TRANSMISSION CONTROLLING DEVICE

摘要

PURPOSE:To uniform transmission power regardless of variance in a transmission range between equipments caused contactlessly by providing a means controlling automatically power output based on the signal intensity of a received information signal by an active module. CONSTITUTION:The power transmission section of the active module A uses an RF power amplifier 3 to apply power amplification to the output of an oscillation circuit 1 oscillating a power sending frequency via an RF (high frequency) buffer amplifier 2 and uses an electromagnetic sending head 4 to radiate its electromagnetic wave. The FM wave thus radiated is caught by the electromagnetic wave reception head 12 of the active module A. In this case, a part of the output of the RM amplifier 13 is detected and rectified by a carrier detection circuit 16 and fed to the control terminal of a voltage control circuit 19 inserted in series with the power supply of the RF buffer amplifier 2 and the RF power amplifier 3 via a proper time constant circuit 17 and a gain adjustment variable resistor 18. Thus, the power sending output is controlled automatically.