Marconi Instruments TF 995A/5 Operating And Maintenance Handbook Download

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Summary of Contents for TF 995A/5

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Page 2: ...ING AND F M jA M MAINTENANCE HANDBOOK No OM 995A 5 Signal Generator TYPE TF 995A 5 Seriai Nos JA311 001 and above MARCONI INSTRUMENTS LTD ST ALBANS HERTS ENGLAND c P 4c 6 62jB Copyrighl 196 1 OM 995A S 1 1 6 1 ...

Page 3: ...s only 18 2 6 3 Outputs from 0 1 fJ V to 10 mV at 52 and 75 ohms 18 2 6 4 Output in terms of voltage developed across externalload 19 2 6 5 Matching to externalloads other than 52 or 75 ohms 19 2 6 6 Matching to balanced loads 21 2 7 SYNCHRONIZING SIGNAL 21 3 OPERATIONAL SUMMARY 22 4 TECHNICAL DESCRIPTION 23 4 1 R F CIRCUITS 23 4 2 MODULATION SYSTEMS 24 4 3 MONITORING ARRANGEMENTS 24 4 4 POWER UNI...

Page 4: ...quency High Deviation ExternaI F M Metering Accuracy Internai A M Externai A M Spurious F M on C W COMPONENT LAYOUT ILLUSTRATIONS GENERAL UNDERSIDE VIEW FROM REAR CASE REMOVED L F AND R F UNITS TOP VIEW R F UNIT GENERAL UNDERSIDE VIEW R F UNIT CLOSE UP OF PORTION OF UNDERSIDE L F UNIT UNDERSIDE VIEW ATTENUATORS COVERS REMOVED POWER UNIT SPARES ORDERING SCHEDULE CIRCUIT DIAGRAMS R F and L F Units P...

Page 5: ... controls are provided one stepped the other continuously variable The stepped controI enables the carrier frequency to be shifted by 20 and 10 kc on bands I and 3 lO and 5 kels on band 2 and 40 and 20 kc s on bands 4 and 5 The eominuous controI has a eover of 0 75 of one increment of the stepped controi on any band e g eover is 15 on bands 4 and 5 Built in coarse and line 75 ohm attenuators conne...

Page 6: ...th respeet to I kels The spurious f m due to hum does not exeeed 25 e s deviation at any carrier frequeney The unusually low level of spurious noise modulation allows full use of the Generator for adjaeent ehannel testing on receivers designed for systems employing ehannel separations as small as 22 5 kels Available internally at 400 e s 1000 eis and 1500 e s to a deptll variable up to 60 50 with ...

Page 7: ...S2 A Silicon Diode Two Type CGI E Germanium Diodes Fuses Two 2 amp Belling Lee Type O cartridge fuses for 200 to 250 volt operation For 100 to I50 volt operation the 2 amp fuses are replaced by a similar type having a rating of 3 amps One I50 mA Beswick Type TDCll Surge Resisting cartridge fuse 2 One Terminating Unit Type TM 5551 75 ohms in 52 and 75 ohms out 3 Two Coaxial Free Plugs Type BNC one ...

Page 8: ...s gives a stepped adjust ment while the other allows continuous inter polation between steps On the two highest bands the stepped controi provides shifts of 20 and 40 kc s in either direction and the calibration marks on the continuous controi are only 1 kc s apart on the lower bands the total shift is determined by a simple division of the reading on both diais A high degree of frequency stabilit...

Page 9: ... 3 frequencies from internai oscillator 5 Incremental Frequency Controls 14 Set Mod Controi Carrier shift is given by dial readings multiplied by factor Adjusts f m deviation or a m depth on Range switch 15 Interrupts Output without switching off filaments 6 Fine Tuning Controi 16 Output Attenuators 7 Range Selector Direct reading in source e m f at output of Terminating 8 Main Tuning Dial Unit wh...

Page 10: ... free socket the lead is stowed in the right hand case handle recess The TERMINATING UNIT which will normally be plugged on to the output lead has two outlets one of 75 ohms impedance and the other of 52 ohms Two free plugs are supplied for making connection to the TERMINATING UNIT outlets The 20 dB ATTENUATOR PAD available as an optional accessory can be inserted between the Generator output sock...

