Lafayette STARFLITE KT-390 Assembly Manual Download | Manualshive

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Summary of Contents for STARFLITE KT-390

Page 1: ...FR D2O assembly manual STARFLITE 90 WATT TRANSMITTER ...

Page 2: ... voltage of Y2 and thus controls the output drive which is coupled to the prid of the final amplifier through capacitor C1z FINAL AMPLIFIER Final amplifier tube V3 operates straight through on all bands as a shunt fed neutralized amplifier The tank circuit is made up of C20 FINAL TUNING Lé4 or portions thereof selected by Band Switch SW 2b and C22 FINAL LOADING C22 consists of three 450 ppf parall...

Page 3: ... KEYING ry ollowing way With the key plug inserted and in the key up position a high bias voltage several times the normal grid bias is placed on the grids of tubes V1 VZ and V3 This cuts these tubes off and there is no transmitter output eving ig achievedi Keying af GOT YOU Li In the key down position R S is shorted removing the high bias voltage from VI and 2 Also the bias voltage to V3 is reduc...

Page 4: ...ter crystals 10 meters 40 meter crystals Pin spacing 0 486 Pin size 093 dia NOVICE OPERATION Novice operation is restricted to the following frequencies BAND FREQUENCY ALLOCATION 80 meters 3700 3750KC 40 meters 7150 7200KC 15 meters 21 100 21 250KC Novice power input is limited to 75 watts In the operating instructions the final amplifier is loaded to 120 ma for novice operation as opposed to 150 ...

Page 5: ... the METER switch to Grid Set the MODE switch to Tune Adjuet DRIVE TUNE for maximum grid reading on the meter Adjust DRIVE LEVEL for 2 5 ma grid current Change METER switch to the Plate position Set MODE switch to AM Adjust FINAL TUNING for minimum plate current reading dip Set MODE switch to CW mall steps adjusting the FINAL TUNING for mi munimum pla fa currant fdin 4 fter each ston 120 ma for NO...

Page 6: ...pair haye been found defective due to poox solder connections Therefore any doubtful connections should be re heated to make gure they are correctly soldered BD Check for small piecea of solder or wire which may have fallen into the chassis Make sure that the use of excess solder has not caused a short between adjacent terminals or nearby wiring par ticularly on tube sockets and switch terminala E...

Page 7: ...AL LOADING 0 005 pf 500V 20 ceramic disc 0 001 pf 500y 10 ceramic disc 50 ppf S00V 10 ceramic disc 100 ppf 500V 10 N750 ceramic disc 470 ppf 500V 10 ceramic disc 68 pf 3KV 10 ceramic disc 0 002 pf 500V 10 may be marked 2000 47 pi 300V 10 molded mica 180 ppt 300V 10 molded mica 0 001 pf 2000V 20 molded mica marked 12 202 120 pp 1500V 20 molded mica marked 12 203 0 005 pf 400V 20 molded paper 0 01 p...

Page 8: ...1ZAX7 tube 6DE7 tube Silicon diode marked 1723 Silicon diode marked 1724 SHEET METAL PARTS Cover plate Shield bracket Shield bracket Crystal socket bracket Final amplifier shield rear Final amplifier shield front Center shield Low pass filter housing Escutcheon Cover Bottom plate Chassis MISCELLANEOUS O Ll ima meter Tube shield Tube shield Ceramic plate cap Ceramic standoff terminal Pitot light so...

Page 9: ...51 6 32 x 7 16 spade lug 8 20 100 Double solder lug z 22 106 Solder lug 4 22 141 Thumbscrew 8 32 x 1 2 1 20 83 8 solder lug 1 22 156 6 32 x 1 4 spade lug 2 WIRE AND SLEEVING 21 15 22 Black lead 24 21 11 22 Yellow lead 60 21 69 fee Gray lead 561 21 25 22 Red White lead 198 21 13 22 White lead TZ 21 14 22 Blue lead 69 21 87 18 Yellow lead 60 21 86 20 Bare wire 4g 21 18 Yellow cotton varnished sleevi...

