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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Homepage Archive - November 2020 (page 4)

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.

Homepage Archive Pages

2021:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2020:
  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2019:
  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2018:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2017:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2016:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2015:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2014:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2013:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2012:  1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13


See Page 1 | 2 | 3 | 4 | 5 of the November 2020 homepage archives.
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Monday 30

Your Receiver as an Audio Generator

Your Receiver as an Audio Generator, December 1955 Radio-Electronics - RF CafeI swear when I perused the December 1955 issue of Radio-Electronics there was a good reason that I tagged this "Your Receiver as an Audio Generator" article for posting, but I'll be danged if the motivation for it is obvious now. There's nothing undeserving about the subject from the perspective of a reader back in the day when test equipment could be hard and/or expensive to come by. In fact, as with many of the articles selected this one demonstrates the old maxim about how necessity is the mother of invention. No less an authority on the value of being able to cobble up test equipment from magazine articles and a box of spare parts than Mac McGregor, proprietor of Mac's Radio Service Shop, promotes the practice as an essential skill. Even if you don't find the article useful, at least there's an electronics-related comic on the page to entertain you.

CRFS RF Spectrum Winter Seminars

CRFS RF Spectrum Winter Seminars - RF Cafe"CRFS has launched a new Winter Webinar Series aimed at maintaining discussions on key RF Spectrum topics. Since the international lockdown began during March, and with the cancellation of sector events, CRFS has provided a virtual stage to educate and support audiences in the security, defense and spectrum monitoring community. Adapting to the 'new normal' has seen diverse audiences from across the globe attend the previous webinars and the CRFS Winter Webinar series will expand on this with a range of new topics. The webinars will explore the growing importance of Electromagnetic Spectrum Operations (EMSO) in military Electromagnetic Battle Management (EMBM), the challenges faced..."

Quantum X-Ray Microscope in Development

Quantum X-Ray Microscope in Development - RF Cafe"Scientists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory have begun building a quantum-enhanced X-ray microscope at the National Synchrotron Light Source II (NSLS-II). This groundbreaking microscope, supported by the Biological and Environmental Research program at DOE's Office of Science, will enable researchers to image biomolecules like never before. NSLS-II is a DOE Office of Science User Facility where researchers use powerful X-rays to 'see' the structural, chemical, and electronic makeup of materials down to the atomic scale. The facility's ultrabright light already enables discoveries in biology, helping researchers uncover the structures of proteins to inform drug design for a variety of diseases - to name just one example..."

Countermeasures for Aerial Drones

Countermeasures for Aerial Drones (Artech House) - RF CafeArtech House today announced the publication of Countermeasures for Aerial Drones by Garik Markarian and Andrew Staniforth. This comprehensive resource explains the development of UAVs, drone threats, counter-UAV systems, and strategies to handle UAVs, focusing on the practical aspects of counter-unmanned aerial vehicle (UAV) systems and technologies. Theory, technical and operational practice with insights from industry and policing are covered, and the full rogue drone threat landscape and counter-drone technologies and systems is explored. The book provides insight into counter-drone strategy, developing effective counter-drone strategies and measures, as well as counter-drone programs and the regulatory frameworks governing the use of drones. An New Release price of $111 is being offered for a limited time...

Thanks for NorthEast RF's Continued Support!

NorthEast RF - RF CafeNorthEast RF's comprehensive antenna testing services include linear | circular polarized antenna measurements and OTA cellular device pre-compliance. Up to 18" diameter and <10 kg weight. Antennas can be rapidly evaluated and optimized using our fast near field spherical system. Test results supplied in data file with pattern viewer software. A picture of the test configuration is included to help aligned axis. Our selection of human head and hand phantoms are ideal for verification of body worn devices. Turnaround time is usually 3-days.

