Marconi TF 144H Series Operating And Maintenance Handbook Download Page 65

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Summary of Contents for TF 144H Series

Page 1: ...TF 144H series II Standard Signal Generator IE s a JaS 7t7 1 LL MARCONI INSTRUMENTS LIMITED ST ALBANS HERTFORDSHIRE ENGLAND...

Page 2: ...ENERATOR A modified tag strip has been fitted to the a 1 c and modulation amplifier This has involved the relocation of some components A drawing of the new arrangement is given below this replaces fi...

Page 3: ...DBOOK No OM 144H II for Standard Signal Generator TF I44H Ser es II Types TF 144H 4 TF 144H 4R TF 144H 4S and TF 144H 6S Copyright 0 1963 MARCONI INSTRUMENTS LTD ST ALBANS HERTFORDSHIRE ENGLAND C P 3...

Page 4: ...14 Direct Output 17 3 TECHNICAL DESCRIPTION 19 3 1 Circuit Summary 19 3 2 R F Oscillator 19 3 3 Range Switching 20 3 4 Main Tuning 21 3 5 Incremental Tuning 21 3 6 Modulation Oscillator and Cathode Fo...

Page 5: ...provided which is operative above 80 kc s and enables incremental frequency adjustments to be made with complete freedom from backlash up to 0 5 of the frequency in use Modulation can be applied from...

Page 6: ...m up OUTPUT Impedance Calibrated Output Direct Output 50 0 at calibrated output v s w r better than 1 25 1 2 p V to 2 V e m f Low outputs down to 0 2 V using 20 dB Pad TM 5573 Normal approximately 2V...

Page 7: ...2 Mc s 1 kc s 5 kc s 20 kc s 20 kc s 20 kc s 400 c s 2 kc s 14 kc s 17 kc s 20 kc s 200 c s 1 kc s 8 kc s 15 kc s 20 kc s Input requirements approximately 6 volts into 25 1 2 for 80 modulation Less th...

Page 8: ...For battery operation connect up the special battery lead Type TM 6122 available as an optional accessory If the instrument is to be used in a vehicle use a separate 1 t battery or alternatively check...

Page 9: ...ing Lee L788FP plug 5 ft long Joint Service Ref No 5995 99 580 0512 6 20 dB PAD Type TM 5573 50 ohms BNC plug BNC socket Joint Service Ref No 5905 99 580 0510 7 MATCHING PAD Type TM 5569 50 to 75 ohms...

Page 10: ...and frequency of range sel ected is shown in the window PHONES JACK Insertion of telephone plug with Function Selector set to CRYSTAL CHECK switches on crystal calibrator 0 lA O 0 0 Set Cursor Control...

Page 11: ...witching off carrier without affecting output impedance or stability COARSE ATTENUATOR 11 steps of 10 dB Figures in window show Black dB relative to 1 V to be added to figure on dial Red or Green Volt...

Page 12: ...kc s against the upper cursor Set the function selector to one of the C W positions Bring the meter pointer to the SET CARRIER mark by adjusting the SET CARRIER control and note that the control is wi...

Page 13: ...FINE TUNING control to 0 For maximum accuracy switch to CRYSTAL CHECK and plug headphones into the PHONES jack Readjust the main tuning control for zero beat at the nearest crystal check point see Se...

Page 14: ...multiples of 2 Mc s The actual frequencies are tabulated below TABLE 2 1 CRYSTAL CHECK POINT FREQUENCIES Range A Range B Range C Range D Range E Range F 10 20 20 40 40 80 80 200 200 535 535 1605 kc s...

Page 15: ...RANGE D 500 400 300 80 100 120 140 160 180 200 Frequency kc s 0 T4 1 3 5 1 1 to 0 9 0 7 RANGE E 220 260 300 340 380 420 460 500 Frequency kc s 600 800 1000 1200 1400 Frequency kc s RANGE G 3 kc s per...

