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Homepage Archive - September 2017 (page 2)

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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Wednesday 20

ConductRF Offers Phase Matching Cable Solutions

ConductRF Phase Matching Cable Solutions 9/19/2017 - RF CafeConductRF's skill in the manufacturing of Phase Matched RF Cable Solutions is second to none. We have phase matched a diverse array of solutions from Low Frequency RG and LMR Cables to more premium exotic cables up to 70 GHz. Flexible, conformable & semi-rigid, phase & amplitude stable, low loss & high power, phase differential as low as ±0.2 °/GHz, many connector types, indoor & outdoor solutions. A broad base of standard connectors and cables in stock, we turn solutions around fast ...

Self-Folding Electronics Could Enable Advanced Robotics

Self-Folding Electronics Could Enable Advanced Robotics - RF Cafe"As demand grows for more versatile, advanced robotics and other technologies, the need for components that can enable these applications also increases. Producing such components en masse has been a major challenge. But now, in ACS Applied Materials & Interfaces, researchers report that they have developed a way to help meet this need by printing electronics that can fold themselves into a desired shape. Creating small electronic pieces with specific architectural designs can now ..."

Opportunity Awareness

Opportunity Awareness, October 1970 Popular Electronics - RF CafeEach month (unless I forget) I post a list of articles with advice on career enhancement including tips on preparing resumes, conducting yourself properly at interviews, getting along well with co-workers, handling a difficult boss, etc. I also post links to polls and studies done on career satisfaction, pay rates, education and experience levels, years in the field, etc. Those types of articles have been around since Johannes Gutenberg invented the movable type printing press. In the 1970s, Popular Electronics rand a series of articles titled "Opportunity Awareness" that offered such advice, much of which in principle is still valid today. One of the biggest advantages you can give yourself ...

Notable Tech Quote: Kat McGowan

Notable Tech Quote: Kat McGowen - RF Cafe"There, his new specimens joined his collection and waited patiently as only rocks can until he could find time to analyze them." - Kat McGowan, "Where Did It Begin?" September / October 2017 Popular Science (p41).

Circularly Polarized Antennas Explained, Without the Math

Circularly Polarized Antennas Explained, Without the Math - RF CafeGlenn Robb, owner / engineer from Antenna Test Lab Company sent me this very excellent whitepaper he just wrote titled "Circularly Polarized Antennas Explained, Without the Math." As promised, his tutorial introduces the concept of circular polarization in electromagnetic waves and then describes how he measures and reports results in a spreadsheet using automated antenna positioning and frequency sweeping. Antenna Test Lab Co's evaluation service includes fully circular polarization antenna evaluations at no extra charge. Practical antenna evaluations with 2D or 3D patterns in hundreds of test directions (and frequencies) are available for $450 ...

AlGaN Transistors on Silicon-on-Insulator Substrate

Aluminium Gallium Nitride Transistors on Silicon-on-Insulator Substrate - RF Cafe"Chang Gung University and Episil-Precision in Taiwan claim the first demonstration of in-situ silicon nitride (SiNx) gate dielectric aluminium gallium nitride (AlGaN) barrier metal–insulator–semiconductor high-electron-mobility transistors (MISHEMTs) on 6-inch silicon on insulator (SOI) substrates. The devices showed improved DC, dynamic and radio frequency (RF) performance over the same structures grown on HR Si ..."

Tuesday 19

UK Dragonfire Laser Cannon Unveiled at DSEI

UK Dragonfire Laser Cannon Unveiled at DSEI - RF Cafe"Under development by an MBDA-led consortium which includes Qinetiq, Leonardo-Finmeccanica, Arke, BAE Systems, Marshall and GKN the so-called Dragonfire system will be a 50 kW class directed energy weapon designed for use on both land and sea. Laser weapons have key advantages over traditional systems: the munition is potentially unlimited, and it operates at the speed of light so the time from when you say "fire" to the weapon hitting its target is more or less instantaneous. According ..."

Bluetooth: "mesh is here"

Bluetooth "mesh is here" - RF CafeMaybe I'm just easily impressed by effective simplicity, but I really like the Bluetooth homepage animation demonstrating the ubiquitous connectivity theme of "mesh is here." Interconnecting lines in the mesh moving in relation to all the nodal points is a great way to illustrate the flexibility of the system. The one scenario the Bluetooth SIG doesn't show is how "mesh" enables tracking of your movement, which can easily be correlated with cellphone activity, credit card usage, etc. Surely the collective data would never be abused. If you're not doing anything wrong, then there's nothing to worry about -- right? ...

