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Homepage Archive - October 2019 (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

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See Page 1 | 2 | 3 | 4 | 5 of the October 2019 homepage archives.

Friday 25

Mac's Service Shop: Motorola's 1974 Color TV Receivers

Mac's Service Shop: Motorola's 1974 Color TV Receivers, November 1973 Popular Electronics - RF CafeEven if you are not, never were, and don't plan to be a color television serviceman, this installment of Mac's Service Shop that appeared in a 1973 issue of Popular Electronics provides an interesting insight into the manner in which the electronics industry was rapidly changing in the 1970s. By 1973 most manufacturers had fully committed to all solid state circuitry (except for the CRT, of course), and the competition was focusing on customer satisfaction. Point-to-point wiring of chassis with leaded resistors, capacitors, inductors, and interconnecting wires and coaxial cable gave way to multiple printed circuit boards (PCBs) with a maze of interconnecting wire harnesses. In theory the scheme was much more reliable and serviceable, and for the most part it was. The problem was that a lot of service guys were still struggling to come up to speed on the newfangled technology. Trying to use a 500 watt soldering iron ...

ATEC and Narda Safety Test Solutions Announce Agreement

Advanced Test Equipment Corporation and Narda Safety Test Solutions Announce New Agreement - RF CafeAdvanced Test Equipment Corporation (ATEC) announced a new agreement was reached and contracts executed between L3 Harris's Narda STS group and ATEC, making ATEC the North American distributor and the only authorized service center for calibration and repair of Narda STS and PMM equipment. ATEC is a worldwide leader in test equipment rentals, sales and calibrations, providing companies with equipment that meets all types of testing and monitoring requirements. ATEC partnered with Narda STS, the leading supplier of measuring equipment in the EMF Safety, RF Test & Measurement and EMC sectors. The RF Test & Measurement sector provides analyzers and instruments ...

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

Engineering Job Board - RF CafeRF Cafe's raison d'être is and always has been to provide useful, quality content for engineers, technicians, engineering managers, students, and hobbyists. Part of that mission is offering to post applicable job openings. HR department employees and/or managers of hiring companies are welcome to submit opportunities for posting at no charge (of course a gratuity will be graciously accepted). 3rd party recruiters and temp agencies are not included so as to assure a high quality of listings. Please read through the easy procedure to benefit from RF Cafe's high quality visitors ...

Atenlab Antenna Measurement Anechoic Chambers

AtenLab Antenna Measurement Anechoic Chambers - RF CafeAtenlabs announces the availability of a large variety of antenna measurement systems. Atenlab has developed four major categories of Over-the-Air (OTA) measurement systems to meet various requirements - A2 light type, A3 compact type, A6 standard type and A8 professional type. OTA measurement system is in widely used in communication and devices manufacturing industry, With the advancement of the OTA measurement system, customers are able to perform more comprehensive measurement and test, staying ahead in the market. Compact Antenna Test Ranges (CATR) are able to measure up to 100 GHz. The larger the compact range reflector, the larger Network Analysis the Device Under Test (DUT) ...

General Electric Vacuum Tubes Advertisement

General Electric Vacuum Tubes Advertisement, November 1944 Radio News - RF CafePeople have been worrying and complaining about machines and computers taking away jobs from humans ever since Eli Whitney invented the cotton gin (probably even before then). In this advertisement in a 1946 issue of Radio News magazine, General Electric touts the wonders of its electronic inspection apparatus that is capable of inspecting and testing hand grenade fuses at a rate of 4,000 per hour. The job is performed with a variety of specialty vacuum tube types, including an x-ray generator to produce metal-penetrating energy and a phototube to detect the resultant image. A thyratron tube provides 1/10th megavolt pulses to the x-ray tube, and sundry amplifier and rectifier tubes decide whether the image represents a good fuse ...

Tunneling Transistor Promises Combines Logic & Power

Transistor Wafer Process Promises Shorter Lead Times - RF Cafe"Only eight lithography masks to create a low-power custom logic chips, compared with 20+ for CMOS, is the claim of Nottingham-based fabless chip start-up 'Search For The Next' (SFN). As such, production lead time is reduced – the target is two weeks by December 2020, according to company CEO David Summerland. Using just those eight layers, he continued, it is also possible to include power and analogue components. Key to the whole scheme, branded Bizen, is a novel transistor - essentially a pnp device whose base is driven through a quantum tunneling junction, and which includes a second tunneling junction to internally self-bias the transistor ..."