Page 16: ...the SET MOD control to bring the meter pointer from the SET CARRIER mark to the SET MOD mark Switch to EXT MOD USE and set the MOD control to indicate the required percentage modulation on its dial O...

Page 17: ...cul ated load voltage obtained from Table 2 2 Standing waves produced by the mismatched load can for most purposes be ignored TABLE 2 2 LOAD ohms To find load voltage Multiply or Subtract E M F by dB...

Page 18: ...m load a Matching Pad Type TM 5569 or TM 6599 is available as an accessory and consists basic ally of a 25 ohm resistor with coaxial con nectors for insertion in series with the output lead MATCHING T...

Page 19: ...RL 10 Ro RL When matching to loads other than 50 ohms the matching resistor must be inserted on the output side of the Pad the expressions given in Section 2 11 then become E For series matching VI 2...

Page 20: ...2 If for any reason the impedance of the load is lower than these fig ures add a series resistor between the DIR ECT OUTPUT and the cable to bring the ef fective impedance seen by the generator up to...

Page 21: ...s applied direct to the HIGH OUTPUT socket and also to the R F OUTPUT socket via the coarse and fine attenuators The oscillator output is also applied to the thermo couple meter for carrier level moni...

Page 22: ...Oscillator Range G Ranges D to K are basically similar the cathode of V102a On ranges A to H this potential is limited by the series resis tors R110 R108 R185 and the neon tube V104 on ranges I J and...

Page 23: ...and capacitor 0214 in series with C215 by means of switch section S 200 Bh Level stabilizing negative feedback is applied to the cathode of V204a from the anode of V204b via the thermistor TH2O1 posit...

Page 24: ...lying the resultant d c to the grid of V102b where it is compared with the refer ence potential set up across R115 For any change in r f output a difference voltage appears at the anode of V102b and h...

Page 25: ...tray coupling for mixing to take place in V103b Switch section S 200 Bd breaks the h t supply to the crystal calibrator circuit in all positions other than CRYSTAL CHECK 3 9 CRYSTAL CALIBRATOR AMPLIFI...

Page 26: ...output In the NORMAL position of the switch the output e m f is the same as at the R F OUTPUT socket with both attenuators out of circuit When SI00c is turned to HIGH RV 104 is connected in series wi...

Page 27: ...oltage drop due to the resistance of the winding being negligible The same front panel switch S 200 A is used for both main and battery operation The fuse FS201 protects the rectified h t supply only...

Page 28: ...please indicate clearly the nature of ie fault or the work you require to be done 4 2 MAINS INPUT ARRANGEMENT The Generator is fitted with a mains transformer which has a double wound prim ary windin...

Page 29: ...0 10 05 120 100 IIII o 0 1 10 105 1 120 100 0 Section 4 SUPPLY VOLTAGE PANEL Masking plate and links must be positioned according to supply voltage as shown 200 250 volts a c 100 130 volts a c SUPPLY...

Page 30: ...V 204 L T regulator VT 201 VT 203 H T regulator V201 V203 Crystals XT101 XT102 Section 4 A L C and R F oscillator Crystal calibrator modulation amplifier V101 V103 I V102 I In screw on heat dissipatin...

Page 31: ...ine Attenuator assembly 1 Slacken the set screw in the fine atten uator knob 2 Remove the four fixing screws of the R F OUTPUT socket 3 Remove the six fixing screws from the attenuator housing inside...

Page 32: ...0 kc s 82 V 25 V 7 mA B 20 kc s 82V 24V 6 65 mA 40 kc s 75 V 20 V 5 9 mA C 40 kc s 86V 29V 7 2 mA 80 kci s 86 V 30 V s 7 05 mA D 80 kc s 86 V 28 V 8 mA 200 kc s 80 V 24 V 7 45 mA E 200 kc s 76V 18V 6...

