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"Communications do not just grow; they are planned." -- Brigadier General Wesley T. Guest

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

FCC Extends Use of 4.9 GHz Band by Adopting New Rules

China's 5G Infrastructure Push Continues to Accelerate

U.S. Military to Hasten Adoption of 5G with Wireless Contracts

Timekeeping Theory Combines Quantum Clocks and Einstein's Relativity

• FCC to Draft Social Media Regulations

• Thailand Enacts Ban Against Importation of Electronic Waste

RAIN RFID Market Size Estimated at $1.3B

• From Foldable Phones to Stretchy Screens

• NTU Researchers Develop Radiation-Protection for Chips in Satellites

Bell Telephone Laboratories Cavity Magnetron Development

Bell Telephone Laboratories Cavity Magnetron Development, October 1945 Radio News - RF CafeDevelopment of the cavity magnetron during World War II helped change the destiny of Allied forces through using high frequency radar with enough power to detect distant targets while using frequencies which were out of the normal detection bands of Axis forces' receivers. Most equipment at the time could not operate efficiently (or at all) above a few hundred MHz. It was considered a top-level secret with great concern that the technology not fall into the hands of German and Japanese scientists. According to this early post-war advertisement in a 1945 issue of Radio News, Bell Labs was totally consumed by the development of magnetrons, and was relieved to finally be able to boast of its critical role now that the war was over...

Please Welcome RIGOL as RF Cafe's Newest Supporter!

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.

Times Microwave Systems ½" Plenum RF Cable for DAS Networks

Times Microwave Systems ½" Plenum RF Cable for DAS Networks - RF CafeTimes Microwave Systems, a pioneering brand in innovative RF and microwave interconnect assemblies, cables and connector design, announces the addition of a new 1/2" plenum RF cable to its product line. The LPA-500 LLPL air-dielectric corrugated plenum cable is a low-loss, plenum listed (type CMP) coaxial cable. Available now, its design offers excellent intermodulation performance, and can be used as feedlines within buildings to support distributed antenna systems (DAS); public safety communications systems; RF backbone interconnects within plenum airspaces; and additional applications. The LPA-500 LLPL is an affordable option that provides the quality and performance for which Times is universally recognized. The new 1/2" plenum RF cable...

Many Thanks to Withwave for Continued Support!

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.

Housewives and Television

Housewives and Television, October 1947 Radio-Craft - RF CafeContrary to the scenario presented in this light-hearted mockery of housewives attempting to assemble some electronics kits, there were actually many women during the height of the radio and television age who were quite adept at handling soldering irons and test equipment. In fact, the case could be made that, given the 1947 appearance of this "Housewives and Television" piece in Radio-Craft magazine, women of the post-wartime industrial period were probably the most experienced and adept assemblers of electronics equipment. After all, it was Rosie the Riveter who built airplanes, ships, and tanks while Sally the Solderer built the bulk of the tens of thousands of radios, radars, sonars, medical and test instruments, vacuum tubes, amplifiers, and other electronics while the brothers...

Please Visit in Appreciation Reactel for Their Long-Time Support

Reactel Filters - RF Cafe

Reactel has become one of the industry leaders in the design and manufacture of RF and microwave filters, diplexers, and sub-assemblies. They offer the generally known tubular, LC, cavity, and waveguide designs, as well as state of the art high performance suspended substrate models. Through a continuous process of research and development, they have established a full line of filters of filters of all types - lowpass, highpass, bandpass, bandstop, diplexer, and more. Established in 1979. Please contact Reactel today to see how they might help your project.

Zeptoseconds: New Record in Short Time Measurement

Zeptoseconds: New Record in Short Time Measurement - RF Cafe"In 1999, the Egyptian chemist Ahmed Zewail received the Nobel Prize for measuring the speed at which molecules change their shape. He founded femtochemistry using ultrashort laser flashes: the formation and breakup of chemical bonds occurs in the realm of femtoseconds. Now, atomic physicists at Goethe University in Professor Reinhard Dörner's team have for the first time studied a process that is shorter than femtoseconds by magnitudes. They measured how long it takes for a photon to cross a hydrogen molecule: about 247 zeptoseconds for the average bond length of the molecule. This is the shortest timespan..."

