Patent ID: 6898152

Claim:
A radio controlled clock comprising: a main unit; and at least two separate antenna modules selectively connectable to the main unit for co-operation with the main unit, the main unit comprising a main body, a liquid crystal display (LCD) and a plurality of keys on the main body, a main operating circuit housed within the main body, and a plurality of main unit electrical contacts supported by the main body; the main operating circuit comprising a CPU control unit connected to the LCD for displaying time and to the keys for control, and at least two decoders connected to the CPU control unit for decoding radio frequency time signals having different carrier frequencies and received by respective antenna modules, the decoders being connected to the main unit contacts; each of the antenna modules comprising a module body releasably connectable to the main body of the main unit, a module operating circuit housed within the module body, and a plurality of module electrical contacts supported by the module body for connection to the contacts of the main unit when the antenna module is connected to the main unit; and the module operating circuitry comprising a receiver tuned to receive a radio frequency time signal of a specific carrier frequency broadcast in a particular country or region and to send the signal received, via the main unit and module contacts, to the respective decoder of the main unit for enabling the CPU control unit to display local time on the LCD according to the signal received.