Page 11: ...t its angular position relative to that of the dial is variable over a small are by move ment of a milled boss at the centre of the dia This movable cursor enables the operator to __ ___ 50 0HM FREE PLUG UG 88 U L _ _ _ _ Cables RG 5S U RG S8jU standardize the frequency scale of the Signal Generator at any time the cursor is used in con junction with the crystal calibrator in the malmer described ...

Page 12: ...range of frequencies and it is inconvenient to OM 99SA S SECTION 2 reset the cursor for each material frequency change or altematively when using the 1 5 to 13 5 Mc s band the procedure is varied to reduce the mean error to a minimum The method of standardizing the frequency scale for subsequent general use is as follows l Set the INC FREQ controis to zero and the FINE TUNE controI to mid position...

Page 13: ...es between two crystal check point5 To do this proceed as follows Set the 1 FREQ controis to zero 2 Set the RA GE switch to whichever of the four higher frequency bands indudes the required frequency 3 Tune the Signal Generator to the nearest crystal check point helOlI the required frequency as indicated on the 111ain tuning dial identifying the point with the aid of headphones plugged into the CR...

Page 14: ...4 250 72 000 2 250 69 divisions 32 5 32 5 Since it will be appreciated that only typieal figures eould be quoted above il folIow that the relation5hip between frequency change and change E lION 2 in inlerpolating dial setting should be determined in the manner outlined above for the particular TF 995A5 in use 2 S SETTING UP FOR C W OR MODULATED OUTPUT The Signal Generator will gi c the following t...

Page 15: ...quency oscillator I Set the MOD SELECTOR switch to INT MOD A M 2 Turn the SET MOD FREQ switch to give the required modulation frequency 400 1 000 or 1 500 e s 3 Adjust the SET CARRIER controi to bring the meter pointer to the SET R F mark 4 With the METER READS key switch held in the A M position adjust the SET MOD controi to the required modulation depth as indicated on the top scale of the panel...

Page 16: ...oxi mately 15 volts r m s is required at the EXT MOD and E terminals to produce 30 modu lation depth within the modulation frequency range 100 c s to 10 kc s 5 Release the METER READS key switch and if necessary repeat 2 above 2 8 2 5 3 FREQUENCY MODULATION In addition to the MOD SELECTOR switch there are three other controls concerned in setting up the carrier deviation when the output from the S...

Page 17: ...110 RA il s itch a reqllired If at carrier frequeneies ks than 13 5 Mcs or greater than 27 S Mc s more than 15 ke s deviation is required set the DE IATlO I i 10 5 15 2 10 2 O 4 20 4 60 8 40 II 120 NOR 1ALHIGH switch to HIGH Deviations greater than 15 kc s are not obtainable on the 13 5 to 27 S Mc s carrier freqlleney band the maximum deviations obtainable on the other carrier rrequency bands are ...

Page 18: ... ECTION 2 yellow and in white the markings being in decibels relative to I J V the white markings are directly in units of voltage Ten 2 dB stcps givc the fine or MUI TlPI Y BY altenuator a total range of 20 dB each setting of the attenllator controI has markings in yellow and white the ycllow markings being in terms of deci bels relative to l V and the white markings multiplying factors for the w...

Page 19: ...V AT 75 OHMS ONLY With the TERMINATING UNIT detached and with the meter at the SET R F mark the output level 4048 10dB 3 1 IOOpV O obtained directly from the plug at the end of the r f output cable is variable in the range 2 fLV to 200 mVand is derived via a source impedance of 75 ohms Under these conditions the open circuit level or source e m f in terms of decibels relative to l fLV is obtained ...

Page 20: ... obtained from a source impedance of either 52 or 75 ohms If the equivalent under test has an input impe dance of other than 52 or 75 ohms and if it is required to present the equipment with a signal derived from a matched source then it is necessary to modify the output arrangements of the Signal Generator The simple modifieations required are described in sub sections a and b which follow OM 99S...

Page 21: ... adjustment of the SH CARR1ER eontroI to bring the meter pointer lo an eSlimated 0 3 dB As a result of shunting the output of the TER MINATlNG LNIT with 32 5 ohms and setting the attenuator eontrols in the manner deseribed the equipment under test is fed from a souree whose effeetive output impedance is 20 ohms and whose effeetive souree e m f is 25 J V the actual voltage developed Kross the input...

Page 22: ...where ZLB the tOlal line to line impedance of the balanced winding OM 99SAiS 1 1 61 ZU BALANC C lCA Zo the source impedance of the Signal Generator at the TERMINATING UNIT outlet in use With the eq uipment under test and the TER MI ATI G LNIT of the Signal Generator inter connected via Rj and R as described above the source e m f Esc indicated by the Signal Gener ator controis is equal to the effe...

