Hi everybody,
Anybody please tell me, Can we Transmit and Receive Voice from these 433Mhz RF Link.?
433Mhz RF Link!
If 'YES' please tell me from where i should start.
Thank you very much
Transfer rate: 4KB / S
I suspect that should say 4kb / s, so I'd say, no, you can't do voice.
Using XBees.?
The TMRh20 is an awesome set of libraries. Even for audio: GitHub - nRF24/RF24Audio: Arduino library for streaming data/audio from analog inputs via NRF24L01 modules
The 433MHz modules are probably not good at 4kbps. They are more 2kbps. Due to legal restrictions, they may be active only 1/10 of the time. That is 200bps. That is 25 bytes per second, and let's assume 5 bytes overhead. The final result is 20 bytes per second.
THanks Koepel I'll look into that. 
For the cost of an Arduino and radio module, you could by a Baofeng handheld.
Finally reviving this thread!
Technically: YES!
And I did it, because I want to build a very very crude and simple walkie talkie.
The idea is to modulate the voice to a variable PWM signal, like it's done in class-D amplifiers.
This PWM signal is a digital signal we can now transfer using those generic 433MHz modules.
Obivously because of the low transfer rate, we can only use a modulating frequency of (I tested and found working) around 10kHz. Therefore the audio quality is bad, but certainly enough for voice.
With 10kHz, I even got a range of more then 100m!