Tom,

Do you get RFI if you run barefoot?  If not, you may have some 
amplifier-specific issues.

Steve

----- Original Message ----- 
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, May 09, 2012 20:31
Subject: Re: One Other Thought about the RFI in the Speaker


>    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
>>
>>
>>
>