US$5 instead of US$30 and a system cost might stay below US$50, transmitter included. However, in recent years, the ability to receive as well as send using cheap microcontrollers (such as the Atmel AVR or the Motorola 68HC08 families) has been demonstrated. It seems, however, that any new system that is not compatible with the current Bell 202 modulation is unlikely to be widely adopted. The current modulation seems to fulfill sufficient need that little motivation exists to move to a superior design, especially if the new design requires significant hardware purchases. Most recently, a wholly new protocol with forward error correction has been created by Nino Carillo, KK4HEJ, called Improved Layer 2 Protocol (IL2P). See also Packet radio Automatic Packet Reporting System (APRS) FX.25 Forward Error Correction Improved Layer 2 Protocol (IL2P) References Further reading AMPRNet a project to construct a global, radio-based network using TCP/IP over AX.25 links Linux-AX25.org a site dedicated to packet radio on Linux AX.25 Layer 2 a web site established to be a concise repository for AX.25 layer 2 design activities APRS Bob Bruninga's official APRS website TARPN Tadd Torborg KA2DEW - Terrestrial Amateur Radio Packet Network site AX.25 Specification Packet radio Link protocols X.25