| 摘要 |
<p>PURPOSE:To control the gain of an intermediate frequency amplifier even for the quickness of the level variation of an incoming desired wave to occur because free space attenuation quantity changes accompanying the change of hopping frequency. CONSTITUTION:Desired carrier frequency data fRD outputted from a PN generator 62 is inputted to a hopping frequency ratio generator 91, and the ratio of the hopping frequency ft of a corresponding time slot (t) to the hopping frequency ft-1 of the time slot t-1 preceding by one time slot, that is, a hopping frequency ratio value ft/ft-1 is outputted from the hopping frequency ratio generator 91. The hopping frequency ratio value ft/ft-1 is logarithm-transformed by a logarithmic transformer 921, and is added to a switch 924 after its polarity is inverted by in inverting amplifier 923. The switch 924 adds the output of the inverting amplifier 923 to an automatic gain control amplifier 93 by a compensation bias impression timing pulse TPCB from a timing signal generation circuit 61.</p> |
