Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Manufacturers & Services Consultants Engineer Jobs Twitter LinkedIn Advertise on RF Cafe! Engineering Books Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar Day in History RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Bookstore Calculators Education Engineering Organizations Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings Advertisers Websites RF Cafe Archives Test Notes Slide Rules RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

RF Cafe Software

RF Cascade Worbook
 RF Cascade Workbook 2005 - RF Cafe
Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
RF & EE Symbols Word
RF Stencils for Visio

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger
BSEE
KB3UON
EIEIO

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

- Welcome to the RF Cafe Website -
"Real radios glow in the dark" - Ed Mustoe (referring to tube types)

Today in Science History

Tech Headline News
All the News Fit to Link™

- Archives -

More 5G Spectrum Coming Soon, FCC Chair Says

¼ of Millennials Are OTT-Only Broadband Households

'Space Tsunami' Causes the 3rd Van Allen Belt

Bluetooth Steps Beyond PAN

Atomic Clocks in Space Could Detect Gravitational Waves

National Association of Broadcasters Breaks Ground on New HQ

RF Power Semi Market to Grow 15.4% CAGR, Almost 3x over 2015

Wi-Fi-Powered Electronics: Nikola Tesla's Dream Realized

China's 93 Petaflop Sunway TaihuLight is World's Most Powerful COmputer

Egypt Offers Additional Telecoms Licenses to Incumbents

DARPA MMIC-Scale EM Components for Military RF & Microwave

DARPA Monolithic-Scale Electro-Magnetic Components for Military RF and Microwave Systems - RF Cafe"U.S. military researchers are trying to do for magnetic components what they've done for MMICs - develop them on semiconductor substrates to reduce their size and enable new functionality for military RF and microwave systems. Officials of the U.S. Defense Advanced Research Projects Agency (DARPA) issued a broad agency announcement on Thursday (DARPA-BAA-16-36) for the Magnetic Miniaturized and Monolithically Integrated Components (M3IC) project ...

EM Research White Paper: Ruggedization

EM Research White Paper: Ruggedization - RF CafeEM Research just released a white paper titled, Survival Skills: Ruggedization - How to Ensure Performance Under the Toughest Conditions in 5 Steps. "It contains  Extreme heat, extreme cold, the pervasive moisture of being at sea, the constant vibration of revving engines – these are all factors that can destroy complex communications components. Unless, of course, they've been ruggedized to endure the toughest conditions ...

Ford-Philco Car-Radio Models F-1440 and F-1442

Ford-Philco Car-Radio Models F-1440 and F-1442, August 1937 Radio-Craft Radio Service Data Sheet - RF CafeMost of the earliest automobile radios had the electronics mounted in a metal box separate from the dashboard tuning dial. The bulk and weight prevented colocation. This 1937-Ford-Philco Car-Radio F-1442 - RF Cafevintage Ford-Philco F-1442 radio one for which I was able to locate a couple examples for sale on eBay. One claims to be fully functional and the other is in pretty rough shape. If your era car or truck came without a radio and you would like to finally upgrade, this is your opportunity ;-) Here are the 3 other Radio Service Data Sheets from the August 1937 Radio-Craft: General Electric FA-60 and FA-61, Howard Model B-5 (715), and Remler Model 46 "Scottie."

The Truth About the Vertical Antenna

The Truth About the Vertical Antenna, May 1952 QST - RF CafeWhenever you see an article with "The Truth About..." in the title, the expectation is the author is going to reveal some aspect about the subject that has been kept from public knowledge by nefarious schemers, or a common misconception is going to be cleared up for the unwitting majority. This article comes closest to the later category, although it is not really clear to me after reading it what the newly revealed 'truth' is - maybe just that the effort required for using a vertical antenna at fairly long wavelengths is worth it because of low radiation angles that facilitate local area and relatively nearby communications. A lot of really good information is presented regarding vertical antenna field patterns, antenna installation, and feedline ...

EDI CON USA Announces 4 Courses on RF, Microwave, HS Digital Design

EDI CON USA Announces Four Short Courses on RF, Microwave, and High-Speed Digital Design - RF Cafe
EDI CON USA 2016, a conference that brings together engineers working on high-frequency analog and high-speed digital designs, taking place September 20-22 in Boston, Mass. at the Hynes Convention Center, is pleased to announce a full line up of short courses available to conference attendees. The short courses will take place in the afternoon on the third day of the conference, Thursday September 22, 2016. They are included in the conference pass type for attendees and no additional registration is required. Intuitive Microwave Filter Design ... 

