I am explaining in this blog details on how to create a radio signal transmitter along with a reciever. A transciever comes packaged developed by Great Scott Gadgets named HackRF One. This is a Software Defined Radio (SDR) which means it can be connected with laptop and can be used using a software. A basic idea of the hardware along how to connect it with laptop is provided in below video.
How to Connect - https://www.youtube.com/watch?v=MvbFeehxmME
For purchasing the HackRF One and proper documentation the following link can be used which is the official website of HackRF One.
Official Website and Purchase - https://greatscottgadgets.com/hackrf/one/
Note that radio transmission is illegal in some countries and is abided by local regulations!
