| 摘要 |
PURPOSE:To make centralized supervision of error information in an intermediate frequency signal possible and to control the frequency from an external equipment by receiving AFC data synchronized with the frequency of a pilot signal from the external equipment. CONSTITUTION:A mixer 1 converts plural reception signals into an intermediate frequency signal 11, a distributer circuit 2 distributes the signal 11 into an AFC 4. The AFC 4 gives an AC signal 14 synchronously with the frequency of the pilot signal 13 included in an output signal branched by the circuit 2 and relating to the deviation of the pilot signal 13 from a desired frequency to a frequency counter 6. The counter 6 gives counting information representing deviation from the desired frequency to a control circuit 7. The circuit 7 adjusts the controlled value to correct the frequency of an oscillating signal from a VCO 3. The oscillating signal 17 from the VCO 3 is inputted again to the frequency counter 6 by a branching circuit 5 to discriminate whether or not the change in the frequency is settled within the object signal of the control circuit 7 and the oscillating signal 18 is given to the mixer 1, by which the intermediate frequency is corrected. |
