[amsat-bb] Re: clarification : audio interference

Edward Cole kl7uw at acsalaska.net
Mon Apr 21 18:48:31 PDT 2008

Get some ferrite donuts and wind the speaker leads thru them a couple 
times.  You may have to use ferrite chokes on the power lead to the 
speaker, also.  The real expensive solution is to buy RFI immune 
computer speakers from MFJ.  On your wife's computer speakers solder 
a disc ceramic capacitor across the leads menioned, above (probably 
.001 mfd, rated for 500v or 1kv).  For HF RFI one could use .01 mfd.

I think Radio Shack is carrying some clamp-on ferrite beads that 
might go on easy.  If you notice these are now standard on the VGA 
leads to computer monitors!  The Computer folks are beginning to learn.

This works for stereo RFI as well.

GL & 73,
Ed - KL7UW

At 03:33 PM 4/21/2008, w0dxz at aol.com wrote:
>Let me modify that...? my original info was relayed from my wife... 
>"you are getting into the neighbors TV"... after talking with the 
>neighbors,,, I am NOT into their TV, I am being heard through her 
>computer speakers...
>how do I solve this now that I know where it is... she is hearing 
>audio on her speakers...? I am glad it is this rather than? TVI through cable.
>Bob W0DXZ
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