[EAS] Alerting options

[Tom Spencer]

Mike McCarthy wrote:

> ...[A]  single centrally located low 
> band station could cover most of the CONUS day and night. The reality is 
> the system would be best placed on PEP as well as strategic secondary 
> stations since they have the hardened infrastructure already in place.
megasnip...

In support of VLF being a viable alternate national EAS backbone, I'd 
note that WWVB operates at just 10 kW from the outskirts of Ft.. 
Collins, CO., on 60 kHz.

With more power - and/or a better antenna system - full coverage of most 
of the Western Hemisphere would be possible, let alone CONUS...

http://www.nist.gov/pml/div688/grp40/wwvb.cfm

Maps:

http://www.nist.gov/pml/div688/grp40/vb-coverage.cfm

The worst-case for the 10 kW transmissions seem to be about 1400 UTC, 
when the signal reaches from the Rockies to the Appalachians... at 06:00 
UTC, the predicted coverage reaches from Africa to Hawaii....and well 
into most of South America; but for some reason doesn't make it into 
Alaska at all...

-- 
Tom Spencer