| 摘要 |
PROBLEM TO BE SOLVED: To provide satisfactory amplification efficiency or to suppress generation/amplification of unwanted higher harmonic waves (especially of secondary higher harmonic waves), for reducing power consumption, and moreover to deal with frequency hopping. SOLUTION: By locating band-pass filters B1, D1, B2, D2, B3 and D3, although power amplifiers C1, C2 and C3 are respectively configured as narrow-band power amplifiers 1, 2 and 3, as to which one of power amplifiers C1, C2 and C3 is to amplify a VHF band signal, the gain in each of power amplifiers C1, C2 and C3 is controlled by a bias voltage controller F, so that only the power amplifier corresponding to a transmitter output frequency can be set in an amplified operating state.
|
