Icom I706MKTMG Instruction Manual page 39

D RTTY (FSK) operation
➀
Connect a terminal unit as at left.
➁
Select RTTY (or åRTTY—see bottom of page)
mode with [MODE].
➂
Select the desired FSK tone/shift frequencies and
keying polarity as below.
➃
Set the desired frequency with the main dial.
1/4] in the M4 display when critical setting is
• Use [
(F-1)
required.
➄
Operate the connected PC or TNC (TU).
PRESETTING FOR RTTY
Tone frequency
➀
Push [DISPLAY] for 2 sec. to select quick set mode.
➁
Push [MENU] one or more times to select Q2
RTTY TONE; then rotate the main dial to select
the desired tone frequency (p. 48).
Shift frequency
➀
Push [DISPLAY] for 2 sec. to select quick set mode.
➁
Push [MENU] one or more times to select Q3
RTTY SHIFT; then rotate the main dial to select
the desired shift frequency (p. 48).
RTTY keying
➀
Push [DISPLAY] for 2 sec. to select quick set mode.
➁
Push [MENU] one or more times to select Q4
RTTY KEYING; then rotate the main dial to
select the desired keying polarity (p. 48).
D RTTY (AFSK) operation
➀
Connect a terminal unit as at left.
➁
Select SSB (LSB) mode with [MODE].
• Generally, LSB is used on the HF bands and FM is
used for the VHF band.
➂
Select the desired FSK tone/shift frequencies and
keying polarity as below.
➃
Set the desired frequency with the main dial.
1/4] in the M4 display when critical setting is
• Use [
(F-1)
required.
➄
Operate the connected PC or TNC (TU).
PRESETTING FOR RTTY
Tone frequency
Same as above.
Shift frequency
Same as above.
RTTY keying
Same as above.
RECEIVE AND TRANSMIT
RTTY
VFO A
S1 3 5 7 9 20 40 60dB
P 5 10
O
M1 SPL A/B A=B
RTTY
Q2 RTTY TONE
RTTY
Q3 RTTY SHIFT
RTTY
Q4 RTTY KEYING
RTTY reverse mode
Received characters are occasionally garbled when
the receive signal is reversed between MARK and
SPACE. This reversal can be caused by incorrect
TNC connections, settings, commands, etc.
To receive a reversed RTTY signal correctly, select
åRTTY (RTTY reverse) mode.
➥ Push [MODE] for 1 sec. (while RTTY is selected)
to select åRTTY mode.
• Check the receive signal.
Normal
space mark
2125
170
Hz
Hz
BFO
displayed freq.
RTTY mode is selected.
CH
RTTY mark frequency
is set to 2125 Hz.
2125 and 1615 Hz are
available.
RTTY shift frequency is
set to 170 Hz.
170/200/425 Hz are
available.
RTTY keying is set to
'normal'.
normal: key open=mark
key close=space
reverse: key open=space
key close=mark
Reverse
space mark
2125
170
Hz
Hz
BFO
displayed freq.
4
36