Yaesu FC-757AT Instruction Manual Download

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Summary of Contents for FC-757AT

Page 1: ......

Page 2: ... ser digitalizado por PY2TKI Marcos Digitalizado em 24 de Novembro de 2020 por Alexandre Tabajara Souza PU2SEX http www tabalabs com br http tabajara labs blogspot com MANUAL DE DISTRIBUIÇÃO GRATUITA Respeite o meu esforço de preservar a documentacao ...

Page 3: ...ansmitter better than 1 5 1 for impedances in that range Manual matching is also possible for particularly difficult situations or when matching for receiving only Two antenna jacks are provided along with controls for remote automatic and manual selection of up to five antennas in total when the FC 757AT is used with the optional FAS l 4R Remote Antenna Selector An internal 50 ohm dummy load is i...

Page 4: ...MY LOAD Impedance son Power dissipation 1OOW CW less than 30 sec POWER REQUIREMENTS Supply voltage 13 SV DC 10 Current 300 mA max 400 mA w FAS 1 4R Size W 238 x H 94 x D 241 mm Weight Approximately 3 7 kg Specifications subject to change without notice or obligation Supplied Accessories Connection Cable A T9100160A SD 2V Coax w type M connectors Connection Cable B T9015099 Control Cable C for FT 7...

Page 5: ...nding to the amount of RF power applied from the transmitter if at least 10 15 watts CV SENSitivity Control This potentiometer adjusts the SWR threshold level at which the automatic tuning system automatical ly starts and stops its tuning procedure If the SWR of the antenna system is close to 1 5 1 this control should be set fully clockwise for maximum sensitivity to SWR However if the SWR is high...

Page 6: ...o high Manual restart caused by pressing this button can be used to force the auto tune system to retune at any time BAND MANUAL DOWN and UP Buttons The two position MANUAL button enables the DOWN and UP keys for manual band changing when depressed the band to which the Tuner is set to operate is indicated by the ten LEDs above these buttons When used with a transceiver designed to control the FC ...

Page 7: ...ed auto matically by the internal circuitry and is therefore fairly independent of the actual RF power applied to the tuner by the transmitter as long as it is at least 10 15 watts j THRU Switch When set to the depressed position this switch bypasses the Tuner circuit from the RF line This can be used for receiving on frequencies that are outside of the matching range of the FC 757AT In the undepr...

Page 8: ...nsceiver via supplied interconnecting cable C When the FC 757 AT is used with a transceiver that is not designed for automatic band control DC power must be supplied to this connection via supplied DC power cable B Power requirements are 12 to l SV at 300 mA or 400 mA if the FAS l 4R is also used INPUT This type M coaxial jack is for connection to the antenna jack on the transceiver via supplied c...

Page 9: ...h conditions is not recom mended The FAS 1 4R is designed to allow remote selec tion of up to four additional antennas with only a single feedline and control cable from the FC 757AT to the FAS l 4R Once set the correct antenna for each band is selected automatically whenever the operating band is changed in the Tuner ACC 2 INTERCONNECTIONS Figures 1 through 4 on the following pages illustrate the...

Page 10: ... i ANT r ACC B I 2 l m D i r DC 13 5V CONNECTION CABLE C T9101292 CONNECTION CABLE A T9100160Al FIGURE 2 FC 757AT AND FT 980 FT 980 S G LIN AMP L 0 l oQ_o_o_CKJ_ oo _CKJ_o__ Q _Jll GND 0000 Q Q Q Q ACC 1 AC IJ foo o o o 0 W Q0 PTIONA ACCORO CABLE 04000014 CONNECTION CABLE A T 9100160A ANT A 8 FAS l 4R fre s1 l TB 2 0 INPUT 2 B 1 a i 1 B 4 TE 41 1 I o o B 3 ...

