Mike:

I just tried the speaker with batteries, and no speaker cable connected at 
all, and still got RFI through the unit when using my amp on 20 meters at 
about 600 watts.

So, obviously, the speaker itself is not very RF resistant.

It's too bad, since it is such a nice-sounding speaker.

73 from Tom Behler: KB8TYJ

----- Original Message ----- 
From: "Mike Duke, K5XU" <[log in to unmask]>
To: "Tom Behler" <[log in to unmask]>
Sent: Tuesday, May 08, 2012 8:02 PM
Subject: One Other Thought about the RFI in the Speaker


> Tom,
>
> Those were great speakers. I had one for a number of years before
> something in the amplifier died. I never tried it with any of my
> transceivers, so I can't say whether or not mine had a problem with
> RFI.
>
> Have you tried seeing if the RF gets into it with the speaker turned
> on, running on battery power, but with no audio cable connected to it?
>
> By removing all external cables, including the audio input, you can
> determine whether the RF is coming in on the audio cable or not.
>
> I suspect it is getting in through the internal wiring of the
> amplifier itself. In that case, fixing it may be a real trick. You may
> need to begin with ferrite beads on the leads between the speaker and
> circuit board, and on the leads between the circuit board and battery
> holder.
>
> Just 2 more cents for your knowledge bank.
>
>
>
>
>
>
>
>
> Mike Duke, K5XU
> American Council of Blind Radio Amateurs
>
>
>