Communications, October 1970 Popular Electronics

Communications, October 1970 Popular Electronics - RF CafePopular Electronics ran a monthly news roundup feature titled, simply, "Communications." Included were tidbits on CB, SWL, HAM, RTTY, FAX, TV, SSB, AM, FM, CW, and ISB. I know that because those are the acronyms in the string along the perimeter of the page's title. This particular column was chosen because of the weird-looking Elser-Mathes Cup that will commemorate the 1st amateur radio 2-way communications between Earth and Mars." I thought it as an artifact of some primitive tribe's religious rite, but in fact those are Martians in the carving, not Earthly savages ...

DARPA Funds New Electronics Revolution

DARPA Funds New Electronics Revolution - RF Cafe"Building on a half century of unprecedented chip scaling and technology innovation, DOD is going back to basics in an attempt to reseed a U.S. electronics sector that has contributed mightily to the nation's economic and national security. The Defense Advanced Research Projects Agency put more skin in the game with a batch of program announcements worth $75 million over the next year as part of its Electronics Resurgence Initiative (ERI) launched in June ..."

Career Tips for September

Engineering Career and Job Hunting Advice for September 2017 - RF CafeI made the rounds of employment advice websites and pulled out these useful ones for September. A rather strange result is two articles written for Monster, one suggesting jobs for introverts and the other for extroverts. The strangeness lies in how both list contain the same job types - not sure of that was intentional or not.

Can Your Alma Mater Influence Lifetime Earnings?

How to Bargain for the Best Possible Salary

Resume Tips & Career Advice for Entry-Level Engineers

Gender Quotas in the Workplace

How Americans Perceive the Workplace  <more>

Collegiate Amateur Radio Initiative Holds 2nd Annual Meeting

Collegiate Amateur Radio Initiative Holds 2nd Annual Meeting - RF Cafe"The Amateur Radio Club at Yale University (W1YU) was the host for the 2nd annual Collegiate Amateur Radio Initiative (CARI) forum at the ARRL New England Division Convention, September 8–10, in Boxboro, Massachusetts. ARRL CEO Tom Gallagher, NY2RF, who — in light of the increasing number of reactivated and newly formed radio clubs at colleges and universities — has been a prime mover behind the League initiative, opened the session. Four presentations by participating institutions followed. Sean Barnes, N3JQ, of Harrisburg ..."

Monday 18

KR Electronics Intros 160 MHz BPF for Positive Train Control

KR Electronics Intros 160 MHz Bandpass Filter for Positive Train Control - RF CafeKR Electronics part number 3012-160 is a 160 MHz bandpass filter designed for Positive Train Control (PTC) applications. Encapsulated for enhanced shock and vibration resistance, 50 Ω source and load, N(F) to N(M) connectors. The filters are encapsulated/ruggedized for enhanced shock and vibration resistance. Thousands are currently installed and operating successfully in the field with major rail companies. Other frequencies and bandwidths are available ... 

Please Welcome Sainty-Tech Communications as New Supporter!

Sainty-Tech Communications - RF CafeSainty-Tech Communications (STC) is an ISO 9001 certified company. We provide our customers with excellent RF & microwave products including coax connectors & cable assemblies, couplers, filters, combiners & dividers, attenuators & terminations, circulators and isolators, and precision machined parts. All the products are 100% tested before shipping. Customization is also possible. Please visit STC today ...

Build an Electrolytic Restorer

Build an Electrolytic Restorer, October 1970 Popular Electronics - RF CafeReading this kind of article takes me back to my days of building prototype circuits as an electronics technician at Westinghouse Electric's Oceanic Division in Annapolis, MD. It was without a doubt the best technician job I ever had. In fact, working with über engineer Jim Wilson and a few others is what really drove my determination to get an electrical engineering degree of my own. Laying out perf boards for resistors, capacitors, inductors, LEDs, switches, etc., and soldering all the point-to-point connections, then testing (and sometimes fixing miswirings) was a great gig. Drilling and labeling the project box with the dry transfer rub-ons in an attempt to make everything look as "real" ...

Axiom Test Equipment September Specials

Axiom Test Equipment September 2017 Specials - RF CafeAxiom Test Equipment, a provider of efficient and cost effective solutions customers' test equipment needs, offer the following special deals on their inventory. Axiom offers our customers several practical, efficient and cost effective solutions for their business or projects' test equipment needs. Whether you need to rent & buy test equipment, repair test equipment, sell or trade equipment, we are committed to providing superior customer service and high quality electronic test equipment ...

