A DRM AM transmitter can support long-distance Emergency Warning Functionality (EWF) coverage from outside the disaster area being received just in the concerned area.
The DRM AM digital audio broadcasting standard provides flexibility and also carries extra information that can be displayed on the car radio or standalone screens without flattening batteries as quickly as with cellular phones.
All major digital radio standards have some disaster warning feature provision. Using one content server, one box, to feed several DRM for FM transmitters can be a quick solution.
The author, Ruxandra Obreja, is chairman of Digital Radio Mondiale.