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4
RECEIVE AND TRANSMIT
2001 NEW
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
1/4
RTY
SCP
DEC
FIL
SET
ADJ
RTTY-FIL
ON
Push [F4]
Push [F2]
Appears while the RTTY decoder screen is freezed
with [F2] operation.
Push [F3] to erase the displayed characters.
DD
RTTY decoder
The transceiver has an RTTY decoder for Baudot
(mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps).
An external terminal unit (TU) or terminal node con-
nector (TNC) is not necessary for receiving a Baudot
signal.
q Push [CW/RTTY] to select RTTY mode.
After RTTY mode is selected, push [CW/RTTY] for 1 sec.
to select RTTY-R mode.
w Push [MENU] several times to select M1.
e Push [F4 RTY] to select RTTY menu.
r Push [F4 FIL] to turn the RTTY lter ON.
The RTTY decoder does not function when the RTTY l-
ter is turned OFF.
t Push [F2 DEC] to turn the RTTY decoder ON.
RTTY decoder screen appears.
y Push [F2] to freeze the current screen.
•“H appears while the function is in use.
u Push [F3] for 1 sec. to clear the displayed charac-
ters.
i Push [MENU] to exit the RTTY decoder screen.
Setting the decoder threshold level
Adjust the RTTY decoder threshold level if some char-
acters are displayed when no signal is received.
q Call up the RTTY decoder screen as described
above.
w Push [F1 ADJ] to select the threshold level setting
condition.
e Rotate the tuning dial to adjust the RTTY decoder
threshold level.
Push [F3] for 1 sec. to select the default condition.
r Push [MENU] to exit the RTTY decoder screen.
The number of line of text can be selected from 2 or
3 in the display. The UnShift On Space (USOS)
function and new line code can be set in the RTTY
set mode. (p. 39)
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
ADJ
å
9
Push [F1]
Threshold level indication
IC-7400.qxd 02.4.2 11:35 Page 38
51


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