Page 10: ...s 1 2 watt brown black yellow silver 33K ohms 1 2 watt orange orange orange silver 10K vlims 1 2 wait brown biack orange silver 4 7K ohma 1 2 watt yellow viclet red silver 18K ohms 1 watt brown gray orange silver 470K ohms 1 2 watt yellow violet yellow silyer 47K ohms 1 2 watt yellow violet orange silver 2 2 megohm 1 2 watt red red preen silver 33K ohms 1 watt orange orange orange silvyer 1 5 mego...

Page 11: ...al 80 40 20 15 and 10 meters CRYSTAL or external VFO METER switch MODE switch DRIVE LEVEL CRYSTAL switch DRIVE TUNE BAND switch FINAL TUNING FINAL LOADING L 6CL6 Crystal Oscillator 1 6CL46 Driver 1L L2AX7 ECC83 Speech Amplifier 1 6DE7 Modulator 1 6146 Final Amplifier 117 volts 50 60 cycles AC 225 watts Width 13 1 8 Depth 12 incl knobs Height 6 1 4 incl rubber feet 28 lbs ANY OBLIGATION TO INCORPOR...

Page 12: ...RAMIC DISC CAPACITOR MOLDED FEED THROUGH MOLDED MICA ELECTROLYTIC GAPACITOR TUBULAR CAPACITOR CAPACITOR CAPACITOR COILS AND CHOKES i o 7 Wa Lop op DRIVER PLATE COIL OSCILLATOR COIL RF CHOKE 23 33 23 32 23 37 LOW PASS FILTER COILS _ _ am _fi i PARASITIC CHOKE 23 40 23 41 23 42 RF CHOKE 23 43 23 38 20 74 20 305 20 314 20 47 29 313 20 312 ...

Page 13: ...2 26 Chae Say as o era foDemanaa 4 x 1 4 8 x 3 8 8 x 3 8 6 32 x 1 4 6 32 x 7 16 S M SCREW 5 M SCREW S M SCREW SPADE LUG SPADE LUG 22 116 22 152 22 93 22 156 22 151 SOLDER LUG 22 106 oa ai 6 SOLDER LUG 20 24 8 SOLDER LUG 20 83 DOUBLE SOLDER LUG 20 100 TUBE SHIELD 20 304 20 173 2 SHAFT COUPLER POTENTIOMETER 11 58 NOVAL SOCKET OCTAL SOCKET 49 30 19 46 CERAMIC STANDOFF STANDOFF TERMINAL INSULATORS 20 ...

Page 14: ...ds connected to this lug at the tirne it ia soldered NOTES ON WIRING Each kit is supplied with more than enough insulated lead for complete wiring A length of insulated lead unless otherwise specified should have about 1 4 of inswlation removed or stripped from each end Excessive wire exposure increases the possibility of shorts to nearby wiring or terminals Use a razor blade or sharp knife to cut...

Page 15: ... must be heated sufficiently to melt solder before the solder will flow smoothly and freely in and around the connection however you must be careful not to apply heat too long Excessive heat from the iron may damage components and insulation on wires connected to the joint When soldering a joint having a small cornponent connected to it a 1 2 watt resistor for example the cormponent may be protect...

Page 16: ...to the large cut out for the power transformer Use 4 40 hardware 1 Mount a 3 lug terminal poat 20 314 to the right of VZ socket using 4 40 hardware ly Care fully observe the position in which the post is installed be sure to use the wight mounting bole in the chassia Mount a 3 lug terminal post 20 305 near V2 socket as shown using 4 40 hardware 1 Mount a 5 lug terminal post 20 313 to the left of V...

