Yaesu FT-2000D, Руководство по эксплуатации

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Page 109 FT-2000D O
PERATING
M
ANUAL
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
Before commencing RTTY operation, please direct your
attention to the setup steps shown in the chart to the right.
B
ASIC
S
ETUP
1. Press the [
RTTY
] button to enter the RTTY mode.
One press of the [ RTTY
] button 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.
To switch to USB-side injection in RTTY, press the
[
RTTY
] button once more. Both the “RTTY” and
“USB” LEDs will now be illuminated. Repeatedly
pressing the [
RTTY
] button 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.
N
OTE
:
If you anticipate making data transmissions of longer than
a few minutes, we recommend that you use the [
RF PWR
]
knob to reduce the transmitter power to 1/2 ~ 1/3 of its
normal maximum.
M
ENU
I
TEM
A
VAILABLE
V
ALUES
078 rtty R PLRTY nor (normal) / rEU (reverse)
079 rtty T PLRTY nor (normal) / rEU (reverse)
080 rtty RTY OUT nAin (Main) / Sub (Sub)
081 rtty OUT LEL 0 ~ 100
082 rtty SHIFT 170/200/425/850 Hz
083 rtty TONE 1275/2125 Hz
RTTY
(
R
ADIO
T
ELETYPE
)
O
PERATION
A
DVICE
:
ˆ The Mark/Space Shift utilized in most Amateur RTTY
operation is 170 Hz. Other shifts may be configured,
however, using Menu item “
082 rtty SHIFT .”
The FT-2000D is set up for “high tone” operation (cen-
tered on 2125 Hz) by default, but you may configure it
for low tone (1275 Hz) operation using Menu item “
083
rtty TONE .”
ˆ 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 “
078 rtty R PLRTY ” to
“
rEU rEU
rEU rEU rEU
” (“Reverse”) to see if that permits copy. A sepa-
rate Menu item permits reversal of your transmitter’s
Mark/Space polarity: “
079 rtty T PLRTY .”
Q
UICK
P
OINT
:
In the FT-2000D , “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.
FSK
OUT
PTT
FSK
IN
① ④
③ ②
RTTY
RTTY JACK RTTY Machine
Pin 1 (SHIFT)
Pin 2
Pin 3
Pin 4
(RX OUT)
(PTT)
(GND)
FSK OUT
AF IN
PTT
GND