| 摘要 |
PURPOSE:To attain the internal calling among slave devices with no radio fault, etc. for a radio telephone set which can perform communication even among slave devices, by carrying out calling among slave devices after an indication of a master device is received. CONSTITUTION:When the 1st slave device desires an internal call with the 2nd slave device, a transmission switch of the 1st slave device is first turned on. Thus a carrier signal of a prescribed frequency is transmitted from a transmission circuit 37. For a master device 1, a monitor reception circuit 4 is scanned successively. When the frequency of said carrier signal is coincident with the frequency of the carrier signal of the 2nd slave device, the signal sent from the 2nd slave device is amplified by the circuit 3. Then the carrier signals and information signals P1 and P2 are detected by the 1st-3rd detection circuits 9-11 respectively and applied to the control circuit 3. When the circuit 3 confirms that the 2nd slave device is put under a waiting state, a permission signal is delivered from a code signal oscillator 13 by a command of the circuit 3. |
