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Re: Computer noise

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  • Martin
    Ambrogio, see http://www.rfsystem.it - soundcard galvanic isolator. 73 Martin 9A2JK
    Message 1 of 4 , Jul 22, 2013
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      Ambrogio,

      see http://www.rfsystem.it - soundcard galvanic isolator.

      73
      Martin 9A2JK

      --- In GenesisRadio@yahoogroups.com, Ambro_IW2FVO <iw2fvo@...> wrote:
      >
      > Hi Bruce,
      > may I have some indication about the audio line isolator ?
      > Thanks
      > Ambrogio
      >
      >
      > ________________________________
      > From: Bruce kf1z <kf1z@...>
      > To: GenesisRadio@yahoogroups.com
      > Sent: Wednesday, July 17, 2013 7:32 PM
      > Subject: Re: [GenesisRadio] Computer noise
      >
      >
      >
      >  
      > PC noise can be a PIA.
      >  
      > First, try snap on ferrites on all cables leading to PC
      >  
      > In the case of a laptop, it may be the display, in which case, I don't
      > think there is a solution.
      > But grounding  ( or UNgrounding the radio may help)
      >  
      > For a desktop pc, unfortunately the power supply is likely missing the AC
      > line filter components. Very common.
      > There is space on the PCB in the power suplly, but the components are
      > missing.
      >  
      > I have installed filters in my PC power supplies, but I will not recommend
      > it or give the particulars ( don't want to be liable etc.  )
      >  
      > But, most electronics suppliers do have filters that plug into the power
      > cord at the back of the PC.
      > OR you can replace the power jack on the power supply with a  filtered
      > unit.
      >  
      > Of course, you would want to do some tests to prove that is the
      > issue.
      >  
      > May be the display and not power supply.
      >  
      >  
      > If these are both laptops...
      > I guess I'd try grounding or ungrounding the case of the 735, or G11
      > for G11, you can also try unplugging the USB cable, see if the noise level
      > drops...
      > Try ferrites OR ( what I do ) is use a audio line isolator for the
      > line-input cable.
      >  
      > If the noise is present ONLY when the charger is connected to the laptop,
      > try ferrites on the power cord before and after the charger unit.
      > also try plugging the charger into a different outlet than the power supply
      > to G11
      >  
      >  
      > There are lots of ways to try... a little experimentation with a wire to
      > different ground points can help eliminate issues.
      >  
      > Unfortunately, there is no single, straightforward solution to each
      > different setup!
      >  
      > Bruce
      > kf1z
      >  
      >  
      > From: John Owens
      > Sent: Wednesday, July 17, 2013 8:46 AM
      > To: GenesisRadio@yahoogroups.com
      > Subject: [GenesisRadio] Computer noise
      >  
      >  
      > I have a G11, which I like very much. I have noticed that when I turn on the
      > computer for the G 11 (asus Netbook) that background noise level in my IC 735
      > goes. Up 2-4 S units. I also tried a Dell 410, and it was worse. Is this also
      > increasing the noise floor and sensitivity on the G11 and what can I do about
      > it.
      >
      > John Owens K6TViY
      >
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