| 摘要 |
An automatic direction finder capable of measuring a direction with a higher accuracy is disclosed. In an initial measurement, loop antennas and a vertical antenna are used in a conventional manner. However, in a final measurement the vertical antenna adversely affected by the surrounding disturbances is not employed and only the loop antennas are used. The disclosed finder includes a switching device for disconnecting the vertical antenna in the final measurement. The finder is also provided with a pair of search coils disposed perpendicular to each other. One of the search coils is connected to a combining circuit via the switching device, while the other is connected to the combining circuit via a balanced modulator.
|
