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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
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 ...

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

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"In the fields of observation, chance favors only the prepared mind." - Louis Pasteur"

Today in Science History

Ionotronic Memory?

Ionotronic Memory? - RF Cafe"Researchers at Aalto University in Finland have discovered large uniform reversible changes in electrical resistance as oxygen ions migrate in an oxide material. The discovery could open a route to ionotronic memories. Aalto University ion migration probe It transpires that potential difference drives oxygen ions away from one electrical contact, causing an abrupt change in oxide lattice structure and an increase of electrical resistance. Reversal of the voltage polarity fully restores the original material ..."

Single Atomic Layer Semiconductors Get Within Reach

Single Atomic Layer Semiconductors Get Within Reach - RF Cafe"Semiconductors, as thin as a single layer of atoms, are no longer a dream of the future: Researchers in Germany, the United States and Poland have together developed a two-dimensional material that could revolutionize electronics. Its semiconducting properties make this material appear suited for advanced applications even much better than graphene. The new material, introduced to the public in the scientific magazine ACS Nano ..."

Amateur Radio Balloon Part of 2017 National Scout Jamboree

Amateur Radio Balloon to Be Part of K2BSA Activities at 2017 National Scout Jamboree - RF Cafe"A high-altitude Amateur Radio balloon, K2BSA-11, will be launched from the 2017 National Boy Scouts of America Jamboree in West Virginia. The balloon is expected to reach an altitude of 48,000 feet and will transmit on 144.390 MHz APRS. An onboard GPS/computer will shift APRS frequencies based on the balloon’s location around the globe. Carrying out the July 20 launch from the Summit Bechtel Reserve will be Bill Brown WB8ELK; Keith Kaiser, WA0TJT, and other members of the K2BSA Radio Scouting team. They are hoping that the balloon will ..."

R.F. Energy Powers Incandescent Lamp

R.F. Energy Powers Incandescent Lamp, April 1956 Popular Electronics - RF CafeWireless power distribution has been in the news a lot for the last couple years. It began with a goal of just wirelessly charging mobile devices like cellphones, smart watches, and tablet computers. Next came articles about charging electric cars wirelessly while sitting in a parking lot or garage, or even at a stop light. In each instance, the item being charged needed to sit in close proximity to an electric induction coil to be effective. Just a couple days ago, however, a new item ...

Z-Communications Intros Fixed Frequency 990 MHz PLO

Z-Communications Intros Fixed Frequency 990 MHz PLO - RF CafeZ-Communications announces a new Fixed Frequency Synthesizer model SFS0990C-LF. The SFS0990C-LF is a preprogrammed synthesizer that is phase locked at 990 MHz to an external 10 MHz reference oscillator. This PLL features an exceptionally low typical phase noise of -119 dBc/Hz at 10 kHz, -100 dBc/Hz at 1 kHz, and -141 dBc/Hz at 100 kHz offsets. The RoHS compliant SFS0990C-LF is designed to deliver a typical output power of +1 dBm ...

Please Visit Triad RF System to Thank Them for Their Support

Triad RF SystemsTriad RF Systems designs and manufactures RF power amplifiers and systems. Triad RF Systems comprises three partners (hence 'Triad') with over 40 years of accumulated knowledge of what is required to design, manufacture, market, sell and service RF/Microwave amplifiers and amplifier systems. "We view Triad more as a technology partner than a vendor for our line-of-sight communications product line." Please check to see how we can help your project ...

Xilinx Integrates Analogue RF into MPSoCs

Xilinx Integrates Analogue RF into MPSoCs - RF Cafe"Xilinx has integrated RF-class analogue technology into its 16nm MPSoCs resulting in a family of RFSoCs which eliminate discrete data converters resulting, claims Xilinx, in a 50-75% power and footprint reduction for 5G massive-MIMO and millimeter wave wireless backhaul applications. Xilinx Large scale 2D antenna array systems will be key to the increase in spectral efficiency and network densification needed for 5G ..."

