Operation Manual

38 FT-817ND Operating Manual
DIGITAL MODE OPERATION
(
SSB-BASED AFSK
)
The FT-817ND 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-817ND 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-817ND’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.
TRANSMITTER OPERATION
Note
Maximum Input Lebel: 1.0 V pp
Impedance: 10 kΩ
Ground to Transmit
Maximum Output Level: 300 mVpp
Impedance: 10kΩ
Pin Label
DATA IN
PTT
DATA OUT