Space Command Readies for War with 'Space Enterprise Vision'

Space Command Readies for War with 'Space Enterprise Vision' - RF Cafe"Air Force Space Command has created a blueprint for fighting and winning wars in space, known by the innocuous title of the Space Enterprise Vision. The existence of the plan is not classified but many of its working elements are. The SEV is 'an all-encompassing look at all the things we need to do to create more resilience in our space forces, enhance them, and respond to threats,' Air Force Space Command spokesman Col. John Dorrian says. It includes current weapon systems and those planned for the near ...

Author: Kirt Blattenberger on Google+ Author:
Kirt Blattenberger

Southern California Amateurs Rise to Earthquake Emergency

Southern California Amateurs Rise to Earthquake Emergency, May 1933 QST - RF CafeThis could be a headline for today, tomorrow, or from 83 years ago. It was the latter, following the magnitude 6.4 earthquake that hit the Long Beach, California region. Per Wikipedia, "An estimated $40M worth of property damage resulted, and between 115 and 120 people died. Many of these fatalities occurred as people ran out of buildings and were hit by falling debris." That paled, though, in comparison to the magnitude 7.8 San Francisco earthquake in 1906, where massive destruction occurred and upwards of 3,000 people died. As usual, radio amateurs were some of the first emergency responders ...

Mac's Radio Service Shop: Barney and the Boosters

Mac's Radio Service Shop: Barney and the Boosters, June 1949 Radio & Television News - RF CafeAs one who recently installed an outdoor antenna with a signal booster on it, I definitely considered whether my exercise and investment would be worthwhile because all the preamplification in the world wouldn't help if the signal-to-noise ratio was lousy to begin with. This statement from Mac McGregor sums it up well, "One thing you have to remember is that the booster has to have something to boost. Unless the antenna can deliver some sort of signal to it, it has nothing to work on. The results are about the same as when a small boy reaches the bottom of his soda. He keeps on trying, but about all his straw delivers is noise ..."

Tips on Technology for Experts in the Courtroom

Tips on Technology for Experts, by IMS ExpertServices - RF CafeWendy Pearson, writing for IMS ExpertServices, offers this article summarizing an expert witness' use of presentation technology in the courtroom - 3D printers, computer simulations, animated graphics, etc. It is hard to believe that in the year 2016 there are still judges that restrict use of high tech methods in the courtroom, but evidently it is so. Anyone old enough to remember when design reviews, seminar speeches, and other presentations to customers and peers consisted of overhead projectors, hard copy handouts, and occasionally a physical sample to pass around to the audience was stand operating procedure, can testify to the vast improvement realized by ...

EU to Spend €1B to Turn Quantum Physics Into Quantum Technology

Europe Will Spend €1 Billion to Turn Quantum Physics Into Quantum Technology - RF Cafe"A 10-year-long megaproject will go beyond quantum computing and cryptography to advance other emerging technologies This dilution refrigerator can cool quantum dots to less than 5 millikelvins for experiments in quantum computing. European quantum physicists have done some amazing things over the past few decades: sent single photons to Earth orbit and back ..."

FCC Proposes 200-MHz Blocks of High-Band Spectrum for 5G 

FCC Proposes 200-MHz Blocks of High-Band Spectrum for 5G - RF Cafe"Federal Communications Commission (FCC) chairman Tom Wheeler this week talked up the role of the U.S. in the development of the fifth generation of mobile technology and proposed new rules designed to free up more spectrum for 5G. FCC commissioners will vote on the proposal on 14 July, Wheeler said in a speech delivered to the National Press Club on Monday, and reproduced on the U.S. regulator's Website. '5G is a national priority,' Wheeler said, having waxed lyrical about the possible applications ..."

The Mechanics of Modulation

The Mechanics of Modulation, October 1931 QST - RF CafePaul Huntsinger wrote a nice introductory article on amplitude modulation (AM) in a 1931 edition of QST magazine. At the time, frequency modulation (FM) was still a laboratory curiosity, and many 'experts' believed that FM would not provide any advantage over AM broadcasting. You might be tempted to think that sources of electrical noise that would interfere with AM were less at the time, thus negating the need for noise-immune FM, but the fact is by 1931 there was a lot of static caused by brushed motors, lousy automobile ignition systems, and arcing transmission lines, along with natural sources like lightning. Figures 6, 7, and 8 were missing in the original article, but fortunately I was able ...