Electro-Photonics Offering RF & Microwave Products

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.

Thursday 24

The Dispersion Transmitter

The Dispersion Transmitter, December 1944 Radio News - RF CafeYou need to have your thinking cap on for this article entitled, "The dispersion transmitter," which appeared in a 1944 issue of Radio News magazine. It might be more aptly entitled, "The Dispersion Antenna," or "How to Use a Phase-Driven Horizontal and Vertical Dipole Antenna Array to Effect a Circularly Polarized Transmission Antenna Which Continuously Scans All Combinations of Azimuth and Elevation Thereby Effectively Covering Every Point on the Earth's Surface Reachable by Ionospheric Reflection." That last title describes the ingenious system devised by author H.W. Kline. A description of tests run to verify the operation is included. He mentions that the circularly polarized signals emitted by the transmitter are usually received in a horizontally polarized orientation after being reflected in the ionosphere. Using the antenna setup for receiving signals does not benefit ...

Keysight Intros PathWave Test 2020 Software Suite

Keysight Intros PathWave Test 2020 Software Suite - RF Cafe"Keysight Technologies announced the PathWave Test 2020 software suite, which delivers an integrated experience for leading electronic manufacturers to accelerate time-to-market of their digital and wireless platforms and products. Developed on the Keysight PathWave software platform, the PathWave Test 2020 software suite enables 5G, IoT and automotive engineers and managers to streamline test data processing and analysis to speed product introductions and secure a competitive advantage in the market. PathWave Test 2020 software provides data sharing and management between platform software tools including test automation, advanced measurement, signal creation and generation ..."

ARRL Handbook for Radio Communications

ARRL Handbook for Radio Communications - RF CafeBoth the ARRL Radio Communications Handbook and the ARRL Antenna Handbook (2020 editions) have grown so large with information that they are being been made available as a set of volumes that make handling and storing them much more convenient. The six volumes are divided by major topic areas: Volume 1: Introduction & Fundamental Theory Volume 2: Practical Design & Principles PART 1 Volume 3: Practical Design & Principles PART 2 Volume 4: Antenna Systems & Radio Propagation Volume 5: Equipment Construction & Station Accessories Volume 6: Test Equipment, Troubleshooting, RFI and Index. This 97th edition of The ARRL Handbook is your complete guide to radio experimentation, discovery, and innovation ...

Amateur Broadcasting - A Menace

Amateur Broadcasting - A Menace, June 1944 QST - RF CafeJ.K. Bach (not Johann S.) was amazingly prescient in 1944 with the specific types of RF-based devices that would come to be common place in our modern world. Dig this: "Radar can even be applied to the home, as a burglar-alarm, for example, or to detect obstructions on the cellar steps. Electronic devices will find many other uses as high-frequency paint-dryers, veneer-gluers, and even cordless permanent-waving machines for the ladies. Garage-door openers and other remote-control devices are not only possible but practical. Then there are certain to be other applications such as personal pedestrian telephones, two-way wrist-radios and nursery baby-cry announcing systems." Nostradamus' divination record might not even be that good. His tongue-in-cheek thesis of ubiquitous RF interference due to the presence of Ham radio operators ...

Rare "Lazarus Superconductivity" Observed in Rediscovered Material

Rare "Lazarus superconductivity" Observed in Rediscovered Material - RF Cafe"Researchers from the University of Maryland, the National Institute of Standards and Technology (NIST), the National High Magnetic Field Laboratory (NHMFL) and the University of Oxford have observed a rare phenomenon called re-entrant superconductivity in the material uranium ditelluride. The discovery furthers the case for uranium ditelluride as a promising material for use in quantum computers. Nicknamed "Lazarus superconductivity" after the biblical character who rose from the dead, the phenomenon occurs when a superconducting state arises, breaks down, then re-emerges in a material due to a change in a specific parameter - in this case, the application of a very strong magnetic field ..."

