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Homepage Archive - May 2021 (page 4)

See Page 1 | 2 | 3 | 4 of the May 2021 homepage archives.

Monday the 31st

RF Cafe Visitor Dave H. Awarded Patent for "One Pad Communications"

Apropos for today's Day in History theme of Congress' passing of the U.S. Copyright Act on May 31, 1790, is RF Cafe visitor Dave Hutchinson's notifying me of his recent patent (US10708043B2), award for his invention entitled "One pad communications." Abstract: Perfect secrecy can only be assumed if the length of the key is as long the message sent and the cardinality of the key space is the same as that of the message. The preferred embodiment will demonstrate how to implement a one-pad communication system between a transmitter and a receiver where only a few parameters need to be transferred to the receiver. The preferred embodiment will also demonstrate that a true random number will be generated and used...

Exodus Intros 18.0-26.5 GHz, 10 W P1dB Amplifier

Exodus Advanced Communications Intros 18.0-26.5 GHz, 10 Watt P1dB Amplifier - RF CafeExodus Advanced Communications, a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide, introduces their AMP4032A high power amplifier. The AMP4032A is an ideal broadband EMC-lab amplifier also for EW, communications and all applications. Class A/AB linear design for all modulations and industry standards, a great TWT replacement. Covers 18.0 – 26.5 GHz, 10 W P1dB (15W typical), with 40 dB of gain. Optional monitoring parameters for forward/reflected power, voltage, current & temperature sensing for superb reliability and ruggedness in our compact 3U chassis...

B-52 Bomber Navigation System

B-52 Bomber Navigation System, February 1957 Radio & Television News - RF CafeThe Boeing B-52 Stratofortress long-range bomber has been in continuous service since 1954. Production of new aircraft ran from 1952 through 1962. Now 67 years hence at version "H," it is still our nation's primary long-range bomber. That is a great testimony to the aircraft's initial design and construction, but a sad testimony to our ability to design and build a complete replacement. The B-1 bomber was a dismal failure and the B-2 Stealth bomber is too expensive to build and maintain in large quantities. This story from a 1957 edition of Radio & Television News reports on the "K-System" computerized bombsight gear installed in early B-52s that used radar for targeting. According to the writer, nearly 1,000,000 American defense company workers at companies like Eastman Kodak, General Motors, General Mills (yes, the breakfast cereal people), Motorola, and roughly 3,000 others...

NuWaves Looking for an Applications Engineer

Applications Engineer, RF Products Needed by NuWaves Engineering - RF CafeNuWaves Engineering, located in Middletown, Ohio, is in need of an Applications Engineer for their RF products line. This position presents the opportunity to apply expertise in Applications Engineering to support NuWaves' primarily radio frequency products, ultimately supporting the U.S. Military. Opportunities exist within the Product Advancement domain and across the company to increase knowledge, grow leadership skills, and continuously improve the business system. The Applications Engineer is responsible for understanding the functionality, application and internal circuitry of all NuWaves' products. An individual that is successful in this position will work to find innovative solutions to improve manufacturability, lower costs, and create additional value for the customer. Working closely with the Product Advancement and Business Development teams, the Applications Engineer provides in-depth technical support to customers...

Heathkit Lovers Take Note!

The History of Heathkit Zoon call - RF CafeMark your calendar! Tuesday, June 1, at 8 pm EDT, a Special Open Zoom Presentation titled: "The History of Heathkit," including the inside story of Facts, Fables and Stories ... the unvarnished truth ... from the inside. Presented by Ed Shekleton, K1ZE, who was Heathkit Technical Manager based in New England from 1972 to 1990. There will be plenty of time to ask your questions and an opportunity to tell of your Heathkit experiences. All are invited.... please pass this message along to the hams and clubs you know that may enjoy the insider Heathkit Story. Check out the Heathkit website. Thanks to Joe Birsa, N3TTE, for letting me know.

