FILTER AUTOMATIC TUNING SYSTEM

摘要

PURPOSE: A filter automatic tuning system is provided to tune a frequency to a new transmitting frequency appointed automatically. CONSTITUTION: A filter automatic tuning system includes a filter(11) reflecting a few elements of radio frequency(RF) input signals which is not turned to the filter(11). An RF signal detecting section(12) generates a predetermined direct current(DC) power responding the reflected RF signals. A controlling module(13) determines whether the RF input signals are tuned to the filter(11) by the predetermined DC power. In the negative, the controlling module(13) generates a predetermined control signal to a tune adjusting device controller(14) of the filter(11), so as to tune the filter(11) to the RF input signals. The tune adjusting device controller(14) controls a tune adjusting device(15) by the predetermined control signal.