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Comment Re:Colors (Score 1) 127

For exactly the same reason that you can't fit an infinite number of AM radio stations into a finite width of radio spectrum. The act of AM-ing a single frequency carrier f_c at data rate / frequency f generates sidebands each side of the carrier, so that the signal now spreads over (f_c - f) to (f_c + f), i.e. the bandwidth becomes (IIRC) 2f. Fleetie

Comment Re:Well... (Score 2) 317

The concentrated spot of light cannot even be quite 1 x the brightness of the sun. Never mind ">5000 times brighter". The laws of thermodynamics say so. You cannot focus an image of a light source so as to make the intensity at that focus more intense than the light source itself. Kudos for good execution of his idea, but that ">5000 times brighter" claim is just plain wrong.
Communications

Testing and Mapping a Cellular Data Network? 114

bgsneeze writes "In order to resolve an ongoing issue with a vendor, I have been trying to find a way to test different 3G data devices empirically. I would like to be able to chart signal strength, latency, and bandwidth. I would also like to create a map of the coverage area. I have a test 3G card from three different providers. I would like to be able to travel with the setup to several different locations and run tests. What software or techniques would Slashdotters use to test the different devices? Are there any free or open source software packages that will do this?"

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