Our local ambulance runs on NXDN 4800Kbps and sounds absolutely perfect. I'll bet one could get away with just half that bandwidth and still be acceptable.
Great work man, I’ve been looking into lora and hoping someone would develop it into some type of voip system. This could become invaluable in an emergency. I’m from new Orleans and work in emergency services, in my lifetime we have had 2 instances of a total communications blackout after a disaster.
What sort of range are you able to get with omni's? I guess first with a standard "rubber ducky" antenna and then maybe with a higher gain colinear antenna? Have you tried other directional antennas such as a Yagi or Moxon to see what sort of range can be had?
