IPP Intros New100–520 MHz
90° SM Coupler
Power Products introduces their
Model IPP-7057, a
200 watt surface mount 90° Coupler that operates from 100–520 MHz. Detailed product specs,
including the outline drawing, typical test data, and s-parameters are available on IPP's
website. The IPP-7057 will combine two signals up to 200 watts CW of total output power. This
coupler is produced in an SMD package size of 0.750 x 2.00 inches. Insertion loss is less
than 0.60 dB, amplitude balance is less than ±0.80 dB, phase balance is less than ±7°.
TV Standards Paves Way
for Commercial Service
story from a 1941 edition of National Radio News reports on the FCC's having passed
regulations to allow the rollout of
commercial television service as of July 1, 1941. These standards, observes the Commission,
"represent, with but few exceptions, the undivided engineering opinion of the industry." They
"satisfy the requirement for advancing television to a high level of efficiency within presently
known developments." Furthermore, "Frequency modulation is required for the sound accompanying
the pictures. Thus, television is now benefited by the recent developments of frequency...
Please Thank PMI for Their
Monolithics has been setup to design, develop, manufacture, test, and market complex state-of-the-art
RF MIC and MMIC components, supercomponents, and subsystems for applications in telecommunications,
terrestrial, satellite, and mobile-radio communications, defense (ECM, ECCM, ESM, Radars,
EW), CATV, navigation and marine electronics, FAA/DOT-avionics, ground based systems, and
Please Welcome RIGOL
Technologies as an Advertiser
Technologies is an emerging T&M leader and a technology innovator in electronic measurement.
RIGOL's premium line of products including:
Signal Generators, and
The DSA800 Spectrum Analyzer
by RIGOL redefines the product category by setting new standards for performance and price.
Its digital IF technology guarantees reliability and performance will meet the most demanding
Forbes' 2014 Richest
just published their list of the world's richest
people for 2014, which includes 1,645 billionaires. Bill Gates bubbled to the top this
year, edging out Mexico's telecoms tycoon Carlos Slim Helú, who held the distinction the previous
four years. It is amazing how often you read where once a member of the über rich declares
to be on a mission to gift huge portions of wealth to charities, he/she seems to get even
wealthier. Scanning through the list of the wealthiest people and looking at the businesses
they are associated with makes apparent that big bucks can be made in just about any realm
as long as you are one of the top players. Owning a casino is a good bet for making...
Anatech Intros Cavity BPF
Filters & 4-Way Power Divider
Electronics has released new designs for a 862.5 MHz
cavity bandpass filter,
an 2422 MHz cavity bandpass filter for Wi-Fi
a 2.0-2.9 GHz 4-way power divider/combiner, and a 902-928 MHz cavity bandpass filter
for ISM band. All can be ordered directly through their
AMCrf web store.
Electronic Numbers Quiz
Balin created many quizzes for Popular Electronics magazine back in the 1960s and
1970s. This particular
Electronic Numbers Quiz presents various objects and your challenge is to match one of
the provided numerical values to each item. For example, a tuning fork is most commonly, in
the Western world, associated with a certain frequency for tuning musical instruments (electronic
and mechanical). As is often the case, being familiar with the "standards" of the era is helpful
on a few of the items like the tuning capacitor and the IF transformer, but you should be
able to eliminate some options by knowing the impedance of the twin lead...
Searching for the Q
Cahak, RF engineer and owner of Sunshine Design Engineering Services, just sent me another
paper he has authored on the subject of determining the
("Q") of rectangular and cylindrical cavities. Before you decide
to skip reading this article because the topic might seem too esoteric, Joe does much more
than present formulas and tables. He also includes a tale of the research needed to cull and
vet the many, often conflicting, opinions of which formulas are correct. Ultimately, a decision
was made to select formulas that most closely matched empirically determined values from published
data. If Mr. John T. Frye was still writing Carl & Jerry adventures...
Cobham Awarded Option for
AN/ALQ-99 Tactical Jamming
has been awarded a $21.8 million contract modification by the US Naval Air Systems Command,
exercising an option to procure additional Low Band Transmitters (LBT), a variety of antennas
and adapter interface modules for
AN/ALQ-99 Tactical Jamming System to be used by the US Navy and the Australian military. Under
Cobham Defense Electronics in Lansdale, PA will manufacture 8 LBTs for the US Navy and
11 for Australia; 11 vertically polarized antennas for the Navy and 6 for Australia; 17 high
band horizontally polarized antennas for the Navy...
