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Click here to read about RF CafeView the YouTube RF Cafe Intro VideoKirt Blattenberger ... single-handedly redefining what an engineering website should be.

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

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My daughter Sally's horse riding website

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- Welcome to the RF Cafe Website -
"The very term VCs sounded sinister. The only other VCs I'd ever known were the Viet Cong." - - Jerry D. Neal, RFMD

Today in History

Tech Headline News
All the News Fit to Link™

- Archives -

NASA's Passive Wi-Fi Saves 80% Power

Lockheed Martin Begins Layoffs at NORAD

Reservoir of Ultracold Atoms Filled Continuously

'Plasmonic' Material Could Bring Ultrafast All-Optical Communications

Politics Overshadows U.S. Tech Firms' Hopes for Entering Iran (pesky things like being world's largest supporter of terrorism)

World's 1st White Lasers Demonstrated

Japan Develops 2 Petawatt 'Death Star' Laser

GaN Gaining Traction

GaN-on-Silicon LED Solution Arrives

Facebook Builds Drone for Internet Access

Samsung's Slippage Stirs Smartphone Angst

Sol-Gel Capacitor Dielectric Offers Record-High Energy Storage

Meet Windows 10, a Throwback with Upgrades in Software and Security

Qualcomm Enables Wireless Charging for Mobile Devices with Metal Cases

UK: Earth Will Only Have 12-Hour Warning for Massive Sun CME

Like Paper, Graphene Twists and Folds into Nanoscale Machines

Applications and Characteristics
of Copper-Oxide Rectifiers

Applications and Characteristics of Copper-Oxide Rectifiers, July 1933 Radio-Craft - RF CafeWhile reading through this article on copper-oxide rectifiers, I am once again reminded of how much we take for granted the conveniences of electrical test equipment on today's shop benches. The advent of FET-input multimeters was a huge step forward because the meter input impedance is so high that it has practically no impact on the circuit being measured. Prior to that, most simple meters drew their power from the circuit under test, thereby altering the true value of current or voltage being measured. Of course there were vacuum tube voltmeters (VTVM) with high input impedances, but few hobbyists or laymen could afford them. This piece reports on how the advent of a non-tube-based rectifier permitted AC measurements to be made by DC-driven d'Arsonval meter movements so as to not excessively

Notable Quote: Henri Poincaré

Henri Poincaré, mathematician, in "Science and Hypothesis" - RF Cafe"Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." - Henri Poincaré, mathematician, in Science and Hypothesis

Not Quite Getting It...

A mathematics professor explained to students through various lectures and examples:

Not Quite Getting It (math limit problem) - RF Cafe

It became obvious not everyone understood after one student submitted the following on a pop quiz:

Not Quite Getting It (math limit answer) - RF Cafe

 - originator unknown. 

Radio Service Data Sheets for
RCA Victor and Philco Radios

Philco Model 15 Series, 11-Tube Superheterodyne Chassis Radio Service Data Sheet, August 1932 Radio-Craft - RF CafeAt least for now, I am going to only scan and post Radio Service Data Sheets in graphical format, and run OCR on them to separate the textual content and make it searchable. These featuring Philco Model 15 Series, 11-Tube Superheterodyne ( photo) - RF Cafethe RCA Victor Model R-78 B1-Acoustic 12-Tube Superheterodyne floor console radio and the Philco Model 15 Series, 11-Tube Superheterodyne Chassis, are among what has been added already, with lots more to come. There are still many people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. I will keep a running list of all data

Author: Kirt Blattenberger on Google+ Author:
Kirt Blattenberger

Electronics Magazines
& Editors Crossword Puzzle

Engineering Magazines & Editors Crossword Puzzle for August 2, 2015 - RF CafeThis week's crossword puzzle has the theme of electronics and engineering magazines and their editors. I have to plead guilty at not knowing who the editor-in-chief (EiC) of many of the publications were. After so often reading the names of the many authors and technical editors and contributing editors, etc., getting printed every month, keeping track is difficult. You should recognize all the magazine names since they are our industry's primary publications. Apologies to Microwaves & RF magazine (Nancy K. Friedrich, EiC), and to High Frequency Electronics (Scott Spencer, EiC), for not including them in the puzzle. The fact is, though, that the more words I insert at the outset, the more difficult it is ...

Electronics-Themed Comics from
Electronics World & Popular Electronics

Electronics-Themed Comics, October 1961 Electronics World & October 1956 Popular Electronics - RF CafeHere for your Friday afternoon wind-down are these electronics-themed comics from vintage issues of Electronics World and Popular Electronics magazines. The sign on the Telco Rectifier Components president's wall is especially good. These comics make good fodder for opening your technical presentations ...

Power Transistor Specifications

Power Transistor Specifications, January 1963 Electronics World - RF CafeThe basics of power transistor specification and selection have not changed much since they became widely commercially available in the 1960s. Although available package shapes, power handling, cutoff frequencies, and other parameter options have been greatly expanded, still the most important aspect is not just selecting a power transistor but properly mounting it to ensure that the rated heat dissipation capacity will be realized. This article touches on some of those considerations and how to effectively deal with them ...

Electronics Crosswords
1963 Electronics World Magazine

Electronic Crosswords, January 1963 Electronics World - RF CafeFellow cruciverbalists, here from a 1963 edition of Electronics World is an electronics-themed crossword puzzle for your end-of-the week enjoyment. You can click on the grid for a larger, printable, write-on-able paper version. If you are an avid worker of crosswords and don't already know it, I have created hundreds over the last decade+ that are available here. Unlike this crossword from Electronics World (and most others for that matter), my puzzles have only hand-picked words related to engineering and science ...

