[AMRadio] Telephone Wiring RFI Treatment

Larry Knapp kc8jx at yahoo.com
Sun Dec 17 20:01:31 EST 2006

Mike - I was successful getting rid of RF in my desktop computer speakers by using a split ferrite
core choke from MFJ by wrapping about four turns of the speaker leads around the choke then
closing the choke.  Never have rf into the computer speakers now when using any rig or even when
using my SB-200 at full power.  It's worth a try.
73, Larry KC8JX

--- W4AWM at aol.com wrote:
> Since the problem is only there on 40 meters, one or both speaker leads may 
> be resonant at the frequency used.  Try ferrite cores on the leads or change 
> the lead length making sure they are nor resonant on any of the ham bands you 
> use.  73, John,  W4AWM
**** Mike W3slk wrote:
> My problem with this has always been keeping RF out of the computer speakers 
> on 40M. Its the only band I seem to have RF problems with and it comes 
> regardless whether I'm running low power or QRO. Any suggestions would be 
> greatly appreciated.  Mod-U-Lator, Mike(y) W3SLK 

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