept. As you know, great advancements in electronics occurred during the War years - from all the major Allied and Axis countries involved. Transmitters and receivers, modulation techniques, antenna designs, transmission lines, component introductions and improvements, ruggedness and portability features (packaging), reliability, serviceability, operational techniques, and other aspects of electronics benefitted from that oft-credited "mother of invention" named "necessity." Along with electronic communication improvements came the need to thwart the enemy's efforts to...

Howard W. Sams Photofact Service Manuals

Howard W. Sams & Co., Inc. Photofact Service Manuals, April 1948 Radio News - RF Cafe WebsiteAccording to this promotion in a 1948 issue of Radio News magazine, the Howard W. Sams company had published more than 5,500 Photofact service data packs since beginning in 1938 - that's averaging 550 per year. There would have been many more if not for the cessation of domestic radio production during the war years from 1942 through the middle of 1945. Once televisions were being cranked out in huge numbers in the early 1950's, the number of data packets quickly grew into the tens of thousands (including also phonographs, tape recorders, and other electronics wonders for the home. In fact, by September of 1949 the magazine's title was...

New Transmitter for Amateur Radio

New Transmitter for Amateur Radio, November 1946 Radio News - RF Cafe WebsiteHams like members of the Mogollon Rim Collins Collectors Club (K0CXX)*, play an important role in the preservation of vintage radio equipment. They own a nice example of a Collins model 30K-5 medium power (250 W) AM transmitter that is the subject of this 1946 article in Radio News. At 5½ feet tall and weighing 350 pounds, the 30K is many times the volume and weight of a modern solid state transmitter (transceiver + PA) having the same capability. Its advertised price in 1946 was $1,450, which is equivalent to $19.9k in 2022 money - obviously not in the affordability range of your typical amateur radio enthusiast...

A New Tool for the Serviceman

A New Tool for the Serviceman, March 1930 Radio News - RF Cafe WebsiteYou are taught early in your electronics career to be mindful of the tendency for measurement equipment to affect the circuit it is measuring, and therefore the indicated results. In the case of high frequency circuits, even minute amounts of capacitance and/or inductance can render results utterly unusable, but even in circuits operating down to D.C. the simple internal resistance of a meter can profoundly affect measurement accuracy. High impedance circuits are particularly vulnerable to such "loading" effects by test equipment. For example, consider a circuit being measured (device under test, aka DUT) that has an impedance of 10 kΩ and the...

Independence Day Theme Crossword Puzzle for July 4th

Independence Day Theme Crossword Puzzle for July 4th, 2022 - RF Cafe WebsiteIn these times of communists and Marxists (and other "-ists") infiltrating high positions of American government and destroying our hard-won legacy of freedom, compassion, traditional family values, hard work, and patriotism, this Independence Day theme crossword puzzle is created to celebrate our heritage and resist the corrupters. The Cancel Culture mobs will never dissuade our staff (Melanie and me) here at RF Cafe! Clues with an asterisk (*) are related to the puzzle's theme. All crossword puzzles use a personally built dictionary of thousands of words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics...

Bell Telephone Labs: Battle of Atoms

Bell Telephone Laboratories: Battle of Atoms, April 1948 Radio News - RF Cafe WebsiteLife is a constant battle on all fronts, be it in health, personal relationships, business, medicine, careers, education, technology, or any other realm. Scientists, engineers, and technicians at the former Bell Telephone Laboratories are affected by that maxim as well as any group of people. The company, known to many as Bell Labs, invested a huge amount of funds and personnel effort into fighting the problems while constantly cropped up both during research and development and which servicing their massive installed base of equipment and transmission lines. Bell Labs regularly ran full-page ads in magazines (including technical and others like Life, The Saturday Evening...

New Selenium Rectifiers for Home Receivers

New Selenium Rectifiers for Home Receivers, November 1946 Radio News - RF Cafe WebsiteSelenium rectifiers were the first widely used replacements for vacuum tubes in commercial electronic equipment. Since amplification was not possible - that came in late 1948 with the invention of the transistor, compliments of Shockley, Brattain and Bardeen - diode action in AC-DC power supplies was its primary application. Typical reverse breakdown voltage is in the neighborhood of 20 volts and current handling capability depends on the interface surface area. Cost kept the selenium rectifiers from being widely adapted early in their history (1933), but by 1946 when this article was published in Radio-News magazine it had dropped enough to make..

Mac's Radio Service Shop: Mac Quotes Benjamin Franklin

Mac's Radio Service Shop: Mac Quotes Benjamin Franklin, October 1949 Radio & Television News - RF Cafe WebsiteWell I'll be darned, old Mac the master radio repairman taught me something else new in this October 1949 issue of Radio & Television News magazine. Along with giving sidekick and trusted technician Barney a lesson on business ethics and how honest dealing can pay dividends as societal conditions change, he also put on his Sherlock Holmes cap and deduced a surprising cause for circuit failure based on the physical location of a lady's radio; read on to learn the details. As usual, the exact scenarios of the stories do not apply to today's environment and/or equipment, but the troubleshooting logic certainly does. And, as usual, the time of year wherein...

