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Homepage Archive - January 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.

Homepage Archive Pages

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


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

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Friday 6

Thursday 5

Wednesday 4

Tuesday 3

Monday 2

Sunday 1


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Old Heathkits Never Die, They Just Get Restored

Old Heathkits Never Die, They Just Get Restored - RF CafeThere is no shortage of vintage electronics aficionados who love nothing more than to spend countless hours - and sometimes dollars - restoring and preserving the memory of the products that appeared along the evolutionary path leading to modern electronics. David Goodsell documented his Heathkit EC−1 Analog Computer project on the Nuts & Volts magazine website. He, as do many hobbyists, even stuffed the cardboard cases of the original electrolytic capacitors with modern replacements in order to retain the authentic look. Prices on eBay for some of the vintage equipment has gotten pretty outrageous. He paid more than $400 for this example ...

 

 

 

 

 

 

 

 

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New Phone Design to Facilitate the Shift From 4G to 5G

New Phone Design to Facilitate the Shift From 4G to 5G - RF Cafe"Despite limited space within a single mobile device, one group of researchers has identified a new dual antenna design that could allow phones to access both LTE and 5G networks. With any transition between old and new generations of technology, there are compatibility issues. The transition to 5G wireless communication is no different. One hurdle to be overcome in this transition involves incorporating, within a single phone, new antennas that can support the millimeter wavelengths of signals on 5G networks alongside existing antennas that support the longer wavelengths transmitted by LTE networks. In a new proof-of-concept study ..."

Storing Light in an Integrated Circuit

Storing Light in an Integrated Circuit - RF Cafe"Scientists at the Harvard A. Paulson School of Engineering and Applied Sciences have created a new way to store light in an integrated circuit. The integrated photonics platform also allows them to electronically control the frequency of the light being stored. Scientists believe their new system could have a vast array of applications including microwave photonics, photonic quantum information processing, and optical signal processing, to name a few. Scientists have long hoped to harness microwave signals for such work. Unfortunately, they had always proven to interact far too weakly with electrons to prove effective. That's what led scientists to try a different method, using lithium niobate. This is a material with powerful electro-optic properties ..."

U.S and China in Quantum Physics Arms Race That Will Transform Warfare

U.S and China in Quantum Physics Arms Race That Will Transform Warfare - RF Cafe"In the 1970s, at the height of the Cold War, American military planners began to worry about the threat to U.S. warplanes posed by new, radar-guided missile defenses in the Soviet Union and other nations. In response, engineers at places like U.S. defense giant Lockheed Martin's famous Skunk Works stepped up work on stealth technology that could shield aircraft from the prying eyes of enemy radar. This advantage is now under threat. In November 2018, China Electronics Technology Group Corporation, China's biggest defense electronics company, unveiled a prototype radar that it claims can detect stealth aircraft in flight. The radar uses some of the exotic phenomena of quantum physics to help reveal planes' locations ..."

DARPA to Secure the Electronics Supply Chain

DARPA to Secure the Electronics Supply Chain - RF Cafe"To better protect the global electronics and IT supply chain, the Defense Advanced Research Projects Agency is looking at solutions that can track and authenticate computer hardware components as they are manufactured, shipped and assembled around the globe. Resold and recycled components degrade the reliability and security of many systems used by the Defense Department. The Pentagon has known about the problem for decades and in 2012 issued comprehensive guidance to DOD program and procurement managers to crack down on the problem, with a particular emphasis on electronic parts and components. However, the increasingly complex nature of the global supply chain means that even primary government contractors have difficulty ..."

Quantum 'MESO' Architecture Could Replace CMOS

Quantum 'MESO' Architecture Could Replace CMOS - RF Cafe"Researchers at Intel and UC Berkeley are working on a new transistor technology based on magnetoelectric and spin-orbit materials that offers several advantages over CMOS. According to Ramamoorthy Ramesh, a UC Berkeley professor of Materials Science and Engineering, projections show that the explosion of sensors and computing devices that will constitute the Internet of Things (IoT) - numbering perhaps in the billions - could lead to such an increase in energy demand that electronic devices could comprise as much as 20% of all energy consumed. That's a drastic increase compared with 4-5% today. And just that is enough to justify the search for a new, more energy efficient computing architecture. However, a second challenge has to do with computationally intensive ..."

Metamaterials-Based Satellite Antenna Developed

Metamaterials-Based Satellite Antenna Developed - RF Cafe"Lockheed Martin and Penn State University have developed an innovative antenna technology that is now under consideration for use in next-gen GPS satellite payloads. They worked together to dramatically improve the design of the conventional short backfire antenna by significantly increasing its aperture efficiency (gain), without affecting its rugged and compact design, nor increasing its weight. This type of antenna was originally developed in the 1960s at the Air Force Research Lab. Since then, it has been used in many ground, sea and space applications, perhaps most notably in the communication between NASA and the Apollo spacecraft, and it is still in use on terrestrial communication antenna towers today ..."

Hail the Perovskite Transistors

Hail the Perovskite Transistors - RF Cafe"Researchers have created a field-effect transistor using a single-crystal, 'paint-on' perovskite. Transistors, and the conductive traces that connect them, are routinely created by the billions on the surface of silicon wafers, which are later cut into the individual 'chips' that power our computers, phones, watches, and countless other electronic gadgets. But few people think much about how those silicon wafers are made in the first place. It's quite tricky. Very pure sand (silicon dioxide) has to be melted, at which point a seed crystal of elemental silicon is brought in contact with the melt, which slowly deposits silicon atoms on the seed, ones that extend the seed's crystalline lattice ..."

More Far Side of the Moon Photos from China's YuTu-2 Rover

More Far Side of the Moon Photos from China's YuTu-2 Rover - RF Cafe"Chinese officials on Friday released more imagery from the Chang'e 4 mission, a robotic lander and rover exploring the far side of the moon after a successful landing January 3. The imagery released Friday included a new view of China's Yutu 2 rover captured by a camera aboard the Chang'e 4 lander, a panoramic vista of the austere lunar landscape, and a sped-up video showing the spacecraft’s final descent to the moon from the view of the probe’s descent camera. Chang'e 4 was set to enter a low-power sleep mode Sunday as the sun set on the landing site in Von Karman crater, a bowl-shaped depression measuring around 110 miles in diameter located in the southern hemisphere of the far side of the moon ..."

New GPS Positioning Technology in Tesla Patent Application

New GPS Positioning Technology in Tesla Patent Application - RF Cafe"Looking to enhance accuracy, the concept uses Earth-based cars sharing data and generating corrections. In a patent application filed in 2017 and made public last month, Tesla describes a technology that it believes will result in more accurate GPS positioning. The proposed invention would increase positioning accuracy via determining and applying offsets - corrections - in various ways and sharing this information between vehicles. Tesla describes a system of matching camera data with vision maps to detect the exact location of a vehicle. In essence, the system involves using camera sensors on Tesla EVs to fine-tune the GPS data ..."

 

 

 

 

 

 

 

 

 

 

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About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2018
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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