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- RF Cafe Homepage -
RF, Microwave, Wireless, Cellular, Radar, Satellite, & Analog Engineering

Today in History -  Today is New Mexico Annexation Day. 1834: Aeronautical pioneer Samuel Langley was born. 1868: Willis Whitney, who founded the General Electric research laboratory, was born. 1902: In... more

-- Tech Headline News --
<Archives>

Global Amateur Radio Emergency Communications Conference 2014 Takes a Technological Tack

GaAs IC Market to Grow to $8B in 2017

Roaming Regs to Impact on IoT, M2M Markets

Clues to Role of Magnetism in Iron-Based Superconductors

Silicon Valley Venture Capital Still a Man's World

Huawei and DoCoMo Test LTE Services in the 5bGHz Spectrum Band

Discovery Suggests Surprising Uses for Common Bubbles

Hacking Gmail with 92% Success

FCC Studies Spy Towers

Class Action Against Facebook Attracts 60,000 Users

First Direct Evidence of 'Spin Symmetry' in Atoms

3 Radars are Better Than 1

HotSpot Beacon Solution Aims to Prevent Parking Tickets

Telecom Penetration in Remote Areas Creates Opportunities for Hybrid Power Systems

eBay Considering PayPal Spinoff

Les Paul: Technician
and Musician

Les Paul: Technician and Musician, October 1958 Radio-Electronics - RF CafeLester William Polsfuss is credited with being a major player in the pioneering of electric guitars with his solid-body (no acoustic resonance chamber) model... but you probably knew that. As if being a popular musician and, along with wife Mary Ford, selling millions of records wasn't enough, Les Paul was an experimenter and inventor in the electronic music realm. Here is what was at the time a contemporary look inside his home-workshop-studio. Mr. Polsfuss designed and built the record cutter that he used in his early days out of scrounged automobile...

Anatech's August Newsletter
Covers Current Events

Anatech ElectronicsAnatech Electronics, a manufacturer of RF and microwave filters, has published its August 2014 newsletter. As always, it includes both company news and some tidbits about relevant industry events. This month, Sam Benzacar offers his views on the subjects of Fiber: Too Slow for Wall Street, NASA Examines Microwave Propulsion, Report: Northeast Has "Fastest" Broadband. It also pays tribute to Dr. Norman Abramson, founder of ALOHAnet as part of his theme on "Wi-Fi's Changing the Wireless Playbook."

Many Thanks to KR Electronics
for Long-Time Support

KR ElectronicsFor over 40 years KR Electronics has designed and manufactured high quality RF & microwave filters for the commercial and military markets. KR Electronics manufactures all filter KR Electronics SMT filterstypes and individually synthesizes filters for special applications. State of the art computer synthesis, analysis and test methods are used to meet the most challenging specifications.

Microwave Engineering
Crossword for August 17, 2014

Microwave Engineering Crossword Puzzle for August 17, 2014 - RF CafeEvery Sunday I create an engineering-themed crossword puzzle using a word list that I personally created and added to during over a decade of making puzzles. All of the words are related to engineering, science, mathematics, chemistry, astronomy, etc. There are no numbnut clues about movie stars or clothing designers. Enjoy.

Aviat Networks Needs
Director of Systems & Services

Aviat Networks Looking for a Director of Systems & Services, North America - RF CafeThanks to our 50 years of industry experience, Aviat Networks knows microwave transmission better than anyone, and now we are delivering the next generation of LTE proven microwave networking solutions that bring together high performance radio transmission and smart network evolution to all-IP. Aviat has an opening for a Systems & Services Networks Director, responsible for developing and executing a services strategy that supports the existing customer business and the sector's growth strategy. Please see description for details if interested...

Please Thank IPP
for Their Support!

Innovative Power ProductsInnovative Power Products has more than 30 years of experience designing and manufacturing RF passive components. 90-degree CouplerOur couplers, combiners, baluns, resistors, and terminations incorporate the latest technology in materials available, which equates to unrivaled product performance.

Frontiers in Antennas: Next
Gen Design & Engineering

Frontiers in Antennas: Next Generation Design & Engineering - RF Cafe Featured BookFrontiers in Antennas: Next Generation Design & Engineering, by Frank Gross. Edited by one of the world's foremost authorities on smart antennas and featuring contributions from global experts, Frontiers in Antennas discusses the latest advances in antenna design and engineering. This pioneering guide deals primarily with frontier antenna designs and frontier numerical methods. Many of the concepts presented have emerged within the last few years and are still in a rapid state of development. Each chapter provides in-depth details on a unique and modern antenna technology.

Many Thanks to Cobham
Antenna Systems for Support

Cobham Antenna SystemsSpecialising in the design and development of high gain, printed circuit arrays, ultra wide-band directional antennas, multi-Omni 3D radiation pattern - Cobham Antenna Systemsoctave bicones and high gain collinear omni-directional antennas. Large catalogue of antenna designs. Specialist development projects from 250 MHz to 40 GHz. Communication industry awareness and expertise in antenna physics ensure customer satisfaction.

Sylvania News
Radio Service Edition

Sylvania News Radio Service Edition, September 1945, Radio Craft - RF CafeOnce mobile and other high-vibration and impact operational environments became the norm for communications, it became necessary to design hardware so that electronic components would not work themselves loose and cause intermittent or total failure. With vacuum tubes, placing locking shields over them did the job, but that caused other issues such as increased cost, poor cooling, and increased chassis size and weight. Some circuits with high power and/or frequency benefited from shields, but most did not need them. Sylvania introduced a scheme called "Lock-In" (trademark name of "Loktal")where the center pin incorporated a circumferential groove that latched into a capturing mechanism. It was strong enough...

