Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives Magazine Sponsor RF Cafe Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Alliance Test Equipment Centric RF Empower RF ISOTEC Reactel RF Connector Technology San Francisco Circuits Anritsu Amplifier Solutions Anatech Electronics Axiom Test Equipment Conduct RF Copper Mountain Technologies Exodus Advanced Communications Innovative Power Products KR Filters LadyBug Technologies Rigol TotalTemp Technologies Werbel Microwave Windfreak Technologies Wireless Telecom Group Withwave RF Cafe Software Resources Vintage Magazines RF Cafe Software WhoIs entry for RF Cafe.com Thank you for visiting RF Cafe!
Innovative Power Products Passive RF Products - RF Cafe

Cafe Press

RF Cascade Workbook 2018 by RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

DC-70 GHz RF Cables - RF Cafe

Tech Smorgasbord Archives - 22

RF Cafe University"Factoids," "Kirt's Cogitations," and "Tech Topics Smorgasbord" are all manifestations of my ranting on various subjects relevant (usually) to the overall RF Cafe theme. All may be accessed on these pages:

 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37

Bluejacking 101

(source: bluejackQ)

RF Cafe Smorgasbord - BluejackingAdd another term to your wireless lexicon: Bluejacking. If you own a BT-enabled wireless device and have not yet been Bluejacked, your time is coming. Bluejacking is mostly a harmless way to prank someone, but it can be intimidating. Popular "victim" spots are on trains and in coffee shops. One trick is to Bluetext someone a "free latte offer" and watch when he tries to collect at the counter. Sending, "I like your pink top," to someone who knows you must be within 10 meters of her is probably not a good idea. Not that I am encouraging it, but there are lots of stories to read for ideas on Bluejacking, Bluechatting, Bluedating, and other things Blue.


Caveat Emptor: Résumé Fraud on the Rise

(source: IEEE)

According to recent news reports, incidences of résumé fraud are on the rise. Most directly assert, or at least imply that it is due to the global economic slow-down, but the fact is it goes on even in the best of times. Recall the 2006 case of former RadioShack CEO David Edmondson, who made up two degrees he never earned. Studies indicate that more than 20% of résumés have claims of academic degrees never earned, and 60% exaggerate their professional accomplishments (title, salary, etc.). Extensive background checks can cost many thousands of dollars. Experts suggest the best defense is to pick up the phone and verify any claims important to you as an employer.


Does Your Company Do Facebook?

(source: Facebook)

RF Cafe Smorgasbord: AWR Facebook PageGiven the popularity of the social networking websites, it seems only natural that companies have created presences in hopes of exploiting the concept. Younger engineers are almost certainly Facebook savvy. AWR recently had a press release announcing their official Facebook page. It contains, among other things, press releases. Comdel and Analog Devices also each have an official page. Other companies like RFMD have Facebook pages set up by employees, but are not sanctioned by the company.


Science & Engineering Body Art

(source: RF Cafe)

RF Cafe Smorgasbord - Photon Wave TattooTattoos have taken a decided turn toward the cerebral. A growing trend of science and engineering themed tattoos are appearing on the trendy streets and college campi. Professor Stevens Johnson sent me this photo of his newly minted photon wave tattoo. He also sports a custom "Planck Scales" design, with "Gauss' Theorem and Stokes' Theorem in a tribal motif" being nearly ready for prime time. Women in science have adopted the practice as well, thus helping to quash the tramp stamp nomenclature.


10 Most Difficult Jobs to Fill

(source: Manpower)

Now might be a good time to ask for a raise or seek out a new job - in spite of the recession. As always, skilled people are highly sought after. Per Manpower's research, "While talk has slowed in the U.S. about the pending talent shortage, it is becoming more clear that there is a talent disconnect."
1 Engineer
2 Nurse
3 Skilled Trades
4 Teacher
5 Sales Representative
6 Technician
7 Driver
8 IT Staff
9 Laborer
10 Machinist / Operator
What is the easiest job to fill? Probably Politician.6-18-2009

How My Heisenberg Light Came On

(source: Wikipedia)

RF Cafe: Heisenberg Uncertainty Principle EquationMost of us have heard of the Heisenberg Uncertainty Principle, which states that both momentum and position of a mass cannot be precisely determined simultaneously. I never quite conceptualized the idea until recently when reading an article where it was alluded to without explicit mention. Basically, in order to measure momentum (ρ=mv), you need movement from location A to location B - two different locations to establish velocity - hence the inexact determination of position when precisely measuring momentum. Vice versa for precisely measuring position. 


