How to build a VHF digital radio based on FSK?

[koukileo]

Hello everyone. I want to design a VHF radio system based on digital voice (similar to DMR). I want to record the voice in real time through a microphone and modulate it into FSK, and then send the signal through the radio. Finally, the receiver decodes the FSK signal received through the VHF radio. Revert to voice.

I don't know how to implement it, I have attached my code.
By the way, can the encryption function be implemented?

 

[ahovhann]

Hi,

Which devices you are using in your project ?

Look at the following link, where describes the FPGA-Based SDR and Its TR Implementation Using NI-USRP

https://www.intechopen.com/chapters/53537

[RTSLVU]

That's a rather daunting task...

You said "like DMR" but from what I understand DMR does not directly digitize your voice and send it over the air.

DMR uses a proprietary CODEC chip that converts your voice into phonemes and basically tells the receiver what phonemes to play back. No digitized sound is actually sent over the air like a cellular phone or other commercial digital radios.

That's why everyone sounds the same on DMR.