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Copyright 1999-2015

- RF Cafe Homepage -
"Stupidity can't be regulated, no matter how good the rules are." - Riley Hollingsworth

Today in History

Tech Headline News

- Archives -

Boeing Patents a Real-Life Force Field

Radio Shackto Sell Customers’ Personal Information in Bankruptcy Sale

Stealing Data from Computers Using Heat

Crashing Drones Exposing Secrets About U.S. War Operations

Samsung's Galaxy S7 Could Fold in Half

Motorola Found Guilty of Infringing on Patent from Infamous Troll

Samsung Rumored to Be Eyeing AMD Acquisition

Army Considers Electro-Optical Camouflage Fabric

Engineering Correct-by-Design PCBs

China Aims for Industry 4.0 by 2025

5 Gitmo Terrorists Traded for Known Deserter (what difference, at this point, does it make?)

Germanwings Pilot Locked out of Cockpit Before Crash (impenetrable cockpit a 9/11-inspired regulation, thanks to RadIslam)

Ford's New Car Will Force You to Obey Speed Limi

Why Wall Streeters’ Defections to Silicon Valley Are Good News for the Economy

Nanolaser Built Using Single Atomic Sheet

Quantum Experiment Verifies Einstein's 'Spooky Action at a Distance'

Private Banner Advertising
on RF Cafe
(for those who dislike 3rd-party)

Banner Advertising on RF Cafe in 2015Since stopping all private advertising at the end of 2014, I have been contacted by many companies wanting to be represented on RF Cafe, but do not wish to use 3rd-party advertising. Many are not comfortable with the perceived complexity and/or potentially high cost of that venue. My primary motivation for stopping private advertising was a combination of the time taken to manage all the advertising clients (up to 80) and the hassle of chasing down payments. I much prefer spending my effort adding valuable content to the website. Doing so redounds positively both to RF Cafe and to its advertisers. In order to be accommodating, if you are interested in presenting your products and/or services to RF Cafe visitors in a very positive manner, please take a look

Radio-Craft's List of Trade
Names and Model Numbers

January 1933 Radio Craft Cover - RF CafeMany people have provided resources on the Internet that made my life easier, and I have been amazed at being able to find photos and descriptions of very esoteric subjects for which I figured there was no chance of finding anything. In appreciation, there are times I post stuff that probably almost nobody will ever need, but maybe there is one guy (or gal) out there who will breathe a sigh of relief when finally finding the needed data. This list of radio trade names and model numbers appeared in a 1933 edition of Radio-Craft magazine. Page scans are provided at the top, and since search engines do not yet OCR images to be able to index their textual content, I have also included my OCR results at the bottom

Cartoon Advertising for
Radio Service Men

Cartoon Advertising for Radio Service Men, February 1933 Radio-Craft - RF CafeThe Star Radio Company, in Washington, D.C., was lauded in its day for pioneering the use of humor in its print advertising. I searched for more info on the company, but all I could find was a Library of Congress photo of a display of automatic washers and ironers - considered as high tech in the day as any vacuum tube radio. My grandmother had one of those wringer washing machines back in the 1960s. The wringer mechanisms were real safety hazards, hence the old quip about there not having been so much excitement around the house since granny got her

Author: Kirt Blattenberger on Google+ Author:
Kirt Blattenberger

United Screw and Bolt Corp.
Clutch Head Screw Ad

United Screw and Bolt Corporation Advertisement, January 1946 Radio News - RF CafeClutch head screws were one of the original 'security' or 'tamper-proof' type fasteners. United Screw and Bolt Corporation undoubtedly hoped their patented design would become the new standard in screw heads and drivers. Clutch head screws are still available today, but many do not include the round shape in the middle of the 'bowtie' shape. Fortunately for Mr. Henry Phillips, his eponymous screw head design, first introduced a decade earlier than when this advertisement appeared in Radio News, won out in the battle to replace the straight slot screw type. Any kind of screw head that captures the driver to prevent it from slipping off the head

Inductors & Inductance
Formulas Page Updated

Inductors & Inductancee Calculations Formulas Equations - RF CafePart of my reason for suspending private advertising on RF Cafe was to free up time to update a lot of the website content. All of the existing data is still valid of course, but I have been wanting to add to it for a long time. Since I also am fiddling around with writing an app for cellphones, this effort will serve a dual purpose in providing fresh fodder for the app as well. Please take a look at the newly updated Inductor & Inductance Formulas page.