Radar Principles Part II
Historical Development

Radar Principles, May 1945 Radio Craft - RF CafeThis second part of the "Radar Principles" article by British engineer and researcher Dr. R.L. Smith-Rose provides a historical perspective of the very beginnings of radar systems. Although alluded to by technical visionaries like Hugo Gernsback, George Orwell, Jules Verne, H.G. Wells, et al, for use in target detection and ranging (but rarely speed, oddly enough). According to Dr. Smith-Rose, the first use of radio waves for detection and distance measurement was in atmospheric studies to characterize the ionosphere, in a bistatic configuration. It is an interesting and quick read, and you might even be introduced to the concept of a "squegging" (self-quenching)...

A Radial-Beam Tube

A Radial-Beam Tube, August 1944, Radio Craft - RF CafeSignal multiplexing was originally performed using a rotating mechanical device with commutator contacts. Such a contraption suffered from a number of limitations including contact wear, noise, speed, size and weight. Probably the most limiting were contact wear and switching speed. Bulk could be accommodated because back then everything was bulky. Standard vacuum tube switches were eventually used to build multiple (n) input / multiple (m) output switching circuits, but the space needed to contain them grew exponentially with the...

ADF 2014 Registration Opens
for India Locations

ADF 2014 Agenda Set, Registration Opens for India Locations - RF CafeNI (formerly AWR Corporation) has added three locations in India during the first week of September to its 2014 AWR Design Forum (ADF) tour. The event agenda has been set and registration is now open. Agenda highlights include: New Innovations and Technologies in the NI AWR Design Environment™ Microwave Cavity Filter Design Transceiver Module and Multi-Element Phased Array Design Cree GaN Models and Process Design Kit for First Pass MMIC Designs RFIC Design 3D EM Simulators for PCB Design...

Pasternack Releases New
High Isolation RF Switches

Pasternack Releases New High Isolation RF Switches - RF CafePasternack Enterprises, an industry-leading manufacturer and supplier of RF, microwave and millimeter wave products, debuts an entirely new family of high isolation PIN diode switches consisting of three low insertion loss, high isolation and high speed modules, covering a frequency range of 1 to 12 GHz. When signal integrity and performance are a critical component of system functionality, the higher the isolation figure, the better the overall performance will be...

A Handful of Techie Jokes 

LOL - RF Cafe...well, a human handful with a complete compliment of four fingers and a thumb. I have no idea who first thought of these jokes, but thanks to whoever did. I especially like the iPod joke

Werbel Microwave's 2.2-2.3 GHz
180-Degree Hybrid Coupler

Werbel Microwave Intros 2.2-2.3 GHz 180-Degree Hybrid Coupler - RF CafeWerbel Microwave is developing a standard line of narrowband 180-degree hybrids. A signal applied to the sum port produces two outputs of equal amplitude and phase, while a signal applied to the delta port produces output signals of equal amplitude but opposite phase. The model 2Q11 was designed to fulfill a custom requirement from 2.2-2.3 GHz. Measured return loss was 1.2:1 or better, 25 dB isolation and 0.3 dB insertion loss. Phase balance was within ±5 degrees...

Using a Balanced Aerial System
to Eliminate Interference

Using a Balanced Aerial System to Eliminate Interference, October 1932 Radio News - RF CafeQRM and QRN (manmade and natural interference, respectively) has been a problem to be dealt with since the beginning of radio communications. Amplitude modulation (AM) was and is still the most vulnerable because there are so many sources of electrical and electromagnetism generation - both intentional and unintentional. Filters can take care of out-of-band noise, but inband noise needs to be dealt with differently. Some inband interference can be reduced in effectiveness with circuits using specific time constants that address specific noise types. One of the most successful methods for mitigating generic noise is to limit the opportunity for noise signals to enter the system by employing directional antennas...

Radios Serviced by Observation

Radios Serviced by Observation, September 1945, Radio Craft - RF CafeAnyone who has done a lot of electronics troubleshooting - especially on a wide variety of hardware - knows that proficiency depends on acquiring a 'feel' for how things ought to be. An oft-given example is that bank tellers and store clerks are taught to spot counterfeit bills not by showing them what all the different phony currency looks like, but what real money looks like. That way, anything that does not look familiar is readily apparent. The same philosophy has served technicians and engineers well since the beginning of electrical and electronic circuits. The more senses that can be drawn upon to facilitate troubleshooting, the more quickly you are likely to pinpoint the problem. Depending on the symptoms of the failure, sniffing the assembly for toasted or...

Men Who Made Radio -
Sir Oliver Lodge

Radio Craft magazine ran a monthly series of short articles paying tribute to some of shakers and movers in the field of science - this time it was Sir Oliver Lodge. "While Hertz was discovering radio waves in air, Lodge was determining the laws of the corresponding activity which takes place in electrical conductors. It was Lodge who demonstrated the possibility of radio communication, experimentally, as Marconi did its commercial value - just as Henry created the telegraph and Morse made it of practical utility."

Notable Tech Quote

Nikola Tesla predicting radar - RF Cafe"Stationary waves in the earth mean something more than mere telegraphy without wires to any distance. They will enable us to attain many important specific results impossible otherwise. For instance, by their use we may produce at will, from a sending-station, an electrical effect in any particular region of the globe; we may determine the relative position or course of a moving object, such as a vessel at sea, the distance traversed by the same, or its speed; or we may send over the earth a wave of electricity traveling at any rate we desire. " - Nikola Tesla describing a future technology called radar. "The Problem of Increasing Human Energy," The Century, 1900.

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