4. OPERATION ............................................................................................. 4-1
4.1 Operation overview .................................................................................................... 4-1
4.1.1 Operation of the controller ..................................................................................... 4-1
4.1.2 Operation of the data terminal ............................................................................. 4-3
4.2 Basic communications procedure .............................................................................. 4-5
4.2.1 Turning on the power ........................................................................................... 4-5
4.2.2 Turning off the power/ Putting into sleep mode ................................................... 4-6
4.2.3 Communicating in radiotelephone mode ............................................................. 4-7
4.2.4 Communicating in CW mode ............................................................................... 4-9
4.2.5 Receiving AM broadcasts .................................................................................... 4-11
4.2.6 Communicating in telex mode (TLX) ................................................................... 4-12
4.2.6.1 ARQ mode operation .................................................................................... 4-12
4.2.6.2 CFEC mode operation .................................................................................. 4-15
4.2.6.3 SFEC mode operation .................................................................................. 4-19
4.2.6.4 Editing telex messages ................................................................................ 4-21
4.3 Setting the radio ......................................................................................................... 4-24
4.3.1 Setting the communication frequencies ............................................................... 4-24
4.3.2 Setting the communication channels ................................................................... 4-25
4.3.3 Setting the automatic gain control (AGC) ............................................................ 4-29
4.3.4 Setting the noise reduction (NR) .......................................................................... 4-29
4.3.5 Setting the attenuation (ATT) ............................................................................... 4-30
4.3.6 Setting the clarifier ............................................................................................... 4-30
4.3.7 Setting the squelch level ...................................................................................... 4-31
4.3.8 Setting the CW bandwidth ................................................................................... 4-31
4.3.9 Scanning the Rx frequencies ............................................................................... 4-32
4.3.10 Reducing the Tx power ........................................................................................ 4-34
4.3.11 Setting the antenna tuning power ........................................................................ 4-34
4.4 Basic DSC operations ................................................................................................. 4-35
4.4.1 Routine calls to an individual station .................................................................... 4-35
4.4.2 Routine calls to a group of ships .......................................................................... 4-38
4.4.3 Receiving routine calls ......................................................................................... 4-40
4.5 Emergency calls (DSC safety/urgency/distress calls) ................................................. 4-44
4.5.1 Safety calls ........................................................................................................... 4-44
4.5.1.1 Individual calls .............................................................................................. 4-44
4.5.1.2 Area calls ...................................................................................................... 4-46
4.5.1.3 Other features of the safety calls (position request/test) ............................... 4-48
4.5.1.4 Receiving safety calls ................................................................................... 4-52
4.5.2 Urgency calls ....................................................................................................... 4-55
4.5.2.1 Individual calls .............................................................................................. 4-55
4.5.2.2 Area calls ...................................................................................................... 4-56
4.5.2.3 Special calls (medical transport/neutral ship) ............................................... 4-58
4.5.2.4 Receiving urgency calls ................................................................................ 4-58
4.5.3 Distress calls ........................................................................................................ 4-60
4.5.3.1 Quick distress calls ....................................................................................... 4-60