JMC NT–2000 - Second Receiver Selection and Display Specs; Text Display, Message Handling, and Storage; Message Storage Capacity and Protection

NT-2000 REF Manual
Specifications
9-2
9. Specifications ( continued – 2/4 )
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10) Second Receiver Selection: 490 kHz or 4209.5 kHz selectable via menu system
(
11) Source of Time: Derived from CPU clock 24.00 MHz for calculation of
time passage to handle message aging. No real time
clock (RTC) is used.
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12) Display Screen: 8–inch color VGA TFT LCD, daylight–viewing, backlit
Text display resolution: QVGA
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13) User Interface Language: English (menus, status, prompts, cautions)
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14) Text Display:
･ NAVTEX Messages : 40 characters per line, 18 lines per screen. A forced
carriage return symbol
*
(

) divides the last word at
40th character position if the number of character in
a line exceeds 40.
*
Hex 5F ( _ ) is output to printer or INS.
･ Statuses & Prompts: 1 line (40 characters maximum) at screen’s upper
and lower edges
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15) Indication of Message Reception and Storage
･ Message Reception: Tag iNEW MESSAGEi is attached to message ID.
･ Storage: Indication “STORED” is turned on at the end of each
satisfactorily received message together with a
character error rate (CER= XX%) readout
(
16) Message Scrolling:
･ Live Messages: Automatic, line–by–line scrolling
･ Stored Messages: Manual, line–by–line or page–by–page scrolling
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17) Message Storage:
･ Capacity: 200 messages (average 500 characters per message) for
each of 518 kHz, 490 kHz and 4209.5 kHz receivers.
Up to an additional 50 messages can be stored on
each frequency if stored messages are protected.
If the equipment receives a message with a character
error rate (CER) of > 4% and ≦ 33%, it will store
the message but receive the same message to be
transmitted subsequently. If the subsequent message
has a lower CER, it will automatically replace the
previously stored message. If a message is received
with a CER > 33%, it will not be stored.
･ Duration: 60 hours from successful reception of each message,
after which old messages will be automatically
erased from memory on a first–in–first–out basis
except for user–protected messages that cannot be
erased from memory until their protection tags are
removed manually. Time source is derived from CPU
clock (24.00 MHz) to compute message aging.
・Storage４ without Power: Protected messages are stored for at least 10 days
after power is removed continuously.
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continued on next page )