Yaesu FT DX 9000D - COMPUTER AIDED TRANSCEIVER, Руководство по эксплуатации

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Page 123 FT
DX
9000D O
PERATION
M
ANUAL
RTTY (R
ADIO
T
ELE
T
YPE
) O
PERATION
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.
S
ETTING
U
P FOR
RTTY O
PERATION
1. Press the RTTY Mode switch (# ) to enter the
RTTY mode.
H
One press of the RTTY Mode switch will engage 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.
H
To switch to USB-side injection in RTTY, press the RTTY
mode switch once more. Both the “RTTY” and “USB” LEDs
will now be illuminated. Repeatedly pressing the RTTY but-
ton will toggle between LSB and USB injection 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.
Note
If you anticipate making data transmissions of longer
than a few minutes, we recommend that you use the
RF PWR control (# ) to reduce the transmitter
power to 1/2 ~ 1/3 of its normal maximum.
Advice
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 shifts may be configured,
however, using Menu item “MODE-RTY 067 RTTY
SHIFT.”
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
2 1
Before commencing RTTY operation, please direct your
attention to the setup steps below.
B
ASIC
S
ETUP
The FT
DX
9000D is set up for “high tone” operation
(centered on 2125 Hz) by default, but you may con-
figure it for low tone (1275 Hz) operation using Menu
item “MODE-RTY 068 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 “MODE-RTY 065
POLARITY-R” to “REV” (“Reverse”) to see if that
permits copy. A separate Menu item permits reversal
of your transmitter's Mark/Space polarity: “MODE-
RTY 066 POLARITY-T.”
Quick Point
In the FT
DX
9000D, “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.
Menu Mode Setup
MODE-RTY 065 POLARITY-R NOR/REV
MODE-RTY 066 POLARITY-T NOR/REV
MODE-RTY 067 RTTY SHIFT 170Hz
MODE-RTY 068 RTTY TONE 2125Hz