Page 17: ... POST 20 22 es Oo o o TERMINAL POST p 20 3 TERMINAL POST a TERMINAL POST i 20 3133 a 120 314 oO TER Al POST OSCiL ATOR ELECTROUYTE CAPACITOR re 20 305 i re 2 193 POWER TRANSFORMER 8 43 PICTORIAL 1 REFER TO PICTORIAL 2 22 _ Select the following parts Two Stand off Insulatore 20 309 Two Dual Solder Luge 20 100 Two Cork Washers 22 140 Four 8 32 x 1 4 Screws Four 8 Lockwashers One 8 Solder Lug ...

Page 18: ...e tightly frorn the underside of the chassis by means of the special 5 16 t nut When tight cuing the nut make sure you do not damage the ceramic portion of the capacitor ceramic material cracks quite easily REFER TO PICTORIAL 2 28 29 bo 30 31 04 32 33 t Mount the RF choke 23 39 and cork washer 22 140 as shown using a 6 32 x 1 4 screw and 5 lockwasher Weave the screw fairly loose in order to permit...

Page 19: ...By Install the oacillator coil 23 32 in the hole near V1 To install press the coil firmly into place allowing the spring tabs to snap open on the other side of the chassis Be sure to orient the coil with the terminal lugs in the positions shown the terminal with a red dot located at the left 3 8 NUT a a FINAL AMPLIFIER SHIELD FRONT SECTION a r 10 147 capacitor Og S iz 98 oP e a2 x 1 4 cero SCREW 1...

Page 20: ...7 lug 4 NS 42 Connect the FELLOW transformer lead to J 1 lug 7 5 1 43 Connect the BLUE transformer lead to TP 2 lug 3 NS 44 4 Connect both the GREEN YELLOW and BLUE YELLOW transformer leads to TP 2 lug 2 5 2 45 4 At socket V4 bend lugs 4 5 and 8 against the center post as shown 46 Cut a 2 length of BLACK lead Connect it from TP 9 lug 5 NS to the center post of V4 socket NS 47 Cut a 1 3 4 length of...

Page 21: ...mounting lugs of C36 to the chassis Use sufficient heat and solder to ensure a good electrical connection to the chassis in each case s Cut a 15 length of GRAY Iead Connect it from TP 1 lug 2 S 2 to SW 3 lug 10 S 1 Dress the lead as shown Make sure lug 10 of the awitch is kept well away from the chassis Cut a 9 1 4 length of GRAY lead Connect it from TP 1 lug 3 NS to F 1 lug 2 8 1 Cut a 9 length o...

Page 22: ...gs 1 and 7 against the center post Connect a short length of bare wire from SL 3 NS through V2 lug 4 to the center post NS Solder V2 lug 4 5 1 Cuta 9 length of YELLOW lead Connect it from V2 lug 5 NS to V1 lug 5 NS Connect a 0 005 pi 20 ceramic disc capacitor C37 from V1 lug 5 5 3 to SL 2 S 2 When installing the capacitor keep the leads as short as possible Connect a 0 005 pf 20 ceramic disc capac...

Page 23: ...watt resistor brown black orange silver R to 1 2 Connect it from TP 5 lug 4 NS to TP 5 lug 3 S 2 Cut each lead of a 4 7K ohm 1 2 wait resistor yellow violet red silver R9 to 3 4 Slip a 1 2 length of sleeving over each lead Connect it from TP 5 lug 1 NS to TP 5 lug 4 5 3 E RF choke 23 38 L 4 to 7 8 Slip a 1 2 length of sleeving over 2 Ng 5 N f x Lao f aug 2 N Cut each lead of a 0 005 pf 20 ceramic ...

Page 24: ... 1 4 of insulation from one end but tthe other strip off 1 2 Passe the 1 2 end through V5 lug 2 NS and connect to lug 3 NS Connect the other end of the lead to V5 lug 6 S 1 Solder V5 lug 2 5 1 Keep the lead away from the center post of the socket as shown 108 ae Cut each lead of a 1 5 megohm 1 2 watt resistor brown green green silver R23 to 1 2 Connect it from V5 lug 1 NS to V5 lug 3 5 2 TOPCHASSI...

