| 摘要 |
PURPOSE: To prevent deterioration in communication efficiency and to improve the system convenience by allocating a different hopping pattern to a frequency switched for each prescribed time so as to conduct radio communication with the allocated hopping pattern. CONSTITUTION: Data received from an external circuit are subject to band limit by a base band filter 626 in a radio section and given to a modulation terminal of a VCO 622 of a transmission system. A modulation wave of an intermediate frequency generated by a frequency synthesizer consisting of a VCO 622, an LPF 623 and a PLL 624 is given to an up-converter 608 and added to a carrier signal generated by a frequency synthesizer consisting of a VCO 619, an LPF 620 and a PLL 621 for hopping and the sum is given to a transmission system amplifier 606. The signal amplified by the transmission system amplifier 606 in the case of transmission is subject to elimination of an undesired band signal by a BPF 603 and the resulting signal is emitted to space as a radio wave from antennas 601a, b. |
