Not everyone who visits RF Cafe is a seasoned
hobbyist, technician, or engineer. Some are newcomers to the realm and are in search
of knowledge to educate and encourage them. This 3-volume set of
Encyclopedia of Electronic Components is a contemporary printing
of modern day parts. All standard passive and active types are covered, as are topics
like sensors and human input, audio, heat, light, sound, and much more. A couple hundred
reviewers give the books 4.5 stars ...
"Millimeter wave signals were more found to be more robust than expected
and provided high speeds - although not gigabit speeds - at distances of several thousand
feet from a node, Signals Research Group found in recent testing of Verizon's 28 GHz
fixed wireless access network in Houston. 'Millimeter wave signals are far more resilient
than we expected, even at distances exceeding several thousand feet. Tree foliage, passing
school buses, buildings, glass ..."
Spark Kicks off 5G Era in New Zealand
with Live Trial
"New Zealand telecom operator Spark announced
what it claims to be the country's first
live 5G mobile test site in Wellington. The 5G trial used equipment
and technical support from Chinese vendor Huawei. It will test speeds, coverage and the
parameters of the spectrum in a real-world environment, and run throughout March connecting
equipment in a specialized vehicle drive-testing the streets of Wellington. 'We intend
to be at the forefront of deploying this technology in New Zealand once ..."
"It seems like the FCC's recent interest in doing
an in depth study of the growing RF spectrum
has taken a new twist. The FCC's apparent lack of real action in gathering the data needed
to make serious inroads into RF noise pollution has drawn the attention of the ARRL,
which voiced their concerns in a recent ARRL Letter as well as in their formal response
to the FCC. The ARRL 'took the opportunity to strongly urge the FCC to reinstate a 2016
TAC noise floor study, which, ARRL asserted, apparently was terminated before it even
got started.' It would seem ..."
"Narrowband Internet of Things (NB-IoT) has reached
critical mass as network operators all over the world have announced their deployment
plans. Last year, the NB-IoT market was driven by a handful of operators, primarily in
Asia and Europe. U.S. operators Verizon, Sprint and T-Mobile have started to fast track their
NB-IoT development. By the end of 2018, most of the U.S., Europe
and Asia Pacific will be covered by at least one NB-IoT network. Despite the early lead
by unlicensed Low Power Wide Area ..."
"Miniature MEMS-based speakers could revolutionize
speech and music reproduction in mobile communication devices. They combine the advantages
of a large frequency bandwidth and high acoustic quality with the ability to generate
very high sound levels. Nevertheless, they are so tiny that they can be integrated into
headphones. Such micro-loudspeakers were developed by the Fraunhofer Institutes for Digital
Media Technology (IDMT) and Silicon Technology (ISIT). MEMS technology stands for microelectromechanical
systems and combines classical ..."
Microwave Journal is conducting along with National
Instruments and Wolfspeed a webinar titled, "Introduction to Radar," on Wednesday, March 28, 2018, at 11:00 AM.
Mr. Scott Bullock presents on the topics of radar detection and ranging, pulse vs. CW,
radar modulation, radar path budget, basic radar equation, radar range equation, range
ambiguity and mitigation, maximum and minimum detectable range, and more ...
"While the mobile industry is done with its annual
Mobile World lovefest - held last month in Barcelona - tech suppliers, system OEMs, and
mobile operators now face a host of 5G obstacles not yet overcome. In fact, they’re just
getting started. The technical issues of 5G are manifold. Among them, smart antennas
front ends for 5G mmWave - typically expected to operate at frequencies such as 28
GHz, 39 GHz, or 60 GHz - could seriously affect the performance of yet-to-emerge 5G mmWave
mobile phones ..."
Transient Specialists, a leader in electromagnetic
compatibility rentals for over 30 years, announces that they will be offering rentals
NSG 5500 by Teseq this coming May. This compact Automotive immunity transient test
generator allows for testing for to meet standards of ISO, SAE, DIN and JASO, and many
others. Transient Specialists, conveniently located in the mid-west, offers a variety
of EMC test equipment rentals to accommodate your testing needs. Our rentals include
technical support on the equipment, weekly and monthly ...
Believe it or not
Radio Shack is still open for
business both online and in some brick and mortar locations. They have some really good
prices on clearance (aka going out of business) parts that you might need. I just ordered
some connector adapters, coin cell batteries, and antenna mount kit for dirt cheap. Shipping
is free for a minimum $39 purchase. Use coupon code RADIO15 to get an additional 15%
Anatech Electronics, a manufacturer of RF and microwave
filters, has published its February newsletter. In it, Sam Benzacar notes the impressive
of rapid transformation of T-Mobile from virtual insignificance in the wireless world
to the top of the hill. He cites Open Signal's January 2018 report titled, "State of
the Networks: USA" as evidence. Sam offers his take on the reason for T-Mobile's success
and for why Verizon and AT&T fell behind. As usual, it's a worthwhile read ...
Admittedly, I needed to look up the meaning of
when seeing the title of this tongue-in-cheek article by Carl Kohler in the July 1969
issue of Popular Electronics magazine. Nobody knows for sure whether the over-enthusiastic
starring male in the series of techie stories that ran in Popular Electronics magazine
in the 1950s was actually Carl himself or an alter ego version of himself. Carl was also
the artist of numerous tech-related comics. This episode deviates a bit from the already-married
type to report on the exploits of born loser Otto Tronix ...