Page 11: ... 4 FC 757AT DODOO 0 0 OODDDDD BBBBBBB 0000000 0000000 0 DODOO fr ANT GND lJ J e m JJ J TE 2 41 1 Jl J 0 0 0 lll A B c GND WHITE RED BLUE BLACK INPU G f 1 f CONNECTION CABLE B T901 509 9 CONNECTION CABLE A T9100160A FAS 4R ANT A AND RECEIVER FRG 7700 ccooo CONNECT ION CABLE B T901 5099 CONNECTION CABLE A T9100160A 9 B 1 B 4 B 3 B 4 B 3 ...

Page 12: ...s with vacuum tube amplifiers When using a transceiver that has tubes in the final amplifier circuit such as the FT 902 FT lO lZD or FT 102 the final network in the transceiver must be tuned for a 50 ohm load before matching with the FC 757AT To do this press the DUMMY button on the Tuner and then key the transmitter and adjust the TUNE or PLATE and LOAD controls on the transceiver for 100 watts o...

Page 13: ...LOAD 1st 2nd 3rd 4th When using a transmitter on the amateur bands set the SENS control fully counterclockwise to disable the auto tune system and set the METER SWR PO switch to the PO undepressed position Now transmit a carrier while pressing the four TUNE and LOAD buttons one at a time while watching the PO meter indication for maximum deflection When this is obtained press the METER SWR PO swit...

Page 14: ...r each band is also automatically re selected when returning to that band The Tuner settings and selected antenna data are stored in RAM and retained by a lithium backup battery which is normally switched on at the factory Current drain is so small that the lithium battery should last at least five years if left on all the time However if it is necessary to store the FC 757AT for a long period of ...

Page 15: ...rs The wiring of the control cable is indicated in Table 1 3 Using the U bolt and Mast Clamp supplied mount the FAS l 4R on the tower or support mast mast diameter must be 37 6 4 mm or different hardware will be required 4 Mate the connectors one at a time with their jacks on the FAS 1 4R applying sealing compound around each mated fitting after the weather sleeve has been slid over the connector ...

Page 16: ...for repair at which time the necessary realignments will also be carried out Failures caused by unauthorized attempts at align ment are generally not covered by the warranty policy so any such attempts must be at the customer s own risk COUPLER UNIT TOP VIEW TUNER UNIT The following tools and equipment are required for alignment One 17 ohm non reactive dummy load or three 50 ohm dummy loads connec...

Page 17: ...er and adjust VR103 on the CPU Unit so that the power indications on both meters again agree at 10 watts SWR Meter Calibration The CM Coupler Balance and PO Meter alignment procedures must be performed before proceeding 1 Note the required settings on the transmitter to produce 10 watts and 100 watts output into 50 ohms and then replace the 50 ohm load with the 17 ohm dummy load TC301 VR103 VR104 ...

Page 18: ...l button and note the position of VC 201 when it again stops If this is not the point of maximum capacitance fully meshed plates loosen the shaft coupler and reposition VC 201 Then tighten the set screw again and repeat steps 4 and 5 6 Follow the same procedure as in steps 4 and 5 to adjust LOAD capacitor VC 202 using VR106 on the CPU Unit to set the point of minimum capacitance Backup Battery Rep...

Page 19: ...__ _J cpcp lJ oTC t101 0 __ _ _ I I r l b a e I I R03 3 lilk N Cl f O 0 l I 8 I g a e 8 Ur 0 II f i JI TI NE TOA w 4 L OAD J I f 8 I rii I I on REF 1 _ o _J a i tsir Hrt t _J IN 4 2 f ll ll 8 e 1 1 ti J C IN e G r C 1 tt H TT I I s11 soe o I J J J 0 1 SWITCH A I HIT s 2 50 9 soe 03 ru VRO 101 8 5EN5 L nm 1 c l I o I e1 _ Q Ot l I _ c l I J I e m I I 0 I I N g I I I o 8 8 8 t _________ _ _ _ _ _ _ ...

