Yaesu FT DX 9000MP CONTEST - DATA MANAGEMENT..., Operation Manual

Page: 141 / 180

Page 139 FT
DX
9000MP O
PERATION
M
ANUAL
RRRRRTTY TTY
TTY TTY
TTY (((((RRRRR
ADIO ADIO
ADIO ADIO ADIO
TTTTT
ELE ELE
ELE ELE ELE
TTTTT
YPE YPE
YPE YPE YPE
))))) O O O O O
PERA PERA
PERA PERA PERATION
TION
TION TION TION
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 oeration, 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.
S
ETTING
U
P FOR
RTTY O
PERATION
1. Press the [
RTTY ] Mode switch to enter the RTTY
mode.
One press of the [
RTTY
] Mode switch will en-
gage RTTY operation using “LSB” injection,
which is generally used in the Amateur service. In
this mode, both the “RTTY” and “LSB” LEDs will
light up.
To switch to USB-side injection in RTTY, press
the [
RTTY
] Mode switch once more. Both the
“RTTY” and “USB” LEDs will now be illumi-
nated. Repeatedly pressing the [
RTTY
] Mode
switch will toggle between LSB and USB injec-
tion on RTTY.
2. 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.
N N N N N
O O
O O
OTE TE
TE TE
TE
If you anticipate making data transmissions of
longer than a few minutes, we recommend that you
use the [
RF PWR
] control to reduce the transmit-
ter power to 1/2 ~ 1/3 of its normal maximum.
Before commencing RTTY operation, please direct your
attention to the setup steps below.
B
ASIC
S
ETUP
Menu Mode Setup
MODE-RTY 073 POLARITY-R NOR/REV
MODE-RTY 074 POLARITY-T NOR/REV
MODE-RTY 075 RTTY SHIFT 170Hz
MODE-RTY 076 RTTY TONE 2125Hz
FSK OUT PTT AF IN
① ④
③ ②
RTTY
RTTY JACK RTTY Machine
Pin 1
Pin 2
Pin 3
Pin 4
AF IN
PTT
GND
FSK OUT
A A A A A
D D D D DVICE VICE VICE VICE VICE
There is no adjustment of the receiver output
level from Pin 2 (“RX OUT”) of the [
RTTY
]
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 shofts may
be configured, however, using Menu item
“
MODE-RTY 075 RTTY SHIFT ”.
The FT
DX
9000MP 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 “
MODE-RTY 076
RTTY TONE ”.
You may find that you are unable to decode
some RTTY stations, even if they are of suffi-
cient signal strength. If this is observed, there
may be a Mark/Space polarity problem between
your station and the other station. If so, try set-
ting Menu item “
MODE-RTY 073 POLAR-
ITY-R ” to “REV” (“Reverse”) to see if that
permits copy. A separate Menu item permits re-
versal of your transmitter’s Mark/Space polar-
ity: “
MODE-RTY 074 POLARITY-T ”.
Q Q Q Q Q
UICK UICK
UICK UICK UICK
P P P P P
OINT OINT
OINT OINT OINT
In the FT
DX
9000MP , “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 occur. Use the
“Packet” mode for AFSK-based Baudot and other data modes.