[TenTec] OT: Acoustic Silencing Switching PS Transformers

[Wade Staggs]

Two Words ........... Silicone Sealant.........


On Wed, Jun 25, 2014 at 9:03 PM, Kim Elmore <cw_de_n5op at sbcglobal.net>
wrote:

> This is admittedly off-topic, but if any expertise exists I figure it will
> be among the denizens of this list.
>
> I have a Kenwood TS-930S with the Piexx enhanced microprocessor board
> installed. That board uses a small, on-board switching power supply. The
> board works flawlessly, as does the rig. The problem is that the
> transformer, which uses a two-piece ferrite core, "sings" at a frequency
> that I can't hear, but that my kids can and find annoying. Chris at Piexx
> said to squeeze the transformer a bit and, in messing with it, I'll
> probably silence it. Indeed, I managed to do so and in the process found
> several situations where even I could hear it and it was surprisingly loud
> , but the problem has returned. Chris is sending me a metal clip that is
> now used on the transformer in hopes that it will permanently solve the
> problem.
>
> If the clip doesn't do the trick, can I get away with getting the
> transformer silent and then applying Q-Dope or some thinned epoxy to hold
> it in whatever position keeps it quiet (sort of a half-baked potting
> process)? Or will that, instead, guarantee that I'll never be able to fix
> it if the ferrite halves shift a tiny bit as everything sets up?
>
> Kim N5OP
>
>
>
> --
>
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>
> /"In theory there is no difference between theory and practice. But, in
> practice, there is." //-- Attributed to many people; it's so true that it
> doesn't matter who said it./
>
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