India's New Network of Radio Broadcasting

India's New Network of Radio Broadcasting, April 1938 Radio-Craft - RF CafeWhen this story was written in 1938, India was a country of roughly 2 million square miles, while the 48 United States had about 3.1 million square miles. Radio station growth in the U.S. already had a 3-decade head start in establishing a nationwide network of broadcast and receiving stations. Manufacturing of the required equipment was well established within our borders. India, by contrast, relied heavily on outside sources for equipment and the training of operators and servicemen. The U.S. never has ...

Telephones Will "Ring" with Musical Tones

Telephones Will "Ring" with Musical Tones , April 1956 Popular Electronics - RF CafeIf you thought that custom ringtones have only been around since the mobile phone, you will be surprised to learn that according to this news brief in a 1956 issue of Popular Electronics, Bell Telephone Labs was experimenting with such features. Bell was exploiting the convenience, small size, and relatively inexpensive transistor to enable customers with deeper pockets to her something other than the standard mechanical bell ringer. The irony is, of course, that some people nowadays use a ringtone in their smartphones that sounds ...

Elegoo Mega 2560 Arduino Project Kit

Elegoo Mega 2560 Arduino Project Kit - RF CafeArduino has been a sensation in the techie world for about a decade now. Not too long ago electronics 'starter kits' consisted of a battery, a solderless breadboard, a handful of Rs, Ls, and Cs, LEDs, a neon bulb, a couple simple ICs and transistors, and some jumper wires. Compare that to this kit with an Arduino microcontroller and code IDE, LCD, joystick, remote controller, motion and ultrasonic sensors, stepper motor controller, keypad, RFID module, and much more PLUS all the SainSmart DIY Control Palletizing Robot Arm Model for Arduino UNO - RF Cafestuff you got with the old type starter kits - all for a paltry $60 (equiv. to $15 in 1977). Many add-ons available like an übercool robotic arm ...

Modular 5G Antenna Stacks for High Data Rate

Modular 5G Antenna Stacks for High Data Rate - RF Cafe"The new antennas – including the 5-6 GHz Adaptrix CMM200.A – feature a patent-pending, modular interlocking system to help operators scale capacity – when more capacity or speed is needed at a location, another module is clipped to the side of the existing installation. This first-in-the-industry antenna system means that when you need to add capacity, you simply attach extra panels. You can build them up vertically or horizontally like Lego blocks. You don't need to worry about spacing, alignment or ..."

Wi-Fi Certified Location™ Brings Wi-Fi® Indoor Positioning

Wi-Fi CERTIFIED Location™ Brings Wi-Fi® Indoor Positioning - RF Cafe"Wi-Fi feature delivers indoor navigation, asset tracking, and network management. Wi-Fi® now includes advanced capabilities that bring location determination indoors to meet growing market demand for mobile location-based services. Wi-Fi CERTIFIED Location™ brings the same great user experience indoors as is expected from outdoor location-based services (LBS), and enables the creation of new, feature-rich applications and services that will benefit many markets including ..."

Thank Maxwell for Cellphones

Thank Maxwell for Cellphones - RF Cafe"Now that the world has become addicted to portable electronics, billions of people have come to see the companies providing these gadgets as the most innovative, and the people who head those companies as the most exalted, of all time. 'Genius' is a starter category in this discussion. But clever and appealing though today’s electronic gadgets may be, to the historian they are nothing but the inevitable fifth-order elaborations of two fundamental ideas: electromagnetic radiation, the theory of which was formulated by James Clerk Maxwell in the 1860s ..."

TV Show Features "Wires and Pliers"

TV Show Features "Wires and Pliers", April 1956 Popular Electronics - RF CafeWhen I first saw this picture of Dr. Martin L. Klein, I though he was Superman. No, it doesn't take a superman to teach electronics on television, but the familiarity of George Reeves as the star of the "Adventures of Superman" series in from 1953 through 1958 would have been a good reason to use him in the "Wires and Pliers" TV show. Dr. Klein and his techie sidekick Aram Solomonian performed a weekly show presenting basic electronics to the audience. BTW, as long as I am ...

