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Re: [RFI] Whirlpool 465 Oven Door Latch Solenoid RFI

To: "RFI Reflector" <rfi@contesting.com>
Subject: Re: [RFI] Whirlpool 465 Oven Door Latch Solenoid RFI
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 10 Jan 2010 10:23:31 -0800
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Sat, 9 Jan 2010 17:12:57 -0600, Ward Silver wrote:

>the next step will likely be adding ferrite corres to the controller 

Remember to wind enough turns through the cores to move their 
resonance down to the frequency range that excites the problem. 

Some other thoughts. 

Consider the current path of the relay as an RX antenna (or magnetic 
loop). If possible, rewire it with twisted pair, so that the signal 
return is twisted with the hot lead. Doesn't matter for DC, but it 
sure does for RF. You don't need to break the other return path -- RF 
will follow the path of least impedance (inductance), which is the 
twisted pair. 

If there is some sort of high-Z sensing circuit that drives the 
controller, try a bypass cap across it. 


Jim K9YC

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