Build an Induction Charger

Build an Induction Charger (Nuts & Volts) - RF Cafe"Nut & Volts" is one of my favorite magazines because of all the good project and theory articles presented in layman's terms. I have to read it online nowadays because my print subscription ran out last year. This article by Matthew Bates shows how to build a simple - but very functional - induction charger for wirelessly charging appropriately fitted devices. It uses a PICAXE 08M2 microcontroller to generate the 12 kHz signal, but you could substitute something else like a 555 timer if you do not have the equipment to program the 08M2 ...

Thanks to Antenna Test Lab Co for Continued Support!

Antenna Test Lab Co logoSince 2001, Antenna Test Lab Co has evaluated countless antennas and RF transmitter products. With a fully anechoic Antenna Test Lab Co Anechoic Chamber - RF Cafechamber, antennas can be quickly developed and RF products refined and deployed. Mounting surfaces like drywall, glass, wood, and even curved metal Antenna Test Lab Co 2D & 2D Patterns - RF Cafesimulated automobile available. The price for a standard resolution 2D or 3D field pattern plot is only $450 - for a passive or radiating antenna. That is an incredible deal!

Multimillion Dollar Skyscraper in San Francisco is Sinking Fast

Multimillion Dollar Skyscraper in San Francisco is Sinking Fast - RF Cafe"The fourth-tallest building in San Francisco continues to sink after sinking over 17 inches already. Engineers are working to quickly find a solution to save the multimillion-dollar condos inside the building. One of the largest luxury towers in the San Francisco area is rapidly sinking, and engineers don't know how yet to fix the problem. Since being finished, the building has sunk 17 inches (43 cm) and tilted 14 inches (36 cm) toward the street. Millennium Tower is a high-rise luxury residential complex ..."

Sunday 17

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines

RF Cafe Engineering Crossword Puzzle w/Weekly Headlines September 17, 2017For 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. At least 10 clues in this puzzle with an asterisk (*) are pulled from this past week's (9/11 - 9/15) "Tech Industry Headlines" column on the RF Cafe homepage (see the Headline Archives page for help). Enjoy ...

Friday 15

Keysight's SystemVue 2017 Enables Industry's First 5G Design

Keysight Technologies' SystemVue 2017 Simulation Software Enables Industry's First 5G Design, Verification Process - RF CafeKeysight Technologies today announced the latest release of its SystemVue electronic system level (ESL) software. Offering unique phased-array antenna and other 5G functionality, Keysight EEsof EDA's SystemVue 2017 provides designers with the industry's first 5G design and verification process. SystemVue is the industry's premier simulation platform for system design and verification. The software enables users to combine existing baseband, RF and channel models for evaluation of the entire system ...

High-Frequency, High Bandwidth Millimeter-Wave Phased Array Chip

High-Frequency, High Bandwidth Millimeter-Wave Phased Array Chip - RF Cafe"Engineers at the University of California, Davis have designed a new high-frequency electronic computer chip with amazing capabilities. The chip has the potential to transmit tens of gigabits of data in mere seconds, and dramatically change the course of information technology by making it faster, more streamlined, and far more effective than current models. The chip is designed using a phased array antenna system. The system takes energy from various sources and funnels them into a single beam. The final product is a chip that operates at 370 GHz with 52 GHz of bandwidth ..."

Mac's Service Shop: Electric Shock

Mac's Service Shop: Electric Shock, August 1969 Electronics World - RF CafeUh-oh, I'd better issue a sensitivity warning before going on, because this article reports on electrocution data gathered via empirical testing that demonstrates a difference between men and women, especially since men fared better. Charles Dalziel, inventor of the ground fault interrupter (GFI) circuit, subjected men and women to increasing electrical current levels to determine how much each could take and still be able to release the small wire carrying the shocking current to their hands. The average "let-go current" was found to be 16 mA for men and 10.5 mA for women. Clearly sexism is present somewhere in the test ...

Skyworks Powers M2M Apps with Industry Leading Cellular Engines

Skyworks Powers Machine-to-Machine Applications with Industry Leading Cellular Engines - RF CafeSkyworks today announced that its SkyOne® Ultra 2.5 and diversity receive (DRx™) modules for mobile applications have been adopted by some of the world's leading machine-to-machine (M2M) module manufacturers to provide high performance, high speed 4G LTE capability. These fully integrated and tested systems, packaged in extremely small form factors, enable M2M suppliers including Fibocom, Sierra Wireless, and Telit to extend plug and play, high-speed cellular connectivity across an endless array of IoT ...