The Walkie-Talkie

The Walkie-Talkie, March 1955 Popular Electronics - RF CafeJust as early cellphones (Motorola's Bag Phone, e.g.) required large carrying cases to contain both the large electronics and the large battery required to operate the phone, some of the first commercially available portable personal radio sets came with shoulder straps. Those that didn't have straps had wheels and a handle. The "walkie-talkie" (originally called "handi-talkies") designs were first seen during World War II and then in Korea. In fact, this 1955 article from Popular Electronics was printed shortly after the end of the conflict in 1953. Don't confuse the radio-based portable field telephones with the ones that had a pair of wires (sometimes thousands of feet of it) that did not need complicated circuitry for over-the-air transmitting and receiving...

Many Thanks to ConductRF for Continued Support!

ConductRF coaxial cables & connectors - RF CafeConductRF is continually innovating and developing new and improved solutions for RF Interconnect needs. See the latest TESTeCON RF Test Cables for labs. ConductRF makes production and test coax cable assemblies for amplitude and phased matched VNA applications as well as standard & precision RF connectors. Over 1,000 solutions for low PIM in-building to choose from in the iBwave component library. They also provide custom coax solutions for applications where some standard just won't do. A partnership with Newark assures fast, reliable access. Please visit ConductRF today to see how they can help your project! 

Sunday 29

Radio & Radar Crossword Puzzle for November 29th

Radio & Radar Crossword Puzzle for November 29, 2020 - RF CafeFor the sake of avid cruciverbalists amongst us, each week I create a new crossword puzzle that has a theme related to engineering, mathematics, chemistry, physics, and other technical words. This November 29th Radio & Radar Crossword Puzzle, as always, contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Hedy Lamarr or the Bikini Atoll). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

Friday 27

National Union "Presentation" Radio Model G-619

Radio Data Sheet 344 National Union "Presentation" Radio Model G-619, February 1947 Radio-Craft - RF CafeNational Union Radio Corporation, located in Orange, New Jersey, had been producing radios since its formation in 1929 when this Radio Service Data Sheet for its Model G−619 "Presentation" tabletop set appeared in a 1947 issue of Radio-Craft magazine. That they survived the Great Depression which began in the year of their founding is a testament the tenacity of its management, design staff, and production workers. This 5-tube radio had a very nice mahogany case with a unique reverse-lettering dial glass plate. A few years ago I posted an advertisement by Union Radio from a 1945 issue of Radio-Craft appealing specifically to women engineers and technicians because of the severe shortage of men available while serving in the armed forces during World War II...

Army Advances Materials for New Low-Profile Antenna

Army Advances Materials for New Low-Profile Antenna - RF Cafe"Army scientists have developed a first-of-its-kind antenna that could change how ground vehicles and airborne systems communicate, transmit, and receive radio frequency communications. The Army matured a manufacturing process using a special class of engineered materials known as metaferrites to make an ultra-thin wideband antenna. The antenna conforms to curved surfaces, making it ideal to integrate in unmanned aircraft systems, rotary wing aircraft, and ground vehicles. Said Dr. Philip Perconti, Deputy Assistant Secretary of the Army for Research and Technology and Chief Scientist for the Army, 'Our technical experts used their knowledge in material properties, modeling, and test and evaluation to further advance these materials..."

Computers Yesterday and Today

Computers Yesterday and Today, February 1960 Popular Electronics - RF Cafe60 years ago, when this article was originally published in Popular Electronics magazine, most computers were constructed either of gears or of vacuum tubes. The Univac in the photo below was a breakthrough for having been built entirely of transistors. Even with its "compact" size compared to is successor the ENIAC, the total computational power and programmability was orders of magnitude less than that of my handheld calculator, whose size is largely dictated not by the volume of the electronic circuits, but by the size of the display and the need for input keys larges enough to press reliably. Doesn't the photo of Pascal's calculator of 1642 look like it could be a modern 19" rack-mount chassis, complete with handles?

Modelithics Releases the COMPLETE+3D Library™ v20.8 for Ansys® HFSS™

Modelithics® Releases the COMPLETE+3D Library™ v20.8 for Ansys® HFSS™ - RF CafeModelithics, is pleased to announce the release of version 20.8 of the COMPLETE+3D Library for use with Ansys HFSS. The library contains over 325 highly scalable Microwave Global Models™ for capacitor, inductor, and resistor families from many popular vendors, plus a collection of nearly 300 Modelithics' 3D geometry models for inductors, capacitors, filters, packages and connectors. This library now represents a total of 22,000 individual components with circuit and/or 3D EM models. Version 20.8 adds nine new part value-, pad-, and substrate scalable models and over eighty new full wave 3D electromagnetic models. New scalable circuit models include new models for AVX's MP01...