Radio Telemechanics

Radio Telemechanics, September 1934 Radio-Craft - RF CafeOnce again, electronics and overall tech visionary Hugo Gernsback prognosticated in the 1930s what was then a pipe dream but what is today commonplace - remote control of multi-functioned apparati via secure wireless digital communications. Adolph Hitler had risen to power a year earlier and precursors of what would officially become World War II in 1937 had nations thinking about what kinds of technologies would be necessary should the little mustachioed dictator decide to invade his neighbors' countries in an attempt to rule over the Earth. That this was so is apparent in many magazine articles in the decade of the 1930s: The Saturday Evening Post, Life, Popular Mechanics ...

Featured Book: Essentials of RF and
Microwave Grounding

Essentials of RF and Microwave Grounding - RF Cafe"Essentials of RF and Microwave Grounding," by Eric Holzman. Grounding is a widespread and serious problem in microwave and RF engineering and, up until now, there hasn't been a practical, authoritative resource dedicated to the topic. This first-of-its-kind volume offers professionals a comprehensive understanding of the proper grounding techniques to use when working on varied microwave circuit and antenna design projects. Practitioners learn what problems can occur when grounding design is inadequate, and how to avoid them. The book covers a wide range of critical topics, from the fundamentals of low frequency ... [Please support RF Cafe through your purchases.]

R&S RTO and RTE Trigger, Decoder
for Manchester- and NRZ-Coded Buses

Analyze Broadband and Pulsed Signals up to 85 GHz with the New R&S FSW85 - RF CafeRohde & Schwarz has again expanded its range of trigger and decoder options for the R&S RTO and R&S RTE. With the R&S RTx-K50, the oscilloscopes help users debug serial protocols that employ Manchester or NRZ coding. The option can be used with a variety of standardized buses such as PROFIBUS, DALI or MVB as well as with proprietary serial protocols such as are typically found in industrial environments and in the aerospace & defense sector. Developers of products that use these types of interfaces can easily find implementation errors and so test and release their designs more quickly. The option, which covers data rates of up to 5 Gbit/s, supports ...

Saelig Intros 34.4 MHz-4.4 GHz
RF Signal Generator + Power Detector

Saelig Introduces Economical 34.4 MHz-4.4 GHz RF Signal Generator + RF Power Detector - RF CafeSaelig Company announces the SynthNV - a programmable 34.4 MHz to 4.4 GHz software-tunable RF signal and sweep generator with a built-in RF power detector. It is controlled and powered from any device running Windows, Linux or Android OS via a USB port. The included onboard RF power detector can be used as a generic RF power meter or combined with the SynthNV's sweep function to create a basic RF network analyzer. When the RF signal generator frequency is set, RF power can be measured in less than 400 uS. The SynthNV design also includes nonvolatile memory so it can be programmed to wake up with any frequency, power, sweep, and ...

Planar Monolithic Industries (PMI)
Intros 4 New RF Products

Planar Monolithic Industries (PMI) Intros 4 New RF Products, July 29, 2015 - RF CafePlanar Monolithics Industries (PMI) has introduced 4 new RF components that include an 18-40 GHz successive detection log video amplifier (SDLVA), a 6380 to 7440 GHz voltage variable attenuator (VVA), a 1.0-1.1 GHz single pole, two throw (SPDT) hermetically sealed reflective switch, and a 0-180° bi-phase modulator / phase shifter ...

Guerrilla RF Ramps Production
of Ultra-LNA Device

Guerrilla RF Ramps Production of Ultra-LNA Devices Featuring Industry Leading Noise Figure and Linearity - RF CafeGuerrilla RF, a leading provider of high performance MMICs, today announced it has received volume production orders for its premier ultra-low noise amplifier (Ultra-LNA) devices with industry-leading noise figure, gain and linearity. The GRF2051, along with the higher gain GRF2052, support a wide range of high performance LNA applications including macro base stations, small cells, distributed antenna systems (DAS) and other high performance applications requiring the absolute lowest possible NF along with the highest possible input-referenced linearity."Guerrilla RF is pleased ...

Fairview Debuts Complete Family of High
Rel RF & Microwave Power Amplifiers

Fairview Microwave Debuts a Complete Family of High Reliability RF & Microwave Power Amplifiers - RF CafeFairview Microwave Inc., a supplier of on-demand microwave and RF components, has released a complete portfolio of coaxial high reliability power amplifiers with broadband frequencies ranging from 0.5 MHz to 20 GHz that can operate over extreme temperatures across -55°C to +85°C. These high-rel amplifiers are commonly used in demanding environments for applications involved with electronic warfare, instrumentation, military communications, radar, point-to-point radio, telecom, test & measurement, medical, and SATCOM industries. The new families of hi-rel power amplifiers from Fairview are designed to overcome the electrical and ...

Keysight Technologies Supports PAM-4
M8000 Series BER Test Solutions

Keysight Technologies Introduces PAM-4 Support on M8000 Series BER Test Solutions - RF CafeKeysight Technologies today expanded its PAM-4 measurement solutions with support for PAM-4 data formats and built-in error counters on the M8000 Series BER test solutions. PAM-4 support and the ability to integrate a device’s built-in error counter helps R&D and test engineers characterize and test high-speed digital receivers for the data-center networking, storage and computer industries. R&D and validation teams characterizing next-generation digital designs face several test challenges. With data rates continuously increasing, emerging data center standards like OIF CEI and IEEE 802.3 Ethernet are moving to PAM-4 multilevel signaling formats. In addition, many ASIC