Page 33: ...HOLE MR104 I 0 R 192 7 C157 MR103 RIO MR101 7 C 104 NMI MR102 MIM R104 1111 PakIRICO O 0 40 Akio R191 4 5 6 02 RV 103 10 o C124 Section 4 Fig 4 5 A L C Fig 4 4 Coil turret Mod Amp tagstrip Fig 4 6 Mo...

Page 34: ...5 R106 R112 R109 C110 V102 R115 C192 R121 R118 R119 V101 R185 L101 C 144 R120 R187 RV102 S100A See Fig 4 5 Turret detent spring Fine attenuator Coarse attenuator Monel earthing gasket For mechanical a...

Page 35: ...is valve is also the modulation oscillator When a valve is replaced it is advisable to use the same type as the original fitted in the instrument this is normally but not necessarily the type listed i...

Page 36: ...are given on the back cover Circuit Ref Function RV103 RV104 RV 201 RV202 L114 L115 L116 L117 L119 L121 L123 L125 L127 L129 L131 L133 L118 L120 L122 L124 L126 L128 L130 L132 L134 C 144 C152 C155 C158...

Page 37: ...Vary supply voltage 6 check h t variation within 0 5 V 1 t varia tion within 0 05V H T L T check V201 low emission MR201 to MR210 check VT201 VT202 MR205 2 LEVEL MONITOR 2A c connect 2 0 V to RANGE c...

Page 38: ...15 R210 R211 emitter base VT 201 VT 202 emitter base collector Note This chassis is at VT 201 collector potential MR202 MR201 MR207 MR203 MR208 MR210 MR209 MR204 C201 C202 Section 4 Fig 4 7 H T Rectif...

Page 39: ...C 0 27k 025 2200p S200Bg S200Bh QS MODULATION 0 TI 0 ISM FLT2 6 3ro c 0201 MODULATION CATHODE FOLLOWER C214 8227 2200p 120k 120 220 105 100 200 MR201 MR203 HTI FS202 7U 2A SKT202 6 t 5 r rol LINE c SK...

Page 40: ...1 C217 I R231 I R203 hidden I j R229 below R208 R212 V201 R202 C207 C208 C211 R223 I R221 R224 C209 I V202 V203 0 oJ Section 4 C214 R205 R217 R216 R226 R220 R225 V204 R218 R209 t TO lir R R F box tags...

Page 41: ...coocloocso SIO0A1 R104 50 SET HIGH OUTPUT CID4 R171 ALC 100k itAk C129 0 01 MODULATION C160 200p 1 SICOOBA SIOOBe at MR102 HD1870 HDI870 SET METER RVIO3 FINE ATTENUATOR R102 R103 lk lk RI07 114 0 R152...

Page 42: ...rk Adjust RV101 slightly Repeat Ref 2C Turning RV101 too far clockwise may burn out thermocouple TC 102 Adjust RV104 3 CRYSTAL CALIBRATOR 3A Frequency d couple to crystal circuit by looping wire round...

Page 43: ...C152 C155 C184 4B Fine Tuning d connect to R F OUTPUT Select C W main tuning to mid scale On ranges D to L in turn check FINE TUN ING control cover and accuracy If total cover wrong adjust appropriat...

Page 44: ...k a f voltage across RV203 is 15 V 10 Check V204 V202 C210 5C Ext Mod Bandwidth f h connect oscil lator via attenuator to EXT MOD terminals Set oscillator to 1000 c s 10 V attenuator to 10 dB e connec...

Page 45: ...ing W at 55 C Works Ref FIXED RESISTORS 1 R100 Carbon filament 50 S2 2 1 4 10 TM 6714 1 2 R101 Deposited carbon 100 162 10 1 4 7 TM 6714 1 3 R102 1 AZ 10 1 4 8 TM 6714 1 4 R103 II 1 IQ 10 1 4 8 TM 671...

