Music Power Rating
- Help or Hindrance?
of us, long before being introduced to the concept of power in electrical circuits, learn
about it in terms of mechanical power and/or sound power. It takes some doing to abandon the
esoteric nature of power and be trained to grasp the scientific and mathematical aspects
of power in all its forms. When the driving source is steady state or a pure sinewave, life
is relatively simple, but such is more often than not an exception to the system being studied.
Here is a nice, short treatise on the concept of sound power that will augment your earlier-learned
music power rating.
AWR Announces Winners for
Taiwan U. Student Competition
Corporation announces the winners of its
2013 National Taiwan University Student Design Competition. AWR partnered with National
Taiwan University in mid-2013 to sponsor the first ever Taiwan Student Design Competition.
The objective of the competition was to encourage students
in Taiwan to become involved in the dynamic profession of microwave and RF engineering and
to apply their knowledge to practical designs using the highly efficient AWR design methodology...
Thanks to PCB Material World
for Longtime Support
Material World is an independent distributor and market maker of
PCB raw materials, located
in the Northwest suburbs of
We buy, list and sell PCB raw materials such as copper clad laminates, copper foil, drill
backer and entry, among other items. Our objective is to act as a buy-sell PCB materials
exchange; enabling efficiency in materials usage for PCB manufacturing. Our emphasis is on
high end and/or hard-to-find products such as microwave materials, colors, heavy coppers,
and obsolete and other non standard products.
your workplace is anything like the ones I have experienced, most print issues of magazines
end up in the mail room recycle bin or trash can - they never make it out the door. You might
even scan the TOC and dog-ear a couple pages for later reading, but seldom get around to it
before ultimately chucking them in the can. Fortunately, you can read the articles online
if you know they exist. I post a list like this one about once a week to help you keep track.
Microstrip Antenna Maintains
Hall Effect Sensors Measure
Fields and Detect Position
Measurements in Spectrum
Sigma Delta ADCs : A Non-
White Paper: Close Proximity
Co-Located GPS Receivers
Technologies has published a white paper titled "Low
Noise Amplifier (LNA) Linearity Impacts to Close Proximity Co-Located
GPS L1 Receivers." A commercial low-cost GPS L1 (Fc = 1575.42 MHz)
receiver in close physical proximity to a 2G/3G/4G compliant cellular handset transceiver
FEM is analyzed for performance impacts related to various forms of electromagnetic interference.
A description of how the GPS L1 receiver works is presented. GPS L1 receiver link budgets,
simulation and measured receiver data, and spurious...
8 New Titles Added to
Book Drawing Selection
to the generosity of Artech House and Cambridge University Press, eight new books have been
added to the selection available to monthly
RF Cafe Book Drawing winners.
There are currently 21 titles to choose from if you are the lucky person. To date, I have
given away more than 90 books, and have paid the shipping cost on all of them. It is one way
to thank the many visitors and contributors to RF Cafe's ongoing success.
Carl & Jerry: TV Antennas
this episode of Carl & Jerry, the teens ponder a question posed by Jerry's mother upon
looking down their hillside home: "[L]ook at all those
TV antennas down there. Hardly two of them are alike; yet they're all intended to receive
the same stations. How come there are so many different kinds?" That was all the pair needed
to set them off in an investigation to determine the answer. Being avid electronics and RF
hobbyists and experimenters, they discuss the principles of how antennas work, various types
of transmission lines, impedance matching, antenna types, bandwidth, and other topics relevant
to the challenge. As with most Carl & Jerry stories, the intent is to educate...
in 2005, LadyBug Technologies manufactures the PowerSensor™ line of miniaturized
USB RF & microwave power sensors.
LadyBug manufactures high accuracy average, pulse, and pulse profiling sensors
GUI interfaces covering up to 26.5 GHz and 80 dB dynamic range. These sensors set
a, patented industry standard, No Zero / No Cal technology. There is no need to
disconnect or wait for internal zeroing and calibration prior to making accurate low power
F., of Suwanee, GA, is the February 2014,
RF Cafe book drawing winner. Dean
Integration of Passive RF Front-End Components in SoCs, by Hooman Darabi and
Ahmad Mirzaei. Each month I select one or two names from a list of people who have either
ordered one of my RF Cafe software
products, or sent me an e-mail asking t obe entered. The book was Graciously provided
by Cambridge University Press
story appeared on a news website I found while gathering daily tech headlines... in case you've
forgotten where your e-waste is likely to end up. According to German photographer Kevin McElvaney,
the 40,000 Agbogbloshie (near Accra) locals call their land
Sodom & Gomorrah, after the Biblical
city that was destroyed by fire. This is just one small part of the world where such activities
are daily routine for those living in abject poverty. BTW, similar
sacrifices are made to build our e-devices in the first place during the extraction of
raw materials and during manufacturing and transportation of finished goods. Many of our clothes,
vehicles, appliances, tools, sports items, food containers, and other items pass through...
is your chance to own a pile of vintage electronics
magazines for just the cost of shipping. As you are probably aware, for the past few years
I have been buying vintage editions of QST, Popular Electronics, Electronics
World, Radio & TV News, Radio-Electronics, and Wireless World,
for the purpose of scanning and posting articles that I believe will be of interest to RF Cafe
visitors. I have gotten all I need from them and rather than having them sit around taking
up space, I am offering to mail them to you on a first come, first served basis. Most of the
magazines were purchased on eBay...