Radio-Radar-Sonar in Naval Applications

Radio-Radar-Sonar in Naval Applications, April 1951 Radio & Television News - RF Cafe WebsiteWorld War II was the "necessity" that elicited the "mother of invention" activity responsible for many huge leaps in technology - not the least of which was electronic verbal and non-verbal communications. By 1951, when this Radio & Television News magazine article on the sate of the art of military electronics was published, the United States was already in the midst of another war - this time in Korea - fighting back the frontiers of Communism and despotism. Along with radio and radar, Loran had become a major means of ocean and air navigation. A fair description of the operational details, including timing diagrams, is included in the text...

Audiophile Quiz

Audiophile Quiz, November 1957 Radio-Electronics - RF Cafe WebsiteI could be wrong, but I'm guessing the average audiophile in the 1950s and 1960s were probably more technically astute than modern day audiophiles in terms of electrical and physical specifications. That is largely due to how integrated, matched, and compatible system components (receivers, players, amplifiers, speakers, etc.) are nowadays. Newer audio components are also more tolerant of non-optimal configurations. In 1957 when this Audiophile Quiz appeared in Radio-Electronics magazine, the vast majority of electronics equipment used vacuum tubes that used lethally high voltages, so connection and servicing mistakes could be more costly to life, limb..

Mac's Radio Service Shop: Barney Takes on Color

Mac's Radio Service Shop: Barney Takes on Color, February 1955 Radio & Television News - RF Cafe WebsiteAlways the consummate story teller, John T. Frye began his writing career long before his "Carl & Jerry" electronics adventure series that ran monthly for many years in Popular Electronics. His style featured creating a dialog between instructor and student, serviceman and customer, husband and wife, father and son, etc., in order to present an educational experience with back-and-forth inquiry and responses. In the end, the reader learns something about both sides of the situation. In this February 1955 story, electronics service shop owner Mac McGregor reassures technician Barney Jameson that given time and patience, he will grasp the circuit concepts...

Introducing the Laser

Introducing the Laser, February 1961 Popular Electronics - RF Cafe WebsiteHere is a really good introduction to the way a laser works. In this 1961 Popular Electronics article, author Ken Gilmore discusses a couple Bell Telephone scientists who pioneered long distance laser communications back in 1960. Their experiments began with rather large chemical lasers on the rooftops of buildings separated by 25 miles. Back in the day, most people - including technical types - had never read or heard a description of how a laser works, so this was a brand new concept. Lasers were a science fiction thing used as weapons for battling aliens. We've come a long way since then, with laser communications now taking place within...

Inside the Hi-Fi Tone Arm

Inside the Hi-Fi Tone Arm, February 1960 Popular Electronics - RF Cafe WebsiteEven in the year 2022, there is a huge cadre of turntable aficionados out there whose players can only be taken from them by prying them from their, cold, dead hands. Look at all the buying and selling of turntables that takes place on eBay if you have any doubt (the search I just did turned up more than 800 items). I remember in my U.S. Air Force days, the only time ever lived in mass group quarters (no college dorms for me), guys were in heated competition against each other over who could accumulate the most extensive and expensive hi-fi gear. A large percentage in my barracks were mobile communications types, and they seemed to spend about as...

Kadette Jewel 3-Tube Ultra-Midget Receivers

Kadette Jewel Model 40 Chassis 3-Tube Ultra-Midget Receivers Models 41, 43, 44 and 48 Radio Service Data Sheet, July 1936 Radio-Craft - RF Cafe WebsiteFor many years I have been scanning and posting schematics & parts lists like this one from a 1936 issue of Radio-Craft magazine. It features the Kadette Jewel Model 40 Chassis 3-Tube Ultra-Midget Receivers Model 41, 43, 44 and 48 radios in graphical format. It is able to be "miniature" because only three vacuum tubes are used - although a 12A7 diode / tetrode effectively makes it a 4-tube radio. I'm guessing the Kadette Midget might have only worked well in strong signal areas. Often times I run OCR on them to separate the textual content. The radio shown in the thumbnail is currently being offered for sale on eBay†; the price seems a bit steep. The case...

Mac's Radio Service Shop: Mac Hires a Helper

Mac's Radio Service Shop: Mac Hires a Helper, April 1948 Radio News - RF Cafe WebsiteI believe this is the very first episode of the highly popular "Mac's Radio Service Shop." This series of instructive stories was the brainchild of none other than John T. Frye, creator of the Carl and Jerry series that ran in Popular Electronics for many years. "Mac's Radio Service Shop" began life in April 1948 in Radio News magazine (which later became Radio & Television News, then Electronics World), and changed its name to simply "Mac's Service Shop" until the final episode was published in a 1977 Popular Electronics magazine. "Mac" is electronics repair shop owner Mac McGregor, and Barney Jameson his his eager, if not somewhat naive, technician...

Anritsu MA25211A P25 Radio Auto Test & Alignment System - RF Cafe Website
Please Support My Advertisers!
 
Aegis Power | Centric RF | RFCT
Empower RF | Reactel | SF Circuits

Alliance Test | Isotec
Tennode RF Connectors and Cables - RF Cafe Website

Werbel Microwave power dividers, couplers - RF Cafe Website

Temwell RF Components - RF Cafe Website
Transcat | Axiom Rental Equipment - RF Cafe Website

Windfreak Technologies Frequency Synthesizers - RF Cafe Website

Innovative Power Products (IPP) 90 deg Hybrid Couplers - RF Cafe Website

Please Support RF Cafe by purchasing my ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

These Are Available for Free

Wireless System Workbook™

Espresso Engineering Workbook™

Smith Chart™ for Excel