Yaesu FT-450D User Manual

Page 74 FT-450D OPERATION MANUAL
RTTY
(
RADIO TELETYPE
)
O
PERATION
Most RTTY operation today is accomplished using a TNC or other computer-based system that utilizes AFSK
tones. For RTTY operation using a Terminal Unit (TU) or the “FSK” output from a TNC, please see the discus-
sion below. See also the illustration for details regarding connection to your TU.
SETTING UP FOR RTTY OPERATION
Before commencing RTTY operation, please direct
your attention to the setup steps shown in the chart
to the right.
BASIC SETUP
1. Press the
[
MODE
]
/
[
MODE
]
buttons several
times to indicate both the “ ” and “ ” icons
on the display. Engage the RTTY operation us-
ing “LSB” injection, which is generally used in the
Amateur service.
2. When you begin typing on your TU or computer
keyboard, the command to transmit should auto-
matically be sent to the transceiver, causing it to
enter the transmit mode.
NOTE:
If you anticipate making data transmissions of longer
than a few minutes, we recommend that you reduce
the transmitter power to 1/2 ~ 1/3 of its normal maxi-
mum via Menu Item “RFPOWER”.
QUICK POINT:
In the FT-450D, “RTTY” is a mode defined as being
an “FSK” mode, whereby the closing and opening of
a keying line (to ground) causes the Mark/Space tones
to alternate. 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 oc-
cur. Use the “Packet” mode for AFSK-based Baudot
and other data modes.
MENU ITEM
RTY SFT
(
RTTY SHIFT
)
RTY TON
(
RTTY TONE
)
RTYRPOL
(
RTTY RX POLARITY
)
RTYTPOL
(
RTTY TX POLARITY
)
AVAILABLE VALUES
170 / 200 / 425 / 850 Hz
1275 / 2125 Hz
NOR / REV
NOR / REV
ADVICE:
 There is no adjustment of the FSK input level
(FSK IN of the DATA jack) on the rear panel;
please make any needed level adjustments at the
TU side.
 The Mark/Space Shift utilized in most Amateur
RTTY operation is 170 Hz. Other shifts may be
configured, however, using Menu Item “RTY SFT”.
The FT-450D is set up for “high tone” operation
(centered on 2125 Hz) by default, but you may
configure it for low tone (1275 Hz) operation us-
ing Menu Item “RTY TON”.
 You may find that you are unable to decode some
RTTY stations, even if they are of sufficient sig-
nal strength. If this is observed, there may be a
Mark/Space polarity problem between your sta-
tion and the other station. If so, try setting Menu
Item “RTYRPOL” to “REV” (“Reverse”) to see if
that permits copy. A separate Menu Item permits
reversal of your transmitter’s Mark/Space polar-
ity: “RTYTPOL.”
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
INPUT
DC 13.8V
22A
ANT
GND
EXT
SPKR
CATLINEARTUNERDATA
TU
N.C.
GND
PTT
FSK OUT
AF IN
N.C.
DATA JACK
DATA IN (Pin 1)
Pin 6
GND (Pin 2)
DATA PTT (Pin 3)
FSK IN (Pin 4)
DATA OUT (Pin 5)
SQL OUT(
)

Yaesu FT-450D Specifications

General

Product type	Portable CB radio
Product color	Black
Housing material	Aluminum
Microphone included	Yes
Input voltage	13.8 V
Display type	LCD
Output power	100 W
Frequency range	0.03 - 56 MHz
Channels quantity	500 channels

Weight and Dimensions

Depth	217 mm
Width	229 mm
Height	84 mm
Package weight	40000 g