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</div>quarta-feira, 19 fevereiro 2020, 01:53da tarde +00:00 de João Costa > CT1FBF <a href="mailto:ct1fbf@gmail.com">ct1fbf@gmail.com</a>:<br><br><blockquote id="mail-app-auto-quote" cite="15821203930000063817" style="border-left:1px solid #0878BD; margin:0px 0px 0px 10px; padding:0px 0px 0px 10px;">
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<div id="style_15821203930000063817_BODY">Radio frequency exposure test finds an iPhone 11 Pro exceeds the FCC's limit<br>
<br>
A test by Penumbra Brands to measure how much radiofrequency energy an<br>
iPhone 11 Pro gives off found that the phone emits more than twice the<br>
amount allowable by the U.S. Federal Communications Commission.<br>
<br>
The FCC measures exposure to RF energy as the amount of wireless power<br>
a person absorbs for each kilogram of their body. The agency calls<br>
this the specific absorption rate, or SAR. For a cellphone, the FCC's<br>
threshold of safe exposure is 1.6 watts per kilogram. Penumbra's test<br>
found that an iPhone 11 Pro emitted 3.8 W/kg.<br>
<br>
Ryan McCaughey, Penumbra's chief technology officer, said the test was<br>
a follow up to an investigation conducted by the Chicago Tribune last<br>
year. The Tribune tested several generations of Apple, Samsung, and<br>
Motorola phones, and found that many exceeded the FCC's limit.<br>
Penumbra used RF Exposure Labs, an independent, accredited SAR testing<br>
lab for the tests (The Tribune also used the San Diego-based lab for<br>
its investigation). Penumbra was conducting the test, which also<br>
included testing an iPhone 7, to study its Alara phone cases, which<br>
the company says are designed to reduce RF exposure in a person.<br>
<br>
It's worth noting that when the FCC conducted a follow-up<br>
investigation they did not find evidence that any of the phones exceed<br>
SAR limits. "That said, while the Tribune and Penumbra both used<br>
off-the-shelf phones, the FCC largely tested phones supplied by the<br>
manufacturers, including Apple," adds IEEE Spectrum.<br>
<br>
Joel Moskowitz, a researcher at UC Berkeley, says that could be<br>
because there's a systematic problem with RF Exposure Lab's testing<br>
methods, or Apple rigged the software in the provided test phones to<br>
ensure they didn't put out enough power to exceed the SAR limit.<br>
Either way, both McCaughey and Moskowitz agree that the FCC's RF<br>
exposure testing is woefully out of date, as the limits reflect what<br>
the FCC deemed safe 25 years ago.<br>
<br>
Read the IEEE Spectrum report:<br>
<a href="https://spectrum.ieee.org/tech-talk/telecom/wireless/radio-frequency-exposure-test-iphone-11-pro-double-fcc-limits" target="_blank" >https://spectrum.ieee.org/tech-talk/telecom/wireless/radio-frequency-exposure-test-iphone-11-pro-double-fcc-limits</a><br>
<br>
• Our thanks to Stephen, G7VFY for spotting this item<br>
<br>
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