MPDevice: RF & Microwave Circulators & Isolators

MPDevice - RF CafeMPDevice (MPD) has become a trustworthy and reliable company in the global RF market as a manufacturer of passive RF Devices. Included are attenuators and terminations, coaxial connectors, adapters, and cable assemblies, DC blocks, surge arrestors, power combiner / dividers, and directional couplers. The Korean Telecommunication market is now entering into the era of hyperconnected society. With continuous enhancement in R&D capabilities and quality control, MPD will continue in an effort to become the No. 1 technologically innovative company with a focus on the emerging 5G marketplace.

Wednesday 23

For the Record...

For the Record, November 1944 Radio News - RF CafeAs I have pointed out in the past, by the end of 1944, everyone - at least in the United States - was pretty much convinced that World War II was all but done. Advertisements and articles in most of the magazines were going full force with promoting a plethora of great new consumer products that would soon be flowing from post-war factories and into the homes of the families who had sacrificed life, limb, fortune, and opportunity on the parts of fathers, brothers, boyfriends, and husbands who fought Axis powers during the past four and a half years. Parents, children, and wives of those who went "Over There" played an invaluable part back home in the success by managing single-parent households and filling in on jobs formerly performed by the servicemen. Life was difficult at home and on the battlefield but they persevered. We still refer to them collectively as "The Greatest Generation." Interestingly, one of the main impediments to implementing the aforementioned grand plan was difficulty in transporting raw materials and piece parts to manufacturing plants, and then distributing finished goods to the stores. Recall that ...

Empower RF Intros 2 kW L-Band Solid State Amplifier for GPS Denial

Empower RF Systems Intros 2 kW L-Band Solid State Amplifier for GPS Denial - RF CafeEmpower RF Systems' Model 2226 is a compact high power GaN solid state CW emitter designed for GPS denial and is based on the established and field proven Next Generation system architecture. This architecture is tactically deployed and operating on multiple levels in support of a variety of critical DOD missions. Equally suited for Jamming, Threat Simulation, Multipaction, HIRF, and Automotive EMC applications the 2226 comes complete with internal DDC, external forward and reverse sample ports, and an easy to use web served GUI. In depth health monitoring with alarms visible on the front panel are also pushed out the LAN port. Output modes include Manual Gain Control (MGC), AGC and ALC ...

Unpopular Electronics

Unpopular Electronics, August 1959 Popular Electronics - RF CafeYou would be hard pressed to find an electronics magazine today that included poetry as part of its typical features. I have published pages from the ARRL's QST magazine from the 1940s that had poems. Of course, the theme of the poems is almost always humor or parody, but poetry was not an unknown / unpracticed art by the general populace as it appears to be today. Anyway, enjoy the jovial rhymes here from the August 1959 issue of Popular Electronics. Frequent comic contributor Carl Kohler provides the illustrations for the rhymes of Saunder Harris ...

ARRL Antenna Handbook 2020

ARRL Antenna Handbook 2020- RF CafeBoth the ARRL Antenna Handbook and the ARRL Radio Communications Handbook (2020 editions) have grown so large with information that they are being been made available as a set of volumes that make handling and storing them much more convenient. The ARRL Antenna Book for Radio Communications is undoubtedly the best single resource covering antenna theory, design and construction, and practical treatments and projects. This 4-book set contains everything you need to understand how radio signals propagate, how antennas work, and how to construct your own antenna system. Presented in this 24th edition of The Antenna Book is persistent pioneering development by radio amateurs, for radio amateurs ...

X-Ray Tech Lays Chip Secrets Bare

X-Ray Tech Lays Chip Secrets Bare - RF Cafe"Researchers in Switzerland and the U.S. have a non-destructive technique that can reverse engineer an entire chip without damaging it. Ptychographic X-ray laminography can scan an entire chip or zoom in on a particular spot to reveal its circuits. Scientists and engineers in Switzerland and California have come up with a technique that can reveal the 3D design of a modern microprocessor without destroying it. Typically today, such reverse engineering is a time-consuming process that involves painstakingly removing each of a chip's many nanometers-thick interconnect layers and mapping them using a hierarchy of different imaging techniques, from optical microscopy for the larger features to electron microscopy for the tiniest features ..."

