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Homepage Archive - October 2017 (page 1)

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

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 of the October 2017 homepage archives.

Friday 6

Thursday 5

Wednesday 4

Tuesday 3

Monday 2

Sunday 1

Friday 29

ConductRF Low PIM RF Cable Assembly Solutions for DAS and Cellular


















Empower RF Systems' 1 kW Power Amplifier Tested Tough to MIL STD 810

Empower RF Systems' 1 kW Power Amplifier Tested Tough to MIL STD 810 - RF CafeEmpower's tested and field proven rugged design is common across all our Next Generation Family of amplifiers and is the result of our patented architecture and design goal to minimize RF power losses along the internal signal path, simplify manufacturing and provide for ease of servicing. The consequence of this elegant electro-mechanical compact structural design is a COTS amplifier that is inherently durable. Empower's family of solid state power amplifiers is thermally and structurally designed to meet today's stringent ...

Revised ARRL Frequency Chart Now Available

Revised ARRL Frequency Chart Now Available - RF CafeAn updated ARRL frequency chart is now available for printing and downloading. The chart has been updated to include the new bands at 2,200 and 630 meters. The new chart is available for printing in the following PDF formats: 8.5" x 11" gray scale, 8.5" x 11" B&W, 8.5 x 11 color, and 11" x 17" color ...

KR Electronics Intros 455 MHz BPF for Positive Train Control

KR Electronics Intros 455 MHz Bandpass Filter for Positive Train Control - RF CafeKR Electronics part number 3012-455 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 ... 

No FM Radio in iPhones Decried in Hurricane Aftermath

No FM Radio in iPhones Decried in Hurricane Aftermath - RF CafeHere is a prime example of how a primitive and outmoded form of communication like over-the-air FM broadcast radio can make its value apparent. "FCC Chairman Ajit Pai renewed his call for Apple to activate support for FM radio in its iPhones, citing safety concerns in the wake of a rash of hurricanes. But Apple said some of its latest iPhone models simply can't receive FM broadcasts. Like almost all smartphones, iPhone models include a chip that could enable users to access broadcasts ..."

Pasternack Intros Hi-Rel EM Switches with up to 10M Cycles

Pasternack Introduces New Electromechanical Switches Designed for High Reliability with up to 10 Million Switching Cycles - RF CafePasternack, a leading provider of RF, microwave and millimeter wave products, has unveiled a new series of low insertion loss repeatability electromechanical switches. Test and measurement applications require signal processing component performance to be highly accurate and repeatable over long periods and under extreme conditions. In automated test systems where electromechanical switches are used for signal monitoring and routing applications, every switch will add repeatability error ...













Notable Tech Quote: Elon Musk

Notable Tech Quote: Elon Musk - RF Cafe"I would like to die on Mars... just not on impact." - Elon Musk, SpaceX CEO, during 2013 South by Southwest (SXSW) interview. Begins at 44:15 in video ...







Computer-Designed PC Boards

Computer-Designed PC Boards, October 1969 Electronics World - RF CafeEven in the early days of "computer-designed" printed circuit boards, the software was sophisticated enough to take a circuit net list and perform a rudimentary auto-routing all of metal traces, component solder pads and through holes, using a set of defined design rules for line width and spacing, component size, number of layers, etc. Manual tweaking was usually needed after the initial run, but even today, especially for high frequency PCBs, some manual adjustment is needed to help ensure first-pass success of a layout. According to author Bauer, as many as 22 layers had been accomplished at the time of the article's printing in 1969. Numerically controlled ...

The How and Why of the SCR

The How and Why of the SCR, November 1972 Popular Electronics - RF CafeDid you know that General Electric introduced the first silicon-controlled rectifier (SCR) for commercial use? It was in 1957. The SCR was one of the first really high power devices in the semiconductor industry, not for its voltage and power gain, but for its ability to switch very large currents on and off while have a relatively low "on" voltage drop. This article gets into the basic theory, operation, and application of the SCR. The S-band airport surveillance radar that I worked on in the USAF originally used a vacuum tube thyratron to trigger the magnetron's pulse forming network, but that tube was replaced with a solid state SCR circuit that plugged directly ...

