Digital Mode Operation (Ssb-Based Afsk); Rtty (Radio Teletype) Operation - Yaesu FT-857D Operating Manual

D M
IGITAL
The FT-857 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 #38 as follows (in this example, we will set up RTTY as the Digital
mode):
1. Press and hold in the [ FUNC ] key for one second to enter the Menu mode.
2. Rotate the SELECT knob to recall Menu Mode No-001 [ EXT MENU ] , then rotate the
DIAL to change the setting to "ON" to enable the extended Menu Mode.
3. Rotate the SELECT knob to select Menu Mode No-038 [ DIG MODE ] .
4. Rotate the DIAL knob to select "RTTY-L" or "RTTY-U" (see discussion below).
5. Press and hold in the [ FUNC ] key for one second to save the new setting and exit.
Use this basic technique to set up any digital mode.

RTTY (Radio TeleType) Operation

The "RTTY" mode on the FT-857 is available in either LSB-side or USB-side BFO injec-
tion. Long-standing Amateur practice calls for the use of LSB-side injection, but some ap-
plications require that you use USB-side injection.
1. Connect your TNC (Terminal Node Controller) or termi-
nal modem to the FT-857's rear-panel DATA jack, per
the illustration. Be sure to use the "TX AUDIO" line, not
an "FSK" line, for the transmit data connection to the
FT-857.
2. Press the [ MODE ( t ) ] or [ MODE ( u ) ] 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.
3. If the optional YF-122C 500 Hz filter or YF-122CN
300 Hz filter has been installed, it may be used for RTTY
work. Recall Multi Function Row "n" [ CFIL, – – –, – – – ] ,
then press the [ B ](–) or [ C ](–) key to engage the narrow
filter.
4. To set up the transmit side, be sure that the Meter is set to
FT-857 Operating Manual
T
RANSMITTER
O
ODE PERATION
O
PERATION
( SSB-B
ASED
AFSK )
AFSK
AF IN OUT PTT
DATA OUT
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