Interferometry Technology Sought to Keep Eye on Satellites

Interferometry Technology Sought to Keep Eye on Satellites - RF Cafe"The Intelligence Advanced Research Projects Activity (IARPA) agency is looking for ground-based imaging technology powerful enough to clearly capture satellites in faraway geosynchronous earth orbit (GEO), according to the Office of the Director of National Intelligence. Advanced interferometry technology will be the key to rapid and accurate imaging of GEO satellites that travel some 36,000 km above the earth, according to the IARPA broad agency announcement. One solution ..."

Thursday 14

Pasternack Relay Controlled Program. Attenuators up to 127 dB

Pasternack Launches New Relay Controlled Programmable Attenuators that Offer Precision Stepped Attenuation Levels up to 127 dB - RF CafePasternack, a leading provider of RF, microwave and millimeter wave products, has released a new series of relay controlled programmable attenuators. Typical applications include signal conditioning and level control, matching impedances of sources and loads and measuring the gain or loss of two-port devices. Relay Controlled Programmable Attenuators offer accurate and stable performance with very low harmonic distortion (IMD) and cover multiple RF frequency bands down to DC ...

Printed-Circuit Laminates

Printed-Circuit Laminates, October 1969 Electronics World - RF CafeThis is another of a series of articles (PCBs) that appeared in the October 1969 issue of Electronics World, reporting on the latest and greatest advances in printed circuit board technology. Already in production were rigid multi-layer laminates, flexible plastic laminates, and special-purpose laminates for hazardous duty applications. Author Norman Skow does not mention how many layers were routinely accomplished at the time. Plated-through holes were a relatively recent thing for high volume manufacturing. Of course population of PCB components was still a completely manual procedure since pick-and-place machines were still a couple decades away ...

CBRS: Great Opportunities… and Challenges

Anatech Electronics Newsletter for August 2017 - RF CafeAnatech Electronics, a manufacturer of RF and microwave filters, has published its August newsletter. In it, Sam Benzacar discusses the Federal Communication Commission's relatively new (2015) three-tiered "spectrum sharing" scheme titled Citizens Broadband Radio Service (CBRS). It provides for 150 MHz of spectrum between 3550 and 3700 MHz. Don't be fooled by the name, though. The "Citizens [broad]Band" nomenclature harkens back to Citizen Band (CB) radio (27 MHz), but CBRS spectrum will be sold to the highest bidder in 10 MHz chunks that are subordinated to primary user claims. So, don't be looking ...

Radiocrafts RC1880 Ultra-Low Power Radio Module for IoT Apps

Radiocrafts RC1880 Ultra-Low Power Radio Module for IoT Applications - RF CafeRadiocrafts AS, a leading provider of RF modules and wireless connectivity solutions, provides a new ultra-low power radio module platform for Smart Metering, Internet of Things (IoT) and Wireless Sensor Networks applications. The new compact RF module is also suitable for 6LoWPAN based IP networks. The RC18x0 Radio Module platform is a series of compact surface-mounted ultra-low power RF modules based on the CC1310 system-on-chip from Texas Instruments. The modules ...

Happy Academics Prove Money Isn't Everything

Happy Academics Prove Money Isn't Everything - RF Cafe"Despite earning lower salaries on average than their colleagues in other sectors, UK engineering academics are considerably happier in their jobs, according to The Engineer's 2017 Salary Survey. Based on responses from 2743 engineers working across 11 different sectors, this year's survey – which was published earlier this summer – found that despite receiving the lowest average annual salary amongst UK engineers (£43,809), 61% of academics are content in their current roles ..."

Wednesday 13

Flip-Flop Qubits: Radical New Quantum Computing Design

Flip-Flop Qubits: Radical New Quantum Computing Design Invented - RF Cafe"Engineers at Australia's University of New South Wales have invented a radical new architecture for quantum computing, based on novel 'flip-flop qubits', that promises to make the large-scale manufacture of quantum chips dramatically cheaper - and easier - than thought possible. The new chip design, detailed in the journal Nature Communications, allows for a silicon quantum processor that can be scaled up without the precise ..."

3-D Printing Fast-Tracks Circuit Prototyping

3-D Printing Fast-Tracks Circuit Prototyping - RF Cafe"Circuit prototyping traditionally requires tedious layouts using CAD tools, transfer of those plans to a printed-circuit board maker, precise placement of components on the pc board using pick-and-place robots, and then a wave soldering step to establish electrical contact between the components and the board. Prototyping engineers wait weeks before they can test the circuit board, find its flaws, and repeat the process until they get it right. The Charles Stark Draper ..."

