Yaesu FT-1900E Operating Manual

61FT-1900E OPERATING MANUALThe FT-1900E may be used for 1200 bps Packet operation, using most all commonly-available Terminal Node Controllers (TNCs). Connections between the transceiver and theTNC are accomplished via the front panel Microphone connector and rear panel ExternalSpeaker jack, per the diagram below.The audio level from the receiver to the TNC may be adjusted by using the VOL knob, aswith voice operation. The input level to the FT-1900E from the TNC may be adjusted viaSet Mode Item “27 MCGAIN;” see page 64 for details.Be sure to turn the transceiver and TNC off before connecting the cables, so as to preventvoltage spikes from possibly damaging your transceiver.Remember to readjust the default microphone input level to “LVL 5” (Set Mode Item “27MCGAIN”) when Packet operation is finished.PACKET O PERATIONPin 4: GNDPin 5: PACKET TX INPin 6: PTTPACKET RX OUTRJ12/66 Position 6 ContactModular Plug2-contact 3.5-mmMini Phone PlugEXT SP REAR PANEL( )MIC ( )DATAOUTDATAIN PTT