Using Simulation Tools to
Debug an Oscillating Amplifier

Using Simulation Tools to Debug an Oscillating Amplifier (by Ed TRoy) - RF CafeEd Troy, owner of Aerospace Consulting, LLC, was kind enough to offer a few of his articles for posting on RF Cafe. This fourth paper discusses the benefits of modeling and simulating an amplifier circuit as part of an effort to troubleshoot an oscillating amplifier design. It comes to us in a timely manner after my recent Notable Tech Quote highlighting the often uttered "Amplifiers are oscillators that don't and oscillators are amplifiers that do" aphorism. The amazing accuracy of modern high-end simulators makes such exercises useful for many types of troubleshooting efforts

Radio Service Data Sheets

Zenith Models 430 and 440 12-Tube Superheterodyne Radio Service Data Sheet, February 1933 Radio-Craft - RF CafeIn a continuing effort to provide archival material for researchers and for anyone seeking information on a particular radio restoration project, these Radio Service Data Sheets for the Crosley "Chief" Model 132-1 and Zenith Model 430/440 radios from a 1933 edition of Radio-Craft are being posted. An Internet search will show that there are many people engaging in such activities. Restoring my Crosley Model 03BC console radio would have been more difficult if not for others who have done similar work to assist the 'community.' I generally despise the phrase "giving back" because it is usually uttered by people that really owe nothing to anyone, but somehow feel

Guerrilla RF Awarded Patent for
High Isolation Amp Architecture

Guerrilla RF Awarded Technology Patent for High Isolation Amplifier Circuit Architecture - RF CafeGuerrilla RF, a leading provider of high performance MMICs, today announces that the USPTO has issued Patent No. 8,970,296. The company's first issued patent, expiring in 2033, prevents amplifiers from turning on in the presence of large RF input signals – leading to exceptional isolation and minimal impact to their on-state performance. Guerrilla Armor™ also fits in the same form factor as the company’s existing, best-in-class noise figure LNAs, requiring no additional components and resulting in substantial cost and size savings. “Guerrilla Armor™ solves a unique issue found in high speed wireless data

Do You Use LinkedIn?

Official RF Cafe Website Poll

XMA Corporation Announces
CRYOGENIC Product Line

XMA Corporation Announces Cryogenic Product Development - RF CafeXMA Corporation, an industry leader in microwave and RF component technology, announced further developments of their CRYOGENIC product family of attenuators, adapters, and terminations, expanding performance parameters into the 4 Kelvin (-273.15°C) temperature range. Technical advancements with thin film design and fabrication at XMA, allows performance levels to reach new milestones with Millimeter and Microwave RF products. XMA Corporation, powered by Omni Spectra®, now offers a complete line of CRYOGENIC RF, coaxial passive components that range from

Guerrilla Marketing for Job Hunters 3.0 - RF CafeGuerrilla Marketing for Job Hunters 3.0: How to Stand Out from the Crowd and Tap Into the Hidden Job Market using Social Media and 999 other Tactics, by Jay Conrad Levinson. That's a long title. "New chapters integrate using social media and social networking tools like Facebook, Twitter, LinkedIn, and ZoomInfo in your job search, along with case studies from successful guerrilla job hunters that detail what works in today's hyper competitive job market with commentary from America's top recruiters." According to the current unofficial RF Cafe Poll (on the homepage), 1/3 of visitors are at least considering looking for a new job. This book gets the highest rating from readers for usefulness - even higher than the well-known What Color Is Your Parachute? 2015.

RF Power Output Measurements

R.F. Power Output Measurements, October 1963 Electronics World - RF CafeHere is a nice article on various types of power measurement instruments and their uses. The calorie wattmeter, calorimeter wattmeter, photometric wattmeter, thermo-ammeter, RF voltmeter, reflectometer, in-line meters, and slotted line are covered. Suggestions for selecting the proper instrument for measurement and operation is touched upon. Although the article was written in 1963, many of these instruments - or close descendants of them - are still in use today. 