Theory and Construction of Attenuators, Line Filters and Matching Transformers

The Theory and Construction of Attenuators, Line Filters and Matching Transformers, June 1932 Radio-Craft - RF CafeIt seems most of the articles we see on the subject of attenuator pads are based on signal reduction in terms of decibels for units of power. Although it is a simple matter to convert power decibels to voltage decibels, it would be more convenient if you are working with voltage to have formulas and tables of values based on voltage ratios. This article does just that. As a reminder, the decibel representation of a ratio is always 10 * log10 (x). If you have a voltage ratio of V1/V2 = 0.5, then 10 * log10 (0.5) = -3.01 dB. If you have a power ratio of P1/P2 = 0.5, then 10 * log10 (0.5) = -3.01 dB. Does that mean that -3.01 dB of voltage attenuation is the same as 3.01 dB of power attenuation? Confusingly, no. Let's say for the sake of simplicity that you have 1 V across a 1 Ω resistor...

Nokomis Looking for an RF/Electrical Mixed Signal Engineer

Nokomis Looking for an RF/Electrical Mixed Signal Engineer - RF CafeNokomis Inc., is a high technology research and development company located just south of Pittsburgh, PA. Nokomis does cutting-edge technology work for the Department of Defense (DoD) and other Government Agencies. We rank in the top 3 for entities under 300 employees in the state of Pennsylvania for the number of R&D contracts we typically win yearly. The candidate should be comfortable executing on and potentially leading multiple projects. This position requires a multi-disciplined Senior Electrical Engineer, capable of solving complex technical problems and providing innovative solutions in the areas of Electrical Engineering and the part, board and system level to develop the most sensitive Radio Frequency (RF) systems on the planet. Candidates with specialized experience in digital design, analog design mixed signal design or RF design will be considered as each of these disciplines is required. The ideal candidate will have an understanding of and experience with digital, analog, mixed signal and RF systems...

Many Thanks to Exodus Advanced Communications for Their Support

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

Electronics-Themed Comics, 1953 Radio-Electronics

Electronics-Themed Comics, November 1953 Radio-Electronics - RF CafeIt's about time for a little joviality so here are the three technology-themed comics which appeared in the November 1953 issue of Radio-Electronics magazine. They cover a wide range of situations experienced by electronics types back in the day, including the fickleness of customers, an exaggeration of an explorer's unexpected discovery deep in a jungle, and the frustrated indignation of a parts supplier by the selective memory of a serviceman in need of replacement components. Enjoy!

Withwave Intros Vertical Launch 1.0 mm Connector (DC to 110 GHz)

Withwave Intros Vertical Launch 1.0 mm Connector (DC to 110 GHz) - RF CafeWithwave announces the introduction of Vertical Launch Connectors which are specially designed for solderless vertical PCB launch on test & measurement board. These connectors have excellent electrical transition performance up to 26.5 GHz, 50 GHz, 67 GHz & 110 GHz respectively as well as reduce installation time by eliminating soldering. Excellent vertical transition (VSWR <1.3, 1.85 & 1.0 mm type: VSWR <1.6 ). ANSYS HFSS models available (version 17.0 or newer) for 3D EM (electromagnetic) simulation...

Reducing Risk & Improving Quality of Military Radar Receivers

Reducing Risk & Improving Quality of Military Radar Receivers - RF Cafe"An industry-leading military radar receiver manufacturer needed to deliver radar receivers that met tough new customer specifications. To ensure a quality product, the manufacturer reviewed many aspects of its test strategy, focused on ensuring its radar receivers could meet the new specifications. Radar receiver sensitivity is critical for electronic warfare (EW) applications. A radar receiver that is outside specifications will fail to decipher signals properly from long distances. This is not an option in military applications. Risk of false passes. The aerospace and defense manufacturer needed to improve receiver sensitivity and the accuracy of its power level measurements in order to meet its design specifications and cost goals..."

