Ask (Amplitude Shift Keying) - Furuno Felcom 250 Service Manual

4. ASK (Amplitude shift keying)

Communication (Simplex communication) between the Antenna unit and the
Communication unit is executed using ASK signals. The actual communication is executed
by the ATB Module of the Antenna unit and the MODEM board of the Communication
unit.
ASK signals transmit digital data by switching between ON/OFF for the 4 MHz carrier
signal.
The specifications for the ASK interface
Communication speed :
Data length
Parity
Stop bit
Flow control
Frequency
38400 bps
: 8 bit
: Non
: 1 bit
: N/A
: 4 MHz
11-5
11.1 Communication unit: FB-2000