3 ms·
This reminds me of those stickers that one could put on your GSM a hundred years ago which lit up when there was an incoming call. Similar principle at work in
by toothbrush 11y ago
This reminds me of those stickers that one could put on your GSM a hundred years ago which lit up when there was an incoming call. Similar principle at work in this demonstration: https://youtu.be/CNJVhzOjWgU?t=12s https://youtu.be/CNJVhzOjWgU?t=12s
- sugarraps 11y agoHa! So that's how those worked. Nice to know. :)
- ChuckMcM 11y agoWow the comments on that video, my eyes , my eyes! I got a nice EMC probe for my oscilloscope (so that I could look at the effectiveness of my bluetooth antenna trace) and it provides a nice way to scan a phone for all of the various RF frequencies its putting out. One thing I thought was interesting is that when you put your phone in a shielded box (so that you're only seeing the phone's radiated signals) it bumps up the xmit power in the GSM bands trying to talk to a cell tower it can't reach. Seems a little mini StingRay on your dresser to reassure your phone that cell service is nearby would help its battery life :-)