38
FT-817
ND
Operating Manual
D
IGITAL
M
ODE
O
PERATION
(
SSB-B
ASED
AFSK
)
The
FT-817
ND
provides extensive capability for digital mode operation on the HF, VHF,
and UHF bands. The use of AFSK (Audio Frequency-Shifted Keying) configurations al-
lows a wide variety of different communication modes to be utilized. The Menu provides
for specific digital mode selections, which include custom BFO offsets to optimize the
receive and transmit passbands for the mode selected.
Before beginning Digital operation, you need to define which Digital mode will be utilized.
To do this, use Menu #26 as follows (in this example, we will set up RTTY as the Digital
mode):
1. Press and hold in the
key for one second to enter the Menu mode.
2. Rotate the
knob to select Menu #26 (
DIG MODE
).
3. Rotate the
knob to select “
RTTY
.”
4. Press and hold in the
key for one second to save the new setting and exit.
Use this technique to set up any digital mode.
RTTY (Radio TeleType) Operation
The “RTTY” mode on the
FT-817
ND
is based on LSB-side carrier injection, in accordance
with long-standing amateur practice. If you need USB-side injection for your application,
see the “User” mode discussion below.
1. Connect your TNC (Terminal Node Controller) or terminal modem to the
FT-817
ND
’s
rear-panel
DATA
jack, per the illustration.
2. Press the
/
key, as needed, to select the DIG mode (the “
DIG
” icon
will appear on the display). Be certain to use the “TX Audio” line from your TNC, not
an “FSK Key” line, for the transmit-data connection.
3. Press the
/
key, as needed, to select the DIG mode (the “
DIG
” icon
will appear on the display). You should now be able to tune around the band, and any
RTTY signals heard should be capable of being decoded.
T
RANSMITTER
O
PERATION
Note
Maximum Input Lebel: 1.0 V pp
Impedance: 10 k
Ω
Ground to Transmit
Maximum Output Level: 300 mVpp
Impedance: 10k
Ω
Pin Label
DATA IN
PTT
DATA OUT
Содержание FT-817ND
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