| 摘要 |
PURPOSE:To exchange voice data while giving a deviation value from the center of the reception frequency learned by a 1st means by providing a 1st means performing the broadband frequency sweep for the reception frequency and a 2nd means performing the sweep of the narrower while taking a reception frequency deviation value as the center of the sweep. CONSTITUTION:When the transmission frequency is changed by frequency setting devices 1 and 2, transmission pattern changeover circuits 3, 4 transmit an initial pattern A. The reception side detects an initial pattern A from the reception data. When normally detected, the initial pattern to be transmitted is changed from A to B, and the modes of demodulators 9, 10 are changed to a burst mode. At the automatic frequency control of the opposite station, the burst with the length two or three times the required sweep time is taken at the data transmission. When either one of the station receives an initial pattern B, the communication of the voice data is performed. |
