[time-nuts] Odd HP 117A configuration

[christopher hoover]

Brooke Clarke <brooke at pacific.net> wrote:
> The same company has another program
> that decodes the Northern California DX beacons
> (as controls the receiver frequency).  Note the 
> beacons transmit in GPS controlled time slots
> with stepping RF power levels.

The whha...at beacons?   Is there a web page
Where I can learn more?

-ch