FT-757GX OPERATING MANUAL YAESU MUSEN CO.,LTD. P.O. BOX 1500FT—757GX HF ALL MODE COMPUTER AIDED TRANSCEIVER GENERAL DESCRIPTION The PT-757GX incorporates the finest features of the latest developments in Amateur transceiver design, with the most recent advances in microprocessor technology and computer-aided manufacturing techniques, to provide full performance sll mode operation as standar¢ on all HF amateur bands, as well as continuous general coverage reception from 05 to 30 MI. Yaesu’s famous IF Shift/Width passband control system allows the operator an almost infinite variety of selectivity settings for minimizing interference during SSB, CW and BCSS reception of AM signels, Wideband AM and narrowband CW filters are also included — as standard accessories. A switchable RF amplifier and 20 dB attenuator are provided to optin its own AGC adjustable from the front panel, from narrow (ignition-type) to wide (wood- pecker) blanking pulse widths. sensitivity and dynamic range under any conditions, while the noise blanker has The diecast top half of the FT-757GX provides a glimpse of the revoltitionary engineering concepts behind the unique transmitter design, which utilizes a new Duct Flow Cooling system to force air throughout the entire transceiver. The thermodynamic efficiency of this sytem makes the FT-757GX by far the smallest transceiver of its kind, yet easily capable of full power (100 W output nominal) RTTY and FM transmission when used with an appropriate heavy duty power supply. ‘The FT-757GX offers full break-in QSK CW operation plus Yaesu's new custom-designed iambic electronic keyer with dot memory using a 4-bit microprocessor built in, as « stand= ard feature, When operating splitfrequency QSK, the FT-757GX provides an automatic momentary check of the transmitting frequency before jumping to the receive frequency, so the operator can watch both frequencies for activity at the same time.For SSB and AM signal punch, the AF speech processor circuit in the PT-7S7GX is a combination AF clipper and compressor designed to provide the optimum possible increase in average speech power with minimum distortion of the signal, Careful filtering before the modulator assures clean output, with a substantial increase in average powei ‘The completely new dual PLL synthesis scheme provides tuning steps of 10 Hz, ineorpo- rating an 8-bit microprocessor which the operator controls from the tuning knob, optional scanning microphone buttons or external home computer (via the CAT System optional Interface Unit). Front panel keys and buttons are also provided for accessing and inte changing eight memory channels plus two VFOs (A/B) and a clarifier with unlimited frequency range, as well as the PMS (Programmable Memory S automatic scanning between two memory channel frequencies with auto stop on those above a preset signal level. All of these features can also be controlled through the CAT system. An internal lithium battery provides complete VFOs, for 5 years or more. san) system, which allows backup for the memories and The three intemal microprocessors perform many of the functions that previously re- quired large numbers of discrete components and controls, so that the simplicity of the FT-757GX, inside and out, belies the highly advanced features available to the operator. The CAD/CAM systems used to lay out and assemble the circuit boards provides a clean, orderly design that is uncluttered and easy to service, while reducing the possibility of human assembly errors to almost nil. Optional accessories include your choice of the MD-1B8 Desktop Scanning microphone ‘or MH-1B8 Handy Scanning microphone. Also, Yaesu has designed the FC-757AT Fully Automatic Antenna Tuner to match the FI-757GX perfectly in all respects. Incorpora- ting its own microprocessor and lithium-backed memory, the FC-757AT can quickly tune your antenna system for m of a button, and then store the settings in memory for almost instant re time. The FC-7S7AT accepts two antennas — or as many as five when use FAS-1-4R Remote Antenna Selector. nimum SWR at the transmitting frequency with just the touch at a later with the Special high duty-cycle power supplies designed for the FT-757GX include the ultra- compact FP-757GX Switching Power Supply and the FP-7S7HD Heavy Duty Series Regulator Power Supply with forced-air cooling and automatic thermal fan control. For light-duty applications, the FP-700 standard power supply may be used. Please read this manual carefully to