Thread: N900 radiation with GSM internet connection
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cpitchford is offline cpitchford
2010-04-16 , 00:09
Posts: 303 | Thanked: 175 times | Joined on Oct 2009 @ London UK
#26
Originally Posted by ChoMar View Post

The diagnostics may be difficult. The comparison with the FM - Trasmitter doesnt really work since we have to take Frequency in to account. The problems with speakers is also due to the Frequency, as far as i know.
The example with the FM transmitter is quite relevant. It is not the frequency, it is the fact the transmitter in the phone is turning on and off rapidly.. the tone of the buzz on the speakers is not resonance, or anything to do with the broadcast frequency it is the tone of the transmitter being turned on and off..

this is why it is goes d-d-d-duuur... the longer sounds are longer periods of broadcast, the short clicks are usually idle periods when little data is being broadcast (ie you're being quiet)

Originally Posted by ChoMar View Post
Without any resonance the signal would be much to weak to interfer with the Keyboard (or Speakers) i think.

Is the Keyboard connected via PS2 or USB? Cause then some HW-Geek could find out the Frequency this Standarts work with and than we could do some simple math to check if the Frequency of the Mobile is a direct multiple. Are other Keyboard functions influenced?
It is far more likely to be a saturation issue.
10Khz versus 1900Mhz? That's like a bat trying to talk to a blue whale.. they won't be able to hear each other at all (190000 times more rapid!)

If sufficient voltage is induced in the cable, then it would might be sufficient to upset the primitive cpu in the keyboard.. The frequency probably doesn't have too much to do with this..


The IR receiver, btw, is because it is designed to pick up very quiet signals from the IR receiver.. any eletrical noise next to such a device an upset it.. I've seen that a few times..
 

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