A radio controlled clock includes a main unit and interchangeable antenna modules.
The main unit includes an operating circuit and contacts. The circuit has a CPU
and decoders for decoding RF time signals having different carrier frequencies
received by the modules. The decoders are connected to the contacts. Each module
has a body connectable to main unit body, an operating circuit, and contacts connectable
to the contacts of the main unit when a module is connected to the main unit. The
circuit of the main body includes a receiver tuned to receive a RF time signal
having a specific carrier frequency broadcast in a particular country and sends
the signal received, via the contacts to a decoder, enabling the CPU to display
the local time on a display.