Please Thank Centric RF for Their Long-Time Support!

Centric RF microwave components - RF CafeCentric RF is a company offering from stock various RF and Microwave coaxial components, including attenuators, adapters, cable assemblies, terminations, power dividers, and more. We believe in offering high performance parts from stock at a reasonable cost. Frequency ranges of 0-110 GHz at power levels from 0.5-500 watts are available off the shelf. Order today, ship today! Centric RF is currently looking for vendors to partner with them. Please visit Centric RF today.

Thursday 26

New Antenna to Multiply Field

New Antenna to Multiply Field, January 1938 Radio-Craft - RF CafeAmateur radio enthusiasts are very familiar with burying ground radials below the surface (or sometimes just laid on top) in order to increase antenna efficiency by affecting impedance and, more importantly, the radiation pattern. Long distance (DX) operators generally prefer low launch angles over high angle "cloud warmers." Pittsburgh's KDKA, the country's first commercial broadcast radio station, built what would have been the mother of all ground radial arrays for its time - 360 (one every degree), 700-foot copper wires (8 AWG), for a total of a quarter million feet! It was laid using a farm tractor drawing a non-motorized trench cutter that looks like it came straight from the John Deere factory. It also implemented a new type of passive vertical suppressor element array...

RF Filter Market to Grow Steadily to $15B by 2024

RF Filter Market to Grow Steadily to $15B by 2024 - RF Cafe"According to a recent report published by Technavio, the RF Filters Market is poised to grow at a CAGR of over 20% from 2020 to 2024 to reach USD $15.73B. The report offers an up-to-date analysis regarding the current market scenario, the latest trends and drivers, and the overall market environment. According to the report, the market is fragmented, and the degree of fragmentation will remain the same during the forecast period. The increase in product launches, organizational restructuring, M&A, and partnerships help market participants expand their product portfolios, geographic presence, and distribution networks. Skyworks Solutions Inc., STMicroelectronics NV, Tai-Saw Technology Co. Ltd., Taiyo Yuden Co. Ltd., and TDK Corp. are some of the major market participants..."

Thanksgiving Day Crossword Puzzle

Thanksgiving Day Crossword Puzzle for November 26, 2020 - RF CafeHere is a specially-made Thanksgiving Day 2020 crossword puzzle compliments of RF Cafe containing a few specific words commemorating the holiday along with the usual assortment of engineering and science related words and clues. Thanksgiving is celebrated in America each year on the fourth Thursday of November in commemoration of the 1621 feast where the Plymouth colonists and Wampanoag Indians shared a harvest feast. Macy's 91st Thanksgiving Day Parade occurs on the morning of Friday, November 26th and follows a route along Central Park West and 6th Avenue. Interestingly, the parade was cancelled during the World War II years of 1942, 1943, and 1944 in order to conserve much needed raw materials. This year, 2020, it will be a hollow event with no spectators allowed along the parade path...

Many Thanks to MECA Electronics for Their Long-Time Support!

MECA ElectronicsSince 1961, MECA Electronics has designed and manufactured an extensive line of RF & microwave components for in-building, satellite, radar, radio, telemetry, mobile radio, aviation & ATC. Attenuators, directional & hybrid couplers, isolators & circulators, power dividers & combiners, loads, DC blocks, bias-Ts and adapters & cables. MECA has long been the 'backbone' of high performance wired and air-interfaced networks such as in-building applications, satellite communications, radar, radio communications, telemetry applications, mobile radio, aviation & air traffic communications. 

