FT-757GX2_使用说明书手册_HB9FAX

FT-757GXIDownloaded byHF ALL MODERadioAmateur.EUCOMPUTER AIDED TRANSCEIVER=492588GENERAL DESCRIPTIONThe FT-757GXII combines the finest features of its famous predecessor,the FT-757GX,with new developments in response to technological advances and to themost popular requests from serious hf operators.New advances in digital con-trol and computer-aided manufacturing methods allow the FT-757GXII to offergreat versatility and operator convenience on all modes and all hf amateurradio bands,with 100 watts of PEP transmitter power output on the amateurbands,and general coverage reception from 0.15 to 30 MHz.Special new digital features include operator selectable mode-dependent tuningsteps,ten memory channels which store mode as well as frequency,auto-resumeloop scanning between dual VFOs (or adjacent memories),a special clarifiermemory,and an improved CAT (Computer Aided Transceiver)System for simplifiedprogramming and more advanced control by an external computer.A 40dB IF Notch filter is provided along with continuously adjustable IF Shiftfor minimizing interference during SSB,CW and ECSS reception of AM signals.Wideband AM and narrowband CW IF filters are included as standard.A switch-able RF amplifier and 20dB attenuator are provided to optimize sensitivity anddynamic range on all frequencies under a wide variety of conditions,while thenoise blanking pulse width can be set on the front panel,continuously adjust-able from narrow (ignition-type)to wide ("woodpecker")blanking pulse widths.Full break-in QSK CW operation is provided with Yaesu's custom-designed elec-tronic keyer built in,as a standard feature.New high voltage solid statetransmit/receive switching circuitry is provided for direct t/r control of awide variety of QSK and non-QSK linear amplifiers.-1-