[RFI] Nuremberg RFI?

[Hare, Ed, W1RFI]

The subject is rather complex.

First, most of the standards set RF exposure limits at 100 kHz and above.  A similar test is being conducted in Indiana in the US.  That system operates at 85 kHz, so technically there are no exposure limits.

Here is a link that outlines RF exposure limits:

https://www.icnirp.org/cms/upload/publications/ICNIRPrfgdl2020.pdf
ICNIRP GUIDELINES<https://www.icnirp.org/cms/upload/publications/ICNIRPrfgdl2020.pdf>
international commission on non-ionizing radiation protection icnirp publication – 2020 icnirp guidelines . for limiting exposure to electromagnetic fields (100
www.icnirp.org

The limits are time averaged.  The US system senses the presence of a compatible car and turns itself on for 300 ms.  The exposure will repeat at the next pad located some 3-5 meters away. In practice, these devices will be in operation only for operators of these special cars and only for a small percentage of the time.

The premise that "shielding" prevents exposure is marketing hype. These devices intentionally radiate magnetic fields,. Some "shielding" or the antenna design, could minimize radiation from anything other than straight up.

The real issue is EMI, from harmonics of the "transmitter" used to feed them. Even if perfectly stable, the US devices would have harmonics every 85 kHz well up into HF.  Also, as the devices turn on and off, what are the "key clicks" going to be like?

ARRL will be participating in the early testing of the US system later on this summer.
________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of JOHN LANGDON <WOYB10051 at outlook.com>
Sent: Wednesday, June 18, 2025 4:06 AM
To: 'RFI List' <rfi at contesting.com>
Subject: [RFI] Nuremberg RFI?

https://www.photon.info/en/news/germany-launches-first-test-track-for-inductive-charging-of-electric-cars-on-a-motorway/
Who wants to model this "antenna" even if "... appropriate shielding ensures that international safety standards for magnetic fields are met..."

73 John N5CQ


John Todd Langdon
305 Riello Dr
Greer SC 29650
512-203-4530 text or voice
Please note new email address woyb10051 at outlook.com<mailto:woyb10051 at outlook.com>

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