| 摘要 |
a NPN transistor(TR1) where a voltage, which filtered RX phase difference pulse, is applied to its base; a dual gate circuit unit(101) where the collector voltage of TR1 is applied to one of its gate, and a MPU applied TX data signal is applied to it's another gate; a varicap diode(VD5) for biasing a dual gate output; varicap diodes(VD6, VD7) which is biased with a voltage of a TX phase detector in a PLL IC; a voltage controlled oscillating unit(102) having an inductor for determining a resonance frequency, capacitors(C55,C56,C57) for oscillating, and a transistor(TR2); thereby keeping a constant level of modulation input in a wide frequency range.
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