Hello, guys im a HAM radio user my call sign is YO3IGH and im looking for a way to generate 5 tones with a specific space between them 20ms and the tones with diferent frecvency value with the duration of 20ms aswell(EEA standard). This is caled 5tone signaling and is used in two way radios to identify radios, it wool be ideal to be able to decode them aswell but for now i wood be glad to be able to generate them. This is some info about the select five systems Selcall - Wikipedia. Please help me if you know a way to do this or a similar project with Arduino.
Thank you verry much 