Page 20: ... II II II j SI st SI PEF FW I 11 tJ a l t r I DlETII r l 0 II 8 N QOS 2SC458B R34 100k I I 1 R35 t 100k 0 J W Q02 M 14016BCP g l OQQq TT ANT B 13 SV TV ER ON MOTOO PRESET o O N Q09 2SC4598 ill l I l h ll G PQt l sv j I R 2 m I I I CY H I I I I I I I I I I I I R 3 47k o T I m r I I I I I R0202 T l W WWCYC J Q20 uPA2004C Gfi O fil0 0 i t N II A11 l 11 R 5 R 7 R20 R93 R42 I I t 47k 47k 47k Ok J04 1 9...

Page 21: ...2SC458B 2SC2120Y INHIBIT 0126 I I 11V I 2SC496Y 31 38 t30 BAND DATA 27 29 23 26 PO PICKUP PO 0108 ANT A 0 0 ANT B ANT B RL DRIVE THRU nJNER ANT SELECT RL DRIVE Q21 22 23 2SA733AQ x3 REl OTE ANT SELECTOR QI 06 I THRU TUNER 2SC458B SWITCH 0 A Ol IT CMPTR IN INPl 1 1 BAND IN SELECT sv AVR I 012V CPU 0104 uPD7507C TUNE LOAD t OTORS P12 2 5 8 BAND t OTOR 10 THRU LEO ANT B CNTL SELECT 12 17 uPC78L05 012...

Page 22: ...550 GEAR R12I S1000006 SHAFT COUPLER Rl81 I88 189 VRl 2 J6080103 POTENTIOMETER SENSOR R156 165 166 171 MOl 2 M2190004 MOTOR 174 I77 B4101210 WORM GEAR RIO 108 111 124 R9500570 BAND GEAR ASSY 142 143 157 163 168 170 173 176 B3500560 GEAR 178 179 183 I85 M2190004 MOTOR I87 190 I92 B4101210 WORM GEAR R196 R910P20 GEAR Band SW R160 R150 S1000006 SHAFT COUPLER RI06 20 S4000027 FOOT REAR R3100700 FOOT F...

Page 23: ...D110F473Z50V C108 119 KlOl76102 B O OOlµF C201 K30275100 Dipped Mica 500WV lOpF DD104B102K50V LCQ11100J5 ClOl 105 107 K13179008 F O OlµF C202 K30275101 lOOpF 109 114 DD106F103Z50V LCQ1210lJ5 C106 120 121 K13179009 0 047µF C207 K30309026 lKWV 200pF DD110F473Z50V DML2 201110 Cl17 K40179013 Electrolytic 50WV lµF C208 K30309027 260pF 50RE1 DML2 26 1 110 C118 K40179009 2 2µF C209 K30309011 300pF 50RE2R...

Page 24: ... 106F103ZSOV 0 047µF DD 110F473ZSOV Dipped Mica SOOWV 430pF LCQ18431JS Electrolytic 35WV lOµF 35RE10 TRIMMER CAPACITOR ECV 1ZW10x40 lOpF INDUCTORS FLSH102K lmH RL301 Symbo l No R401 420 C401 QSOl DSOl 510 515 517 DSll 513 514 5 1 8 D51 6 D5 19 RSOl R502 515 R5 17 R5 1 6 R5 1 8 Symbol No D601 604 R601 22 RELAY Ml190026 MR 31 12V DUMMY LOAD UNIT Part No Description RESISTORS 122375102 Metallic film ...

Page 25: ...iption F2549000A Printed Circuit Board C025490A PCB with components DIODE 070 1 G209000 1 Si 100 1 CAPACITORS C70 1 702 K l 3 1 79008 Ceramic disc sowv O O lµF 00106F103Z50V SWI TCHES S701 N4090087 SOWlP S702 703 N4090086 SPHl ACCESSO RIES Symbol No Part No Description T91001 60A Connection Cable A T90 1 5099 Connection Cable B T9 1 0 1 292 Connection Cable C 23 ...

Page 26: ...M EMO 24 ...

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Page 28: ...YA E SU v E8420184AC8401 A ...

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