Hi,
I'm looking to use RF frequency from cell phones to generate sounds (not eavesdrop on people's conversations). I know that cell phone transmissions are digital, but is it feasible to build an antenna to pick up digital noise that's generated by cell phone usage?
Thanks!
That could be done, but RF circuits are not easy to build and you might need some specialized equipment to test & tune your circuit. Personally, I wouldn't try to build an RF receiver or transmitter from scratch.
You might be able to "hack" a cell phone, but "good luck" figuring-out and modifying the high-density circuit boards with tiny surface-mount components.
I know that cell phone transmissions are digital, but is it feasible to build an antenna to pick up digital noise that's generated by cell phone usage?
Since it is digital, and it is compressed, simply demodulating the signal and converting it to audio is going to literally sound like noise (if there is much in the audible frequency-range at all). But, you could detect the signal and then generate sounds that are not noise-like.
Short range detection of cell phone RF transmissions is very simple. See this post WiFi detector. - Sensors - Arduino Forum