Page 23: ... frequency on SET MOD FREQ switch adjust SET CARRIER to bring meter pointer to SET R F With METER READS switch at A M adjust SET MOD to bring meter pointer to required modulation depth Release METER READS switch and if necessary readjust SET CARRIER adjust step attenuators to obtain required output level External As for internal except that MOD SELECTOR switch is set to EXT MOD A M SET MOD FREQ sw...

Page 24: ...motion worm and wheel drive is incor porated this controi is fitted with a dial marked linearly from Oto 100 to assist the operator in sub diat In addition there is a fine tuning control Fine tuning is achieved by varying the reactor screen supply voltage The frequency coverage on the highest frequency band is approximately 24 kc s and proportionately less on the lower bands A carrier on off switc...

Page 25: ...mal deviation ranges on all carrier bands are O to 5 kc s and Oto IS kc s By means of the DEVIATION switch SS the switched potentiometer system can be by passed thus enabling the deviation 24 to be increased proportionally with increase in fre quency muItiplication and perrnitting a maximum deviation on the highest frequency band of 15 x 8 120kc s On the 1 5 to 13 5 Mc s band the maximum deviation...

Page 26: ...eR 140V 1105 V 240V 205V IIOOV 200V OV IIOV 300 a 240 volt Connections 2 Extract the eight screws from around the edge of the front panel 3 Pull the instrument clear of its case and dis connect the six way interconnecting cable from the power unit chassis 4 Detach the screw from the inside of the case which holds the cleating plate for the r f output cable to the right hand side pocket S After rem...

Page 27: ...Remove the front panel controi knob after slackening the two grub screws which secure it to its associated spindie 3 Detach the main body of the attenuator from the front panel by extracting five screws three of these screws are visible on removal of the controi knob as in 2 above the two remaining screws are located immediately above the 8 dB and 12 dB panel markings With the attenuator thus deta...

Page 28: ...PLI and chassis 260 volts d c lunction of R117 R118 and chassis 85 volts d c lunction of LI6 LI7 and chassis 280 volts d c Cathode of V11 and chassis 295 volts d c Table 4 lists certain valve electrode voltages in the TF 995A 5 When checking the instrument against these vohages the MOD SELECTOR switch should be set to INT MOD A M the RANGE switch uniess otherwise specified should be set to 108 220...

Page 29: ... may be used as a guide to suitable alternatives British British Type Base U S Commercial Services Equivalent Equivalent Equivalent 6AK6 Power Pentode B7G 6AK6 CVI762 V2 V4 V6 V8 VIO VU V3 VS 6AK5 H F Pentode EF86 Pentode 6AU6 Pentode B7G 6AK5 CV850 EF95 6267 CV2901 B9A 2729 CV2524 6AU6 CV4023 B7G EF94 V7 V13 12AT7 Double Triode B9A i2AT7 CV455 ECC81 V9 OA2 OA2 Voltage 150C2 CVI832 OA2 Stabilizer ...

Page 30: ...hoice ofvalue for individually selected components It will be appreciated that it may sometimes be necessary to reselect a selected component even though that component itself has not been found faulty and replaced in initial servicing operations To take an example the internai modulation oscillator is tuned to 1 000 c s by T1 and C6 In manufacture C6 is selected to give an oscillator frequency of...

Page 31: ... incorporate facilities allowing its loeal oscillator to be brought under erystal contro 30 5 8 2 INSULATION Apparatus required Item a Test the insulation between each pin of the supply plug and chassis with SKTl engaged with PLI This reading should not normally be less than 40 MO 5 8 3 H U M LEVEL Apparatus required Item c Measure the 100 c s hum level at HTl using a Wave Analyser isolated from t...

Page 32: ...e through two holes slightly larger than the ventilation holes in the top of the r f unit cover OM SAlS 1 1161 SECTION 5 Connect the output of the Signal Generator to a receiver and tune the receiver to some convenient accurately known frequency between 1 5 and 13 5 Mc s Set the main dial of the TF 995A 5 to this fre quency and adjust C40 for maximum receiver response In the absence of any other f...

