Anatech Electronics, a manufacturer of RF and
microwave filters, has published its August 2015 newsletter. As always, it includes both company news and some tidbits
about relevant industry happenings. This month, along with presenting some relevant industry news tidbits, Sam Benzacar discusses the importance of assuring high integrity RF cable and connector installation. Being a major manufacturer
of connectorized filters, Anatech Electronics' products rely on proper interconnections to help guarantee
specified performance. Filter responses are dependent upon the impedances of the input and output ports being
very close to design-for values - typically 50+j0 Ω or 75+j0 Ω. Anything else will result in a
curve that deviates from the shape obtained when tuning into a calibrated network analyze; the greater the
impedance, the greater the deviation from 'ideal.'
FM Radio Coming to Smartphones
In what seems like an announcement that ought to have been issued a long time ago, T-Mobile and Sprint are incorporating
over-the-air FM radio chipsets in their Android phones, according to Fierce Wireless. Sprint added it in 2013. Verizon
Wi-Fi For Surveillance
According to researchers at University College London (UCL), they have found a way to allow Wi-Fi signals to
penetrate walls using Doppler shifts. The system compares the signals from a reference channel and a surveillance
channel to monitor Doppler shift. It can work with 802.11 b, g, n and ac standards, GSM, and LTE. Unlike radar used
for this purpose, the UCL design is a passive one-way system (not using signal reflections) that make it undetectable
providing security for military and law enforcement use. MIT is also in the game, developing Wi-Vi, which device
uses active radar, while another group uses particle filters to analyze small shifts in frequency and uses Sequential
Importance Resampling (SIR) filters for greater accuracy.
Farmer Takes Broadband Into His Own Hands
Having become fed up with pitifully-slow Internet access on his Salisbury Plain (UK) form, farmer Richard Guy
Salisbury Plain has homebrewed his own solution, according to the Daily Mail. As his LTE service was a lot faster
what he got in his home (1 Mb/s), he built a wooden mast to which he attached a solar-powered LTE adapter, put it
in a waterproof toolbox, and connected the signal to his house with a fiber optic cable. He now gets a blazing 69-Mb/s
download speed. Of course, Guy also has IT experience which certainly helped
A Drone To Record Your Wedding
Looking a lot like Uber, Droners.io has launched a business Droners.io that connects people local, professional
drone pilots to film your wedding, real estate, surf session, and whatever else you'd like. Pilot positions are
available. You pay the pilot by project or per hour, depending on how you negotiate the deal. Once the pilot is
done, you get an invoice that have a week to review. After that you use Droners secure payment platform with a debit
or credit card.
Charlotte Pushes for Doppler Weather Radar
The Charlotte, North Carolina area is one of the few places in the U.S. that the National Weather Service Doppler
Radar system doesn't cover, so Senator Richard Burr and Congressman Robert Pittenger are bringing the Metropolitan
Weather Hazard Protection Act to Washington. If passed, the new law would require all cities of 700,000 people or
more to have direct coverage of a Doppler radar. The nearest systems are in Raleigh, Blacksburg, Virginia, and Grier,
South Carolina, but they don't fully cover western North Carolina. Burr says the new radar would cost $15 million
and would include federal funding.
DoD To Scale Up Drone Flights
The Pentagon plans to expand the number of daily drone flights by 50% over the next 4 yr., according to the Wall
Street Journal, in areas such as Ukraine, Iraq, Syria, the South China Sea, and North Africa, the first increase
since 2011. Although the Air Force conducts most flights including those for the CIA, the new plan will also use
Army and Special Operations Command assets, as well as government contractors. Daily flights would increase from
61 to perhaps 90 by 2019.
Giving Cables and Connectors Their Due Respect
By Sam Benzacar
As it pertains to RF and microwave cables and connectors, Rodney Dangerfield got it right: "they don't get no
respect". In fact, they're some of the most overlooked components in every system, which often turns out to be a
mistake especially but not exclusively in systems that will be operated in hostile environments. They're crushed
by everything from boots to trucks, bent far beyond their maximum bend radius, and subject to a remarkable number
of abuses that even the high-quality cable could never endure.
look at cable integrity, for example. The outer conductor or shield has the job of minimizing loss, keeping the
signal from radiating along its length potentially causing interference, and ensuring performance by maintaining
a fixed distance between the center conductor, dielectric, and outer conductor. Cable manufacturers take great pains
to maintain very high tolerances between these components as together they determine the cable's performance.
However, when they're kinked, bent too far, or crushed, this symmetry is disrupted, causing discontinuities at
various places along their length, increasing impedance mismatch (reflected power), hot spots when they are handling
high RF power levels, and in general reducing receive or transmit performance. In the transmit path, severe impedance
mismatch dramatically reduces RF output leaving the cable's far end and can destroy the RF power transistors in
the amplifier. In the receive path, signal strength will be dramatically reduced. Abuse can also reduce shielding
effectiveness causing the signal to radiate along its length. When radios are in close proximity and there are tens
of hundreds of feet of cable in a small space (in a base station, for example) it's a breeding ground for interference.
Another of the many potential problems you can encounter is simply specifying the wrong type of cable for its
intended application. Shipboard installations in salt water are a classic case as they are often continuously exposed
to salt spray, which has a way of finding its way into places that seem impenetrable. The result is corrosion that
can result in reduced cable (and connector) life, increased Passive Intermodulation Distortion (PIM), and sometimes
outright failure. As there is generally no practical way to completely avoid exposure to salt spray, cables and
especially connectors must be clearly identified as being satisfactory for marine use – and why. When they are exposed
to aggressive chemical the cables must be made to (and advertised as) resistant to it.
Connectors suffer the same fate, as their components are equally subject to abuse from ham-handed installation
(and sometimes reinstallation) when they can be overtightened, their center conductors bent, or just screwed on
improperly. It's essential to make sure that whomever is doing the installation recognize that this isn't like plugging
in a 120-V power connector – these are precision components.
The necessity for this increases with frequency, as high-frequency connectors are small and very delicate. In
hostile environments, connectors can suffer even greater potential damage than cables as most of their components
are partially or fully exposed and susceptible to contamination from whatever environmental hazards are present
in the environment, from salt spray to salt or fresh water and chemicals.
So when you're specifying RF and microwave cables and connectors, please contact us before you start as we can
steer you to the proper cable and connector combination based on their operating environment. You can reach us at
(973) 772-4242 or by email at
You can also view all our standard and custom products by
About Anatech Electronics
Anatech Electronics, Inc. (AEI) specializes in the design and manufacture of standard and custom RF and microwave filters and other
passive components and subsystems employed in commercial, industrial, and aerospace and applications. Products are available from an
operating frequency range of 10 kHz to 30 GHz and include cavity, ceramic, crystal, LC, and surface acoustic wave (SAW), as well as power
combiners/dividers, duplexers and diplexers, directional couplers, terminations, attenuators, circulators, EMI filters, and lightning
arrestors. The company's custom products and capabilities are available at
www.anatechelectronics.com and standard products are available for purchase at the Anatech Electronics integrated Web store
Anatech Electronics, Inc.
70 Outwater Lane
Garfield, NJ 07026
Posted August 23, 2015