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 30th

Physics Theme Crossword Puzzle for May 30th

Physics Theme Crossword Puzzle for May 30th, 2021 - RF CafeFor twenty years now, I have been creating weekly crossword puzzles for the education and enjoyment of the technically minded visitor like you. This Physics Theme Crossword Puzzle for May 30th has many words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

Thanks to PCB Directory for Continued Support!

PCB  Directory - RF CafePCB Directory is the largest directory of Printed Circuit Board (PCB) Manufacturers, Assembly houses, and Design Services on the Internet. We have listed the leading printed circuit board manufacturers around the world and made them searchable by their capabilities - Number of laminates used, Board thicknesses supported, Number of layers supported, Types of substrates (FR-4, Rogers, flexible, rigid), Geographical location (U.S., China), kinds of services (manufacturing, fabrication, assembly, prototype), and more. Fast turn-around on quotations for PCB fabrication and assembly.

Friday the 28th

Electric Space Ships - Part 1

Electric Space Ships Part 1, December 1950 Radio-Electronics - RF CafeFor some inexplicable reason, the first page of Part 1 of the "Electric Space Ships" articles in Radio-Electronics magazine is nowhere to be found. It is missing from the scanned copy, so I am attempting to get a hard copy on eBay (December 1950 issue). Until then, here is what is available from the PDF version on the WorldRadioHistory website (I normally only use my own purchased hard copies). One RF Cafe visitor wrote when I originally posted Part 2 that he has searched in vain for the missing portion of Part 1 and thinks there might be some kind of conspiracy to hide the information - part of the ET/UFO cover-up. Maybe the government has gone around and ripped page 32 from every issue of the magazine ;-) Otherwise, note in Figure 2 the "electric wind" affecting the candle flame. This flame-related phenomenon is likely the principle which Lee deForest exploited in his early radio signal detectors which, eventually, led to his Audion invention...

Thanks Again for RIGOL Technologies' Continued Support!

RIGOL Technologies (electronics test equipment)RIGOL Technologies is transforming the Test and Measurement Industry. Our premium line of products includes digital and mixed signal oscilloscopes, spectrum analyzers, function / arbitrary waveform generators, programmable power supplies and loads, digital multimeters, data acquisition systems, and application software. Our test solutions combine uncompromised product performance, quality, and advanced product features; all delivered at extremely attractive price points. This combination provides our customers with unprecedented value for their investment, reduces their overall cost of test, and helps speed time to completion of their designs or projects.

Super-X Divertor Increase Viability of Nuclear Fusion

Super-X Divertor Increase Viability of Nuclear Fusion - RF Cafe"Initial results from UK Atomic Energy Authority (UKAEA)'s new 'MAST Upgrade' experiment at Culham have demonstrated the effectiveness of the so-called Super-X divertor, an exhaust system that will allow components in future commercial tokamaks to last longer and bring costs down. Inside a tokamak fusion reactor, light atomic nuclei are fused together to form larger ones, releasing a huge amount of energy in the process. This is achieved by confining plasma within a magnetic field and then heating it to temperatures of around 150 million degrees Celsius. The hot fusion plasma exhaust is then passed through a divertor to allow it to dissipate some of this excess heat..."

Adoption of TV Standards Paves Way for Commercial Service

Adoption of Television Standards Paves Way for Commercial Service, August September 1941 National Radio News - RF CafeThis story from a 1941 edition of National Radio News reports on the FCC's having passed regulations to allow the rollout of commercial television service as of July 1, 1941. These standards, observes the Commission, "represent, with but few exceptions, the undivided engineering opinion of the industry." They "satisfy the requirement for advancing television to a high level of efficiency within presently known developments." Furthermore, "Frequency modulation is required for the sound accompanying the pictures. Thus, television is now benefited by the recent developments of frequency modulation." It was an era of wonder and excitement in the world of wireless communications...

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.