Page 33: ...viation reading Set the 32 METER READS key switch S3 to C W and adjust the SET MOD potentiometer R25 to obtain 15 kc s deviation as indicated on the deviation monitor Depress the METER READS switch to F M Ifnecessary adjust RI24 to maintain a 15 kc s deviation reading with the METER READS switch in this position Return the METER READS switch to C W and set the DEVIATION RANGE switch to 5 kc s If n...

Page 34: ...ercentage variation in true deviation and the percentage variation in input volts required from the value at 1 000 c s to maintain the internai meter constant The sum of these two variations at any one a f is not likely to exceed lO 1o OM 995A S 5 8 15 INTERNAL A M Apparatus required ltems g and I Apply the output of the TF 995AIS to a fre quency changer circuit which is followed by an Lf ampIifie...

Page 35: ...25 c s f m will give a leve1 40 dB below that for 2 5 kc s Switch to c w on the MOD SElECTOR switch and with the output leve adjusted to the SET R F mark check at carrier frequencies of 90 and 216 Mc s that there is negligible frequency modulation of the signal the spurious deviation is not likely to exceed 25 c s OM SA S 34 1 1161 ...

Page 36: ... R70 SKTI CI4 MAINS FILTER L24 L25 C84 to C87 and S4 ATTENUATORS For details see Fig 6 6 R24 concealed C8 C9 and R38 R F UNIT L F UNIT For details see Figs 6 2 6 3 and 6 4 For details see Figs 6 2 and 6 5 2 1 GENERAL UNDERSIDE VIEW FROM REAR CASE REMOVED OM 99SA S Fig 6 1 1 61 ...

Page 37: ...C64 vlO C 6 C 4 C S vI2 cal C80 V 4 a3 RII RS vI3 RI24 CI02 I VS R R2 CIoI fe f i C 105 r CSI RI14 __1 v3 do T2 X3 308 La C98 R163 C42 C2 C99 X4 L F AND R F UNITS lTOP VIEW WITH R F UNlT SCREENING COVER REMOVED OM 995A S Fig 6 2 6 62 ...

Page 38: ...R23 R6 C93 C30 SS C46 C26 cia 7 CI3 L2 cs L3 C23 L7 RI07 m o II Yl V2 For details see Fig 6 4 RI9 R31 C38 V6 R29 R33 213 R F UNIT GENERAL UNDERSIDE VIEW OM 995A 5 Fig 6 3 1 1161 ...

Page 39: ...C94 R3S R36 R37 T5 R58 R62 R59 C73 C6S C95 L6 C7S L23 L26 and LI9 R45 V8 C67 OM 995AfS 1 1 61 r R42 RIII C50 C78 R40 R F UNIT CLOSE UP OF PORTION OF UNDERSIDE Fig 6 4 ...

Page 40: ...R49 R44 CS3 C91 JI CI RSO SI2 RI V9 TI CI6 RIO R4 concealed VI C97 C96 RI66 RI26 RI65 vs RI24 RI09 RI23 C37 R34 R2S L F UNIT I UNDERSIDE VIEW OM 995A 5 1 1 61 Fig 6 5 ...

Page 41: ... ATTENUATOR R71 C89 C90 COARSE AITENUATOR R83 to R99 R73 to R82 2 6 SCREENING COVER SCREENING COVER FOR FINE ATTENUATOR R70 RI21 FOR COARSE ATTENUATOR ATTENDATORS COVERS REMOVED OM 99SA S 1 1 161 Fig 6 6 J ...

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Page 44: ... tW 4 TM4800 2 2 R2 Composition 1 5 kO tW 58 TM4826 5 3 R3 Composition 220 kO 10 tW 18 TM4800j2 4 R4 Composition 270 kO 10 l W 5 TM4800 2 5 R5 Composition 27 kO l W 5 TM4706 6 R6 Composition 2 2 kO tW 59 TM4826 5 7 R7 Wire wound Variable 50 kO 10 3W 18 TM4831 2 8 R8 Composition 4 7 kO 10 tW 146 TM4826 5 9 R9 Composition 5 1 kO tW 7 TM4706 10 RIO Composition 10 kO 10 tW 6 TM4800 2 11 Rll Compositio...

Page 45: ... 47 kO IOW Composition 15 Hl 10 iW Composition 6 8 kO 10 iW Composition 2 2 kO 10 iW Composition 10 kO 10 lW Wire wound Variable 200 kO 200 kO Composition 68 kO 10 tW Composition 6 8 ko 10 tW Composition 2 2 kO 10 iW Wire wound 4 kO 5 7W Composition 100 kO tW Composition 4 7 kO 10 tW Composition 2700 10 iW Composition 6 8 kO 10 tW Composition 68 kO 10 iW Composition 47 kO 20 tW includes L2J Compos...

