Re: [Discuss-gnuradio] noise problem with USRP

[ematlis]

Chris-

thanks for the suggestions.  I may try to add the ferrite toroid.  It's 
just curious that I didn't notice this before.  Maybe my power brick is 
functioning differently, although it is brand new.

thanks,
eric

On Mon, 18 Jun 2007, Chris Albertson wrote:

> --- address@hidden wrote:
>
> > I'm seeing a strange noise issue with my USRP.  I have a simple
> > antenna
> > fashioned out of a spool of wire connected to a LF-DC daughterboard
>
>
> So if (1) antenna is connected and (2) you are using notebook
> connected to mains then you see 120Hz noise.  So I think the
> noise comes from the power brick and enters via the antenna.
>
> Sounds like the notebook power supply or the cables it
> connects to radiates RF.  Not surprizing at all for a
> switching power supply
>
> Try installing some ferrite toroids on both of the cables on
> the power brick.  Use as many turns as you can through the
> toroid.
>
> Another option is to use an antenna that is farther away from the
> power brick and bring the signal back using a long coax feed line.
> Use the inverse square law to your advantage.
>
>
>
> Chris Albertson
>  Home:   310-376-1029  address@hidden
>  Office: 310-336-5189  address@hidden
>
>
>      
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