Audio D/A idea

I have a screwy idea about building a low cost digital wireless 2-way radio using the A/D input on a pic, some of the 433 mhz low power xcvers, and a D/A converter on the other side.

The question is, can the PWM function in PicBasic be used as a D/A converter with enough accuracy and granularity to accurately reproduce the human voice? I know the 10 bit A/D's are sufficient, but the PWM command shows only 255 steps. Does this mean I only get 8 bit resolution from PWM? Also, can sound even be reproduced in this manner? The Sound command does not look like it would be sufficient due to the limited granularity (127) of the frequency range reproduced.