Induction cooktops and RFI?

André Kesteloot andre.kesteloot at
Thu Apr 12 19:11:01 CDT 2012

Well ,I have here a spectrum analyzer that goes to 200 MHz.

Buy me a similar cook- top, have it delivered free-of-charge to my castle, and I shall be pleased to investigate whether it nastily radiates  HF waves, or not .
This service will be at no charge to you 

Sent from my iPhone; eventual mIstAkEs should be blamed on the thickness of my fingers :-)

On 12 Apr 2012, at 19:48, "Terry Fox" <tfox at> wrote:

> From: Andre Kesteloot
> Sent: Thursday, April 12, 2012 6:59 PM
> To: tacos at ; Terry & Judy Fox
> Subject: Re: Induction cooktops and RFI?
> On 4/12/2012 18:31 PM, Terry Fox wrote:
>> Does anyone use an induction cooktop, and can tell me if there is any RFI from it to ham bands?
>> Thanks
>> Terry, WB4JFI
> Terry, 
> We don't have an induction cook-top, but
> isn't the induction coil powered by the 60Hz mains ?
> 73
> André
> I was more worried about the control circuitry, and if there is a solid-state switching of the element.  Since induction is designed to radiate a magnetic field (albeit at 60Hz?), if that field is controlled by higher-speed devices, there might me more radiation?  Or not..
> Do they do PWM for the control?  It also seems that there are a lot more “steps” in the control than a traditional electric cooktop.
> Terry
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