[TenTec] High speed washer hum/whine

[Dr. Gerald N. Johnson]

On Sat, 2010-02-06 at 17:55 -0500, Phil Sussman wrote:
> It is most interesting this post has received the multitude of responses that it
> has without some feedback.
> 
> Since the washer is a newer type and it has been plugged in (we assume)
> properly, the idea of grounding issues only serves to discuss the possible means
> of coupling the generated source (from the Dryer) into the radio. The known fact
> this does NOT affect an older Drake unit serves to reinforce the
> belief that the source is more from the electronics - dc (if DC) motor brushes
> or other source. My thought is we're dealing with harmonics of a conversion 
> inverter. 
> 
> This can be easily verified by an oscilloscope and filtered accordingly at the
> source. 
> 
> Having seen such issues before, may I suggest contact with the customer service
> department of the company that supplied the washer. Believe it or not, they may
> be having a violation of FCC Part 15 regarding their electronics. If so, and the
> washer is new -- a warranty solution, eh?

Trane has had that kind of a problem with variable speed furnace fans
and has supplied a filter to fix the problem.
> 
> Forgive the excessive bandwidth.
> 
> 73 de Phil - N8PS
> 
> -----------
73, Jerry, K0CQ