FCC ID: K66FT-857
Operating Manual
Vertex Standard Co., Ltd.
39
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 terminal 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 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 monitor ALC voltage. If not, press the [F] key momentarily,
then rotate the MEM/VFO CH knob to select to select Multi Function Row “i” [MTR, -----, DISP], then press the
[A](MTR) or [B] key so as to select metering of ALC (“ALC” icon will appear at the upper of the [B] key).
5. Press and hold in the [F] key for one second to enter the Menu mode, then rotate the MEM/VFO CH knob to select
Menu Mode No-037 [DIG GAIN].
6. Following the instructions for your TNC’s software, activate the transmitter from the computer keyboard; this should
cause the AFSK output from the TNC to be sent to the radio. While transmitting, view the ALC meter; a few “dots” of
ALC indication should be observed. If not, rotate the DIAL knob to adjust the AFSK level within the FT-857 for
seven to eight dots of indication on the ALC meter.
7. Press and hold in the [F] key for one second to save the new AFSK level setting and return to normal
operation. You are now ready for full RTTY operation.
Because RTTY is a continuous-duty transmission mode, try to keep your transmission short when running on battery
power, so as to minimize current drain.
PSK31 Operation
Two dedicated PSK31 modes are available, one each for USB-side and LSB-side injection. For BPSK work, the injection
does not matter, but for QPSK the two working stations must use the same sideband.
Connect the FT-857 to your computer’s sound card or interface, per thenillustration.
Setup for PSK31 operation is basically identical to that previously described for RTTY operation. As before, use the
“DIG” mode. However, in Menu Mode No-038 [DIG MODE], select “PSK31-L” (for LSB injection) or “PSK31-U” (for
USB injection). As with RTTY, Menu #38 may be used to set the drive to the transmitter. And the YF-122C 500 Hz filter
may also be utilized, as described previously.
“USER” Defined Digital Modes
Also provided in the FT-857 are two convenient “USER” Digital modes, one each providing USB- and LSB-side injection,
which may be used for SSTV, Fax, Pactor, and other digital operating modes.
Here is an example involving the configuration of the USER mode for JT44 (WSJT) operation with USB-side injection