Dilbert Electronic Candy
it does not dispense electronic candy. A few years ago my daughter gave me a second-hand Dilbert candy dispenser,
but the mechanism didn't work. It turns out the battery holder was wired backward from the factory so it could
never have worked. Anyway, there is one part that is especially frustrating to remove (the
computer front panel), and many people
have written to me asking for details. Have just now received another request, I decided to add that info to the
RF Cafe Visitor Finds His Great
Grandfather in 1944 QST Article
of the reasons I go to the trouble of posting the old magazine articles from SQT, Popular Electronics, Electronics
World, etc., is to allow people searching for stories about relatives a better chance of finding information.
A couple days ago the great grandson of a WWII reconnaissance officer who died in the line of duty. Captain William
H. Graham was a Ham radio operator before the war, holding call sign W9BNC. The story was told in the July 1944
edition of QST under the title of "Hams in Combat
- One Life to Give." Read the note sent by his grandson.
Government Is Bombarding
Citizens with Radiation!
Please, even if you sincerely believe that the
government is bombarding you with radiation
in order to control, maim, or kill you, do not call me. As a former agent of the U.S. government's
Unit for ciTizen
Subduance (code word: NUTS), all of my communications
are constantly under surveillance, so merely contacting me by telephone, e-mail, Skype, telegraph, message in
a bottle, or smoke signals virtually guarantees that "they" will find you and increase the attack already underway
against you. For all that is Holy, spare yourself from the personal torment and hide while you still can! Seriously,
four or five people call me every year wanting to tap into my expertise on RF energy to help them validate their
suspicion - no, wait, absolute certainty - of currently being the victims of a huge government conspiracy whereby
special frequencies that have been determined to allow mind control are attempting to turn them into mindless
subjects. I just got off the phone with another such individual. All sound genuinely friendly and inquisitive
regarding some kind of RF principle they are not totally knowledgeable about, and admit to being new to the world
of radio frequencies. Usually...
RF Engineering Theme
Crossword for 12/30/2012
the sake of avid cruciverbalists, each week I create a new
crossword puzzle that has a theme related
to engineering, mathematics, chemistry, physics, and other technical words. You will never be asked the name of
a movie star unless he/she was involved in a technical endeavor (e.g., Hedy Lamar).
This is the December 30, 2012 puzzle.
Loose Parts Comic
recommended some tech-themed "Loose
Parts" comics in the past (here
This one will give you a chuckle, particularly if you are a CW guy (or gal).
have an app on my phone that lets me talk to all the people around me. It shuts the phone off." - Mark Simone,
talk show guy
Tales from the Cube:
A Dark Story
intriguing story of troubleshooting prowess - and luck - will appeal to people like me who were around in the
electronics industry in the 1970s and 1980s when
CMOS logic was just coming onto the scene. Everyone loved the low power aspect of CMOS and rushed head-long
into implementation, then had to put a lot of time into modifying circuits to rectify issues. A new set of design
rules were required. I won't spoil the solution, but will say after you read this installment of
from the Cube, you will likely recall from decades ago at least one similar "ah-ha" moment in the lab.
Featured Book: RF and
Microwave Radiation Safety
and Microwave Radiation Safety, by Ronald Kitchen. A practical handbook for all involved in electronic design
and safety assessment, RF and Microwave Radiation Safety covers the problems of RF safety management, including
the use of measuring instruments and methods, radiation hazards and risks resulting from electromagnetic interference,
as well as reviewing current safety standards and the implications for RF design. The second edition takes into
account a wide range of technical and legislative changes, and has been revised in line with the latest EU and
international standards. Issues raised by increasing levels of microwave pollution from mobile phones and other
sources are also confronted.
of Simple Math
that many people were reluctant to approach the theoretical aspect of electronics as it applied to circuit design
and analysis, QST (the American Radio Relay League's monthly publication) included equations and explanations
in many of their project building articles. Occasionally, an article would be published that dealt specifically
with how to use simple mathematics. In this case, the June 1944 edition, we have the second installation of at
least a four-part tutorial that covers resistance and reactance, amplifier biasing (tubes since the Shockley-Bardeen-Brattain
trio hadn't invented the transistor yet) oscillators, feedback circuits, etc.
IEEE: Engineering in
Biology and Medicine
inventions in medicine and biology often require the assistance of electrical engineers to provide an interface
for measurement and/or control. Ingestible and implantable wireless probes and monitors, wearable brain wave caps,
robotic limb replacement and assistance devices, imaging equipment, and nanotechnology are a few of the applications
requiring an EE partnership. Many doctors were first
engineers before getting a medical degree, and as such do their own circuit and/or mechanical and/or software
IEEE is executing (maybe the wrong verb to use when addressing medical topics)
an awareness effort to hopefully attract engineers into the field. Some projects have you working directly with
patients and volunteer test subjects, so if you are one of those fabled non-introverted engineers, this might
be the career course for you.
