Re: [RFI] Wireless Power Transfer with electric vehicles

[Tom Thompson <w0ivj@tomthompson.com>]

I looked at the video and 6:50 into it there is a proposed schematic 
that has a classic switch mode power supply circuit.  At 21 kW, that is 
really going to create a lot of RFI unless they do a great deal of 
filtering.
Tom   W0IVJ

On 4/11/2021 9:58 AM, Michael Aust via RFI wrote:
> Here a technical discussion on these
> Wireless RF chargers that will destroy
> HF for city dwellers for sure !
>
> https://m.youtube.com/watch?v=iOVg62_DUYU
>
> Mike
> WB6DJI
>
> Sent from my iPhone
>
> > On Apr 11, 2021, at 8:52 AM, Michael Aust <wb6dji_dx@icloud.com> wrote:
> >
> > These RF chargers like the Qi for iPhones is being proposed as Automobile RF 
> > Chargers for Hybrid cars now and are basically RF oscillators generating Lots of RF in 
> > the HF Bands
> >
> > 20kW RF oscillators!!!!
> >
> > https://m.youtube.com/watch?v=CEGlmQS692w
> > Qi RF Charger
> >
> > This Will destroy the HF HamBands
> >
> > Mike
> > WB6DJI
> >
> >
> > Sent from my iPhone
> >
> > > > On Apr 10, 2021, at 4:28 PM, James Gordon Beattie Jr <w2ttt@att.net> wrote:
> > > Ed,
> > > The bottom line question will be whether in a housing sibdivision with homes  
> > > with two EV chargers each, can they peacefully coexist with low profile 
> > > HF/VHF/UHF antennas in attics, around gutters and on flag poles?
> > >
> > > The pressures of domestic electronics technology and HOAs and 
> > > deed/convenant-restricted communities are at crossed purposes with respect to 
> > > Amateur Radio.
> > >
> > > 73,
> > > Gordon Beattie, W2TTT
> > > 201.314.6964
> > >
> > > Get Outlook for Android<https://aka.ms/ghei36>
> > >
> > > ________________________________
> > > From: RFI <rfi-bounces+w2ttt=att.net@contesting.com> on behalf of Hare, Ed, W1RFI 
> > > <w1rfi@arrl.org>
> > > Sent: Saturday, April 10, 2021 3:21:20 PM
> > > To: jim@audiosystemsgroup.com <jim@audiosystemsgroup.com>; rfi@contesting.com 
> > > <rfi@contesting.com>
> > > Subject: [RFI] Wireless Power Transfer with electric vehicles
> > >
> > > Oh, it's worse than the little Qi chargers, Jim.  We are talking 20kW chargers 
> > > for electric vehicles and ARRL and IARU are very concerned about harmonics and 
> > > inverter noise.  Right now, they are using magnetic loops, which are resonant, 
> > > but also need filtering,, which at the 20 kW level Is not trivial.  The key is 
> > > to get the right limits set.  ARRL has been helping to revise a few industry 
> > > position papers, and although we don't always see eye to eye, we are making a 
> > > difference and, more important, planning ongoing work.  Much like BPL, the goal 
> > > is not to stop technology, but to help identify proper EMC solutions. With BPL, 
> > > HomePlug  did it and HomePlug devices deployed successfully by the millions.
> > >
> > > Today, I am in the Lab, gathering the wiring and adapters I need to finish the 
> > > installation of  1.5m loop and active whip on a trailer to tow behind my van, 
> > > to get away from vehicle noise. I am headed out to two large solar farms in 
> > > Connecticut, just to get a feel for the EMI that may be present near them 
> > > locally.
> > >
> > > I get to have all this fun on weekends sometimes, too!
> > >
> > > -----Original Message-----
> > > From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of Jim Brown
> > > Sent: Saturday, April 10, 2021 3:14 PM
> > > To: rfi@contesting.com
> > > Subject: Re: [RFI] Ed Hare W1RFI Contact Info?
> > >
> > > > On 4/10/2021 11:58 AM, Hare, Ed, W1RFI wrote:
> > > > I have three major issues come up with wireless power transfer,
> > > Great to hear that you're engaged on this, Ed. My RFI alarm went off years ago 
> > > when I heard the first rumblings about this for use in charging widely used 
> > > consumer devices.
> > >
> > > 73, Jim K9YC
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