Thursday the 27th

Patent Information for the Inventor - Part 2

Patent Information for the Inventor Part 2, August 1962 Electronics World - RF CafeThis is Part 2 of Mr. Joseph F. Verruso's "Patent Information for the Inventor" series in Electronics World magazine. In the Part I write-up I included a little historical information on the Patent Office. Searching on the U.S. Patent and Trademark Office (USPTO) website can be less than satisfying - especially since some browsers don't handle the TIFF image files - so you might want to start with Google Patents where you can enter a more verbose search string (and you can display the search results as a page of images). See also "Infringers Beware," July 1966 Popular Electronics, Worldwide Patent & Invention Resources, and RF Cafe Visitors' Patents...

Moving Chips Closer to Cold Qubits

Moving Chips Closer to Cold Qubits - RF Cafe"Conventional electronics join quantum circuits in the deep freeze. Three of the biggest companies making quantum computers today - Google, Intel, and Microsoft - are betting on supercooled devices operating at close to absolute zero. But there's a problem: These cold cathedrals of quantum computing cannot tolerate the extra heat given off by the conventional computing chips that control them. This means the classical and quantum - computing components must be separated, despite their marriage by design. The control chips usually reside at room temperature on top of the quantum-computing stack, while the quantum bits (qubits) remain in the coldest depths of dilution refrigerators. The dilution fridges involve helium-3 and helium-4 isotopes to supercool the environment..."

Electronic Abbreviations Crossword - 1958 Popular Electronics

Electronic Abbreviations Crossword Puzzle, November 1958 Popular Electronics - RF CafeThis crossword puzzle from a 1958 issue of Popular Electronics magazine is a little trickier than some because it uses abbreviations rather than full words. Not everyone uses the same abbreviation, so some answers are a bit more subjective. For instance, many people abbreviate the word 'transformer' as 'xfmr,' while others use 'trans' or 'trr' (I use xfmr). Where you really have to be careful, though, is with evolutional changes in terminology as is the case for frequency units, where 'cps' was most often used in 1958 rather than today's 'Hz." Enjoy.

UK Space Agency Jobs Infographic

UK Space Agency Jobs Infographic - RF Cafe"The UK's Space Agency (UKSA) has highlighted in its latest report that more than 3,000 jobs have been created as the space sector grows across the country. The 'Size and Health of the UK Space Industry 2020' update suggests a growth in both space-related jobs and revenue [see infographic]. Commissioned by the UKSA, it was prepared by know.space, a specialist space economics consultancy. Among its findings were that total UK space industry income grew to £16.4 billion in 2018/19, a growth rate of 2.8% per annum since 2016/17..."

New for 2021! RF & Electronics Stencils for Visio

RF & Electronics stencils for Visio r4 - RF CafeWith more than 1000 custom-built stencils, this has got to be the most comprehensive set of Visio Stencils 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). Stencils 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...

Many Thanks to KR Electronics for Helping Deliver RF Cafe!

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.

Wednesday the 26th

Patent Information for the Inventor

Patent Information for the Inventor Part 1, July 1962 Electronics World - RF CafeNot having ever applied for a patent, I do not know how much of what appeared in this "Patent Information for the Inventor" article from a 1962 issue of Electronics World magazine is still valid. The fundamentals are probably about the same. One thing that has changed since this article was written is the name change in 1975 from the U.S. Patent Office to the U.S. Patent and Trademark Office (USPTO), which occurred when ownership was passed from the Department of the Interior (1849-1925) to the Department of Commerce (1975-present). The schedule of fees has grown to a very complex table of definitions and requirements for various types of patents and services. A Basic Filing Fee runs $320 for big businesses, $160 for smaller concerns ("Small Entity"), and $80 for individuals with no more than four current patents ("Micro Entity). That compares to $25 in 1962 ($220 in 2021 money per BLS). July 31, 1790, the first U.S. patent was issued to Samuel Hopkins for an improvement "...in the making of Pot ash and Pearl ash by a new Apparatus and Process...