2013 IEEE RFIC Symposium
Call for Papers
are underway already for the 2013 IEEE RFIC
Symposium in Seattle, Washington, on June 2-4.. As such, a Call for Papers has gone out
Please visit Noisewave in
Appreciation of Their Support
makes standard and custom noise test solutions to meet commercial
and military wireless applications. Noise diodes in TO-8, DIP, or SM pin packages. Calibrated broadband sources
ideal for NF measurement & BIT.
Improving the Receiver Using
a Screen-Grid Coupling Stage
December of 1931, the discovery of deuterium (aka 'heavy water) was announced by Harold Urey, Japan abandoned
the gold standard, the New York Metropolitan Opera broadcasted an entire opera over radio for the first time (on
Christmas day), and the ARRL's QST magazine published an article about how to improve a receiver by using a screen-grid
coupling stage on vacuum tubes. A 'tickler
coil' is introduced via a tuned circuit to provide a small amount of positive feedback to the grid in order
to make the amplifier stage more sensitive in the band of interest. Care needed to be taken to avoid so much feedback
that oscillations could occur. As with most of these old articles...
Many Thanks to JFW
Electronics for Backing RF Cafe
is a major manufacturer of attenuators, RF switches, specialized
test systems for use in the cellular, telecom, OEM test equipment, medical, automotive, defense, and automated
test systems markets. JFW offers custom designs at catalog prices, fast delivery and no NREs!
Please Visit Linx Technologies
in Appreciation of Support
Technologies' RF modules,
remote controls, evaluation
kits and master development systems feature straightforward hardware configuration and clear documentation, making
it simple for engineers and hobbyists to integrate wireless features without the hassle and expense of engineering
RF functionality from scratch.
is an advertisement for
Company microphones that I scanned from page 101 of my copy of the February 1943 QST magazine. As
with many companies during the World War II era, this one's theme is the service their products are providing
to America's servicemen. Per the ad, "If you were receiving radio messages from men in the midst of earsplitting
battle noises, you'd hear crisp speech undistorted by background sound effects. Electro-Voice Microphones, in
military service, are helping to make it possible. Similar microphones, designed to achieve such results, will
be available for specific commercial applications ... after our wartime job is done..."
Thanks to Apex Wireless for
Their Continuing Support
1985, Apex Wireless has offered consulting, engineering, and design services focusing on high-performance, cost-optimized
products that employ wireless RF transmitters, receivers, and transceivers. To complement our
RF design expertise, they work with local experts in DSP,
ultra low power design, packaging, certification, and manufacturing.
How to Draw a Circle
with a Square
the circle" may as yet be an unattainable goal for even the best mathematicians, but the November 2012 edition
of The Family Handyman magazine had a tip for how to use a square (of the framing type)
and two nails to draw a circle. This is what it said: "Make
a Circle with a Square - Here's a tip for laying out small circles or parts of circles. Tack two nails to
set the diameter you want, then rotate a framing square against the nails while you hold a pencil in the corner
of the square. You might need to rub a little wax or some other lubricant on the bottom of the square so it slides
easily. Don't ask us why this process works; all we know is that it does." They're either very honest or they
don't think the average reader would understand the explanation. The Pythagorean theorem is the key, of course,
for explaining the reason. For any right triangle: a2 + b2
= c2, where 'a' and 'b' are the lengths of the two perpendicular
sides, and 'c' is the length of the hypotenuse...
Tales from the Cube: Out-of-
Spec Problem with a Long Tail
like the artwork that usually accompanies these 'Tales from the Cube' stories of troubleshooting prowess on the
part of fellow engineers. This installment, "Out-of-Spec
Problem with a Long Tail," reaches way back to the dawn of computer-based circuit analysis to tell how a particularly
troublesome problem was solved by running a Monte Carlo routine
to discover the culprit. Here is an explanation of a 'long-tail-pair
differential amplifier' in case you've never heard of it.
Many Thanks to Oscilent
for Continued Support
is a manufacturer of frequency control products offering design and production expertise in SAW Filters, quartz
crystals, crystal oscillators & Filters, and ceramic resonators. Their product line includes extensive custom
and standard capabilities in TCXOs and VCXOs, in addition to full design and development capabilities in each
focus product category. Oscilent serves OEM, design, and CM customers in all major world development and manufacturing
Science & Engineering Theme
Crossword for 12/23/2012
the sake of avid cruciverbalists, each week I create a new
crossword puzzle that has a theme
related to engineering, mathematics, chemistry, physics, and other technical words. You will never be asked the
name of a movie star unless he/she was involved in a technical endeavor (e.g.,