Wednesday 25

Mac's Radio Service Shop: A Sound Conversion

Mac's Radio Service Shop: A Sound Conversion, November 1951 Radio & Television News - RF CafeListen to the RF Cafe Podcast! A November edition of "Mac's Radio Service Shop" is appropriate given today's date, especially since author John T. Frye nearly always had the story's setting coincide with the month in which it appeared in Radio & Television News magazine; the year was 1951. The unspecified dateline is somewhere in the upper Midwest, most likely Indiana. Mac's mention of converting a black-and-white television set to color by installing a "color wheel" really betrays the era. The NTSC (National Television System Committee) had not yet adopted an industry standard for color TV, and the various manufacturers were selling a mix of mechanical, electro-mechanical and all-electronic sets. In 1953, the NTSC settled on a 525-line interlaced scan (only 468 lines are part of the visible scan). Knowing that a better color system would be available soon due to massive public demand, Mac put his efforts into talking customers out of a color conversion...

Triad RF Systems' Stephen Barthelmes Interview by everythingRF

Triad RF Systems' Stephen Barthelmes Interview by everythingRF - RF CafeStephen Barthelmes of Triad RF Systems talks amplified radios, Doherty techniques, SDR, and UAVs with everythingRF. We talk about everything from amplified radios and Doherty techniques to software defined radio (SDR) systems and UAVs in an interview with everythingRF this week. everythingRF: Can you give us a brief history about Triad RF? Stephen Barthelmes: Triad RF was established in 2010 when the idea for the company began. In 2013, Dave, Dean and I got together to begin the development of RF products that were underserved by the market. By bringing the decades of knowledge that we had accumulated together, we implemented solid processes in sales, design and manufacturing that produced products that were cutting edge in performance and cost. We also understood the market pressures for increasing RF power to enhance data transmission while simultaneously improving overall efficiency. We stepped up to that challenge by creating some of the most linear and efficient amplifiers in the market...

3D NAND Hits 176 Layers

3D NAND Hits 176 Layers - RF Cafe"Micron Technology recently unveiled 176-layer, triple-level-cell (TLC), 3D NAND flash memory with a 30% smaller die size that employs a new replacement-gate (RG) NAND technology. The chips offer a 35% read/write latency improvement as well as a 33% increase in transfer rate, which is now 1600 Mtransfers/s. The chips are actually built from a pair of 88-layer stacks. When making a 176-layer stack, the challenge is the difficulty in ensuring uniform construction up and down the stack. The latest chips follow on the heels of the 128-layer device from Micron, which also employed 3D NAND and 64-layer stacks. The challenge that RG NAND addresses..."

Modeling Radiation Patterns of Whip Antennas

Modeling Radiation Patterns of Whip Antennas, January 1967 QST - RFCafeComputer modeling of antenna radiation patterns has evolved from a relatively simple electric field equation that diminishes as the inverse of the distance from the source, to exotic, highly sophisticated numerical methods that account for conducting and dielectric surfaces and volumes. A spreadsheet can be built rather quickly to calculate and graph the free-space azimuth and elevation e-field patterns for a 1/4-wave whip or a dipole antenna using textbook formulas, but building a model for displaying the 3D radiation patterns of a cellphone placed next to a human head, or a UHF radio antenna on top of an aircraft takes some pretty serious computing power. In large part we owe a debt of gratitude to the Ph.D. types who have labored hard to make such tools available to us commoners. As with PCB layout software and circuit simulators, chances of success with a first pass prototype has increased...

Anatech Electronics November 2020 Newsletter

Anatech Electronics November 2020 Newsletter - RF CafeSam Benzacar of Anatech Electronics, an RF and microwave filter company, has published his November newsletter that features his short op−ed entitled "Do You Think 5G is Challenging? Meet 6G!," which delves into what can be expected based on current planning. "Like its predecessor, 6G is more than simply an upgrade in data rates and capacity, as it will attempt to deliver downstream data rates up to 1 Tbye/s and operate at frequencies in the so-called sub terahertz region, just below where lightwave frequencies begin. It will make extensive use of artificial intelligence and machine learning to enable applications that 5G presumably will not have been addressed in the next decade." . Also included in the newsletter are a few industry headlines...