EMC Directory - Online Directory of EMC Testing Labs 

EMC Directory - Online Directory of EMC Testing Labs - RF CafeEMC Directory, a new addition to the everythingRF network of engineering resources, is the largest online directory of EMC / EMI Testing labs. The website makes it easy for users to find EMC labs based on their location and testing capabilities. Users can specify the application like Automotive, Radio Technology, Industrial, Medical etc. to find labs that can carry out the test in a specific region. They can also find labs based on the testing directive like CISPR 11, FCC Part 15 (Sub part b) or ISO 10605. EMC testing is performed to ensure that the electronic devices: Have sufficient immunity to electromagnetic interference. They do not create excessive electromagnetic radiation EMC Testing is a very important area for most engineers and companies. Regulatory bodies around the world like FCC, CE, have placed limits on the levels of emissions that electronic and electrical products can generate...

Improving the Receiver Using a Screen-Grid Coupling Stage

Improving the Receiver Using a Screen-Grid Coupling Stage, December 1931 QST - RF CafeIn December of 1931, the discovery of deuterium (aka "heavy water") was announced by Harold Urey, Japan abandoned the gold standard, the New York Metropolitan Opera broadcasted an entire opera over radio for the first time (on Christmas day), and the ARRL's QST magazine published an article about how to improve a receiver by using a screen-grid coupling stage on vacuum tubes. A "tickler coil" is introduced via a tuned circuit to provide a small amount of positive feedback to the grid in order to make the amplifier stage more sensitive in the band of interest. Care needed to be taken to avoid so much feedback that oscillations could occur. As with most of these old articles I post, while the exact application might not be relevant in today's world of electronics, the basic principles are certainly timeless...

RF & Microwave Engineer Needed by NuWaves Engineering

RF & Microwave Engineer Needed by NuWaves Engineering - RF CafeNuWaves Engineering currently has an immediate opening for a RF & Microwave Design Engineer. This position presents the opportunity to apply expertise in RF and Microwave Engineering to support NuWaves' primarily DoD projects, ultimately supporting the U.S. military. Opportunities exist within the Engineering domain and across the company to increase knowledge, grow leadership skills, and continuously improve the business system. 2 to 6 years of experience required in RF and Microwave circuit design. Individuals must have knowledge of RF/MW circuits that include power amplifiers through C-band, RF upconverters and downconverters, RF filters, and low noise amplifiers. The ideal candidate will possess strong technical writing skills...

ConductRF Reformable RF Coaxial Cables at DigiKey

ConductRF Reformable 50 Ω RF Coaxial Cables at Digi-Key - RF CafeConductRF Reformable RF Coaxial Cables are available off the shelf from DigiKey. ConductRF FM series of Hand Formable RF cable assemblies provides system designers with a versatile solution that allows RF cables to be physically routed and set in to position during installation. Standard lengths and connector types feature performance up to 40 GHz. Low loss, tinned braided cable of 0.086" diameter with shielding of >100 dB, precision RF connectors. 100% factory tested for VSWR & insertion loss. RoHS & Reach compliant. Ideal for internal module linking and great for RF Testing. Made in the USA...

May 26th Supermoon Total Eclipse 

May 26th Supermoon Total Eclipse - RF CafeA total lunar eclipse will happen on May 26th, but I won't be able to see it from my [disad]vantage point in Erie, PA. It will coincide whit when the moon is near its closest approach to Earth, so it will appear very large, aka a "supermoon." While the supermoon is usually a good thing for those wishing to view the surface features, it makes for a lousy eclipse because it is in the Earth's shadow (the umbra) for a shorter period of time, making totality shorter - in this case a mere 15 minutes. Oh well, maybe you will get to see it. The longest total lunar eclipse of the 21st century has already occurred, on 7/27/2018 (1h42m57s), and the shortest was 4/4/2015 (4m43s).

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.

Tuesday the 25th

Radio-Electronics Monthly Review

Radio-Electronics Monthly Review, May 1946, Radio-Craft - RF CafeEarth-moon-earth (EME) radio communications was a big deal in the 1940s and up through the early artificial satellite era of the 1960s. The moon is technically a satellite, too, but it is far from ideal for reflecting radio signals. Amongst its negatives is signal attenuation due to extreme distance (225,623 at minimum when directly overhead at the lowest point in orbit - farther when near the horizon), low coefficient of reflectivity (from about 0.03 at 4 cm to 0.1 at 10 m), and it is in constant motion (position tracking and Doppler correction required). Of course that is part of the challenge to today's Amateurs, but EME was considered a desirable option for military strategic communications. 1946 was the year EME really got started, as noted in this 1946 issue of Radio-Craft magazine quip. In other news, RCA president...