Printed-Circuit Technology

Printed-Circuit Technology, October 1969 Electronics World - RF CafeThe October issue of Electronics World magazine included many articles written by printed circuit board (PCB) industry leaders regarding the state of the art. Multi-layer PCB technology was still in its infancy at the time, with most prototype and production boards being 1- or 2-sided. As with the switch from vacuum tubes to transistors, there were hold-outs who resisted the change to PCBs - for good reason in some cases. A list of advantages and disadvantages is presented both for and against, respectively, use of printed circuit boards. One of the biggest advantages to point-to-point wiring was that circuit modifications ...

VidaRF Offers Hand Formed Cable Assemblies

VidaRF Offers Hand Formed Cable Assemblies - RF CafeVidaRF offers DC to18 GHz hand formed semi-flex cable assemblies. The outer shield is copper braid, silver plated to minimize signal leakage and maintain flexibility for ease of bending to your requirement. Option to include insulated clear or blue jacket reducing risk of shorting. Available in a wide variety of connector combinations. Excellent return loss and insertion loss ...

Saelig Intros RTSA7550 Real-Time 27 GHz Spectrum Analyzers

Saelig Introduces RTSA7550 Real-Time 27 GHz Spectrum Analyzers - RF CafeSaelig Company announces the availability of the compact RTSA7550 Real-Time Spectrum Analyzer - a powerful, full-featured spectrum analyzer designed to analyze wireless signals in real-time (not progressively scanned). This is essential for seeing intermittent and frequency-varying signals. The Model RTSA7550 has all the standard features of a conventional spectrum analyzer such as frequency controls, marker functions, and multi-trace functionality. Instead of scanning through a frequency range, the RTSA sees all frequencies at once, thus catching intermittent signals ...

Reinventing Electronic Warfare

Reinventing Electronic Warfare - RF Cafe"The Pentagon's recently completed Electronic Warfare strategy calls for increased investment in advanced electronic warfare technology designed for defense, as well as a proactive use of emerging electromagnetic spectrum systems to attack enemies. While the new strategy is described by DOD as being 'For Official Use Only' - to be shared with relevant U.S. military developers and defense industry sources ..."

Tuesday 12

IEEE 2016 Patent Power Pipeline

IEEE 2016 Patent Power Pipeline - RF CafeA press release came in yesterday from the folks at Peregrine Semiconductor boasting (deservedly) about their ranking at 4th place in the Semiconductor category of the IEEE's 2016 Patent Power Pipeline report. An interactive bar chart and world map allows you to select from 17 categories (singularly or mixed). Semiconductor Energy Laboratory (SEL) came in at #1, RF Micro Devices (RFMD, now Qorvo) ranked #9 (BTW, there are some very talented former RFMD people I know who now work for Peregrine). Qorvo is in 11th place. Rankings are based on records from the USPTO ...

Pilot's Death Defying Photoshop Skills Shocking the Internet

Pilot's Death Defying Photoshop Skills Shocking the Internet - RF CafeThis is great! "This Brazilian pilot is in big trouble for taking selfies thousands of feet up, even though the photos are fake. Pilotganso is a well-known Instagrammer with 72K followers; he's gained a rabid following thanks to the incredible selfies on his page showing the aviator hanging out the cockpit of a Boeing 737 thousands of feet above the earth. His shots have many scratching their heads as to whether they are in fact real. No, they're not. The Instagrammer, real name Daniel Centeno achieves these aerial shots using ..."

Decibels Without Logs

Decibels Without Logs, September 1969 Electronics World - RF CafeExperienced RF engineers, technicians, and hobbyists employ decibels in their writings and speech with the fluidity and familiarity of chemists discussing pH levels, geneticists recommending DNA sequencing enzymes, astrophysicists calculating gravitational lensing constants for massive galaxies, or vintage car motorheads calling out ignition timing in reference to TDC (top-dead-center). This article by William Miller takes yet another shot at helping those uninitiated in the realm of decibels to be effectively functional until an eventual - and necessary - firm grasp of the concept is obtained ...

