Raytheon TRP 1150 Operation Manual page 19

Key in the nine digit MMSI number of the wanted ship.
A working channel shall be proposed when calling another ship.
Normally 2177 kHz is used for intership DSC calls. In addition user programmed DSC
frequencies may be selected. If DSC frequencies were selected from the Telephony display
prior to the call these are default. Distress frequencies cannot be selected in any way.
Transmission of a DSC call on MF/HF takes approx. 8 seconds. The called ship is supposed
to answer the call by sending a DSC Acknowledgement within 4½ minutes. When acknowl-
edgement is received lift the handset and mode and working frequencies will be set as
indicated in the acknowledgement.
If no acknowledgement is received within 5 minutes, the equipment returns to the previous
telephony display and starts scanning if selected.
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Insert the number in the call
Selects a submenu where a prepro-
grammed ship station can be selected
Backspace, deletes last figure
Insert the working frequencies in the call
Selects telephony display for change of
working frequencies
Select the DSC frequency
Steps between DSC frequencies
Starts transmission of the call
Displays the contents of the acknowledge-
ment
Sets mode and frequency as indicated in
the acknowledgement
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