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Transmitting Character Strings from the RTTY
Message Memory
A message that is registered in the RTTY message memory can
be transmitted as follows.
1 Press F5 [MEMORY] to display the RTTY Message
screen.
.
2 Press F3 [CH 1] to F6 [CH 4] or F3 [CH 5] to F6 [CH
8] to select the channel that contains the message
to be transmitted.
The RTTY message of the channel corresponding to the
function key is being transmitted automatically.
If the channel guide is not displayed, press F2 [MORE].
Pressing F7 [NEXT] each time switches between F3 [CH
1] to F6 [CH 4] and F3 [CH 5] to F6 [CH 8].
After transmitting the RTTY message that is indicated by an
<<
>> display beside it, this transceiver returns
to the RX mode.
Settings Related to RTTY Encode/Decode
Enabling Decode UOS (Unshift on Space)
If a space character is included in the RTTY signal that is received,
the character following the space can be forcibly interpreted as a
character code (alphabet).
In RTTY, garbled characters may appear due to the signal strength
or noise. To avoid this from happening as much as possible, the
character after a space character is interpreted as a more
frequently used character code (alphabet).
Configure in Menu [2-01]
RX UOS
Setting Value Off/ On (default)
On: Encodes space characters.
Off: Does not encode space characters.
To receive a numeric value or symbol that immediately
follows a space character, turn off the UOS function.
Newline Code Setting
Configure the newline code when receiving an RTTY signal.
Configure in Menu [2-02]
Newline Code
Setting Value CR+LF/ All (default)
All: Inserts a line break for every newline code.
CR+LF: Inserts a line break only when a CR+LF code is
received.
Diddle Operation
Diddle allows the user to select the type of code to transmit when
the characters to be sent run out during transmission in the RTTY
(FSK) mode.
Configure in Menu [2-03] Diddle
Setting Value Off/ Blank Code (default)/ Letters Code
Off: Does not send out a character code.
Blank Code: Sends out a space character.
Letters Code: Sends out a character code.
Encode UOS
This is used for sending out a numeric value or symbol that
immediately follows a space during transmission in the RTTY
(FSK) mode. Enabling this function allows the receiving station to
recognize the code that comes after a space as a numeric value
or symbol, thus reducing the occurrence of garbled characters.
Configure in Menu [2-04] TX UOS
Setting Value Off/ On (default)
On: Uses encode UOS.
Off: Does not use encode UOS.
Sending a Newline Code at the Start or End of a
Transmission
A newline code (CR+LF) can be sent out when RTTY encode/
decode starts or ends. A line break is inserted before and after the
RTTY message on the decode screen of the receiving station,
which makes it easier to identify the transmitted RTTY message.
Configure in Menu [2-05] Automatic Newline Insertion
Setting Value Off/ On (default)
On: Sends out a newline code.
Off: Does not send out a newline code.
RTTY Parameters
Configuring the Mark Frequency
Configure the frequency of the mark signal that is used for
communication in the RTTY (FSK) mode. The 1275 Hz frequency is
referred to as a low tone, and the 2125 Hz frequency as a high tone.
The high tone is used under normal circumstances.
Configure in Menu [2-08]
FSK Tone Frequency
Setting Value 1275/ 2125 (default) [Hz]
Configuring the RTTY Shift Width
The difference between the mark signal frequency and space
signal frequency is called shift width. Configure the shift width
during communication in the RTTY mode.
Configure in Menu [2-06]
FSK Spacing
Setting Value 170 (default)/ 200/ 425/ 850 [Hz]
RTTY shift width cannot be altered when the RTTY
communication screen is open.
When the shift width in RTTY exceeds 170 Hz, the audio
peak filter for the selected band cannot be set to ON.
To operate in the RTTY mode using the built-in
demodulator, encoder and decoder of this transceiver,
configure the setting to “170 [Hz]”.
COMMUNICATING AIDS 5
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77


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