| 摘要 |
PROBLEM TO BE SOLVED: To satisfy miniaturization and low cost at the same time by reducing transmission spurious radiation from a two-way radio communication equipment and improving the reception sensitivity. SOLUTION: The equipment is provided with a band pass filter 11, a low noise amplifier connected between the filter 11 and an input terminal 51 of an orthogonal demodulator 14, an attenuator 19 connected between the filter 11 and an output terminal 54 of an orthogonal modulator 17, a PLL oscillator 18 whose output terminal connects to an oscillation input terminal 52 of the orthogonal demodulator 17 and connecting to an oscillation input terminal 53 of the orthogonal demodulator 17, a 1st low pass filter 15 connected between a base band output terminal 56 of the orthogonal demodulator 14 and a base band input terminal of a signal processor 30, a 2nd low pass filter 16 connected between a base band input terminal 55 of the orthogonal demodulator 17 and a base band output terminal of the signal processor 30, and a data output terminal 21 and a data input terminal 20 connecting to the signal processor 30. |