Free Advertising Advice

(source: an RF Cafe original)

RF Cafe Smorgasbord - How It's MadeBeing engineers, technicians, and hobbyists, RF Cafe visitors' interests tend toward hands-on themes. We like to learn how to do things ourselves, and few venues facilitate learning better than a video. That is one reason the TV show How It's Made is so popular with techies. I cannot find any RF product or service companies that have videos demonstrating how they do their "thing." How about shooting a 5-minute video of how to manufacture a cavity filter, tweak an amplifier for optimal gain & noise figure, or measure the radiation pattern of an antenna in an anechoic chamber? It might be the next viral hit with YouTube nerds, and invaluable free advertising for you!.


Headlight Communications

(source: technology Review)

RF Cafe - Headlight CommunicationsIntel R&D guys are working on a system allowing vehicles to talk to each other via headlights and taillights. Traffic lights will be in on the conversation as well. As envisioned, a processor will interface with distributed sensors and transceivers to alert drivers of impending hazardous situations, even taking automatic evasive action if necessary. Warnings will be provided with displays and audible signals - including through wireless multimedia devices. Reader comments include, "I'd rather have a system that let me send a message to the bozo ahead that his turn signal has been flashing for the last 5 miles."


IC Manufacturer Top 20 Ranking

(source: IC Insights)

According to an IC Insights report, 2009 saw a major reordering of rankings in the IC world. Only 3 of the top 20 kept their 2008 positions. They blame the recession.
'09 '08 Company
1 1 Intel
2 2 Samsung
3 5 Toshiba
4 3 TI
5 6 STMicro
6 8 Qualcomm
7 9 Sony
8 7 Renesas
9 12 AMD
10 4 TSMC
12 11 Infineon
15 18 Broadcom
18 16 Freescale

Lightning + Wind Turbines

(source: Machine Design)

RF Cafe Smorgasbord - Lightning strike mitigation for wind turbinesIntegrating wind turbines into the established electrical grid is a tough job. Voltage and current synchronization for such an inconsistent motivation force (wind) requires complex equipment. Severe weather is a great concern as well - particularly lightning strikes. Those 100+ meter tall towers with blades extending another 100+ meters into the sky are perfect opportunity for a discharge. Mitigation schemes like embedding lightning rods in the blades and installing robust overcurrent and overvoltage protection do a good job, but it all comes at great cost. Billionaire T. Boon Pickens recently abandoned his $2B investment in wind power because of unforeseen cost issues.


Top 2009 Recipients of Government $$$

(source: USASpending.gov)

RF Cafe Smorgasbord - USA Federal Spending 2009Assuming you are part of the mere 50% of citizens that actually pay income taxes, do you want to know where your tax money is being spent? These are number straight from the Fed website.

Top 10 Defense Contractors
Lockheed Martin $20.4B
Boeing $14.7B
Northrop Grumman $8.7B
General Dynamics $7.8B
Raytheon $6.0B
United Technology $4.7B
Bechtel $3.5B
Savannah River * $3.3B
L-3 Comm $3.3B
McKesson Corp** $2.7B
* Challenge: Try to find Savannah River Remediation's website (an eco company)!

** Health care & pharmaceuticals7-2-2009

IMS 2009: RF Cafe Will Be There

(source: IMS 2009)

RF Cafe - Kirt & Melanie as seen at IMS 2009On Tuesday, June 9, both Melanie and I will be attending the IMS show in Boston. We will be there as spectators, and will be roaming the exhibit hall most of the day. Our plan is to visit as many of our advertisers (the folks who help deliver RF Cafe to you), and as many of our website patrons (like you) as possible. Please stop us to say hello. If you hand me a card or paper with your name and contact info, I will put you in for an RF Cafe prize drawing. Click on the image above for how to identify us while there.

DC-70 GHz RF Cables - RF Cafe
Rigol DHO1000 Oscilloscope - RF Cafe