Anatech Electronics Newsletter
for January 2015

Anatech Electronics Newsletter for March 2015 - RF CafeAnatech Electronics, a manufacturer of RF and microwave filters, has published its March 2015 newsletter. As always, it includes both company news and some tidbits about relevant industry happenings. This month, Sam Benzacar discusses the increasingly important issue of passive intermodulation (PIM) distortion products that originate in metal-to-metal contacts where dissimilar compositions are involved. New modulation schemes place PIM requirements into the -165 dBc realm, which is a difficult goal. Connector interfaces to cables and components are major sources of PIM interference. Being a major manufacturer of connectorized filters

MiniRF Low Cost Splitters
Support Broadband CATV

MiniRF Low Cost Splitters Support Broadband CATV - RF CafeRFMW announces design and sales support for MiniRF's low cost, 2-way splitter, model MRFSP0014. Covering the CATV bandwidth of 5 to 1002 MHz, the MRFSP0014 is designed for applications that require small, low cost and highly reliable surface mount components. Typical insertion loss is 0.5 dB with isolation of 30 dB. Amplitude balance measures 0.2 dB with phase balance of 1 degree. The MRFSP0014 can handle a maximum input power of 33dBm and comes in a 0.15 x 0.15 x 0.115", surface mount

Beyond the Kite & Key

Beyond the Kite and Key (Ohio U.) - RF CafeJordan O., of Ohio U.'s Russ College of Engineering and Technology, contacted me about their newest infographic titled Beyond the Kite & Key - Amazing Electrical Experiments That Furthered Engineering Innovations. Says Jordan, "While we may not know what the next revolutionary engineering achievement is, the future of engineering truly depends on accomplishments laid out in it’s past. Without Franklin and his kite or Bell and the wire, our modern knowledge of electrical engineering would cease to exist." "The graphic incorporates landmark experiments that sparked electrical engineering progress. It represents a timeline of "

FM Radio in Canada

FM Radio in Canada, January 1946 Radio News - RF CafeDepending on which news story you believe, both AM and FM (and TV for that matter) over-the-air broadcasting is dying out at an increasingly rapid rate. Between recordable podcasts, wired Internet connections, and the growing ubiquity of Wi-Fi connectivity, a large majority of people in the civilized world are getting their broadcasts via the Web. If you 'follow the money' in broadcast advertising, the lion's share of dollars have shifted to online venues, simultaneously draining revenue from local stations. When this story was written in 1946, OTA radio was king for real-time and free reception of information - particularly in a mobile environment. A dilemma arose in the form of RF spectrum allocation in border regions

NI AWR Design Environment
Showcased at EDI Con 2015

NI AWR Design Environment Software Showcased at EDI Con 2015 - RF CafeNI (formerly AWR Corp) will be showcasing NI AWR Design Environment™ software in its Booth #315 at the Electronic Design Innovation Conference 2015 being held April 14-16 in Beijing, China. Additionally, NI AWR Design Environment software will be showcased in four 20-minute talks as well as one 40-minute workshop during the week. These NI AWR software presentations and demonstrations include: NI AWR Design Environment V11 – What’s New, Microwave Office for MMIC, RF PCB and Module Design

Enterprise-E Control Line Stunt
Model Maiden Flight

Enterprise-E Control Line Stunt<br>Model Maiden FlightIn case you care - my Enterprise-E finally had its maiden flight today, and all went very well. The electric power system seems very appropriately fitted and provides way more than enough thrust. There is a lot of control surface throw available so the first flight was a bit shaky for the first few times around the circle, but the craft settled down after I got accustomed to it. Three flights were put in and I brought her home unscathed - that's success in anyone's book! A short video is posted on the web page

Notable Tech Quote

Riley Hollingsworth, K4ZDH, former FCC Special Council for Enforcement - RF Cafe"Don't engage [these] people, and don't humor the idiots. Stupidity can't be regulated, no matter how good the rules are. Just turn the big knob. Every rig has one." - Riley Hollingsworth, K4ZDH, former FCC Special Council for Enforcement, speaking about changes in FCC violation enforcement policy changes. Printed in February 2015 QST magazine. Watch entire speech at FARC meeting on video.

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website