Yaesu FT-817 Operating Manual

Also see for FT-817 -: Brochure & specs Operating manual Technical supplement Manual Modification Instructions

38 FT-817 Operating ManualDIGITAL M ODE O PERATION (SSB-BASED AFSK)The FT-817 provides extensive capability for digital mode operation on the HF, VHF, andUHF bands. The use of AFSK (Audio Frequency-Shifted Keying) configurations allows awide 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 andtransmit 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 Digitalmode):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) OperationThe “RTTY” mode on the FT-817 is based on LSB-side carrier injection, in accordancewith 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-817’srear-panel DATA jack, per the illustration.2. Press the / key, as needed, to select the DIG mode (the “DIG” iconwill 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” iconwill appear on the display). You should now be able to tune around the band, and anyRTTY signals heard should be capable of being decoded.TRANSMITTER O PERATIONPin12345NoteMaximum Input Lebel1.0 V ppImpedance: 10 kΩGround to Transmit–Maximum Output Level: 300 mVppImpedance 10kΩ–LabelDATA INPTT–DATA OUT–