"As God As My Witness, I Thought Turkeys Could Fly"

WKRP in Cincinnati: "As God As My Witness, I Thought Turkeys Could Fly" - RF CafeAnyone who watched the WKRP in Cincinnati sitcom back in the 1970s has to remember what was one of the funniest episodes ever. Here is the 4 minutes that made Prime Time history. In this Thanksgiving episode, station owner Arthur Carlson decided he would surprise the community with good deed - that doubled as a promotional stunt for his radio station - by dropping turkeys from a helicopter for lucky shoppers at the local shopping mall. Watch the disaster unfold as Les Nessman reports live, and then see Carlson's final comment that is still used or alluded to in many comic routines. Posting this video is an RF Cafe tradition. Have a Happy Thanksgiving!

Thanks to Triad RF Systems for Their Long-Time 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.

Tuesday 24

What's New? Biggest Heathkit, Japanese Transistor Radio

What's New? Circuit Connections, Biggest Heathkit, Japanese Transistor Portable, December 1955 Radio-Electronics - RF CafeEach month Radio-Electronics magazine ran a column called "'What's New?," which contained a few products recently introduced to the marketplace, production floor, research laboratory, etc. First up was the introduction of wire wrapping as announced by Bell Telephone Laboratories a couple years earlier (see Bell Labs full-page ads in Radio-Electronics and Radio & Television News in 1953). Wire wrapping is still used today for quickly prototyping circuits that are not too sensitive to crosstalk and super high speed. Next was the announcement of a five-transistor pocket radio from a Japanese company named Tokyo Tsushin Kogyo, which you know today as Sony. Heathkit had recently put out a build-it-yourself analog computer that used 65 vacuum tubes for $750 ($7,342 in 2020 money). A button-hole-size transistor radio was also reported...

Many Thanks for Alliance Test Equipment's 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.

G-Wave Superconductor Comes into View

G-Wave Superconductor Comes into View - RF Cafe"Superconducting materials are traditionally classed into two types: s-wave and d-wave. A third type, p-wave, has long been predicted. Now, however, researchers in the U.S., Germany and Japan say they may have discovered a fourth, unexpected type of superconductor: g-wave. The result, obtained thanks to high-precision resonant ultrasound spectroscopy measurements on strontium ruthenate, could shed fresh light on the Cooper pairing mechanisms in so-called unconventional superconductors. In conventional superconductors, electrons join up to form Cooper pairs that then move through a material without any resistance. While all known superconducting materials need to be cooled to ultralow temperatures (or placed under extreme pressures) before their electrons start behaving in this way..."

Magnetic Ceramics: Ferrites

Magnetic Ceramics: Ferrites, February 1953 QST - RF CafeMagnetic ceramics have been with us for a long time - probably forever as far as most people that use them these days are concerned. When this article was published in a 1953 issue of QST magazine, ferrites for use at RF frequencies were a new, breakthrough phenomenon. Take a look at inductors used in vintage radio equipment and you will find either air or solid iron as the permeable filler elements in most instances. Whereas iron might have a permeability of 100-150, the new magnetic ceramics exhibited permeabilities up to 4,000 at 1 MHz, and even higher for lower frequencies. Modern alloys and compounds provide permeabilities of more than 50,000 for special applications. Such high values allow physical size and weight of inductors and transformers to be greatly reduced. Also, since high permeability...

ConductRF Hand Formable RF Cables at DigiKey

ConductRF Hand Formable RF Cables at DigiKey - RF CafeConductRF hand-formable 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 18 GHz. Low loss, tinned braided cable of 0.086" diameter with shielding of >100 dB. 100% factory tested for VSWR & insertion loss. RoHS & Reach compliant. Ideal for internal module linking and great for RF Testing. When compared to traditional semi-rigid options, these cables can provide increased installation flexibility at a substantially lower cost. Made in the USA!

Thanks to Copper Mountain Technologies for Continued Support

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

Monday 23

Antenna Principles - Directional Arrays and Radiation Fields

Antenna Principles - Directional Arrays and Field Patterns, February 1947 Radio-Craft - RF CafeHere in the February 1947 issue of Radio-Craft magazine is part three of a six-part series on Antenna Principles. The first two parts concentrated on dipole antennas and feeders, and multi-element long-line and rhombic antennas. Part three is on directional arrays and radiation fields. In addition to a bit of theory, real-world examples are given of various directional antenna configurations along with field strength graphs. Without powerful computers to calculate and plot out predicted radiation patterns, a large combination of experience and in-situ measurements was required. A huge amount of time was spent for even relatively simple arrays. Finitely detailed topographical and structural models are now available which, along with very precise electromagnetic field calculation algorithms allows efficient and accurate planning...

