| 摘要 |
<p>PURPOSE:To prevent the superimposing transmission of a pilot signal by sending the pilot signal instead of a main station only when the main station really stops the transmission of the pilot signal. CONSTITUTION:A transmitting signal (expect pilot signals) at the level from the main station is detected by a receiver 6 or 8. and the pilot signal is detected by a receiver 5. When the level of the pilot signal deteriorates, the pilot signal from a pilot signal generator 14 is sent for the first time when the detection signal by the receiver 6 or 8 is at the prescribed level.</p> |
