Tom,

It sounds like the speakers are picking the RF out of the air.  I don't 
think chokes, etc. will help in this case.  Others may have some ideas, but 
I'd say you're out of luck on this one.

Steve

----- Original Message ----- 
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 07, 2012 07:04
Subject: Interesting RFI Problem


> Hi, all.
>
> Well, I have an interesting little RFI problem here in the home shack that
> I've been scratching my head over lately.
>
> At the estate sale I've been talking about, I picked up a Realistic 
> 32-2040
> amplified speaker.  The speaker either runs on 6 C-cell batteries, or the
> supplied 9-volt wallwart.
>
> The speaker sounds terrific, with excellent quality  audio that I can 
> adjust
> in terms of tone and volume from the speaker itself.
>
> However, when I transmit with my TS590, using my amplifier, I get lots of
> RFI through the speaker itself.
>
> I have tried RF chokes on both the Wallwart power cord, and the phono plug
> connection between the Ts590 and the speaker itself, but no joy.
>
> I have tried running the speaker just on batteries, but still get the RFI.
>
> Obviously, this particular speaker is more susceptible to RFI than usual,
> since I don't get the RFI at all when using other speakers such as my
> Motorola amplified speaker or just a standard external speaker.
>
> Does anyone have any suggestions as to what else I might try?
>
> I'd love to use the speaker since it sounds so good, but the RFI issue may
> make that impractical in the long run.
>
> 73 from Tom Behler: KB8TYJ
>