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 MLS.
Please Welcome RIGOL
Technologies as an
Technologies is an emerging T&M leader and a technology innovator
in electronic measurement. RIGOL's premium line of products including:
Power Supplies, Signal Generators, and
Waveform Generators. The
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 RF applications.
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
4-Way Power Divider
Electronics has released new designs for a 862.5 MHz
cavity bandpass filter, an 2422 MHz cavity bandpass filter for
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
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
quality factor ("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
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
AN/ALQ-99 Tactical Jamming System to be used by the US Navy and
the Australian military. Under this option,
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
government jobs 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
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
comic strip had an amateur radio gag line. Enjoy.
Lack of Expert Leads to
Reversal of Patent
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.
IMS ExpertServices 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
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
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
Wouldn't you like a friend like that on your side? Repair of your
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
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
Radio Control News
Printed Circuits &
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
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
Physics & Engineering
March 9, 2014
Sunday I create an
engineering- and 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 designers. Enjoy.
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
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
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
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
Technologies announces a new broadband
8-12 GHz limiting amplifier ideally suited for demanding
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 knowledge of
music power rating.
AWR Announces Winners for
Taiwan U. Student
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
Material World is an independent distributor and market maker of
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
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...
Please Thank LadyBug
Technologies for Support
in 2005, LadyBug Technologies manufactures the PowerSensor™ line
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
Congrats to Dean F.,
Our February Book
F., of Suwanee, GA, is the February 2014,
RF Cafe book
drawing winner. Dean selected
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
RF Cafe software products, or sent me an e-mail asking t obe
entered. The book was Graciously provided by
Cambridge University Press
Sodom & Gomorrah,
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
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...
Free Vintage Electronics
is your chance to own a pile of
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
Many Thanks to MECA
Electronics for Support!
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.
Components of America
Hacking the Van Allen
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...
Energy Conversion Quiz
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.
Amazing Collection of QSL
Cards & Photos,
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
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...
R&S Adds Liquid-Cooled
to EMC Line
Schwarz now offers up to 10 kW of power in a frequency
range from 9 kHz to 225 MHz with its
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.
Please Visit Anatech in
Electronics designs and manufactures the industry's widest range
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.
R U Sitting Comfortably?
Old Time Radio
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 to you.
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
Are Employees Working
More Jobs for No Pay?
Giant Resumes Fail to
Thanks for Support
by to Windfreak Technologies
Windfreak Tech designs, manufactures, tests and sells high value
radio frequency products such as
generators, synthesizers, power detectors, mixers, upconverters
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. A 1x/10x
is included. The price from Amazon is less than $90 with free shipping.
If you need more bandwidth, the
Owon HDS1021M provides a 20 MHz BW and also has a multimeter
function for a tad over $200.
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 home toolbox.
PMI Intros 14-40 GHz, 10-Bit
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 typically.
a Music Player
I first saw this video, I thought it was a satire. The video is
a for-real commercial promoting the new
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...
Delta Electronics Releases New
Series Data Sheet
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...
Thanks Once Again to Z-Comm
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.
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.
Notable Tech Quote
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.
Physics Crossword Puzzle
for March 2, 2014
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.
Many Thanks to 3Gmetalworx
1994, leading wireless electronics companies have relied on 3Gmetalworx
to deliver cutting edge solutions for advanced
RF/EMI PCB-level 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.
Station Design for DX - Part II
I of this article appeared in last month's
(September) edition. It introduced concepts in
antenna types 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
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Station Design for DX - Part I
Rockwell wrote a 4-part series on
station design 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.