Page 46: ...R76 Carbon High Stability 742Q 1 W 35 TM4297A 74 R77 Carbon High Stability 742Q 1 iW 35 TM4297A 75 R78 Carbon High Stability 220Q 1 iW 38 TM4297A 76 R79 Carbon High Stability 91 6Q 1 kW 37 TM4297A 77 R80 Carbon High Stability 91 6Q 1 iW 37 TM4297A 78 R81 Carbon High Stability 91 6n 1 AW 37 TM4297A 79 R82 Carbon High Stability 82 5n 1 kW 36 TM4297A 80 R83 Carbon High Stability 17 9n 1 i W 24 TM4298...

Page 47: ...06 RllO Composition 1000 10 lW Part of Item 266 10 TM39OO 52 107 RIll Composition 10 kO 10 lW 57 TM4826 5 108 R112 Wire wound Variable 20 kO 10 2W 81 TF995Aj5 109 RI13 Composition 68 kO 10 W 23 TM4800j2 110 RI14 Composition 100 kO 10 W 145 TM4826j5 111 R1l5 Composition 1 kO 10 lW I47 TM4826 5 112 R1l6 Composition 3300 iW 60 TM4826 5 113 R1l7 Composition 2 2 kO 10 lW 36 TM4299 2 114 RI18 Compositio...

Page 48: ...omposition lO kO 1 l W 121 TF995Aj5 Carbon High Stability 10 kO 1 iW 121 TF995A 5 Carbon High Stability 10 kil 1 iW 121 TF995A 5 Carbon High Stability 10 kO 1 W 121 TF995A 5 Carbon High Stability 10 kO 1 W 121 TF995Aj5 Wire wound Variable 25 kil 3W 116 TF995A 5 Composition 56 kO W 122 TF995A 5 Composition 100 kil 10 lW 137 TF995A 5 Composition 470il 10 W 63 TF995A 5 Composition 10 kO 10 l W 136 TF...

Page 49: ... 400 V d c Paper 0 1 11 F 20 350 V d c Paper 0 1 fLF 20 350 V d c Mica Special Assembly 100 fLfLF Nominal Ceramic 0 01 11 F 20 Ceramic 0 001 Il F 20 400 V d c Inc1uded in Item 247 Mica Special Assembly 100 fLfLF Nominal Inc1uded in Item 247 Mica 100 fLfLF 10 350 V d c Paper 0 001 20 600 V d c Mica 39 fLfLF 5 750 V d c Paper 0 1 fLF 20 350 V d c Paper 0 001 fLF 20 600 V d c Paper 0 01 fLF 20 350 V ...

Page 50: ... L LF part of Item 174 Air Trimrner 2 8 L LF part of Item 174 Ceramic 100 L LF 0 100 soo V d c Ceramic 22 L LF 20 500 V d c Ceramic 47 L LF 20 500 V d c Mica 100 L LF 10 350 V d c Mica Special Assembly 100 L LF Nominal Electrolytic 8 LF 20 50 150 V d c Paper 0 1 LF 25 250 V d c Ceramic 33 fL LF 20 500 V d c Mica 100 LfLF 10 350 V d c Mica Special Assembly 100 L LF Nominal Electrolytic 8 LF 20 50 4...

Page 51: ... Ll7 H T Smoothing Choke 256 Ll8 Multiplier Tuning Inductor 27 55 Mc s 257 Ll9 R F Inductor part of Item 59 258 L21 R F Inductor part of Item 53 259 L22 Multiplier Tuning Inductor 54 110 Mc s 260 L23 Multiplier Tuning Inductor 108 220 Mc s 261 L24 R F Inductor mains filter 262 L25 R F Inductor mains filter 263 L26 Filter Inductor TRANSFORMERS 264 Tt A F Oscillator Transformer 265 T2 Master Oscilla...

