Digital Mode Operation (Ssb-Based Afsk); Rtty (Radio Teletype) Operation - Yaesu FT-818ND Operating Manual

Transmitter Operation
Digital Mode Operation ( SSB-Based AFSK )
The FT-818 provides extensive capability for digital mode operation on the HF, VHF, and
UHF bands. The use of AFSK (Audio Frequency-Shifted Keying) configurations allows a
wide variety of different communication modes to be utilized. The Menu provides for spe-
cific 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
2. Rotate the
3. Rotate the
4. Press and hold in the
Use this technique to set up any digital mode.

RTTY (Radio TeleType) Operation

The "RTTY" mode on the FT-818 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-818's
rear-panel DATA jack, per the illustration.
2. Press the
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
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.
Pin Label
Maximum Input Lebel:
DATA IN
1.0 V pp Impedance: 10 kΩ
PTT Ground to Transmit
Maximum Output Level:
DATA OUT
300 mVpp Impedance: 10kΩ
34
key for one second to enter the Menu mode.
knob to select Menu #26 (DIG MODE).
knob to select "RTTY".
key for one second to save the new setting and exit.
/ key, as needed, to select the DIG mode (the "DIG"
/ key, as needed, to select the DIG mode (the "DIG"
KEY
:
INPUT DC13.8V
GND
Note
ANT
DATA ACC
DATA OUT
PTT
DATA IN
GND
AFSK
PTT OUT
AF IN