Theoretical maximum, for PIC running @ 40Mhz and using Hardware USART for asynchronus mode is around 1.25Mbit, thus maximum speed for manchaster coding is 625Kbit... This does not look like Wi-Fi's 11 (or even 54 :lol: ) Mbit. Don't forget that your speed is limited by the transmiter module, and you have to implement some kind of error protection as well. If you plan on using this as "LAN", you should look for different solution... If 40Kbits are enaugh, this is a good way how to do it...