| 摘要 |
PURPOSE:To make the holder with a metallic material without incurring the deterioration in the reception performance. CONSTITUTION:A metal-made holder 2 containing removably a receiver with an antenna incorporated therein is provided with an external antenna 7 fixed to a proper position of an outer face via an insulation layer. Moreover, the receiver is provided with a built-in antenna 5, a reception circuit 4, an external and internal antenna matching circuit, a matching circuit 6 matching the reception circuit 4, and a switch SW 1 switching an input terminal of the matching circuit 6 to each output terminal of the built-in antenna 5 and the external antenna 7. When the receiver is contained in the metal-made holder 2, the external antenna 7 is provided with a contact piece inserted through a reception hole provided to the receiver case into the case to throw the switch SW 1 to the position of the external antenna 7. |
