3.4.
Message Memory
The FMD15 possesses two separate independent memory
stores. One for NAVTEX messages (see chap.5) and one for
Morse, RTTY and SITOR messages.
The latter has a capacity of about 15000 characters. A
message of maximum 3750 characters can be stored in a
data record. Should a message be longer, further data
records will be automatically opened. All in all, 100 data
records can be filed with a total capacity of 15.000
characters. Should the memory store be full, a new message
will be stored by replacing the oldest messages.
The most up-to-date messages will always be available.
It can happen that a new message of only a few characters
replaces the oldest message containing 3750 characters. At
this moment the store contents have been reduced to 11250
characters.
On completion of the message, every data record will be
stored with a identification in form of date and time
(TTMMhhmm).
Should the FMD15 be switched off during storage, whether
deliberately or not (e.g. power interruption), the actual data
record will not be stored because of lack of signal ending.
Because of strong disturbance (e.g. starting the motors with
weak batteries), it can happen that the identification of data
records may be partly or completely deleted. In this case, it
may be possible to read messages only partly or not at all. On
restarting the unit it can happen that all messages in the
memory are deleted for safety reasons, because the unit
cannot recognise the identifications.
Thereafter newly decoded messages will be stored correctly.