Page 25: ... T VINOL3Id 2 2 1 No aBa 2 i o i ...

Page 26: ... the coil on the rear wafer SW 2aj allowing each tab to pags through a corresponding switch lug as shown Position the coil so that it accupies 2 central position on the wafer and leave coil taba full length temporarily Make sure the distance between the end of the coil and the bracket does not exceed 2 11 16 as indicated Solder lugs 12 11 10 and 9 of switch SW 2a Cut off surplus wire from these te...

Page 27: ...ssembly aa shown and then carefully insert the shaft into the slot in the rear wafer Allow a portion of the shaft to enter the coil as shown 129 Ne Lower the shield bracket with attached switch assembly inte place on the underside of the main chassis Do not attempt to secure the bracket with hardware yet Place a 3 8 lock wacher over the shaft of the front wafer assembly kuch end then guide the sha...

Page 28: ...e hole in the front shield Secure the bushing io the shield by ITG caI s ot the hex nui 138 WN On the underside of the chassis install a 6 lockwasher and 6 32 hex nut on each stud at holes H and I The nuts should be finger tight only 139 j Fasten the rear shield to the front shield by means of four 8 x 3 8 sheet metal screws 140 On the underside of the chassis install the 1 lug terminal post on th...

Page 29: ...LOADING CAPACITOR 12 155 vg or SPLIT LOCK WASHER 6 32 8 44 rn SPADE LUG 22 1361 FINAL AMPLIF ER SHIELD REAR SECTION id 1484 PICTORIAL 6 DRIVE TUNE CAPACITOR 12 197 eye FIGURE 4 ...

Page 30: ...lead coming from TP 9 lug 3 to TP 12 lug 1 NS 152 A Cut a 11 1 4 length of GRAY lead Connect it from TP 2 lug 1 S 2 to SW 3 lug 1 S 1 153 Cut a 8 length of GRAY lead Connect it from TP 8 lug 3 NS to S5W 3 lug 2 8 1 154 Cut one lead of a 4 7K ohm 1 2 watt resistor yellow violet red silver R15 to 1 1 4it Slip a 1 length of yellow sleeving over this lead and connect it to TP 9 lug 2 5 3 Leave the oth...

Page 31: ...lug 1 5 4 to TP 3 lug 3 fNsi jase C3 Gut each lead of a 12K ohm 2 watt resistor brown red orange silver R26 to 3 4 Pass one lead through SW 3 lug 6 and solder S 1 Connect the other lead ta TP 12 lug 1 NS Cut each lead of a 6 8K ohm 2 watt resistor blue gray red silver R6 ta 3 4 Connect it from R5 lug 1 S 1 to TP 12 lug i S 5 4 Cut a 5 1 2 length of RED lead 22 wire with heavy insulation Connect it...

Page 32: ...on DF asec am sees tl 4 2 wire with heavy insulation Connect one end ts ena to _ a 4 lug 2 NS Pass the free end through grommet hole A and leave temporarily Hsconnected Cutan 8 3 4 length of WHITE lead Connect it from TP 4 lug 1 NS to TP 3 lug 4 NS Dress exactly as shown Cut a 19 length of BLUE lead Connect one end to TP 5 lug 2 NS Rowte the lead as shown and pass the free end through grommet hole...

Page 33: ...ched beneath the bracket Install the CRYSTAL switch on the bracket using a 3 8 lockwasher and 3 8 hex nut to se cure the switch Make sure the locating lug on the face of the switch enters the small hole provided for it in the bracket Rotate the shaft of the crystal switch to its fully counter clockwise position when viewed from the shaft end Temporarily place the main chassis to one side LOW PASS ...