Sibling Startup Movandi Offers RF for 5G

Sibling Startup Movandi Offers RF for 5G - RF CafeMovandi brings innovative RF front end technology to emerging high frequency, millimeter wave networks for 5G and beyond. Internationally recognized siblings, leaders and innovators, Maryam and Reza Rofougaran introduce innovative approach to RF and antenna design, announce new company, Movandi, a venture-backed startup with a mission to revolutionize millimeter wave networks, today announced BeamX technology, a scalable RF front ..."

Advancements in Spintronics

Advancements in Spintronics - RF Cafe"Applications now include nanoscale spintronics sensors that further enhance the areal density of hard disk drives, through MRAMs that are seriously being considered to replace embedded flash, static random access memories (SRAM) and at a later stage dynamic random access memories (DRAM). Spintronics is the concept of using the spin degree of freedom to control electrical current to expand the capabilities of electronic devices ..."

Graphene Forged into 3-Dimensional Shapes

Graphene Forged into 3-Dimensional Shapes - RF Cafe"Researchers from Finland and Taiwan have discovered how graphene, a single-atom-thin layer of carbon, can be forged into three-dimensional objects by using laser light. A striking illustration was provided when the researchers fabricated a pyramid with a height of 60nm, which is about 200 times larger than the thickness of a graphene sheet. The pyramid was so small that it would easily fit on a single strand of hair. The research was supported by the Academy of Finland and the Ministry of Science and Technology of the Republic of China ..."

5G: How Do You Test for a Standard that Doesn't Exist?

5G: How Do You Test for a Standard that Doesn't Exist? - RF Cafe"5G NR is ascending rapidly as the 5G technology of choice, but it turns out lots can be done to get ready as it goes through the formal 3GPP channels. The Qualcomm-led 5G New Radio initiative is accelerating through the 3GPP wormhole and should start emerging as a formal specification in two stages in 2018. But how do we test to it in the meantime? Well, I asked the experts at Keysight. This isn't a new problem, of course. Designers and developers have been ..."

Laser Weapons to Help Defend Tactical Aircraft

Laser Weapons to Help Defend Tactical Aircraft - RF Cafe"Laser weapons experts at Lockheed Martin Corp. are helping the U.S. Air Force develop a compact, ruggedized, high-power laser to defend tactical aircraft flying at or above the speed of sound from enemy aircraft and missiles. Officials of the Laser Division of the Air Force Research Laboratory's Directed Energy Directorate at Kirtland Air Force Base, N.M., announced a $26.3M contract Tuesday to Lockheed Martin Aculight ..."

USAF Intensifies Testing of High Powered Electromagnetic Weapons

USAF Intensifies Testing of High Powered Electromagnetic Weapons - RF Cafe"The Air Force Research Laboratory at Kirtland Air Force Base, N.M., is turning to radio frequency and microwave experts at companies such as Raytheon and Booz Allen Hamilton to conduct experiments with high power electromagnetic (HPEM) technology for such applications as disrupting computers, aircraft, or electric grids. HPEM EW has attracted the attention of the U.S. Air Force's Directed Energy Directorate's ..."

RF Emission Concerns Continue to Thwart Equipment Deployments

RF Emission Concerns Continue to Thwart Equipment Deployments - RF Cafe"As the industry struggles to get small cells and related infrastructure deployed across the U.S., it was reminded that some barriers are about more than aesthetics or registration fees. There's a pending action at the FCC to take another look at RF emissions, and that can be a great shield for local government officials, said Steve Traylor, executive director, National Association of Telecommunications Officers and Advisors, during a panel hosted by Telecommunications Industry Association ..."































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