| 摘要 |
The output voltage level variation of an automatic gain controller of a tuner is checked by a microcomputer periodically to detect antenna direction deviation. The circuit includes an AGC/ AFT input selection switch unit (6) for selecting AGC or AFT signal transmitted from a microcomputer (4), a microcomputer (4) for outputting switching control signal to detect AGC voltage level and for driving a display (7) according to detected AGC voltage level and a display (7) for driving a LED periodically by driving signal transmitted from a microcomputer to display the deviation of an antenna. |