The available bandwidth of RF channels are often
limited by the bandpass characteristic of filters, amplifiers and mixers. Detecting amplitude
flatness and phase distortion is crucial in characterizing the quality of a transmission
channel. The amplitude flatness within the used bandwidth may have an influence on the
signal quality. Knowledge about phase distortion is essential to maintain low bit error
rates in data transmissions and VNAs commonly perform amplitude flatness and phase distortion
"In a new study, researchers from the U.S. Department
of Energy's (DOE) Argonne and Brookhaven National Laboratories observed the formation
of two kinds of defects in individual
nanowires, which are smaller in diameter than a human hair. These
nanowires, made of indium gallium arsenide, could be useful for a wide range of applications
in a field scientists have termed optoelectronics, which encompasses devices that work
by converting light energy into electrical impulses. Fiber optic relays are a good example ..."
Everyone who is interested enough in microwave
diodes to read this article surely knows* what IMPATT, GUNN, and PIN diodes are, but
have you heard of Read-effect, TRAPATT, LSA, or QMD diodes? If not, it is likely because
you entered the microwaves field long after 1969 when this edition of Electronics
World was mailed to subscribers. Device improvement and obsolescence accounts for
familiarity with the former and unfamiliarity with the latter, respectively. The article
below by two Sylvania Electronic Products engineers describes the properties of various
Here is a brand new book being offered by the ARRL:
Receiving Antennas for the Radio Amateur, by Eric P Nichols
(KL7AJ). "Although the fundamental characteristics of antennas apply to both transmission
and reception, the requirements and priorities of receiving antennas can be vastly different
from those of transmitting antennas. Receiving Antennas for the Radio Amateur focuses
entirely on active and passive receiving antennas and their associated circuits. There
are relatively few cases where a radio amateur ..."
Mayors vs. the
International Space Station Astronauts Calling "CQ Students"
AT&T Deal Raises Questions About Value of 5G Spectrum
Southwire Recalls Wi-Fi Switches Due to Fire Hazard
Former Qualcomm Chairman Reportedly Seeks Financing to Buy Company
MPs Summon Mark Zuckerberg and Accuse Facebook of Misleading Them
Wolfspeed Buys Infineon's Radio Frequency Power Business
Navi Mumbai Becomes Fastest 4G City in India
Selling to Telcos in the Age of Digital Transformation
In an ongoing effort to provide the best return
on investment to RF Cafe website sponsors (aka advertisers), I have decided to allocate
the 728x90-pixel banner ad slot at the bottom of all web pages to companies who participate
High Exposure plan. That is in addition to the other features that have always been
included. The cost is still only $150 per month; i.e., no price increase. A full list
of advertising options is available on the Sponsorship
Rates page, but just the features which are part of the High Exposure plan are highlighted
in the screen capture ...
"Satellite communications have been in use for
decades now, providing connectivity to remote areas, acting as backup in disaster relief
situations, and being a major access mechanism for TV in certain parts of the world.
Satellite use has been vital for government, military, and remote operations, while geostationary
orbit (GEO) satellites are providing global coverage for voice, TV, and, in some cases,
broadband Internet services. The
telco industry is now working toward the standardization and commercialization
of the next generation of cellular standards ..."
A lot of RF Cafe visitors might not be familiar
with some of the electronic devices presented in this
Electrochemistry Quiz by Popular Electronics' resident quizmaster, Robert
Balin (a big list of his other quizzes is at the bottom of the page). I offer my
assistance. A is a photocell, B is an early type of rectifier, C is a varistor, D is
a cathode ray tube (CRT), E is an electrolytic capacitor, F is a heated cathode in a
vacuum tube, G is a flashlight battery, H is an early receiver crystal detector, I is
a magnetic audio recording tape, and J is phonograph cartridge. I scored ...
"During Exercise Northern Warrior 2018, 35 Canadian
Brigade Group (35 CBG) Communications Detachment did an impressive job of testing and
solving problems. The detachment's two objectives were to provide high-quality communications
to the Arctic Response Company Group (ACG) personnel and test new equipment in an arctic
environment. 'The arid and austere environment of the Canadian Arctic requires effective
communications. The work done by the G6 35 GBC team has undoubtedly demonstrated the
relevance of the
HF communications that are essential to operate effectively in this
hostile climate ..."
"Measurements of the three-dimensional structure
of the earth, as opposed to the one-dimensional models typically used, can help scientists
more accurately determine which areas of the United States are most vulnerable to blackouts
geomagnetic storms. Space weather events such as geomagnetic storms
can disturb the earth's magnetic field, interfering with electric power grids, radio
communication, GPS systems, satellite operations, oil and gas drilling and air travel.
Scientists use models of the earth's structure and measurements of Earth's ..."
Earthlink no longer provides Internet service in the
Erie area, and they want to charge a monthly fee to retain the current e-mail address,
which is not worth the expense. Accordingly, please note that effective immediately
RF Cafe's primary e-mail address will be firstname.lastname@example.org. The Earthlink e-mail
will be kept for a month or two so as not to miss any useful message, but please begin
using the Yahoo e-mail now. I apologize for any inconvenience.