RF & Microwave Engineering Technician Sought by NuWaves

RF and Microwave Engineering Technician Sought by NuWaves - RF CafeNuWaves Engineering currently has an immediate opening for a RF & Microwave Engineering Technician. This position presents the opportunity to apply expertise in RF and microwave technology to support NuWaves' primarily DoD projects, ultimately supporting the U.S. military. Opportunities exist within the engineering domain and across the company to increase knowledge, grow leadership skills, and continuously improve the business system. Actively seeking talented and highly motivated RF & Microwave Engineering Technicians. This position is part of the product development team and supports testing and documentation processes in the design of new products, such as, RF/MW power amplifiers, upconverters, downconverters, RF filters, and low noise amplifiers. Individuals in this position take direction from engineers, project managers...

PMI May 2021 Product Announcement

Planar Monolithic Industries (PMI) May 2021 Product Announcement - RF CafePlanar Monolithic Industries (PMI) recently introduced seven - count 'em, 7 - new products in their extensive line of RF and microwave components. Included are a 1-18 GHz Channelized Receiver, a 2.0 to 18.0 GHz Switch-Amplifier, a 0.25 to 18.0 GHz 1P16T switch, a 30 MHz to 40.0 GHz LNA, a 0.5 to 18.0 GHz dual gain amplifier, a 0.1 to 27.0 GHz 5-bit attenuator, a 0.2 to 2.5 GHz SDLVA. Contact PMI today for more information...

Electronics-Themed Comics, June 1951 Radio-Electronics

Electronics-Themed Comics, June 1951 Radio-Electronics - RF CafeWhen looking a these vintage electronics-themed comics from Radio-Electronics magazine (and others), it probably is a case of "you had to have been there" to appreciate the humor in them. In a world of 24/7 broadcasting of every TV channel, the first comic wouldn't even make sense to someone who was born after about 1990, after which time most local over-the-air broadcast stations signed off at 1:00 or so, played the National Anthem, and then displayed a test pattern until about 6:00 am. The second comic is from the era of high voltages inside radio and TV chassis for vacuum tube plates and CRT accelerator grids. That big bulky thing the guy in the last comic is carrying is a thing called a cathode ray tube (CRT), which old people used to use...

3D Directory: Online Directory of 3D Printing Companies

3D Directory: Online Directory of 3D Printing Companies - RF Cafe3D Directory is the Internet's largest directory of 3D Printing companies. The website makes it easy for users to find 3D Printing companies based on their location and printing capabilities. Users can specify the 3D service they need (Printing, Scanning or Design), the material, the technology that they want to use, the industry for which they want to print and much more. 3D Printing is becoming a requirement in a wide range of industries, including the electronic component industry and RF/Microwave industry where antennas and other components are being 3D Printed. The 3d.directory website has listed over 1,000 3D Printing companies who provide 3D Printing services, 3D Scanning Services and 3D Design Services...

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.

Monday the 24th

Carl & Jerry: The Hot Dog Case

Carl & Jerry: The Hot Dog Case, December 1954 Popular Electronics - RF CafeThat's hot dog, not hotdog. In this third installment in the adventures of John T. Frye's much-anticipated monthly exploits of teenage electronics investigators Carl Anderson and Jerry Bishop. In this December 1954 issue of Popular Electronics magazine, pet mutt Bosco has developed a case of hot paw pads. Using a makeshift Geiger counter and a homemade radio homing device, the two boys set out to discover the source of Bosco's warmth. A buried, as-yet undiscovered lode of uranium is high on their suspect list, and visions of untold wealth dance through their heads. Read on to find out what they found out...