Exodus Advanced Communications: RF & Microwave Power Amplifiers

Exodus Advanced Communications - RF CafeExodus Advanced Communications is a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide. Power amplifiers ranging from 10 kHz to 51 GHz with various output power levels and noise figure ranges, we fully support custom designs and manufacturing requirements for both small and large volume levels. decades of combined experience in the RF field for numerous applications including military jamming, communications, radar, EMI/EMC and various commercial projects with all designing and manufacturing of our HPA, MPA, and LNA products in-house.

Tuesday 22

Nation-Wide Television is Now in the Making

Nation-Wide Television is Now in the Making, January 1948, Radio-Craft - RF CafeDr. Allen Du Mont played a huge role in making television practical because of the improvements he made to the cathode ray tube (CRT). Prior to his work, the lifespan of a CRT was measured in tens of hours, and they were expensive, so their use was limited to special military and research applications. Du Mont's interest in "wireless" began at an early age, and he earned his commercial radio operator's license at the age of 14 (in 1915). He designed and produced oscillographs (i.e., oscilloscopes) that incorporated his CRTs. His involvement in the television industry was a natural evolution and extension of the work done in related industries. The DuMont Television Network was formed in 1942, rivaling the established CBS and NBC ...

Skyworks Intros FEMs for Ultra-Low Power IoT Applications

Skyworks Intros FEMs for Ultra-Low Power IoT Applications - RF CafeSkyworks is pleased to launch the SKY66405-11, a 2.4 GHz front-end module (FEM) designed for ZigBee®, Thread, and Bluetooth® (including Low Energy) ultra-low power IoT applications spanning sensors, beacons, smart meters and thermostats, wireless cameras, smoke and CO detectors, wearables and medical wearables. This high-performance, integrated multi-chip module comes in a compact form factor (1.9 x 1.9 x 0.56 mm) and provides increased efficiency as well as more than 4X range extension versus system-on-chip (SoC) alone. The solution includes a power amplifier, low-noise amplifier, low-loss bypass path, transmit and receive switches ...

IEEE GlobalSpec 2019 Pulse of Engineering Survey

IEEE GlobalSpec 2019 Pulse of Engineering Survey - RF CafeI usually take you straight to the source of a survey, but in this case you're better served reading EE Times' report on the newly released "IEEE GlobalSpec 2019 Pulse of Engineering Survey." Martin Rowe provides a comparison between the 2018 and 2019 results. One of the most significant differences I see is response to "New hires are being added to handle additional work, not just to replace staff vacancies" dropping from 38% last year to 28% this year. Mr. Rowe offer two possible reasons, but a third reason might be that employers hired most of their needed engineers last year ...

How's Your Radio Geography?

  How's Your Radio Geography? August 25, 1945 Saturday Evening Post - RF CafeWith a cover date of August 25, 1945, this issue of The Saturday Evening Post obviously went to print some time prior to the dropping of the two nuclear bombs on Japan that ended World War II. Victory in Japan Day (V-J Day), was August 14, 1945. There is no hint inside the magazine that the end of the war was nigh. There were, however, plenty of ads by companies touting their contributions to the war, and even some ads, particularly food ads, anticipating the end of rationing. Within this edition is also a short quiz entitled, "How's Your Radio Knowledge?" The author, Captain James F. C. Hyde, Jr., challenges readers to identify the locations of radio stations just by looking at their call signs. As is done today, most stations attempt to get call signs that are relevant to their location ...

Highly Sensitive Diode Converts Radio Waves into Electricity

Highly Sensitive Diode Converts Radio Waves into Electricity - RF Cafe"Researchers from Japan have developed a highly sensitive rectifying element in the form of a nanowire backward diode, which can convert low-power microwaves into electricity. The research was carried out by leading communication technology company, Fujitsu, in partnership with the Japan Science and Technology Agency (JST), and the Tokyo Metropolitan University. Through JST's Strategic Basic Research Programs, the technology was developed by researchers led by Kenichi Kawaguchi of Fujitsu Limited and Professor Michihiko Suhara of the Tokyo Metropolitan University. The new technology can generate electricity from ambient radio waves ..."

