Icom IC-7410 Instruction Manual - Page 53

About the RTTY reverse mode, RTTY decoder

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4 RECEIVE AND TRANSMIT D About the RTTY reverse mode Received characters are occasionally garbled when the Mark and Space signals are reversed. This reversal can be caused by incorrect TNC connections, setting 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 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 connector (TNC) is not necessary for receiving a Baudot signal. q In the RTTY mode, push [MENU] to display the "M1" screen (Menu 1). w P ush [RTTY](F-4) to display the "RTTY" screen. e P ush [F-2](DEC) to turn ON the RTTY decoder. • RTTY decoder screen appears. r P ush [F-2] to turn ON the Hold function to hold the current screen. • "H" appears when this function is turned ON. • Push [F-2] again to turn OFF the Hold function. t H old 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. • Setting the decoder threshold level If some characters are displayed when no signal is received, adjust the RTTY decoder threshold level. q S elect the RTTY decoder screen as described above. w P ush [F-1](ADJ) to select the threshold level adjustment mode. e R otate [DIAL] to adjust the RTTY decoder threshold level. • Hold down [F-3] for 1 second to reset to the default setting, if desired. r P ush [MENU] to save, and return to the previous display. The number of the decoder display lines, the UnShift On Space (USOS) function and new line code can be set in the RTTY Set mode. (p. 48) Normal 170 Hz 2125 Hz Reverse 2125 Hz 170 Hz Space Mark BFO BFO Space Mark M1 AGC 1 / 4 RTTY S C P RTTY DEC TPF SET DEC 45BPS BAUDOT MK ⁄ SFT 2125 ⁄ 170 A D J H F2 : HOLD F3 : CLR Appears when the Hold function is turned ON. DEC ADJ 45BPS BAUDOT MK ⁄ SFT 2125 ⁄ 170 F2 : HOLD F3 : CLR DEC ≈ 9 45BPS BAUDOT MK ⁄ SFT 2125 ⁄ 170 F2 : HOLD F3 : CLR Threshold level display 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 46

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46
4
RECEIVE AND TRANSMIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
D
About the RTTY reverse mode
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
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
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.
• RTTY decoder screen appears.
r
Push [F-2] to turn ON the Hold function to hold the
current screen.
•“
H
” appears when this function is turned ON.
• Push [F-2] again to turn OFF the Hold function.
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.
• Setting the decoder threshold level
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.
• Hold down [F-3] for 1 second to reset to the default set
-
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
Reverse
170
Hz
170
Hz
2125
Hz
2125
Hz
BFO
BFO
Space
Space
Mark
Mark
AGC
1/4
RTTY
SCP
M1
DEC
TPF
SET
RTTY
DEC
45BPS
BAUDOT
MK ± SFT
2125 ± 170
F2 : HOLD
F3 : CLR
ADJ
H
Appears when the Hold function
is turned ON.
DEC
45BPS
BAUDOT
MK / SFT
2125 / 170
F2 : HOLD
F3 : CLR
≈
9
DEC
45BPS
BAUDOT
MK / SFT
2125 / 170
F2 : HOLD
F3 : CLR
ADJ
Threshold level display