[EAS] Next Generation

[RobertM]

What you describe has existed for about 10 years, AMSS 

http://www.etsi.org/deliver/etsi_ts/102300_102399/102386/01.02.01_60/ts_102386v010201p.pdf

Although originally designed to complement DRM, it is basically RDS for AM with extra data capability. It is ruggedly coded to withstand skywave and uses phase modulation. It could easily be made compatible with HD radio. 


> On Nov 16, 2014, at 10:42 AM, Mike McCarthy <towers at mre.com> wrote:
> 
> I'm also going to go out on a limb and suggest another very secure means. 
> Ultra slow speed embedded data sent sub-sonically on a select group of AM
> clears. With hyper-narrow band receivers able to reject all but the
> strongest of noises and IX, a 10 baud signal under constant and continious