| 摘要 |
PURPOSE:To attain communication without interruption by the other party by providing a pseudo signal in addition to a signal to be modulated in the FH system. CONSTITUTION:The signal to be modulated is modulated and amplified by a radio modulation circuit 5 and mixed with a frequency of a frequency synthesizer 10 by a mixer circuit 6 according to the spread code of a spread code generating circuit 9, amplified by a power amplifier circuit 7 and sent through a synthesizer 8 to obtain spectrums 31-3N. On the other hand, the pseudo signal generated by 1 pseudo signal circuit 12 is synchronized with a frequency synthesizer 10 by an offset circuit 11, mixed with the mixing circuit 12, amplified by the power amplifier 14 and sent through the synthesizer 8 to obtain spectrums 41-4N. Thus, the AGC circuit of an interception receiver is activated to lower the reception signal level of hopping patterns 31-3N thereby avoiding the interception of the signal to be modulated. |