Single-Chip mm-Wave Beamformer Exploits 5G Capabilities

Single-Chip mm-Wave Beamformer Exploits 5G Capabilities - RF Cafe"The first fully integrated single-chip digital millimeter-wave (mmW) beamformer, created by electrical and computer engineers at the University of Michigan, opens up new possibilities in high-frequency 5G communications. The technology could be used to improve vehicle-to-vehicle communication, autonomous driving, satellite internet, and national defense, to name a few. Beamforming allows a device that is transmitting signals to point them in a particular direction, as opposed to having the signals radiate out in all directions - which can lead to significant interference and loss of efficiency. It is an essential technique for mmW communication, which occurs at a relatively high frequency (typically between 24 and 100 GHz). This high frequency communication allows for high-speed data transfer, one of the key advantages of 5G..."

Please Welcome Lotus Communication Systems as an RF Cafe Supporter!

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.

A Ham in the People's Paradise

A Ham in the People's Paradise - RF CafeThe December 2020 issue of QST magazine contains an article reprint from the February 1971 issue entitled "A Ham in the People's Paradise*." It was written by Ham radio operator and USS Pueblo sailor Ralph McClintock (K1SCQ) who, along with 82 shipmates, were taken prisoner by North Vietnam on January 23, 1968. He gave a first-hand account of captivity that lasted until December 23rd of that year. The following year Hanoi Jane had her smiling face photographed while posing atop an anti-aircraft gun when visiting VC troops, while John McCain was still at the Hanoi Hilton. The USS Pueblo incident is most famous for "The Digit Affair" where crewmembers routinely gave the middle finger in propaganda photographs broadcast by the North Vietnamese. The men told their VC captors it was a Hawaiian good luck symbol - until scumbag TIME magazine published the photos and explained what they were really doing, resulting in severe punishment of the men. The media has been traitorous for a long time.  (* login required - find a member to access it for you).

Triad RF Intros Bi-Directional SSPA for CW/FM and QAM Signals

Triad RF Systems Intros Bi-Directional SSPA for CW/FM and QAM Signals - RF CafeTriad RF Systems has announced the development of a dual, bi-directional amplifier that supports 2X2 MIMO radio applications. Model TTRM2005D is a solid-state-power amplifier (SSPA) that operates at a frequency of 2,200-2,500 MHz. It is designed for military and commercial use and supports a variety of signal types, from simple CW/FM signals to complex, highly modulated carriers such as 64 and 256QAM. The technical features of each channel on this dual bi-directional amplifier includes a transmit signal gain of 25 dB, a receive signal gain of 12 dB, a receive signal noise figure of 2.5 dB, and ~20 W BPSK power x2 (40 W off total RF power). Supply voltage is an ultra-wide 12−30 VDC...

Many Thanks to Atenlab for Their Support!

Atenlab microwave components - RF CafeAtenlab has been operating in Taiwan for more than a decade, and has sold and installed hundreds chambers around the world. Holistic, affordable Over-the-Air (OTA) measurement systems perform comprehensive measurement and test in a controlled environment. Compact Antenna Test Range (CATR) with one-touch operation supports multiple systems - 2G, 3G, 4G, 5G - and major instrument brands. [M]ulti-probe OTA measurement systems offer reduced time measurements over single-probe systems.

Sunday 22

Engineering Crossword Puzzle for November 22

Engineering Crossword Puzzle for November 22, 2020 - RF CafeFor the sake of avid cruciverbalists amongst us, each week I create a new crossword puzzle that has a theme related to engineering, mathematics, chemistry, physics, and other technical words. This November 29th Electronics Engineering crossword puzzle, as always, contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Hedy Lamarr or the Bikini Atoll). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

   
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