EE Shows off Helium Balloon Mobile Masts

EE Shows off Helium Balloon Mobile Masts - RF Cafe"Mobile phone provider EE has demonstrated helium balloons and drones that could provide 4G mobile coverage following damage to existing infrastructure. The devices are fitted with small mobile sites that include a base station and an antenna. They could also be used to connect remote parts of the UK where coverage is thin. EE said it planned to deploy such a network in a UK rural area this year. The drones can stay airborne for up to an hour at a time and the "helikite" balloons for several weeks as they have ..."

RF Stencils for Visio v3 New Release - RF Cafe

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

Local Police Departments Invest in Cell Phone Spy Tools

Cree Terminates Sale of Wolfspeed to Infineon Following CFIUS' Security Concerns

Radio Dominates in Connected Cars

Indian IoT Market Value to Touch $9B by 2020

Optical Clocks Hit the Road

5G Worth More to UK Economy Than Fibre by 2026

Liquid Metal Nano Printing Set to Revolutionize Electronics

Why Millennial Engineers Must Build a Business

Altair Readies Cellular IoT IC with GPS Inside

Nokia Delivers World's First 5GTF Connection

Nokia Delivers World's First 5GTF Connection - RF Cafe"Nokia has successfully implemented the world's first connection based on the 5GTF (5G Technology Forum) 'pre-standard', marking a further milestone in Nokia's momentum to make 5G a commercial reality. The test adds another key component to the development of 5G and the implementation of the first 5G applications, demonstrating the ability to provide fast pace implementation based on early standards including device ..."

Anatech Electronics Newsletter - February 2017

Anatech Electronics Newsletter for February 2017 - RF CafeAnatech Electronics, a manufacturer of RF and microwave filters, has published its February newsletter. As always, it includes both company news and some tidbits about relevant industry happenings. In it, Sam Benzacar discusses, among other topics, the continuing and even growing problem of passive intermodulation (PIM) products that are generated at the contact point of dissimilar metals - particularly where corrosion is present - and the resulting nonlinear junction. Even coaxial cable connectors than have the same type of plating can develop scratches ...

Engineering Career and Job Hunting Advice for February 2017

Engineering Career and Job Hunting Advice for February 2017 - RF CafeWhile looking around the Web for good job search and career enhancement articles, an article by The Savvy Intern's Lauren Kirkpatrick titled "Millennial Stereotype Busted: 'Paying Your Dues' is Bullsh*t," struck a chord. It's a short piece and, as you might guess from the title, somewhat naively attitudinal (a 2013 graduate). However, she does bring up a good point about how the world has changed from even as recently as the 1980s when I first hit ...

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Astronomers Propose Cellphone Search for Galactic Fast Radio Bursts

Astronomers Propose Cellphone Search for Galactic Fast Radio Bursts - RF Cafe"Fast radio bursts (FRBs) are brief spurts of radio emission, lasting just one-thousandth of a second, whose origins are mysterious. Fewer than two dozen have been identified in the past decade using giant radio telescopes such as the 1,000-foot dish in Arecibo, Puerto Rico. If [an FRB occurred in out galaxy], astronomers suggest that it would be 'loud' enough that a global network of cell phones or small radio receivers could 'hear' it. The search for nearby ..."

Collins Builds VLF Comms for B-2 Stealth Bomber

Collins Builds VLF Comms for B-2 Stealth Bomber - RF Cafe"Military communications experts at the Rockwell Collins Government Systems segment in Cedar Rapids, Iowa, are starting full-rate production of a secure and jam-resistant very low frequency (VLF) radio for the U.S. Air Force B-2 stealth bomber to enable the aircraft crew to communicate with national command authorities while on long-range missions. Officials of the Air Force Life Cycle Management Center at Wright-Patterson Air Force Base, Ohio, are awarding a $12.9M ..."

Lossless Metamaterial Could Boost Efficiency of Lasers

Lossless Metamaterial Could Boost Efficiency of Lasers - RF Cafe"Engineers at the University of California San Diego have developed a material that could reduce signal losses in photonic devices. The advance has the potential to boost the efficiency of various light-based technologies including fiber optic communication systems, lasers and photovoltaics. The discovery addresses one of the biggest challenges in the field of photonics: minimizing loss of optical (light-based) signals in devices known as plasmonic metamaterials ..."

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