By B.N. Frank
American opposition to 5G deployment is increasing due to a variety of confirmed issues associated with the technology – one of them being aviation safety risks (see 1, 2, 3, 4, 5, 6, 7, 8, 9). Nevertheless, 5G proponents (including the Federal Communications Commission) continue to endorse funding and activating the controversial technology as soon as possible (see 1, 2). They’ve run into a snag, though, due to intensifying attention being given to aviation safety risks. One industry insider has proposed a solution.
From Fierce Wireless:
The FCC keeps creating interference issues — Madden
We’ve heard about delays in C-band commercialization, as several pilots’ organizations have popped up with concerns about interference. Let me explain why this question was inevitable, and why it’s so difficult to resolve completely.
First of all, here are the basics: The FCC has chosen to clear the 3.7-4.0 GHz band of satellite users, to replace directional satellite links with high-power mobile links transmitted in all directions. This is a real change in the nature of the energy in the 3.7 to 4.0 GHz band.
The concern is that a change in RF emissions would impact radar altimeters that use an FMCW radar at 4.2 GHz. This radar system is critical to pilots because this is their primary way to determine their height above the ground.
The FCC, as a government agency, regulates the use of spectrum, and it’s clearly their responsibility to license spectrum in a way that ensures no interference between these systems. They try to do that by regulating the transmitters. In short, they only try to control the emissions, and they assume that receivers will only receive the signals in their desired band. If it was this simple, a 200 MHz guard band would be enough.
Unfortunately, in the real world the receivers are not ideal. The filters on the front end of the receiver are typically designed for the actual field environment, not for any regulatory standard. That means that radar altimeters have been manufactured for 30 years using wideband filters on the receiver to improve performance and save cost. Thousands of aircraft are flying around in the USA with wide filters on their receivers, because they never had problems with the satcom links in the 3.7-4.0 GHz band.
A very similar situation happened with Lightsquared in the GPS band. The FCC re-allocated L-band spectrum from satellite use to terrestrial use, and did not realize that a new terrestrial system would cause massive problems for GPS receivers in the adjacent band at 1.575 GHz. Everyone built GPS receivers to be very small, and that required wideband receiver filters that were open to a new, unplanned source of interference. So, even though Lightsquared had a legal license to use the band, their venture was strangled before it could get started.
In the case of C-band, several OEMs have analyzed the interference issue and in general the mobile industry has reached a consensus that the radar altimeters should be safe. I agree, and I have not reduced my forecasts.
However, a typical pilot is not convinced. Of course not! After all, it is their butt in the seat and they are responsible for the lives of their passengers. So the industry needs to support a rigorous and comprehensive review of all FMCW radar altimeters built over the past 30-40 years and the mobile industry should make allowances for any aircraft that will be impacted. (Sorry, I shouldn’t say that aircraft will be impacted. Let’s say “affected”).
It won’t do any good to tighten the specifications for spurious emissions. This is not an issue of base stations emitting too much energy at 4.2 GHz. The issue is that legal high-power signals at 4.0 GHz will be coming into the altimeter, and the altimeter will be confused. So, instead of re-testing the 5G base station the FCC needs to kick off a process of testing the radar systems to fully understand the vulnerability of every model ever built.
Joe Madden is principal analyst at Mobile Experts, a network of market and technology experts that analyze wireless markets.
“Industry Voices” are opinion columns written by outside contributors—often industry experts or analysts—who are invited to the conversation by FierceWireless staff. They do not represent the opinions of FierceWireless.
Of course, other serious issues have been associated with 5G as well including
- Cybersecurity risks (see 1, 2, 3, 4)
- Environmental risks (see 1, 2, 3, 4, 5, 6)
- Health risks (see 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
- Privacy risks (see 1, 2, 3)
- Weather forecasting satellite interference risks
- Utility infrastructure interference risks
The FCC has catered to the telecom and cable industries for decades (see 1, 2, 3). This has led to numerous lawsuits filed against the agency for NOT protecting the public from unsafe levels of cell phone and WiFi radiation (see 1, 2, 3), 5G on Earth (see 1, 2, 3, 4, 5) and in space, and also for allowing telecom and cable companies to overcharge Americans (see 1, 2, 3).
Earlier this year, scientists submitted a letter to President Biden asking him to protect the public from 5G and other unsafe technology. Instead he continues to commit to adding more – most recently with additional government funding via the Infrastructure Bill (see 1, 2, 3), much of which will likely be spent on 5G. Americans opposed to any or all of this may sign and share the following online petitions 1, 2, 3.
Activist Post reports regularly about the FCC, 5G, and other unsafe technology. For more information visit our archives and the following websites.
- Americans for Responsible Technology
- 5G Information
- 5G Space Appeal
- Stop 5G International
- Wireless Information Network
- Electromagnetic Radiation Safety
- Environmental Health Trust
- Physicians for Safe Technology
- Scientists for Wired Tech
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