| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem where a VHF broadcast signal is mixed with a down-converted L-Band broadcast signal as a disturbing signal, when receiving the L-Band. SOLUTION: This receiver has a VHF system 20 for receiving a VHF broadcast signal from a DAB broadcast signal and an L-Band system 30 for receiving the down-converted L-Band broadcast signal by down-converting the L-Band broadcast signal to a VHF band from the DAB broadcast signal by a mixer 37 for down-conversion, and the VHF system has a PIN diode 21 for suppressing the input level of the DAB broadcast signal, 1st and 2nd tuning circuits 23 and 25 for tuning in to the VHF broadcast signal from the DAB broadcast signal on the basis of a tuning voltage, an ATT control circuit 27 for turning off a diode 21, when receiving the L-Band and a microcomputer 50 for controlling the tuning voltage, so that the tuning frequency of the VHF broadcast signal tuned in by the 1st and 2nd tuning circuits do not disturb the received frequency of the down-converted L-Band broadcast signal.
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