APRS References

Many thanks to the many people who have come before me and done great work to document and implement the bits of APRS that I was able to study.

APRS Message building:

• (link) A thesis paper on the current state of APRS, as well as its history and implementation issues

• (link) Page showing matlab implementation results for CRC calculation, provided nearly the only bit-for-bit input example I could find

• (link) Page going over the message format and other difficulties in implementation

• (link) APRS Spec

• (link) AX.25 Spec

Physical transmission:

• (link) MicroModem - Arduino / ATmega328P implementation of APRS transceiver

• (link) Page about how to make cable to interface between phone (APRSDroid) and Baofeng handheld radio

• (link) Radiometrix HX1 144.390-3 datasheet

• (link) Blog with discussion about how to diagnose why over-the-air transmission doesn't work but wire-to-wire does

• (link) SDR# software for working with software-defined-radios

• (link) Amazon page for NooElec SDR

• (link) Page discussing details of physical representation

Misc:

• (link) AllAboutCircuits page talking about how to set up 16MHz crystals for ATmega328P