[EAS] Next Generation

[Bill Ruck]

It is even older than you think.  KNBC (now KNBR) had STA from the 
FCC to FSK the carrier for the USN in the late 40's and 50's.

I am told that the frequency monitor meter would go nuts when this happened.

The main issue is not technical -- we know it can work -- but 
political.  Who is going to maintain the equipment?  The days of a 
minimum two union engineers on duty at a 50 kW clear channel 
transmitter site are long over.

Bill Ruck
San Francisco

At 11:21 AM 11/16/2014, you wrote:
>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