Specifications
63FT-857D Operating Manual
TRANSMITTER OPERATION
DIGITAL MODE OPERATION
(
SSB-BASED AFSK
)
The FT-857D 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 #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 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-857D is available in either LSB-side or USB-side BFO
injection. Long-standing Amateur practice calls for the use of LSB-side injection, but some
applications require that you use USB-side injection.
1. Connect your TNC (Terminal Node Controller) or ter-
minal 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
(
)
]
or
[
MODE
(
)
]
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 nar-
row filter.
4. To set up the transmit side, be sure that the Meter is set to
P
T
T
D
A
T
A
I
N
G
N
D
AFSK
OUT
AF IN PTT
DATA OUT