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3. Decoding of Messages
The FMD can receive, decode and reproduce messages in
legible characters, when transmitted in Morse, RTTY and SITOR-
NEC codes. Apart from these codes there are many other
code types used in radio communication which are ciphered.
These types of messages are not for the general public and
can therefore not be decoded by the FMD55.
Weather, SAR and navigational warnings for shipping are
transmitted in codes, which the FMD55 can decipher.
The reception signal (LF) is fed to the signal processor where the
usable signal tone is filtered out and converted into digital
information.
The mode of the type of code transmitted by a station, can be
found in corresponding maritime radio manuals. Various
abbreviations are used:
xfor MORSE : CW, A1, A1A, telegraphy
xfor RTTY : F1B, radio teletype,
xfor SITOR : FEC, ARQ, F1B
Before a signal can be decoded, it must be reasonably free of
interference, (i.e. with the least possible noise ratio, no clicking
or crackling, no other disturbing stations in the receiving range).
In the top two lines of the LCD display, a signal spectrum is
depicted to assist in the adjustment.
Morse signals consist of only one tone. By reception of an
undisturbed MORSE signal, the following picture appears on the
display
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