Induction cooktops and RFI?

Karl W4KRL W4KRL at
Thu Apr 12 21:43:37 CDT 2012


Induction cooktops operate between 24 and 50KHz. There is probably a lot of potential for RFI near the range.

73 Karl W4KRLTerry Fox <tfox at> wrote:Thanks Andre!  My spec an only goes to 3GHz.  The whole idea was to know what they (induction cooktops) do BEFORE I buy one.
Maybe you could camp out at the local Sears with your spec an, and test for me??
From: André Kesteloot
Sent: Thursday, April 12, 2012 8:11 PM
To: Terry Fox
Cc: mailto:andre.kesteloot at ; mailto:tacos at
Subject: Re: Induction cooktops and RFI?
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?
Terry, WB4JFI


We don't have an induction cook-top, but
isn't the induction coil powered by the 60Hz mains ?
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.
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