Steve,

good report.  I'm fixing to do the same thing just in case so thanks for 
reporting your experience.

Phil.



----- Original Message ----- 
From: "Steve Forst" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, March 14, 2011 5:46 PM
Subject: My friends the ferrites


> After making some changes in the station, and setting up the 480 with
> the solid state amp, I found a serious RFI problem on 15 meters.
> Anything more than 60 watts of computer generated cw caused things  to
> go crazy. The rig would lock in transmit and keep repeating stuff.  30
> watts RTTY caused the same problem.   If I tried the amp, the pc would
> either lock up, or sometimes reboot.
>
> At first I thought it was the 4 port USB to serial adapter.  It does rig
> control for 2 radios, also cw keying, and FSK keying.  After some head
> scratching and some trial and error, i  figured out it was the pc
> keyboard.  Put a split ferrite at the keyboard end of the cable and it
> resolved 80% of the problem.  Put 2 toroid doughnuts at the pc end of
> the cable, and all is well.
>
> 73, Steve KW3A
>