Many Thanks to Nova Microwave for Continuing Support!

Nova Microwave Circulators & Isolators - RF CafeNova Microwave is a leader in technically differentiated electronic and radio frequency Ferrite Circulators and Isolators that connect, protect and control critical commercial and military wireless telecommunications systems. Our staff is dedicated to research and development of standard and custom design quality Ferrite Circulators and Isolators from 380 MHz to 26.5 GHz. Available in single or multi-junction topographies, the Nova Microwave product line of is specifically designed for use in varied environmental and temperature extremes. 

Quiz #40: Introduction to Antenna Analysis Using EM Simulation

RF Cafe Quiz #40: Introduction to Antenna Analysis Using EM SimulationThis quiz is based on the information presented in Introduction to Antenna Analysis Using EM Simulation, by Hiroaki Kogure, Yoshie Kogure, and James C. Rautio, published by Artech House. It is written for novice engineers and engineering students. This easy-to-comprehend resource offers readers thorough introductory-level treatment of antenna analysis using electromagnetic (EM) simulators. This richly-illustrated book shows how to use EM software to analyze and tune wireless antennas to meet specific requirements. Readers learn important wireless antenna design terminology and gain a detailed understanding of how antennas work. Moreover, the book offers guidance in troubleshooting problems with wireless antenna designs...

BNC Webinar: Low vs. High-Resolution Detectors

BNC Webinar: Low vs. High-Resolution Detectors (Free Admission) - RF CafeBerkeley Nucleonics Corporation (BNC - like the connector) is excited to announce that our upcoming live webinar, "Low vs. High-Resolution Detectors," is less than one week away! Demystify high-resolution Scintillation with Berkeley Nucleonics and special guest Paul Schotanus from Scionix as we dive into the current landscape of high-resolution detectors in the 662 KeV Gamma range: CeBr3, LaBr3, SrI2, CLYC, and GAGG. To accommodate for time differences, we will be hosting two sessions with the same topics and agenda. Please register for the time slot that works best for you. U.S. Event - Wednesday, October 28th, 2020 @ 10:00 AM PST...

Thanks to PCBONLINE for Continued Support!

PCBONLINE - RF CafePCBONLINE supplies complex rigid and flex-rigid printed circuit boards (PCBs),and one-stop production with maximum flexibility ranging from prototype sample to mass production. Rigid-flex, HDI, multilayer, IC-loadboard, LCP 5G optical module, ceramic, MCPCB. Materials include Rogers, Taconic, Arlon, Isola, Bergquist, Kapton, Panasonic, and more. After more than 15 years of continuous efforts, PCBONLINE constantly updates our equipment, improves our technology, and serves you with the highest quality. Cost and delivery quotations online without the need for multiple phone call and/or e-mails.

Tube Testers for Speedy Checking

Tube Testers for Speedy Checking, October 1955 Radio & Television News - RF CafeIt's a pretty good bet that most RF Cafe visitors are not overly interested in vacuum tube testers. Today they are collectors' items with some actually still being used for maintaining vintage electronics gear; however, in the days before semiconductor components they were the life blood of service men. Because tubes (aka "valves" in other parts of the world) are by nature one of the most vulnerable parts of any product in which they are used, often the first step in troubleshooting a radio, television, record player, etc., was to test suspected tubes for sub par performance. As mentioned often in Mac's Radio Service Shop stories, customers balked at service centers charging for their expertise but didn't mind as much paying for replaced components. That meant mark-ups on vacuum tubes comprised...

Anatech Electronics (RF Filters) - RF Cafe PCB Directory (Assembly)
NorthEast RF Antenna Testing Services Berkeley Nucleonics Academy RF Boot Camp - RF Cafe
About RF Cafe
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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