| 摘要 |
<p>PURPOSE:To make possible to control gain of receiving circuit automatically and to obtain stabilized receiving output with delay of a cicle by utilizing the memory circuit. CONSTITUTION:Relative judgement section 9 monitors output signal A of a detection circuit 7, and check if gain of HF A4 and IF A6 is suitable for receiving signal sent from an antenna 1 or not. In case it is judge unsuitable, require signal of gain correction information change is given. By this signal, a control section 10 changes gain correction information inside a memory section 11 and reads out the gain correction information synchronizing with bearing and distance. Then, the section transmits the correction signal E to a mixing section 13. The mixing section 13 forms gain control signal G by mixing the correction signal E and receiving gain control signal F and feeds to HF A4 and IF A6. Therefore, the optimum gain against the input signal can be obtained.</p> |
