[RFI] Help on speed drive motor controller RFI

Tom Rauch w8ji at contesting.com
Mon Jan 29 18:07:40 EST 2007

> When I said the speed controller did not have any RFI 
> filters fitted, I
> meant it was not using the separate, optional RFI and 
> "dV/dt" filters
> offered as options by the manufacturer. I actually don't 
> know if the
> controller has any type of RFI filtering inside.
> I have to agree that even performing to EMC standards, and 
> I am sure this
> one is not, the RFI from this controller is absolutely 
> unacceptable for weak
> signal reception.  Just from the beginning I anticipated 
> this would be a
> very tough RFI problem to deal with due to proximity and 
> tremendous QRM
> levels.

What type of controller do you have? Who makes it? What is 
the model?

They are all cureable, and many times all it takes is a 
shield box with good filters. It is very easy to knock HF 
noise down a hundred dB or more if the enclosure that houses 
the controller and filters is built correctly.

73 Tom 

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