Icom IC-7410 Instruction Manual page 53

D
Received characters are occasionally garbled when
the Mark and Space signals are reversed. This rever-
sal can be caused by incorrect TNC connections, set-
ting or commands.
To receive reversed RTTY signals correctly, select the
RTTY reverse mode.
Push [RTTY] to alternately select the RTTY mode
or RTTY reverse mode.
D
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 In the RTTY mode, push [MENU] to display the "M1"
screen (Menu 1).
w Push [RTTY](F-4) to display the "RTTY" screen.
e Push [F-2](DEC) to turn ON the RTTY decoder.
r Push [F-2] to turn ON the Hold function to hold the
current screen.
H" appears when this function is turned ON.
t Hold down [F-3] for 1 second to clear the displayed
characters
, if desired.
H" disappears at the same time as the displayed char-
acters are cleared. (The hold function is cancelled.)
y Push [MENU] to return to the previous display.
If some characters are displayed when no signal is re-
ceived, adjust the RTTY decoder threshold level.
q Select the RTTY decoder screen as described
above.
w Push [F-1](ADJ) to select the threshold level adjust-
ment mode.
e Rotate [DIAL] to adjust the RTTY decoder threshold
level.
ting, if desired.
r Push [MENU] to save, and return to the previous
display.
The number of the decoder display lines, the Un-
Shift On Space (USOS) function and new line code
can be set in the RTTY Set mode. (p. 48)
Normal
170 Hz 2125 Hz
Space
Mark
M1
AGC
RTTY
D E C
45BPS
DEC
MK ⁄ SFT
A D J
H F2 : HOLD
Appears when the Hold function
is turned ON.
45BPS
DEC
MK ⁄ SFT
A D J
F2 : HOLD
45BPS
DEC
MK ⁄ SFT
9
F2 : HOLD
-
Threshold level display
RECEIVE AND TRANSMIT
Reverse
2125 Hz 170 Hz
Space
BFO BFO
1 / 4 RTTY S C P
T P F S E T
BAUDOT
2125 ⁄ 170
F3 : CLR
BAUDOT
2125 ⁄ 170
F3 : CLR
BAUDOT
2125 ⁄ 170
F3 : CLR
4
Mark
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
46