Direction adjustment indicator for a satellite radio wave receiving antenna.

摘要

A direction adjustment indicator (17) for a satellite radio wave receiving antenna comprises a demodulating circuit (20) to demodulate a satellite radio wave received by the antenna, a peak holding circuit (21) always to output a held peak value of the demodulated output of the demodulating circuit, a comparator circuit (22) and a display element (23). The comparator circuit (22) compares the instantaneous value of the demodulated output and the held peak value, and outputs a signal when both values are equal and another different signal when both values are not equal. The display element (23) gives two different kinds of display in accordance with the signals. While the azimuth angle of the antenna is varied in one direction, a peak value of the demodulated output is held and while the angle is varied in the opposite direction, the optimum azimuth angle is displayed for which the instantaneous value of the demodulated output agrees with the held peak value. <IMAGE>