Personal communication device with transmitted RF power strength indicator

A radio communication system for communication between a first mobile system and a second mobile system, each of the first and the second mobile systems having a transceiver for receiving and emitting radio signals, the second mobile system comprising:

• a received signal strength detecting device for detecting a received signal strength of the transceiver in the second mobile system, wherein the received signal strength is represented as voltage;
• a power controller for outputting a transmitted power strength status comprising:
• a V-I converter which is a transistor array comprising P-type MOS transistors, wherein the gates of the P-type MOS transistors are controlled by the received signal strength, the V-I converter generates a supply current to power a transmitter of the transceiver in the second mobile system corresponding to the received signal strength to control a transmitted power of the transceiver in the second mobile system;
• a transmitted power calibration device with switches, wherein each switch is connected in series with a corresponding P-type MOS transistor in the V-I converter to decide whether current is allowed to flow through the corresponding P-type MOS transistor;
• and
• an indicating device for receiving the transmitted power strength status and indicating a transmitted RF power strength status of the transceiver in the second mobile system.