PORTABLE RADIO DATA TRANSMITTER

PURPOSE:To perform the control so that the output of data is started when a fixed period of time passed after a power supply is applied to a transmission circuit, then, this application of power is stopped after a fixed period of time, by applying power to a control circuit at all times and also to the transmission circuit by a switching operation via the control circuit. CONSTITUTION:A power supply control circuit 18 controls the application of the power supply of a transmission circuit 2 and consists of T type flip-flop circuits F10-F15 and F17, a D type flip-flop circuits F16, AND circuits AND1-3, inverter circuits INV5-8 and a buffer circuit BUF1. A data control circuit 14 controls the timing of the data supplied to the circuit 2 and consists of T type flip-flop circuits F18-20, F22-25 and F27, D type flip-flop circuits F21 and F26, AND circuits AND4-9 and inverter circuits INV9-14. A parallel/ serial circuit 16 is connected to a memory circuit 15. Then an FS modulation circuit 17 applies top FS modulation to the output data of the circuit 16.