obtain optimum performance and enjoyment from the FT-157GX, Cooing Fax Exhaust Outlet Heatsink Fins ae y= Fan Motor Local Unit Chassis AIF Unit Shit Plate PA Uni FT-757GX Duct Flow Cooling System z=SPECIFICATIONS TRANSMITTER Frequency range: 160 m band 1.5 to 1,99999 MHz. 80 m band 3.5 to 3.99999 MHz 40 m band 7.0 to 7.49999 MHz 30 m band 10.0 to 10.4999 MHz 20 m band 14.0 to 14.4999 MHz 17 m band 18.0 to 18.4999 MHz 15 m band 21.0 to 21.49999 MHz, 12 m band 24.5 to 24,99999 MHz. 10 m band 28.0 to 29,99999 MHz, Tuning steps 10 Hz and 500 kHz (band step) Emission types LSB, USB (A3J/J3E*), CW (AI/A1A*), ‘AM (A3/A3E*), FM (F3/G3E*) * New emission designation per WARC "79 Power output: SSB.CW,FM 100 W (PEP/DC) w/slight- ly less on 10 m AM 25 W (Carrier) Carrier suppression: better than 40 dB below peak output Unwanted sideband suppression: better than 50 dB below peak output (1 KHz tone) Spurious radiation better than 50 dB below peak output Audio response: less than -6 dB from 300-3000 Hz 3rd order intermodulation distortion: better than -35 dB below peak output (14 MHz, 100 W) Frequency accuracy better than 10 ppm from 0—40°C after 15 min. warm up Modulation type: A3J: Balanced Modulator 3: Low Level Modulator F3: Variable Reactance Modulator Maximum FM deviation: 45 kHz Output impedance: 50 ohms (nominal), unbalanced Microphone impedance: Low (500 to 600 ohms) RECEIVER Frequency range: 500 kHz to 29.99999 MHz (continuous) Circuit type: Triple conve jon superheterodyne range: Unlimited Sensitivity: (CW, SSB and AM figures measured for 10 dB S#N/N) "1.5~30 MHz *4500 kHz~ 1.5 MHz SSB, CW(W), FSK “better than 0,25 ¢V. **better than 2.0 4V cwW(N) “better than 0,16 WV. **better than 1.25 eV AM “better than 1.0 4V— **better than 8.0 #V FM better than 0.6 wV for 12 dB SINAD Intermediate frequencies: 1st IF: 47.060 MHz Qnd IF: 8.215 MHz 3rd IF: 455 kHz FMIF: 455 kHz Image rejection: better than 70 dB IF rejection: better than 70 dB for all frequenciesSelectivity (adjusted for maximum IF width): -64B 60 dB SSB,CW(W),FSK —-2.7kHz 4,5 kHz cwN) 600Hz 1.3 kHz AM GkHz 18 kHz FM 15 kHz 30 kHz NOTE: These figures apply as maximum band- widths with Width control set to maximum, Dynamic range: better than 100 dB (CW(N), 14 MHz) Audio output power: 3 watts minimum (into 4 ohms, with less than, GENERAL Voltage: 13.5 VDC Power consumption: Receiver: 2A Transmit (100 W output): 194 Dimensions (WHD): approximately 238 mm x 93 mm 238 mm; w/o feet and knobs, but w/heatsink Weight: approximately 5.2 kg (11.5 1b.) 10% THD) Audio output impedance: 4 to 16 ohms Specifications subject to change without notice or obligation ACCESSORIES Supplied DC Power Cord (19014900) Switching Power Supply FP-757GX (w/out Fuse) Heavy Duty Power Supply FP-757HD Spare Fuses BT-757GX_.20A (Q0000009) FT-757SX 6A (Q0000012) 3-pin Phone Plug SH3603 _(P0090008) (Electronic Keyer) RCA Plugs STP-58 (0090018) Options Desktop Microphone MD-Ing_ (D1000039) Hand Microphone MH-Iyg _ (D1000040) Relay Box FRB-757 (D3000328) Microcomputer Interface Units (Apple 1) FIF-65 (IEEE RS-232C bus) FIF-232C_(D3000307) (3000280) Standard Power Supply FP-700 Fully Automatic Antenna Tuner FC-757AT Remote Antenna Selector (use w/FC-757AT) FAS-14R External Speaker SP-102 Phone Patch Speaker SP-102P Monoband V/UHF Transverter FTV-700 6m Module for FTV-700 FTV-6m 2m Module for FTV-700 FTV-2m 70cm Module for FTV-700 —- FTV-70em Connection Cable for Full Break-in Linear Amplifier 19101295SEMICONDUCTORS ICs Transistors Varactor diodes AN6551 1 2SA733AP 6 1svso AN6552 3 28A733AQ 9 1sv103 HD105S1P 2 2SA952L 1 (GX) FCS2M-S MB3713 1 2SA1012Y 2 FCS3M-5 MC3359 1 28A1193K 2 MC14011B 4 28C380TMY 23, Zener diodes MC14013B 1 28C4S8B 26 HZ3C1 MC14028B 1 28C458D 3 HZ4B3 MC14042B 1 28C496Y 1 HZSCI MCI4049UB 28C535B 17 RDS.1EB MC14066B 2 28C19230 1 RDS.1EB2 MC14071B 1 28C1971 1 (Gx) RD6.2EB3. MC14082B 1 28C2166 1 (8X) RD7.SEB3 MC14510B 1 28€2395 2(GX) RD8.2EB3 MC14518B 1 28C2509 2(SX) RD9.1EB2 MC14584B 1 28C2879 2(GX) RD9.1EB3 MC145145 2 28D8800 1Gx) RD30EB2 MC146805G2P— 2SD882Q 1 (SX) (SC82072P) 2SD892R 2 LED SN16913P 3 2N4427 2 LN410YP SN7ALSI4SN SN76514N 3 Germanium diodes Ring Modules TMS1751C 1 1N270 4 ND487R1-3R T™MS2370 1 ND487C2-3R TL7705 1(GX) Silicon diodes HPCTBLOS 2 Isiss4 1 Varistor diodes HPC78LO8 1 (SX) 181555 44 MVII HPC7808H 1 (SX) Issss 1 MVI2 uPC7808H 2(GX) 1oD10 4 (GX) MV103 MA190 B FETs FcD 28K107-3, 5 Schottky barrier diodes FIP9ET 28K125 7 18897 16 2SKI92AGR 2 1ssio1 1 28K241GR 1 188106 HW 3SK73GR 7 wean