SWITCHING CIRCUIT BETWEEN OUTPUT SECTIONS OF ACTIVE AND STANDBY TRANSMITTERS

PURPOSE:To shorten switching time and to attain circuit integration for the title circuit by employing a diode and a switching transistor(TR) being semiconductor components so as to change over an output section of an active transmitter to an output section of a standby transmitter. CONSTITUTION:A control signal turning on a switching TRSW of the output section 1 of the active transmitter is applied and a control signal turning off a switching TRSW of the output section 2 of the standby transmitter is applied, a signal from the output section 1 of the active transmitter is sent to an opposite equipment. Moreover, when a control signal turning off a switching TRSW of the output section 1 of the active transmitter is applied and a control signal turning on a switching TRSW of the output section 2 of the standby transmitter is applied, a signal from the output section 2 of the standby transmitter is sent to an opposite equipment. Thus, the output section 1 of the active transmitter and the output section 2 of the standby transmitter are switched. The changeover is applied by employing diodes D1, D2 and switching TRs TRSW. Thus, circuit integration in attained and the switching time is shortened.