| 摘要 |
<p>PURPOSE: To allow a receiver to be made compact and shorten the test adjustment period by using a capacitance variable capacitor as a circuit constituting part. CONSTITUTION: A central frequency variable BPF 34 for intermediate frequency band on delta-ch side is a parallel resonant capacitance combination BPF, and a capacitance variable capacitor is used for a capacitor in the circuit constituting element. Since the phase shifting amount of the BPF 34 can be changed by varying the capacitance of a capacitor in the BPF 34, the relative phase balance between sigma-ch and delta-ch can be adjusted. The data on the changing amount of the phase shifting amount is set in a control circuit 39 for central frequency variable BPFs and the phase shifting amount of the BPF 34 is changed only be the set amount so as to adjust a radar receiver. Thus, by preparing the BPF 34 and control circuit 39, the change in angle error voltage can be suppressed and more devices are unnecessitated than heretofore, so that a receiver can be made compact.</p> |
