3.8. Memory Storage
The FMD55 has two separate and independent memory stores
for decoded messages. One is for NAVTEX messages (see
Chapter 5.) and the other is for MORSE; RTTY and SITOR. The
latter has a total capacity of 14000 characters. A message of
maximum 3600 characters can be stored in one data record.
Should the message be longer, then additional records will be
opened. Altogether 100 record with a total capacity of 14000
characters can be set up. When the memory storage is full
while storing, the oldest record will be deleted to make space
for the new one. This means that the latest or most up to date
message will be stored independent of the type of code
(MORSE, RTTY, SITOR). It can happen that a message containing
only a few characters deletes a complete record of 3600
characters thus reducing the capacity to 10400 characters.
Each data record is filed under date and time when the
message ended plus one minute, in the formation:
DDMMhhmm. Further, the data record contains the channel
source and arranges itself under this channel for recalling.
Should the FMD55 be switched off, deliberately or not (e.g.
interruption of supply), then the data record being currently
stored will be deleted because of the incomplete closure.
It can happen that because of heavy disturbance in the power
supply (e.g. engine start with low batteries), the recognition of
the data records has been destroyed or partly destroyed so
that the stored message can only be partly read out or
eventually not at all. When switched on again the unit may not
recognise the record and delete it. Newly decoded messages
will in any case be correctly stored.
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