Anatech Electronics, a manufacturer of RF and microwave filters, has
published its October 2015 newsletter. As always, it includes both company news and some tidbits about relevant industry happenings. This month,
Sam Benzacar theme is "Spectrum Pollution: A Silent Menace." He discusses a test run by a spectrum monitoring setup that recorded
thousands of independent signals in the 2.4 GHz ISM band in an urban environment, illustrating how saturated our environment is with RF
energy, and making you wonder how anything even works under those conditions. It's no wonder cellphone and OIP calls are often so crappy.
Oh, how I miss the old twisted pair landline telephone calls, with never the need to ask, "Can you hear me now?"
Spectrum Pollution: A Silent Menace
By Sam Benzacar
Pollution of the electromagnetic spectrum is something very few people think about. After all, you cannot sense it or otherwise detect
its presence "organically". But you know it's there if you listen to AM radio, your microwave oven and Wi-Fi "collide", and in many other
ways you simply take for granted as a nuisance. But the simple fact is that every electrical or electronic device emits radiation, some of
it at very low frequencies, and the rest scattered throughout the spectrum used by everyone from amateur radio operators to wireless carriers.
To prove this point, I recall a story told me by an associate about one of his clients located in Virginia near Washington, D.C. that
manufactures very-broadband spectrum recorders that capture signals off the air. The systems ingest areas of spectrum up to 1000 MHz wide
for spectrum monitoring and surveillance purposes. When his company was testing a prototype a couple of their engineers stuck a length of
wire into its antenna terminal and recorded the activity within 200 MHz of bandwidth centered at 2450 MHz where Wi-Fi, Bluetooth, and other
services operate. The length of the recording was only 1 minute.
In this time, the company's proprietary software counted nearly 6,000 emitters of various signal strengths and waveforms, even though
the system (and the wire) were inside the building. They were so amazed at the result that they opened up the bandwidth to 500 MHz, and counted
nearly 80,000 emitters. As signals at this frequency are not typically very strong nor travel very far, the interference was coming from
relatively close by. It's safe to assume that if they made their recordings at a lower frequency such as 700 MHz where signals travel further,
they would have recorded even more signals.
Such is the electromagnetic environment we have created, in which the ability to communicate is stymied by the sheer number of fundamental,
harmonic, and spurious signals that are present in urban and suburban environments. And it's safe to assume that as the number of devices
of various kinds proliferate, the problem will become worse and worse. And remember, we are soon to have a whole new class of machine-to-machine
emitters thanks to the coming boom in connected devices.
I don't have the answer to the increasing problem of spectrum pollution, nor do I suspect does anyone else, but it may ultimately become
so overwhelmingly difficult to deal with that "something" will have to be done.
In the meantime, Anatech Electronics offers, as it has for more than 25 years, solutions for an enormous array of interference problems
that can be dealt with using RF and microwave filters. We're here to help when you need it. Please call us at (973) 772-4242 or send us an
email by clicking here.
The Source of Really High RF Power Remains Strong
Think TWTs, klystrons, gryotrons, and other Vacuum Electronic Devices (VEDs) are ready for the history books? No so fast. ABI Research
in its report "Microwave and Millimeter Wave High-Power Vacuum Electron Devices: One of Electronics' Original Technologies is Going Strong"
values their global market at a stable $1 billion or more. The reason is that there is no other technology that can generate anything close
to the enormous amounts of power that "tubes" can produce, and some applications, such as some radars, scientific and medical systems, and
satellite communications systems, need it. ABI Research Director Lance Wilson summed it up nicely: "In some cases there is no other way to
generate such high levels of RF power within an acceptably small space. Certain microwave and millimeter-wave VEDs can generate megawatts,
and it would take tens of thousands of transistors to do that."
The Sad State of U.S. Download Speeds
You'd think America would be a world leader in LTE download speed from wireless carriers, but the truth lies elsewhere. Specifically,
at the bottom of the list. According to a report from Open Signal from whom the chart below was taken, the U.S. is below every other country
on the list, at a paltry 10 Mb/s. The report itself is excellent reading, if you can stand to be frustrated.
Open signal link.
Radar Find Long-Lost Graves
As a result of many people trying unsuccessfully to find and identify family members buried at the Santa Clara Cemetery, the Village of
Santa Clara, NM, called in specialists to use ground penetrating radar. The problem, as reported in the Silver City Sun-News, is that some
families had no money for headstones and used piles of rocks and wooden crosses instead, and with the rocks being disrupted or the crosses
withering away, there was no obvious way to find and identify them. Graves marked with headstones, field stones, or mounds accounted for
only about two-thirds of the 1,397 burials but the radar revealed 497 that had been lost in the cemetery's 149-year old history. Metal crosses
are now being made to locate them in the hope that family members will come to identify them.
DoD Secretary Promises to Protect Cyber and EW Research Funding
Defense Secretary Ashton Carter told attendees at a DARPA conference in St. Louis that DoD intends to protect funds designated for research
into new space, cyber, and EW weapons, owing to rapid technology developments by China and Russia that are letting them catch up to the U.S.
This is not first time Carter has expressed his concern over the issue and DoD has of late made strong statements about how urgently the
agency needs to collaborate with private industry to harness commercial capabilities in order to speed leading-edge developments. The result
for companies serving these markets is increased funding not likely to be hacked out of the budget.
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 October 14, 2015