Piccolo was the original MFSK mode, developed for British government communications by Harold Robins, Donald Bailey and Denis Ralphs of the Diplomatic Wireless Service (DWS), a branch of the Foreign and Commonwealth Office.
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They can be also used for broadcasting but they require a higher level of available C/N and an adoption of advanced pre-distortion methods in the uplink station in order to minimize the effect of transponder non-linearity.
The German time signal DCF77, in addition to amplitude keying, employs phase-shift keying driven by a 9-stage LFSR to increase the accuracy of received time and the robustness of the data stream in the presence of noise.
It was at one time only compatible with ADSI-compliant telephones but is now compatible with any customer premises equipment (CPE) that simply responds visually to visual FSK.