Time-keeping radio display pager precisely calibrated to local standard

Abstract

A radio display pager receives a series of frames from a paging station synchronized to the seconds of the local standard time. Each frame contains a frame synchronizing signal and a frame position signal indicating the position of the frame within the series, each of the frames being synchronized with a local standard time of the paging station. A frame counter increments a count value in synchronism with the reception of each frame synchronizing signal and produces an output when the count value reaches a predetermined value. The frame counter is reset to an initial value in response to the reception of a predetermined frame position signal which occurs at 1-minute intervals. A time-keeping circuit counts locally generated clock pulses to display the time of day on a display unit. The time-keeping circuit is responsive to the output of the frame counter for calibrating the time of day to the local standard time.