[Noisebridge-discuss] iPhones and speakers (RF help please)

[Jeff Keyzer]

Rick,

You can use ferrites to try to stop the interference, but in my  
experience it can be really tricky to completely get rid of it.  GSM  
noise is really hard to eliminate.  But it's worth a shot.

HSC in Sunnyvale has a huge variety of ferrites to choose from.   
Better yet, find some old cables you don't need any more that have  
ferrites on them (those big lumps at the ends of the cables) and cut  
them off for reuse.  Loop the wires around the ferrite a few times and  
see if it makes a difference.  There are also clamp on style ferrites  
that are easier to use and will work on cables with fat connectors on  
the ends.  Old USB cables and modem cables usually have ferrites.   
Some old AC cords for PCs have them too.

Jeff Keyzer
jeff at mightyohm.com



On Feb 16, 2009, at 3:20 PM, Rick Wesson wrote:

>
> I have an iPhone (though i suspect this is also an issue with other  
> 3G phones)
> in that my computer speakers, cisco phone, and my mike (when giving a
> presentation) often pick up some of the radio transmissions from my  
> phone.
>
> Is there any alternative to moving my phone away from my speakers,  
> desk phone,
> etc to keep from picking up the interference.
>
> I was thinking about placing a coil on my speaker wire and then  
> thought you
> folks could save me a trip to Radio Shack (our mouser/didgakey) to  
> get the next
> nifty part so I can keep my cell near my other devices w/o the  
> interference.
>
> -rick
>
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