Page 46: ...5990 31 R130 96 259 1 1 8 36 TM 5990 32 R131 142 352 1 1 8 37 TM 5990 33 R132 96 25S 2 1 1 8 36 TM 5990 34 R133 142 3 S 2 1 1 8 37 TM 5990 35 R134 96 259 1 1 8 36 TM 5990 36 R135 142 3 0 1 1 8 37 TM 5...

Page 47: ...92 2 1 8 18 TM 5991 65 R164 f 332 2 1 8 17 TM 5991 66 R165 272 2 1 8 15 TM 5991 67 R166 242 2 1 8 14 TM 5991 68 R167 Deposited carbon 100 10 10 1 4 5 TM 6715 69 R168 22 10 10 1 4 23 TM 6086 70 R169 4...

Page 48: ...52 10 1 2 68 TM 5993A 1 97 R196 100 S2 10 1 2 24 TM 6086 97 1 R197 Carbon filament 1 kS2 10 1 2 25 TM 6086 97 2 R198 150 0 10 1 2 11 TM 6714 1 98 R201 Composition 100 10 1 2 10 TM 6083 99 R202 Deposit...

Page 49: ...ament 120 112 2 1 2 17 TM 6084 125 R228 120 162 2 1 2 17 TM 6084 126 R229 Deposited carbon 470 112 10 1 4 20 TM 6084 127 R230 2 2 112 10 1 4 9 TM 6084 128 R231 2 7142 10 1 4 10 TM 6084 129 R232 2 2112...

Page 50: ...h 4 700 pF Min 350 17 TM 5992 51 C114 4 700 pF Min 350 17 TM 5992 52 C115 Ceramic 4 700 pF Min 500 18 TM 5992 53 C116 Electrolytic 1 F 20 275 16 TM 6715 54 C117 Lead through 4 700 pF Min 350 17 TM 599...

Page 51: ...I 270 pF 10 500 29 TM 6712 1 180 C144 Trimmer 2 19 pF 500 V pk 32 TM 6712 1 180 la C145 Ceramic 470 pF 10 500 26361 031 182 C146 I 4 7 pF 10 750 36 TM 5991 183 C147 10 pF 10 750 37 TM 5991 184 C148 1...

Page 52: ...pF 500 V Pk 12 TM 6144 8 210 C177 Ceramic 82 pF 5 750 31 TM 6086 211 C178 220 pF 40 20 500 8 TM 6144 9 212a C179 Trimmer 4 20 5 pF 500 V pk 12 TM 6144 9 213 C180 Ceramic 100 pF 5 750 33 TM 6086 214 C1...

Page 53: ...2 F 50 20 450 41 TM 6084 235 C207 Ceramic 0 01 p F 10 350 36 TM 6084 236 C208 0 01 IF 10 350 36 TM 6084 237 C209 Paper 0 1 F 20 250 37 TM 6084 238 C210 Electrolytic 1 F 20 275 39 TM 6084 239 C211 Cera...

Page 54: ...A Tuning Coil 12 TM 6144 262 L115 Range B 20 TM 6144 1 263 L116 Range C 21 TM 6144 2 264 L117 Range D 22 TM 6144 3 265 L118 Filter Coil 23 TM 6144 3 266 L119 Range E Tuning Coil 15 TM 6144 4 267 L120...

Page 55: ...sket to fit under V101 can TB 38141 286 V102 Triode pentode type 6U8 ECF82 46 TM 6712 1 287 B9A holder for V102 with screw on screening can 35 TM 6712 1 288 Earthing gasket to fit under V102 can TB 38...

Page 56: ...B7G 56 TM 6084 301 Retainer for V203 59 TM 6084 302 V204 Triode pentode type 6U8 ECF82 76 TM 6084 303 Holder for V204 type B9A 57 TM 6084 304 Retainer for V204 58 TM 6084 CRYSTALS HOLDERS SCREENING C...

