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2010-04-15
, 19:46
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Posts: 91 |
Thanked: 22 times |
Joined on Apr 2010
@ Germany
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#22
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However, I have already seem similar behaviour with an ethernet Cat5 cable and an IR receiver. While transferring data over the ethernet cable laying next to the IR receiver, the receiver's LED was flashing. I wass searching about 15 minutes for a remote control someone must be sitting on
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2010-04-15
, 20:02
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Posts: 203 |
Thanked: 375 times |
Joined on Nov 2009
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#23
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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?
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2010-04-15
, 20:18
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Posts: 91 |
Thanked: 22 times |
Joined on Apr 2010
@ Germany
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#24
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Oh! And we have tried to reproduce the same using a Huawai USB GSM/UMTS Modem and the same service provider. It didn't work...
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2010-04-15
, 21:08
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Posts: 203 |
Thanked: 375 times |
Joined on Nov 2009
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#25
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The Clock frequency of a PS/2 Keyboard is something between 10 and 17 kHz, if i remember correctly. What service provider do you use?
i dont know if we can work with the informations, then. but we could try to do some math, maybe we find a correlation.
Yeah, playing with high frequencies is an interesting field...youll never know what happens. GSM isnt THAT high (with WLan everything is possible, even transdimensional connections. But its also possible that a connection fails if the devices are 5m away from each other) but its high enough to be quite unpredictable.
Could be that you managed to place you device in the EXACT right angle or something else. Polarity is the thing to take into account here. And much other things.
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2010-04-16
, 00:09
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Posts: 303 |
Thanked: 175 times |
Joined on Oct 2009
@ London UK
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#26
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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.
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?
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2010-04-16
, 00:14
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Posts: 37 |
Thanked: 5 times |
Joined on Mar 2010
@ Bethesda, MD
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#27
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2010-04-16
, 09:07
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Posts: 186 |
Thanked: 192 times |
Joined on Jan 2010
@ Finland
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#28
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Thats strange. The shielding of the Ethernet Cable is very good and should work both ways...
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2010-04-16
, 20:47
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Posts: 1,258 |
Thanked: 672 times |
Joined on Mar 2009
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#29
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2010-04-17
, 02:52
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Posts: 4,930 |
Thanked: 2,272 times |
Joined on Oct 2007
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#30
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If you call it "interference" and not "radiation" it sounds less scary. It is normal. And I haven't see it at all with my n900, which tells me it is probably the difference in the 3g frequencies from AT&T and TMobile.
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Magnets (particularly stationary ones) will have no effect on a wire with no current.. when current passes through them, the wire will try to move in the magnetic field.. this is how motors work.. it is not going to cause a problem with a keyboard.
The "duh-d-d-duh-d-d-duh-d-d-duh" sound people may recall hearing from speakers when GSM phones were nearby is caused by poor filtering on the speakers.. interference is picked up by speaker wire/audio cable/whatever.. .Since GSM (and 3G) transmitters pulse on and off rapidly, this makes it harder to filter.. Here's an example:
a 100W FM transmitter next to a 1995 TV wouldn't necessarily cause any problems because the radio signal is of a constant strength.. However, turn the transmitter on, you get a snap of interference.. turn it back off, again another snap..
This is the same thing that causes clicks on the TV screen when your refrigerator motor turns on / off..
It is CHANGE that causes the problems like this.. and a GSM transmitter is constantly turning on and off..
Speakers (more accurately amplifiers) and TVs are immune to this NOW because the filters got better..
Your keyboard may not be sufficiently filtered for a) a pulsating radio source like the phone, or b) for a constant but high frequency transmission.. Either way, this is going to be rare and doesn't indicate a problem with anything other than your keyboard..
It won't have any affect on a human because we're not subject to interference, we're affected by absorbtion.. that's very different.