Withwave: RF & Microwave Components

Withwave RF & Microwave Components - RF CafeWithwave manufactures an extensive line of metrology quality coaxial test cable assemblies, connectors (wave-, end-, vertical-launch, board edge, panel mount), calibration kits (SOLT), a fully automated 4-port vector network analyzer (VNA) calibrator, between- and in-series connector adaptors, attenuators, terminations, DC blocks, torque wrenches, test probes & probe positioner. Special test fixtures for calibration and multicoax cable assemblies. Frequency ranges from DC through 110 GHz. Please contact Withwave today to see how they can help your project succeed.

Monday 21

Highest TV Transmitter in Europe

Highest TV Transmitter in Europe, August 1958 Radio News - RF CafeWhen I saw this photo of the Mount Säntis television transmission tower in Switzerland, the first thing I thought of was the scene in the James Bond "Moonraker" movie where 007 battles the infamous Jaws while riding a cable car. That took place in an area around the Mediterranean though, so maybe it was "Where Eagles Dare" or some other spy / military movie I was thinking of. The tower is featured on a Wikipedia webpage where it states in part: "Located at the peak of the Säntis is a 123.55 meter high transmission tower, which was commissioned in November 1997. The original tower stemming from the year 1955 had to be renovated several times due to the rough ...

RF Cascade Workbook 2018

RF Cascade Workbook 2018 Is Available Now! - RF CafeRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features. Hundreds of hours have gone into developing this tool ...

Withwave Intros High Speed MultiCoax Cable Assemblies

Withwave Intros High Speed MultiCoax Cable Assemblies - RF CafeWithwave has introduced a new line of High Speed & High Density Multicoax Cable Assemblies (WMX Series) that provide a wide range of multiple coax connectors and flexible cable assemblies with a choice of 20, 40, 50, and 67 GHz configurations based on precision array design and superior high frequency cabling solutions. The WMX Series are excellent signal integrity solutions for bench-top testing and automated test equipment to meet increasing demands of semiconductor test equipment and optical testing industries. These products consist of high performance flexible assemblies which can be bundled in housings (8 and 16 channels) and the interface to board is compression type ...

Westinghouse Models H-161, H-168, H-168A

Westinghouse Models H-161, H-168, H-168A, July 1948 Radio News - RF CafeThis Radio Service Data Sheet provides schematics and parts lists for Westinghouse Models H-161, H-168 and H-168A receivers. Most - if not all - electronics servicemen had subscriptions to these magazines because they were a ready source of not just these service sheets, but because of the extensive articles offering advice on servicing radios and televisions. In fact, many electronics manufacturers had a policy of supplying service data only to bona fide shops. A large list is included at the bottom of the page of similar documents from vintage receiver schematics, troubleshooting tips, and alignment procedures. They were originally published in magazines like Radio-Craft, Radio and Television News, Radio News, etc. I scan and post them for the benefit of hobbyists who restore and service vintage ...

Shape-Shifting Origami Antenna Systems Adapt on the Fly

Shape-Shifting Origami Antenna Systems Adapt on the Fly - RF Cafe"Silver dipoles are arranged across the folds of a Miuri-Ori pattern to enable frequency blocking. Researchers at the Georgia Institute of Technology have devised a method for using an origami-based structure to create radio frequency filters that have adjustable dimensions, enabling the devices to change which signals they block throughout a large range of frequencies. The new approach to creating these tunable filters could have a variety of uses, from antenna systems capable of adapting in real-time to ambient conditions to the next generation of electromagnetic cloaking systems that could be reconfigured on the fly to reflect or absorb different frequencies. The team focused on one particular pattern of origami ..."

TotalTemp Technologies: Thermal Platforms for −100°C to +200°C

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.

Sunday 20

Engineering & Science Crossword Puzzle for October 20

Engineering & Science Crossword Puzzle October 20, 2019 - RF CafeFor two decades, I have been creating custom engineering- and science-themed crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. This October 20, 2019, puzzle uses a database of thousands of words which I have built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc. 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 or a geographical location like Tunguska, Russia ...

Lotus Communication Systems Modular RF Component Building Blocks - RF Cafe

Amplifier Solutions Corporation (ASC) - RF Cafe
Berkeley Nucleonics Corporation - RF Cafe
RF Cascade Workbook 2018 by RF Cafe

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    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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