Oscillators - How They Work
Radio Institute (NRI)
was founded in 1914 at the dawn of the radio age. It provided self-study courses as well as
classroom instruction on the art of electronics and radio communications. A bi-monthly magazine
titled National Radio News was published from 1929-1953. This article explaining
how oscillators work appeared in the December 1940 edition. Although circuits of the day used
vacuum tubes, the principle of voltage and phase relationships required to initiate and sustain
oscillations are the same as for transistor circuits. A step-by-step description is provided
from the time the power is applied until stable oscillations are established.
for RF Engineers
not a big fan of government employees in general since many, IMO, are filling unnecessary
jobs created to build voter bases and expand the power and influence of politicians and appointed
bureaucrats. It places a huge burden on those of us who do real work by having to deal with
their ineptitude and arrogance and having our hard-earned income taken to subsidize their
pampered existence. That said, there are
and employees that I highly regard, being primarily those who work in high technology fields.
Who can argue that, with the exception of many high ranking department appointments of political
nature, the rest of the people are typically very skilled...
Please Visit Comdel in
Appreciation of Support
are many reasons why Comdel RF power supplies,
DC generators and matching networks are used by the leading semiconductor equipment manufacturers,
solar cell / photovoltaics manufacturers and IC makers
the world. Our customers value the breadth of our RF generator product line, as well as our
experience, entrepreneurial spirit and commitment. Our combination of products and people
provides customers with advanced power supply technology, proven techniques and product reliability.
"Shoe" Comic Strip
Today's edition of the Shoe
comic strip had an amateur radio gag line. Enjoy.
Lack of Expert Leads to
Reversal of Patent Case
article by Bob Ambrogi, of IMS Expert Services, reports on how the ambiguous, objective nature
of the legal definition of a "Person
of Ordinary Skill in the Art" re patent interpretation was the basis for megacorp SAP
losing an infringement lawsuit on appeal. It illustrates the
of having competent, non-egotistical legal representation for what might otherwise be considered
an open-and-shut case. In this instance, the "little guy" prevailed due to having the best
legal team. Note:
periodically sends me e-mails that highlight recent key court cases that can significantly
affect the effectiveness of expert testimony, both for...
Thanks Much for Support
from Triad RF Systems!
RF Systems was formed in 2010 with the objective to solve the problem of HPAs being the
Achilles heel in most RF radios. We have solutions for integrating
high performance HPAs
into sophisticated RF subsystems and systems without sacrificing efficiency and linearity.
Call us to find out how we do it. Triad RF Systems serves all areas of the RF and Microwave
industries including military, satellite and commercial communications. Our products operate
from 10 MHz to 20 GHz.
"F-M" Put on Commercial Basis
after Edwin H. Armstrong demonstrated the viability of
FM for long distance broadcasting in January of 1940, the U.S. FCC allocated spectrum
to it in the 42-50 MHz band. Armstrong had introduced the FCC to FM originally in 1936.
The new modulation scheme was popular due to its immunity to amplitude related noise like
that generated by motors, automobile ignition systems, and lightning. However, World War II
broke out a little over a year later and most commercial radio advancements were put on hold.
This article from a 1940 edition of National Radio News could not have predicted
that, or the FCC's decision to relocate the FM spectrum to 88-108 MHz in 1945 in the
closing days of WWII. Some speculate that...
Fairview Intros Low-PIM
Mini-DIN 4.1/9.5 Adapters
Microwave Inc. has introduced
mini-DIN 4.1/9.5 adapters for applications requiring low PIM performance such as cell
sites or indoor/outdoor distributed antenna systems (DAS). Other
applications of these adapters include land-mobile
radio (LMR) communications, telecom installations, wireless infrastructure,
portable sweep testing, OEM in-rack RF routing, and in-building systems. Mini-DIN adapters
are similar to 7/16 DIN connectors, but are smaller with more precise electrical performance
and offer VSWR of 1.25:1 to 6 GHz.
Engineering, by David M. Pozar. Pozar's new edition of Microwave Engineering includes
more material on active circuits, noise, nonlinear effects, and wireless systems. Chapters
on noise and nonlinear distortion, and active devices have been added along with the coverage
of noise and more material on intermodulation distortion and related nonlinear effects. On
active devices, there's more updated material on bipolar junction and field effect transistors.
New and updated material on wireless communications systems, including link budget, link margin,
digital modulation methods, and bit error rates is also part of the new edition.
Please Thank BRL Test
Analyzer Repair for Support
absolutely know analyzer repair. Wouldn't
you like a friend like that on your side? Repair of your existing
is the most cost effective - period. Don't be pressured by the manufacturer into buying a
very expensive newer model just because they can't or won't do the repairs on yours. Our in-house
repair engineering group offers low pricing, experience (15 years on
average), military PMEL graduates, parts for repair in stock, warranty-90 days.
The Three Fives Kit:
A Discrete 555 Timer
I first laid my hands on a 555 timer IC
back in the early 1980s, it was Nirvana. Having recently separated from the USAF, working
as an electronics technician at Westinghouse Electric, and working on my electrical engineering
degree in night school, I was eager to learn about and adopt every bit of technology within
reach. No opportunity was missed to integrate the 555 into my designs for test fixtures and
experimental circuits. One such application was a custom timer that controlled a UV light
source for curing a particular adhesive we were using in a DoD classified project. Those were
exciting times. Signetics had introduced its NE555 in a decade earlier to provide...