1961, MECA* has served the microwave industry specific to passive components in the DC to
20 GHz frequency range. MECA serves all areas of the RF/Microwave industries including
world class network
and supporting supply chain infrastructure. We have long been the "backbone" of high performance
wired and air-interfaced networks such as in-building applications, satellite communications,
radar, radio communications, telemetry applications, mobile radio, aviation & air traffic
communications. *Microwave Electronic Components
is scary. Believe it or not, there is a group of scientists who think it might be a good idea
to beam very low frequency (VLF) radiation into the upper atmosphere
to erase the Van Allen radiation belts.
I kid you not. An article in the March 2014 edition of IEEE's Spectrum magazine describes
a plan to clear out the proton cloud residing in the inner belt (1,000
- 9,600 km altitude) and the electron cloud hovering in the outer belt
(13,500 - 58,000 km altitude). Both Van Allen radiation belts,
particularly the outer ring, are hazardous to electronics, i.e., satellites, because of the
circuit-frying potential due to a build-up of electric charges that can, under certain conditions,
penetrate an imperfect Faraday shield...
quiz from Popular Electronics challenges (not too much, though)
your knowledge of
energy conversion in common devices. A few of them might be unfamiliar to people born
after about 1990, but even so, you've probably seem them all at some point, especially if
you are a regular RF Cafe visitor (meaning you're probably smart).
Robert P. Balin constructed many of this type quiz for PE. In fact, clicking on the following
hyperlink will find the
Popular Electronics Quizzes for you.
will want to see this. Collecting thousands of QSL cards and photographs of their Ham radio
operators and radio equipment is a monumental accomplishment today, but it was even more of
a challenge in the early and middle part of the last century. You must actually make contact
with the station to legitimately collect a QSL card, and then the remote operator must be
willing to absorb the cost of mailing you a card. Mail service, particularly from some overseas
locations, was no guarantee of successful delivery. A large portion of radio installations
were cobbled together by their operators from scrap parts and had marginal functionality,
even into the 1960s and '70s, so contacts were more difficult. As early as 1924, Don Retzlaff's
grandfather, Thomas "Tom"
Russell Gentry (W5RG) began the process where over a span
of more than half a century he acquired more than 5,000 QSL cards from all over the Earth...
Schwarz now offers up to 10 kW of power in a frequency range from 9 kHz to 225 MHz
R&S BBL200 amplifier family.
to a new liquid cooling system, these models are quieter and more compact than ever before.
The R&S BBL200 will be on display at EMV 2014 in Düsseldorf at booth CCD-202.
Electronics designs and manufactures the industry's widest range of
RF and microwave filters at
up to 40 GHz, as well as power dividers, directional couplers, and many other product
types. We specialize in standard and custom designs for commercial wireless, public safety,
satcom, and defense applications, and we can meet stringent military environmental specifications.
to Download and Listen to All the Old Time Radio
Shows You Want" That is the tag line on the RUSC (R U Sitting Comfortably?)
website. Having been a longtime fan of the old radio shows, I gratefully accepted an offer
by co-owner Joy Norris to poke around the website that she and her husband Ned have created.
RUSC is a subscription-based collection of hundreds, nay thousands of programs from "The Golden
Age of Radio" that are available for your listening pleasure either streaming live or as a
download for listening to at a later time. A list of the main show categories appears on every
page for easy access. Not only are more familiar comedy titles like Abbot & Costello,
Milton Berle, and Father Knows Best included, but lesser known...
been a while since posting job hunting and career article links. These might be of interest
8 Lies Interviewers Tell Job
5 Steps to Enhance Your
Online Job Search
Low-Cost Strategy for a
Engineering Grads Enjoy
Greater Job Prospects
How to Survive Getting Fired
from a Tech Company
8 Reasons You Should Turn
Down That Job Offer
How to Know When You've
Outgrown Your Job
Jobs for No Pay?
Giant Resumes Fail to
Windfreak Tech designs, manufactures, tests and sells high value radio frequency products
such as RF signal generators, synthesizers,
power detectors, mixers, upconverters and
We develop high quality, reliable, low cost products to make your life easier. Windfreak Tech
is developing high quality, low cost products to make life easier for RF engineers and hobbyist.
