| 摘要 |
PURPOSE:To enable the selection to optimum antenna, by monitoring the signal level of antenna in use out of two antennas. CONSTITUTION:When the switches 15a, 25 are ON, switches 15b, 26 are OFF and the signal level of the antenna 12 decreases to the threshold, then the level detector 24 produces an output and the search pulse generator 27 gives pulses to the signal generator 15c and comparator 29. Thus, the antenna is selected to the antenna 13 for a given time, the comparator 29 compares the level immediately before the selection and that after the selection to feed pulses to select the antenna having greater level to the pulse signal generator 15c. Thus, reception is made by the selection to the best antenna. |
