36
4
RECEIVE AND TRANSMIT
D
R
RT
TT
TY
Y ((F
FS
SK
K)) o
op
pe
erra
attiio
on
n
➀
Connect a terminal unit as at left.
➁
Select RTTY (or
å
RTTY—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.
• Use [
(F-1)
1/4
] in the
M4
display when critical setting is
required.
➄
Operate the connected PC or TNC (TU).
P
PR
RE
ES
SE
ET
TT
TIIN
NG
G F
FO
OR
R R
RT
TT
TY
Y
T
To
on
ne
e ffrre
eq
qu
ue
en
nc
cy
y
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).
S
Sh
hiifftt ffrre
eq
qu
ue
en
nc
cy
y
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).
R
RT
TT
TY
Y k
ke
ey
yiin
ng
g
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).
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.
• Use [
(F-1)
1/4
] in the
M4
display when critical setting is
required.
➄
Operate the connected PC or TNC (TU).
P
PR
RE
ES
SE
ET
TT
TIIN
NG
G F
FO
OR
R R
RT
TT
TY
Y
T
To
on
ne
e ffrre
eq
qu
ue
en
nc
cy
y
Same as above.
S
Sh
hiifftt ffrre
eq
qu
ue
en
nc
cy
y
Same as above.
R
RT
TT
TY
Y k
ke
ey
yiin
ng
g
Same as above.
R
RT
TT
TY
Y rre
ev
ve
errs
se
e m
mo
od
de
e
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
å
RTTY (RTTY reverse) mode.
➥
Push [MODE] for 1 sec. (while RTTY is selected) to
select
å
RTTY mode.
• Check the receive signal.
CH
VFO A
RTTY
M1 SPL A/B A=B
RTTY mode is selected.
P
O
S1
5
5
3
7
9
20
40
10
60dB
RTTY
Q2 RTTY TONE
RTTY mark frequency
is set to 2125 Hz.
2125 and 1615 Hz are
available.
RTTY
Q3 RTTY SHIFT
RTTY shift frequency is
set to 170 Hz.
170/200/425 Hz are
available.
RTTY
Q4 RTTY KEYING
RTTY keying is set to
‘normal’.
normal: key open=mark
key close=space
reverse: key open=space
key close=mark
D
R
RT
TT
TY
Y ((A
AF
FS
SK
K)) o
op
pe
erra
attiio
on
n
Reverse
Normal
BFO
170
Hz
2125
Hz
170
Hz
2125
Hz
BFO
mark
space
displayed freq.
displayed freq.
mark
space
IC-706MKIIG.qxd 02.3.27 13:53 Page 36