China's BeiDou Navigation Satellite System to Have 35-Satellites by 2020

China's BeiDou Navigation Satellite System to Have 35-Satellites by 2020 - RF Cafe"China's homegrown navigation system, the BeiDou Navigation Satellite System (BDS), will cover the whole globe with a constellation of 35 satellites by 2020, said a government report on Thursday. By 2018, the system is expected to provide basic services to the nations along the Belt and Road, as well as neighboring countries, said a white paper on the BDS issued by the State Council Information Office. China aims to build ..."

1 in 15 New Cars to Use Infineon SiGe 77 GHz Radar Chips by End-2016

1 in 15 New Cars to Use Infineon SiGe 77 GHz Radar Chips by End-2016 - RF Cafe"By the end of 2016, more than half of all new automotive 77 GHz radar systems worldwide will be equipped with chips from Munich-based Infineon Technologies, meaning that about one in 15 new cars will use a driver assistance system using its 77 GHz radar chips, says the firm. Infineon's market leadership in the rapidly growing market for radar chips for driver assistance systems was recently confirmed by market research firm IHS Technology. While Infineon has sold a total of 20 million radar chips in the past few years ...

Morsecorp Develops Unmanned Aircraft That Melt

Morsecorp Develops Unmanned Aircraft That Melt - RF Cafe"U.S. military researchers have chosen a third company to develop small unpowered and unmanned aircraft to air-drop small packages for forward-deployed forces. After delivery, the unmanned aircraft melt without any detectable trace to keep them out of enemy hands. Officials of the U.S. Defense Advanced Research Projects Agency (DARPA) in Arlington, Va., added MORSECORP Inc. in Cambridge, Mass., to the Inbound, Controlled, Air-Releasable, Unrecoverable Systems (ICARUS) ..."

VidaRF Offers Wide Selection of Power Dividers/Combiners

VidaRF Offers Wide Selection of Power Dividers/Combiners - RF CafeVidaRF offers a wide selection of 2-way through 16-way power divider / combiners, designed to cover 100 MHz to 20 GHz with average power handling of 30 watts for narrow, octave, dual and multi-octave band applications. Standard Connector type: SMA female, other connectors available upon request. VidaRF is a North Carolina based company that is focused on being a solutions provider by building to customer specs and offering zero days lead time for custom parts through their stock ...

Revolution in the Pythagoras Theorem?

Revolution in the Pythagoras Theorem? - RF Cafe"The Pythagoras theorem has changed. Better yet, our understanding of it has changed from two dimensions to three dimensions. For the past 2500 years, the Pythagoras theorem, arguably the most well-known theorem in the world, has greatly helped mankind to evolve. Its useful right angles are everywhere, whether it is a building, a table, a graph with axes, or the atomic structure of a crystal. What does it look like in 3D? Until now, this ..."

The Reception of Single-Sideband Signals

The Reception of Single-Sideband Signals, November 1952 QST - RF CafeEven though the concept could easily be demonstrated to be viable mathematically, single sideband operation was early on widely regarded as an unrealizable laboratory curiosity, especially with a suppressed carrier. More circuitry is of course needed to accomplish single sideband communications both on the transmit and receive sides, but other than stricter stabilities and precision for frequency sources, single sideband operation is easily obtainable. There still remains a debate over whether voice quality is as good versus ...

Under a Telephone Pole, by Carl Sandburg

Under a Telephone Pole, by Carl Sandburg - RF Cafe"There is no new thing under the sun." "Everything old is new again." Many such idioms exist regarding how often things tend to run in cycles; it's just that often times people who think they are witnessing a new phenomenon are not aware of the previous occurrences. I have written of examples where 'old timers' lament the attitudes of a fledgling work force when writings show the previous generation of 'old timers' who worked with the current 'old timers' in their youth expressed the same type concern. An article titled "OMG! We've Been Here B4," appeared in the March 2016 issue of Smithsonian magazine ... 

LBA Technology Debuts New AM Tower Isocoupler Hardware

LBA Technology Debuts New AM Tower Isocoupler Hardware - RF CafeLBA Technology (LBA), a unit of LBA Group, Inc. announced the next generation of economical AM isocoupler hardware for collocating low power broadcast facilities on AM towers. The LBA research and development team has improved upon the long trusted CAMI™ and CAMIMAX™ with the release of the new CAMI500™, CAMI1800™, and CAMI5000™. While the three new models replace the CAMI™ and CAMIMAX™, LBA will still support the legacy models which are in use around the world. This new line of AM isolation solutions creates more options and opportunities for AM broadcasters to use or offer ...

Try Using SEARCH to Find What You Need.  >10,000 Pages Indexed on RF Cafe !

Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON
Family Websites:  Airplanes and Rockets | Equine Kingdom

All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.