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5 CALLING, RECEIVING
5-8
12. Press the [CALL] key to send the individual call (transmission time: about seven
seconds). The display shows the message "Individual request call in progress!" while
the call is being sent.
Individual request
call in progress!
TIME TO GO: 7S
TO SHIP:
123456789
DSC FREQ :
2177.0 KHZ
ROUTINE
TELEPHONE 2138.0 KHZ
Note: When the channel is in use,
"CH BUSY" appears at the
lower left-hand side of the
screen.
Press [CALL] key for forced
transmission.
13. After the call is sent, the equipment waits for acknowledgement of the call, showing the
display below.
Waiting for
acknowledgement.
TIME TO GO: 4M30S
FROM SHIP:
123456789
DSC FREQ :
2177.0 KHZ
ROUTINE
TELEPHONE 2138.0 KHZ
14. The timer starts counting down the maximum time to wait for acknowledgement, five
minutes, randomly set. One of the following three messages appears. (“No response!
Try calling again.” appears after the timer counts down to zero. It means the receiving
station did not respond.)
No response!
Try calling again?
FROM SHIP: 123456789
ROUTINE
TELEPHONE 2138.0 KHZ
DSC FREQ :
2177.0 KHZ
CALL AGAIN
Able acknowledge
call received.
FROM SHIP: 123456789
ROUTINE
TELEPHONE 2138.0 KHZ
STOP ALARM
Unable acknowledge
call received.
STOP ALARM
FROM SHIP:
123456789
ROUTINE
NO REASON GIVEN
Able acknowledge call received Unable acknowledge call received No response from station
15. Do one of the following depending on the message shown in step 14.