World's Most Powerful X-Ray Laser Begins Operation

World's Most Powerful X-Ray Laser Begins Operation - RF Cafe"Scientists across Europe have hailed the dawn of a new era of molecular research, thanks to the official opening of The European X-ray Free Electron Laser (XFEL), the largest and most powerful X-ray laser in the world. Based in the German city of Hamburg, the billion Euro facility consists of a superconducting linear accelerator and a photon beamlines housed in a 3.4 km long underground tunnel running from the DESY research centre in Hamburg ..."

NI AWR Design Environment Demos in Booth #317 at EDI CON USA 2017

NI AWR Design Environment Demos in Booth #317 at EDI CON USA 2017 - RF CafeNI AWR Design Environment V13 will be featured in a variety of activities at EDI CON USA 2017, being held September 11-13 in Boston. Software demonstrations in Booth #317 and conference presentations within the Low-Power RF & IoT, Radar / Defense, 5G Advanced Communications and RF and Microwave Design technical tracks as well as a power amplifier (PA) design workshop will all be showcased ...

Fixed-Point, Floating-Point, and Numerical Formats

What's the Difference Between Fixed-Point, Floating-Point, and Numerical Formats? - RF CafeThis is a good review for anyone who hasn't written code in many moons. "Embedded C and C++ programmers are familiar with signed and unsigned integers and floating-point values of various sizes, but a number of numerical formats can be used in embedded applications. Here we take a look at all of these formats and where they might be found. One reason for examining different formats is to understand how they work and where they can be applied ..."

Monday 11

KR Electronics Intros 916 MHz BPF for Positive Train Control

KR Electronics Intros 916 MHz Bandpass Filter for Positive Train Control - RF CafeKR Electronics part number 3012-916 is a 916 MHz bandpass filter designed for Positive Train Control (PTC) applications. Encapsulated for enhanced shock and vibration resistance, 50 Ω source and load, N(F) to N(M) connectors. The filters are encapsulated/ruggedized for enhanced shock and vibration resistance. Thousands are currently installed and operating successfully in the field with major rail companies. Other frequencies and bandwidths are available ...

Ceramic Foam Ink for 3D Printing of Continuously Variable Properties

Ceramic Foam Ink for 3D Printing of Continuously Variable Properties - RF Cafe"When it comes to design, there is likely no better teacher than nature. While humans have produced an impressive number of gadgets, devices, and systems, most of them are far less efficient and require far more in the way of inputs than nature's designs do. The advent of 3D printing has changed all that, allowing for the possibility of producing objects, with continuously variable properties from a single ..."

Mariner Spacecraft: Explorers of Mars

Mariner Spacecraft: Explorers of Mars, September 1969 Electronics World - RF Cafe"Mariner" was the project name given to NASA's first fleet of interplanetary spacecraft, headed for both Venus and Mars. When Mariner 4 launched for Mars in 1964, it marked the first time mankind had successfully sent a probe to "the red planet." It radioed back Mars surface images at a resolution of 2 miles across. Mariner 4's radio subsystem transmitted data back to Earth at 2300 MHz. Depending on where Earth and Mars are in their orbits, it can take anywhere between 4 and 21 minutes for signals to span the ether between them. That means if a command signal is sent from Earth to a Mars craft and a response is immediately signal sent back to ...

Notable Tech Quote: Thomas Edison

Notable Tech Quote: Thomas Edison - RF Cafe"Chasing the perfect battery is a fool's journey: a catchpenny, a sensation, a mechanism for swindling the public by stock companies," wrote Thomas Edison in 1883. "Working on the latest, greatest battery brings out a man's 'latent capacity for lying." July / August 2017 Discover magazine ...

Visit ConductRF at EDI CON 2017 Booth 528

Visit ConductRF at EDI CON 2017 Booth 528 - RF CafeConductRF invites you to visit their design and sales team in booth #528 at Electronic Design Innovation Conference & Exhibition (EDI CON) in Boston. The event runs September 11-13 at the Hynes Convention Center. ConductRF offers off-the-shelf and custom RF coaxial connector and cable solutions for applications up to 110 GHz ...

Wireless Underwater Charging for UUVs

Wireless Underwater Charging for UUVs - RF Cafe"Unmanned underwater vehicles (UUV) may not require on board crew to operate them, but they do require power. Re-charging used to mean surfacing at the nearest ship or land base. Now, scientists at the Space and Naval Warfare Systems Center Pacific (SSC Pacific) are developing technology that can re-charge UUVs underwater. 'This type of technology is going to widen the array of missions the Navy can use UUVs ..."

RF Cascade Workbook 2018 - 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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Windfreak Technologies Frequency Synthesizers - RF Cafe

Windfreak Technologies Frequency Synthesizers - RF Cafe