Sr. RF Design Engineer Wanted by NuWaves Engineering

Senior Radio Frequency Design Engineer Wanted by NuWaves Engineering - RF CafeNuWaves Engineering currently has an immediate opening for a Senior RF Design Engineer. This senior-level Engineering position requires 15+ years of RF Engineering experience and thus is a subject-matter expert, assisting all RF Engineering efforts at NuWaves. This includes proposal and technical writing, circuit and system-level design, and leadership. The Senior RF Design Engineer also works closely with customers and potential customers on business development efforts. Essential functions include making sound decisions for system approaches and tradeoffs, assisting in improving daily processes to ensure the Engineering Technical Team meets customer requirements, communicating effectively, leading the bid and proposal (B&P) process by providing engineering cost estimates, technical writing...

Many Thanks to Electro-Photonics for Their Continued Support

Electro-PhotonicsElectro-Photonics is a global supplier of RF & Microwave components. Their products include SMT hybrid and directional couplers, wire bondable passive components, mounting tabs, filters, transmission lines, and very useful test boards for evaluating components (spiral inductors, single-layer capacitors). The Electro-Photonics team can support your small R&D design requirements with RF & Microwave test fixtures and save you valuable design and characterization time. Please take a moment to visit Electro-Photonics' website and see how your project might benefit. 

Vintage Heathkit SA-2060A Deluxe Antenna Tuner Kit

Vintage Heathkit SA-2060A Deluxe Antenna Tuner Kit - RF Cafe Cool ProductOccasionally an unbuilt vintage Heathkit item appears on eBay with really nice photos of the contents. Recently, a Heathkit SA-2060A Deluxe Antenna Tuner kit appeared. It tunes the entire 160 to 10 meter range. Dual wattmeters measure forward and reverse power. The guy who listed it says, "These tuners are the apex of the Heathkit tuner kits; I already have a built one and it's my main tuner in the shack. Full legal limit 1500+ watts across the HF bands, roller inductor tuner." This is a manual tuner with lots of mechanical parts as well as electronic parts. Take a look at all the dial and knob extender shafts, standoffs, mounting brackets, and attachment hardware. Wouldn't you love to have something like this to spend a few hours assembling? Per the 1987 Heathkit catalog, the SA-2060A was priced at $269.95 ($639.67 in 2021). That is not too far off the price for a contemporary 2 kW tuner, such as the Palstar AT2K (6 to 160 meters) retailing at $595.99...

New Website: Go Photonics

Go Photonics website - RF CafeA new website named Go Photonics concerned primarily with Lasers, Fiber Optic and Imaging Products has been launched. Its huge searchable database contains the Internet's largest publically available collection of related companies and products. Laser diodes, CMOS image sensors, superluminescent diodes, tunable lasers, spectrometers, DPSS lasers, and nanosecond lasers are examples of what is available. New photonics product announcements and photonics industry news are updated constantly. Add your company to the database at no charge. If you are interested in photonics, be sure to bookmark Go Photonics for quick reference!

Workforce Shortages Worries Rural Carriers

Workforce Shortages Worries Rural Carriers - RF CafeThis headline brings to mind a sign I saw taped to the counter in my local Kentucky Fried Chicken (KFC) restaurant. It stated that the establishment was short-handed because the government was paying people more money to not work than KFC could afford to pay them to work. Many companies are expressing the same lament. Not to worry, though, because soon all the jobs will be filled by the untold number of unvetted, possibly sick, possibly criminally fugitive people crossing our southern border. It reminds me of the 9 most terrifying words in the English language: "I'm from the government and I'm here to help."

Please Thank IPP for Their Long-Time Support!

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

Sunday the 23rd

Science Theme Crossword Puzzle for May 23rd

Science Theme Crossword Puzzle for May 23rd, 2021 - RF CafeFor twenty years now, I have been creating weekly crossword puzzles for the education and enjoyment of the technically minded visitor like you. This Science Theme Crossword Puzzle for May 23rd has many words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!


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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Copyright: 1996 - 2024


    Kirt Blattenberger,


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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