| 摘要 |
PROBLEM TO BE SOLVED: To provide a high coupling degree to both frequencies of the communication of an FSK system without the need of special changeover. SOLUTION: This interrogator 10 transmits signals by FSK modulation. A first tuning circuit 17 constituted of an antenna coil L1 and a tuning capacitor C1 and a second tuning circuit 18 constituted of a coil L2 and the tuning capacitor C2 are connected by an adjustment capacitor C3 and a 2-wave tuning circuit adjusted so as to bring a tuning peak in either one of the two frequencies of FSK is formed. Thus, FSK signals are efficiently transmitted without the special changeover. |