Page 34: ...d with the two stand off terminals securing them from the underside with the lockwashers and tx nuts Be sure to mount the 6 solder lug under stand off BB 195 wh Connect a 180 puf 10 molded mica capacitor G42 between stand off GC NS and the 6 solder lug NS Keep leads short 196 Gonnect a 180 auf 10 molded mica capacitor C41 between mano NS and the 6 solder lug S 2 Keep leads short 197 BQ Select L9 a...

Page 35: ...re from the housing through the hole in the final amplifier shield and then guide the housing forward and then downward allowing the studs to enter into the corresponding holes in the chassis Secure the housing from the underside of the chassis by means of four 6 Lockwashers and four 6 32 hex nuts Cut a 3 1 4 length of yellow sleeving Slip it aver the bare wire making sure the sleeving pushed as f...

Page 36: ...g 0 8 1 to TP 3 lug 3 NS co 210 Slip a 1 2 length of gleeving over the free end of Gl and connect to Vii lug 3 8 1 211 A Cut a 6 length of YELLOW lead Connect it from SW 1 lug 6 S 1 to J 2 lug 1 S 1 212 A Cut a 2 3 4 length of YELLOW lead Connect it from SWw 1 lug 12 8 1 to V1 lug 2 S 1 4 3 Cuta 1 1 2 length of bare wire Connect it from X5 lug A S 1 to Sw 1 lug 5 S 1 i g 214 MN Cut a 1 1 2 length ...

Page 37: ...g 9 5 1 222 Connect a short length of bare wire between J 1 lug 1 5 1 and J 1 lug G3 S 1 223 Cut a 2 1 2 length of WHITE lead Connect it from J i lug 8 S lj to TP 3 lug 4 5 5 224 Select the four diodes D 2 D 3 D 4 0 5 marked 1723 Cut the leads of each diode to 1 in length 225 Connect D5 from TP 7 lug 1 NS to TP 8 lug 4 NS Orient as shown 226 ON Connect D4 from TP 7 lug 1 5 2 to TP 8 lug 3 NS Orien...

Page 38: ...e red lead to 1 5 8 and the negative black lead to 1 3 4 Connect the positive lead to TP 13 lug 1 5 3 and the negative lead to C36 lug A S 3 Position as shown Select another 30 yf 450 volt electrolytic capacitor 12 194 C35 Cut the negative black lead to 1 3 8 and the positive red lead to 1 5 8 Connect the positive leadto TP 13 lug 2 S 5 and the negative lead to C36 lug B S 4 Dress as shown NOTE Ma...

Page 39: ...s 1 2 and 3 of variable capacitor C42 Next twist each lug approximately 45 degrees Locate the heavy bare wire coming from Pl lug 2 Pass the free end of this wire through lugs 1 2 and 3 of C22 Remove surplus wire at lug 3 and then solder ali lugs Select the parasitic choke 23 43 and ceramic cap 20 290 Cut one lead of the choke to 5 8 and pass this end into the lug within the ceramic capas shown Sol...

Page 40: ...fiber washers and ground lug Install the connector as shown using a 3 8 lockwasher and the hex nut just removed 243 Stand the chassis on edge power transformer closest to the work surface and referring to Detail A of Pictorial 10 locate the Crystal switch Make sure the switch is in the fully counter clockwise position when viewed from the shaft end Slip the end of the long 1 4 diameter shaft 22 15...

Page 41: ...e other end is connected to TP 8 lug to SW 4 lug 3 S 1 249 0 Connect the free end of the blue lead SW 4 lug 1 8 1 250 Cut a 2 3 4 length of BLACK lead At one end strip off the normal 1 4 of insulation At the other strip off 3 4 of insulation Pass the bare wire at this end through lug 4 of SW 4 and connect to L 5 Solder at SL 5 and lug 4 of SW 4 Leave the other end of the lead temporarily disconnec...

