Re:Count the people around you by monitoring wifi signals
by gsich on Thursday January 17, 2019 @11:23PM
(#18937017)
RTL-SDR won't get you most LTE bands, 1800, 2100, 2600 MHz will be quite challenging.
Re:Count the people around you by monitoring wifi signals
by bigiain on Saturday January 19, 2019 @10:41PM
(#18950855)
If you buy carefully you can usually get 1800 on a TV Tuner with the right chipset. You can get to 2.4GHz with a satellite downconverter if you haven't by then bought in enough to buy a (way) more expensive SDR.
Re:Count the people around you by monitoring wifi signals
by gsich on Sunday January 20, 2019 @12:28AM
(#18951355)
E400 goes to around 1.7 GHz, R820T to about 1.85 GHz, which doesn't cover the full LTE band, so yes it's pretty shit at the higher frequencies, 10$ won't get you anywhere there.
But then you are not in the price range anymore.
You can do this with just receive though. A $10 USB TV Tuner and a Raspberry Pi will listen in to most cellular bands, and pull enough out of the over-the-air machine to machine chatter to do a similarly accurate job of counting cellphones...
The cellular transmitters (can)_ run with a lot more power than Wi-Fi, and are on lower frequencies, so the range at which you'll detect them is significantly longer, which might make localised device counting less useable.