Specifications
Page 101FT-950 OPERATING MANUAL
Most RTTY operation today is accomplished using a TNC or other computer-based system that utilizes AFSK tones. As
such, the previous discussion on LSB-mode “Packet” operation will apply for Baudot operation, as well. For RTTY opera-
tion using a Terminal Unit (TU) or the “FSK” output from a TNC, please see the discussion below. See also the illustration
for details regarding connection to your TU.
SETTING UP FOR RTTY OPERATION
Before commencing RTTY operation, please direct your atten-
tion to the setup steps shown in the chart to the right.
BASIC SETUP
RTTY
(
RADIO TELETYPE
)
O
PERATION
1. To engage RTTY operation using “LSB” injection,
which is generally used in the Amateur service. Press
the
[
RTTY/PKT
]
button repeatedly until both the
“ ” and “ ” icons appear on the display.
2. To switch to USB-side injection in RTTY, press and
hold in the
[
RTTY/PKT
]
button. Both the “ ” and
“ ” icons will appear on the display.
3. When you begin typing on your TU or computer key-
board, the command to transmit should automatically
be sent to the transceiver, causing it to enter the trans-
mit mode.
NOTE:
If you anticipate making data transmissions of longer than
a few minutes, we recommend that you reduce the trans-
mitter power to 1/3 ~ 1/2 of its normal maximum via the
Menu item “
111 TGEN TX PWR111 TGEN TX PWR
111 TGEN TX PWR111 TGEN TX PWR
111 TGEN TX PWR”.
ADVICE:
If you need to adjust the output level from the “DATA
OUT” pin (pin 5) of the RTTY/PKT jack on the rear
panel of the transceiver, please use Menu item “
061061
061061
061
RTTY OUT LVLRTTY OUT LVL
RTTY OUT LVLRTTY OUT LVL
RTTY OUT LVL”. For the input level from the TU, there
is no adjustment of the FSK input level (Pin 4) of the
RTTY/PKT jack. Please make any needed level ad-
justments at the TU side.
TO
1
ANT
DC IN
2
FROM
GND
ROT LINEAR TUNER PTT REC REM KEY
DMU CAT
EXT
SPKR
INPUT: DC 13.8 V
22 A
-TUNE
-TUNE
AF
IN PTT
FSK
OUT
F
S
K
I
N
D
A
T
A
O
U
T
D
A
T
A
P
T
T
G
N
D
TU
N.C.
GND
PTT
FSK OUT
AF IN
N.C.
RTTY/PKT JACK
DATA IN (Pin 1)
Pin 6
GND (Pin 2)
DATA PTT (Pin 3)
FSK IN (Pin 4)
DATA OUT (Pin 5)
SQL OUT(
)
MENU ITEM AVAILABLE VALUES
059 RTTY R PLRTY nor
(
normal
)
/ rEU
(
reverse
)
060 RTTY T PLRTY nor
(
normal
)
/ rEU
(
reverse
)
061 RTTY OUT LEL 0 ~ 100
062 RTTY SHIFT 170/200/425/850
(
Hz
)
063 RTTY TONE 1275/2125
(
Hz
)
The Mark/Space Shift utilized in most Amateur RTTY
operation is 170 Hz. Other shifts may be configured,
however, using Menu item “
062 RTTY SHIFT062 RTTY SHIFT
062 RTTY SHIFT062 RTTY SHIFT
062 RTTY SHIFT”. The
FT-950 is set up for “high tone” operation (centered
on 2125 Hz) by default, but you may configure it for
low tone (1275 Hz) operation using Menu item “
063063
063063
063
RTTY TONERTTY TONE
RTTY TONERTTY TONE
RTTY TONE”.
You may find that you are unable to decode some RTTY
stations, even if they are of sufficient signal strength.
If this is observed, there may be a Mark/Space polarity
problem between your station and the other station. If
so, try setting Menu item “
059 RTTY R PLRTY059 RTTY R PLRTY
059 RTTY R PLRTY059 RTTY R PLRTY
059 RTTY R PLRTY” to
“
rEUrEU
rEUrEU
rEU” (“Reverse”) to see if that permits copy. A sepa-
rate Menu Item permits reversal of your transmitter’s
Mark/Space polarity: “
060 RTTY T PLRTY060 RTTY T PLRTY
060 RTTY T PLRTY060 RTTY T PLRTY
060 RTTY T PLRTY”.
QUICK POINT:
In the FT-950, “RTTY” is a mode defined as being an
“FSK” mode, whereby the closing and opening of a key-
ing line (to ground) causes the Mark/Space tones to alter-
nate. The RTTY mode is not an AFSK based mode in this
transceiver, and the AFSK output tones from a TNC will
not cause Mark/Space shifting to occur. Use the “Packet”
mode for AFSK-based Baudot and other data modes.