Many Thanks to LadyBug
for Continued Support
in 2005, LadyBug Technologies manufactures the PowerSensor™ line of miniaturized
USB RF & microwave power sensors.
LadyBug manufactures high
average, pulse, and pulse profiling sensors with 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 measurements.
Map of Your Local Time
vs. True Sun Time
the switch to Daylight Saving Time just occurred
this weekend, it makes a good segue into the topic of time zones and shifts in general. The
map shown here was created by Stefano Maggiolo, who has a Ph.D. in geometry from SISSA, Italy,
on his "The poor man's math blog" web page, and is a Google engineer. His map depicts by what
amount, based on your position in a local time zone, your clock time differs from the local
sun time. Local sun time is relative to when the sun is due south, at its highest altitude,
when noon occurs. Time zones in most of the world are fairly evenly distributed in 1/24th
increments and do make fairly circuitous deviations around states, provinces and countries,
with a very obvious exception in regions of China. Some of China's time zones span...
Acquires ISO Certification
Microwave, a subsidiary of Electro Technik Industries (ETI),
is now certified to ISO: 2008 by SAI Global. Nova Microwave designs and manufactures
and circulators for RF and microwave commercial and defense applications. Nova Microwave
offers a number of different styles from drop-ins to surface mounts. The frequency ranges
from 380 MHz to 23.6 GHz with average power ratings from 2 to 250 watts.
is also the great driving force which we know under the name of religion. From religion comes
a man's purpose ; from science, his power to achieve it. Sometimes people ask if religion
and science are not opposed to one another. They are: in the sense that the thumb and fingers
of my hand are opposed to one another. It is an opposition by means of which anything can
be grasped. It is right, therefore, with all our heart to learn what will help us in the work
we want to do, so that when the call comes we can say, 'I am here...
Radio Control News
Printed Circuits & Capacitors
was just a decade after World War II, during which time the Army Signal Corps introduced
a method of printing - or etching - metallic circuit conductors on an insulator substrate,
and thus was born the
printed circuit board (PCB). The first boards used a phenolic-paper
laminate, which is the shiny brown substrate material that is still found in some industrial
applications like motors and control panels. Ferric chloride was used to etch away the copper
foil not masked off with photoresist chemicals. I made many crude PCBs using a resist ink
pen to draw circuit traces and component mounting pads, then etched away the exposed copper
with ferric chloride...
Win This 3-Volume Set
Handbook of Reflector
Antennas and Feed Systems
has been many years since I presented a questionnaire to website visitors in order to get
a measure of what people like or dislike and what new feature(s)
might be useful. In order to qualify as an entry, you must fill out the 15-question form
in its entirety. A winner will be randomly selected. As an incentive for you to take
a few minutes of your busy day to complete and submit the form, I am offering as compensation
a chance to win the 3-volume set titled
Handbook of Reflector
Antennas and Feed Systems: "Theory and Design of Reflectors," "Feed Systems," and
"Applications of Reflectors," published by Artech House. This represents a $627 retail value.
Physics & Engineering
Crossword for March 9, 2014
Sunday I create an
science-themed crossword puzzle using a word list that I personally created and added
to during over a decade of making puzzles. All of the words are related to engineering, science,
mathematics, chemistry, astronomy, etc. There are no numbnut clues about movie stars or clothing
Thanks to Dow-Key Microwave
for Their Support
Microwave is the world's largest manufacturer of electromechanical
switches for RF and microwave applications.
Founded in 1945, we are also the oldest
operating RF / microwave switch manufacturer in the U.S. Dow-Key specializes in customized,
high-performance coaxial, waveguide, and high-rel switches, as well as switching systems such
as RF matrices and system-level rack integration, programmable attenuators, and delay lines.
A Few Free Technical Books
(you pay shipping)
few of the technical books generously
donated by major publishers like Artech House and Cambridge University Press are not
likely to be selected by the RF Cafe monthly
Book Drawing winners, and have
been sitting on my shelf for a year or so. I would never consider selling them, but they do
deserve good homes because the information is very interesting. If you are willing to pay
for me to ship them to you, I will be glad to do so. If you would like any of the books below,
please send me an e-mail with your zip code...
API Intros Broadband
8-12 GHz Limiting Amplifier
Technologies announces a new broadband
8-12 GHz limiting amplifier ideally suited for demanding military
and high-end commercial applications such as microwave receivers, microwave telemetry systems,
uplink communications platforms, instrumentation, and military communications systems. It
features excellent output flatness of 1 dB that is independent of the input, and allows
for inputs levels from -20 to -10 dBm.
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.