Yaesu FT-847 Operating Manual

Also see for FT-847: Technical supplement Technical supplement Technical supplement Modification

Contents

28 FT-847 OPERATING MANUAL(1) 13.8V DC JackThis is the main DC input jack for the transceiver. Thespecified voltage is 13.8V DC, negative ground(±10%), and maximum current draw is 22 Amperes.(2) GND LugFor best performance and safety, this Ground lugshould be connected to a good earth ground using ashort, heavy, braided cable.(3) KEY JackThis 3-pin ¼” (“stereo”) jack may be used for connec-tion to a straight key, an external electronic keyer, or akeyer paddle. When connecting to an external elec-tronic keyer or computer-driven keying interface, besure that the external device is set up for “positive”voltage keying. The key-up voltage is +5 V DC, andthe key-down current is 2 mA.(4) CAT PortThis DB-9 connector is used for interconnection to apersonal computer’s serial port to enable computer-assisted operation. Use a “null modem” (not “straight”)RS-232C serial data cable; no “level converter” orother hardware interface should be required.Rear Panel Connectors(5) TUNER ConnectorThis 8-pin mini-DIN connector is used for connectionto the optional FC-20 External Automatic AntennaTuner.(6) PKT ConnectorThis 6-pin mini-DIN connector accepts AFSK inputfrom a Terminal Node Controller (TNC). It also pro-vides fixed-level receiver audio output, PTT, andGround lines. See the section on “FM PACKET TNCINTERFACING” for details of the correct levels and im-pedances required for proper operation.(7) DATA IN/OUT JackThis 3.5 mm, 3-pin miniature phone jack providesconstant-level receiver audio output on the ring con-tact, and accepts transmit audio input and PTT on thetip contact, for AFSK use with a TNC for RTTY orother digital operating modes. See the section on“AFSK TNC CONNECTIONS” for details of the correctlevels and impedances required for proper operation.