Page 42: ... the meter CAUTION Use care when passing wire through the meter lugs They are fairly soft and will not stand tao much abuse Now slip a 3 4 length of yellow sleeving over the bare wire and connect it to SW 4 lug 5 8 1 Pass the other lead of C17 through lug 1 of the meter and after cutting off surplus wire crimp ii to this lug N65 254 N Select a 2 2K chm 1 2 watt resistor red red red silver R12 Cut ...

Page 43: ...nated position Secure each knob with the set screw 261 Rotate the shaft of the DRIVE TUNE capacitor until the plates are fully meshed Inatall a small knob on the shaft with the indicating arrow at position 1 Secure with the set screw in the knob 262 WN Rotate the shaft of the FINAL TUNING capacitor until the plates are fully meshed Install a 9 large skirted knob 18 69 on the shaft with the indicat...

Page 44: ......

Page 45: ...L TOPCHASSS VIEW ...

Page 46: ...ystal preferably 80 meter in crystal socket 1 COAX CONNECTOR 4 N Set FINAL TUNING control and BAND switch to the panel marking for the band being used ini I eir maximom counter clock SOLDER wise positions place DRIVE TUNE at WARNING WHEN POWER IS APPLIED LETHAL VOLTAGES ARE PRESENT BOTH ABOVE AND BELOW THE TRANSMITTER CHASSIS KEEP HANDS AWAY FROM HIGH VOLTAGE POINTS AND USE ONLY WELL INSULATED TOO...

Page 47: ...torial 11 until the meter peaks at the point to which the transmitter was loaded on CW 19 thy Retur 20 Now repeat steps 4 through 17 with the Band awitch in the 40 20 15 and 10 meter positions The use of a 40 meter crystal is recommended for these bands The audio level control R21 will not require further adjustment Use 1 cryatal socket for the 40 meter erystal 21 Q Set BAND switch to 10 meters an...

Page 48: ...the neutralizing stub for a minimum reading on the RF indicator by moving the stub closer to or further away from the final amplifier tube Readjust FINAL i TUNING for a peak indication again then reposition the neutralizing stub for minimum RF indication When you have properly neutralized the final amplifier rotation of the FINAL TUNING capacitor will cause very little variation in the RF indicato...

Page 49: ... eee fe at ui is i COVER COVER PLATE Z seen Pr EMa fete rey rh eit SS Cais eee 5x2 hy sth BX a a SHEET METAL SCREW os 224152 s 2 118 renee ath neialt pe st BOTTOM PLATE RUEBER FOOT SCREW Ss 2 42 x3 SHEET METAL SCREW 22 93 PICTORIAL 13 Pi 3 ...

Page 50: ... in off position 50K 0 30K Depends 35K G on Level 33K Position Yok 10 ohms i 0 600K 2 2M 0 0 15M 22M 9 33K Méasurements taken with YIYM and made from chassis to point indicated y2 6CL6 124 150 3 6146 LOO axx nee y4 12AX7 140 0 1 35 0 i 80 5 6 6 3 4C V5 6BE7 620 20 20a 0 6 3 AC 20 8 0 120 Yarias with crystal activity Do not attempt 6146 Plate Cap Voltage Measurement Voltage varies with Modulation t...

Page 51: ...MB So f f Sw 3b 7 IZAX7 7 OE Fe Di ee 7 47 ream 002 UF Etces 7 is cae MODE a 3 i 8 4 casres RI7 R20 C27 R22 R24 2629 R25 C30 4 22 470 22 33K S 100 Jol S 08 wo e SOK NEG am S uur vec Iw WF aw UF R26 1 ao e dl aw g b Sue beeen ee ee ee ee eS aa eee Oe ae oer cur sev C33b tour OV a FO POWER oy Sams re so ew NOTES ci roe ALL RESISTORS 1 2 WATT UNLESS OTHERWISE Ol oe os o 4 os cs4 C36 ig 30ur 30UF a SP...

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