Page 57: ...UCTOR DIODES 316 317 318 319 MR101 MR102 MR103 MR104 Gold bonded type HD 1870 I I I 16 TM 6714 16 TM 6714 16 TM 6714 16 TM 6714 320 MR201 Silicon type XU 604 1N 540 32 TM 6083 321 MR202 32 TM 6083 322...

Page 58: ...3 PLP201 Pilot Lamp 6 3 V 0 15 A 68 TF 144H 4 334 Lamp holder with bezel and lens TB 5073 FUSES HOLDERS 335 FS201 336 337 FS202 338 H T fuse 500 mA Fuse holder for FS201 Mains fuse 2 A Fuse holder for...

Page 59: ...TP201 EXT MOD terminal 112 TF 144H 4 352 TP202 E terminal 71 TF 144H 4 SWITCHES 353 S 100 A Wafer switch FREQ RANGE 354 S 100 B Wafer switch OUTPUT E M F fine 354 1 S 100 C Wafer switch DIRECT OUTPUT...

Page 60: ...369 Knob TB 17848 13 370 Chain drive 87 TM 5993A 1 Output E M F Controls 371 Dial TB 31042 372 Cursor TB 25273 1 373 Knob for fine attenuator TB 23920 9 374 Knob for coarse attenuator TB 17848 4 375...

Page 61: ...1 t regulator TB 25002 146 chassis 388 Insulating washer for 1 t regulator chassis TB 2706 153 screws 389 Instrument case for TF 144H 4 H 4S H 6S TE 26860 1 390 Front panel surround for TF 144H 4 TC...

Page 62: ...lative to chassis except where otherwise indicated Voltmeter 20 14 V model on highest convenient range X switched to CRYSTAL CHECK M switched to any MOD position 3 SYMBOLS a preset component arrow ind...

Page 63: ...C 0 27k 025 2200p S200Bg S200Bh QS MODULATION 0 TI 0 ISM FLT2 6 3ro c 0201 MODULATION CATHODE FOLLOWER C214 8227 2200p 120k 120 220 105 100 200 MR201 MR203 HTI FS202 7U 2A SKT202 6 t 5 r rol LINE c SK...

Page 64: ...0173 4 20 5p RI77 4 7k C172 1000p I 4 _4 205p 3 C158 4 20 5 p 5 6 L 117 7 K 5180 3 9k C181 470p 6 5 3 2 C180 Op 5173 4 7k 3 C163 1000p CI6 4 20 5p 103 10p 41 130 4 20 5 p 8179 4 714 CI78 220p E C166...

Page 65: ...t where otherwise indicated Voltmeter 20 14 2 V model on highest convenient range A Range A with meter at SET CARRIER A F Ranges A F G L Ranges G L 3 SYMBOLS preset component arrow indicates clockwise...

Page 66: ...coocloocso SIO0A1 R104 50 SET HIGH OUTPUT CID4 R171 ALC 100k itAk C129 0 01 MODULATION C160 200p 1 SICOOBA SIOOBe at MR102 HD1870 HDI870 SET METER RVIO3 FINE ATTENUATOR R102 R103 lk lk RI07 114 0 R152...

Page 67: ...6918 1 6 1 202 1 445 8128 6607 1 8 1 230 1 514 7943 6310 2 0 1 259 1 585 7762 6026 2 2 1 288 1 660 7586 5754 2 4 1 318 1 738 7413 5495 2 6 1 349 1 820 7244 5248 2 8 1 380 1 905 7079 5012 3 0 1 413 1...

Page 68: ...x 104 3 981 x 10 3 1 585 x 10 5 48 251 2 6 310 x 104 3 162 x 10 3 1 000 x 10 s 50 316 2 1 000 x 10 2 512 x 10 3 6 310 x 10 6 52 398 1 1 585 x 10 1 995 x 10 3 3 981 x 10 6 54 501 2 2 512 x 105 1 585 x...

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