| 摘要 |
<p>PURPOSE:To improve the receiving sensitivity of a receiver to a transmitter by providing an antenna member connected to a receiver, the plug of which is rotatable to a jack and freely rotating a receiving coil of a receiving circuit in an antenna member to the receiver. CONSTITUTION:A receiver 2 has a jack 7 on one side through an opening and an external antenna member 9 having a plug 8 rotatably connected thereto is installed on the jack 7. An external antenna member 9 is constructed so that a receiving coil 15 formed by winding a coil 14 round an inner core 13 is fixed by clamping both ends of the core 13 by coil fixing ribs 16, and is positioned and stored in such a manner that a resonance condenser 18 connected to a plug 8 at one end portion by a feed lead wire is connected to the coil 15. A transmitter is installed on the breast of a tested person, a power switch 10 of the receiver 2 is turned on, the external antenna member 9 is rotated to the receiver 2 and the receiving sensitivity is adjusted to the maximum value.</p> |
