From: jeremy@goopypanther.org   
      
   I definitely recommend ferrite beads on your usb cable.   
      
   Is the SDR encased in a metal shield box? If not I'd highly recommend it   
   too, since there will be many more sources of interference that just   
   your PC. Shielding the USB cable will only remove once source of noise   
   but shielding the SDR will protect you from all of them.   
      
   On 08/23/2014 11:29 AM, Bob wrote:   
   > Hello,   
   >   
   > Regarding those Ferrite EMI Suppression "tubes" that are placed over   
   > signal wires to reduce noise, might someone please offer a bit on how   
   > used, and how effective they are ?   
   >   
   > I have a small SDR radio Dongle that is connected to my PC via a USB cable.   
   >   
   > There appears to be a fair amount of noise being picked up on the radio   
   > that is being radiated/induced from the PC, I believe.   
   >   
   > e.g., should they be placed over both ends of the USB cable, at both the   
   > PC and at the radio Dongle ends ?  Or, only at one end ?  Why ?   
   >   
   > I'll experiment, of course, but would like to hear your opinions on first.   
   >   
   > Any thoughts on this would be most appreciated.   
   >   
   > Thanks,   
   > Bob   
   >   
   >   
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