Future products will be more synthesizers, transmitters, receivers and test equipment - All
at low cost.
couple decades ago, you would expect to pay $100 for a good quality handheld DMM that measured
AC and DC current and voltage and maybe even power, plus had a few other functions like frequency
counting, and capacitance and transistor beta measurement. Now for about the same money, you
can buy a handheld digital oscilloscope (DSO) for about the same money. This 1 MHz bandwidth
RioRand DSO features 1 Msps, 12-bit sampling and a 320x240 pixel color LCD display.
is included. The price from Amazon is less than $90 with free shipping. If you need more bandwidth,
Owon HDS1021M provides a 20 MHz BW and also has a multimeter function for a tad over
the extra BW and 2 channels? Less than $400 gets you the
Owon HDS1022M-N with 20 MHz BW, or $800 for the
Owon HDS3102M-N with 2 channels and 100 MHz. This is a good time to add one to your
Model No. DTA-14G40G-32-CD-2 is a
10 Bit programmable attenuator with step resolution as low as 0.04 dB which provides
over 32 dB of attenuation over the frequency range of 14.0 to 40.0 GHz. This
model is offered in a slim line housing measuring 2.0" x 1.8" x 0.5" with 2.92 mm female
connectors and operates on a single +15 VDC supply with only 40 mA of current consumption
I first saw this video, I thought it was a satire. The video is a for-real commercial promoting
the new Supersmoker Bluetooth
e-cigarette that has built-in Bluetooth connectivity and a music player. From their website,
"Supersmoker or Clubsmoker are electronic cigarettes, you can smoke without all the harmful
ingredients of a conventional cigarette. We have two kinds, rechargeable and disposable e-cigarettes.
With the rechargeable you need refills and this cigarette can be recharged every day. The
disposable is an e-cigarette that lasts about 2 packs of conventional...
Electronics Manufacturing Corp's new MHF/U.FL series data
sheet details the company's latest ultra miniature coaxial interconnect system that operates
from: DC-6 GHz. This connector interface was developed for applications in small form
factor wireless mobile electronic devices. In addition to information on applications, materials,
finishes and typical electrical performances, full detail is provided on how to specify a
MHF/U.FL cable assembly or "pigtail" assembly, including compatible coaxial cables...
over 20 years Z-Communications has employed the latest in proven technology to achieve low
phase noise, wide tuning ranges and higher operating frequencies in our
VCO and PLL modules. Our state-of-art,
speed SMT manufacturing facility is located in San Diego, CA. Our solutions can be tailored
to address any VCO or PLL need with the highest performance available in today's demanding
market. Z-Comm can also provide custom solutions for customers with short deadlines.
here we have pi squared, which an engineer would call 10." -
Frank King, cartoonist,
creator of Gasoline Alley (Source: Wikipedia). That statement
was made by Walt Wallet (the main character) to his tech-inclined
nephew Skeezix (cowboy slang for a motherless calf). Over the
years, Gasoline Alley included many episodes with Skeezix dabbling in electronics - usually
not very successfully.
week's crossword puzzle has a heavier concentration of physics-based words and clues, so I
titled it the Physics Crossword Puzzle. Highly imaginative, non? As always, all of the words
are technology terms, so you won't need a nimrod couch potato accomplice to complete it.
1994, leading wireless electronics companies have relied on 3Gmetalworx to deliver cutting
edge solutions for advanced
shielding requirements. From
and design services to JIT manufacturing supply, our clients depend on us to provide a seamless
service pathway supporting the entire product lifecycle. In order to become the industry leader
in our market segment, we have invested in the necessary infrastructure and process optimization
required to excel in this demanding field. Continual improvement is in our DNA.
I of this article appeared in last month's (September) edition.
It introduced concepts in
and siting. This second part talks about cost tradeoffs for various aspects of a DX setup.
Author Paul Rockwell does a nice job of providing graphs of cost versus performance increases
for transmitter power, antenna gain, tower height and constructions, etc. He uses prices typical
of the mid 1960s, but even without knowing the equivalent modern day equipment prices, the
shapes of the curves are good indicators of where the point of diminishing returns exists.
Paul Rockwell wrote a 4-part series on station design for long distance
(DX) communications that covered antenna selection...
Equipment Connection provides
test and measurement equipment
for sale, lease or rent. New and refurbished with warranty. We buy pre-owned test equipment
($2,000,000 budgeted each month) and offer asset
services to market your used surplus equipment world wide. Trade in programs are available.
We offer over 300 test equipment manufacturers including Agilent, Tektronix, Anritsu, Rohde &
Schwarz, Advantest and Fluke. We buy and sell bench top, general-purpose test and measurement
equipment. Contact us today.
Rockwell wrote a 4-part series on
for long distance (DX) communications that covered antenna selection and siting
(Part I), economics and construction(Part
II), station configuration and receiver topics (Part III),
and propagation quirks and operating tips (Part IV). This first
part goes into some of the gory detail of surrounding terrain considerations and necessary
antenna launch angles, complete with equations. Most of the work is based on multi-element
horizontal Yagi antennas. The term "forezone," of which a formal definition is not locatable
in a Google search (no reference to it at all), is used throughout
the series, and refers to the radiation area in the forward direction.