| 摘要 |
PURPOSE:To receive a selected band with an antenna without being subjected to disturbance of signals other than the signal of the selected receiving band by inserting a filter between an antenna input terminal and an antenna tuning circuit in receiving a receiving band. CONSTITUTION:When a switch 11 is changed over to receive a medium wave, a switch 15 is changed over to the medium wave position. Then, a medium wave signal received on a rod antenna 1 is inputted to an antenna tuning circuit 4 through a filter 16. If a strong signal of short wave, etc. is incoming to the antenna 1, the signal is blocked by the filter 16. Thus, a weak medium wave signal is received in an excellent way by using an antenna. In receiving a short wave, the switches 11, 15 are changed over to the short wave side, and an antenna input terminal 3 is connected directly to an antenna coil 6 of an antenna tuning coil 14. Thus, a weak signal of short wave is received without being subjected to the insertion loss of the filter 16. |