Page 52: ...er Toggle 2 pole 2 position Rotary 2 pole 3 position 2 wafer TC4428 344 1l7 TF995A 5 TB23903 2 118 TF995A 5 278 279 280 VI VALVES VALVE HOLDERS AND RETAINERS 6AK6 Pentode Holder for VI Retainer for VI 47 TF995A 5 TB26904 2 PC17501 2 281 282 283 V2 6AK5 Pentode Holder for V2 Retainer for V2 101 TM4826 5 TB26904 2 PC17501 2 284 285 286 V3 EF86 Pentode Holder for V3 Retainer for V3 163 TM4826 5 TB269...

Page 53: ...r for VW 5Z4G Full Wave Rectifier Holder for VII Retainer for VII 6AK5 Pentode Holder for V12 Retainer for Vl2 12AT7 Double Triode Holder for V13 Retainer for VB 5651 Voltage Stabilizer Holder for V14 Retainer for V14 6AL5 Double Diode Holder for V15 Retainer for V15 103 TM4826 5 TB26905 2 PCl7502 2 WI TM4826 5 TB26904 PC17502 2 48 TF995A 5 TB26904 2 PC17501 2 WI TM4826 5 TB26904 PC17501 1 16 TM42...

Page 54: ...s only Holder for cartridge fuses METER 0 100 LA Moving Coil including clamping braekets PLUGS SOCKETS AND CONNECTING LEADS Plug 6 way Socket 6 way Mains Lead comprising 6 ft 3 core Flexible Cable and 3 pin plug complete with Plastic Entry Sleeve 750 Type BNC Socket coaxial free 750 Type BNC Socket coaxial fixed 500 Type BNC Socket coaxial fixed 750 Type BNC Plug modified coaxial fixed KF Output C...

Page 55: ...bly to fit in Item 350 353 Nylon Drive Cord 354 Knob for SET MOD FREQ switch S12 355 Knob for MOD SELECTOR switch SI 356 Knob for RANGE MCjS switch S2 357 Knob for DEVIATION NORMAL HIGH switch S5 358 Knob for DEVIATION RANGE switch S6 359 Knob for OUTPUT VOLTAGE attenuator 360 Knob for MULTIPLY BY attenuator 361 Knob for SET CARRIER control R44 362 Knob for SET MOD control R25 _ TB29569 TB4691A 18...

Page 56: ...nuator Assembly includes Items 68 to 79 inclusive 223 224 225 326 and 327 2 dB Step Attenuator Assembly inc1udes Items 80 to 96 inclusive 20 dB ATTENUATOR PAD includes Hems 97 to 99 inclusive and Hems 298 and 300 52 and 75 ohm TERMINATING UNIT inc1udes Hems 100 to 102 inc1usive and Hems 337 to 339 inclusive R F Unit Screening Cover Contact Spring for earthing R F Unit Screening Cover Set of three ...

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Page 58: ...1995 03981 1778 03162 DECIBELS O 1 2 3 4 5 6 7 8 9 1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 2 8 3 0 3 5 4 0 4 5 5 0 5 5 6 7 8 9 10 II 12 13 14 IS Ratio Up VOLTAGE POWER 1 0 1 012 1 023 1 035 1 047 1 059 1 0 1 023 1 047 1 072 1 096 1 122 1 072 1 084 1 096 1 109 1 122 1 148 1 175 1 202 1 230 1 259 1 148 1 175 1 202 1 230 1 259 1 318 1 380 1 445 1 514 1 585 1 288 1 318 1 349 1 380 1 413 1 660 1 738 1 820 ...

Page 59: ...X 10 4 10 4 3 162 X 10 7 10 7 3 162 X 10 8 10 8 3 162 X 10 9 10 9 10 10 10 11 10 12 10 13 10 1 DECI8ELS 16 17 18 19 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 65 70 75 80 85 90 100 110 120 130 140 VOLTAGE 6 310 7 079 7 943 8 913 10 000 12 59 15 85 19 95 25 12 31 62 39 81 50 12 63 10 79 43 100 00 125 9 158 5 199 5 251 2 316 2 398 1 501 2 631 0 794 3 1 000 1 n8 3 162 5 623 10 000...

Page 60: ... 2 0 O C63 _ I R91 1 I 17 9 I I 01 I 1 2 2 C94 R90 I I 120p 17 9 I R42 1 R89 RS8 17 0 17 1 I ____ I R126 1 FINE r III I RI67 I I I I 20dB i TO ATTENUATOR 1 I ATTENUATOR I CIS I 01 C9 J I 100 C96 i I I I 220 I I I 1 I T I I T I I RIOI 1 _________ _ _____________________________ J S YNC E or L __ _ _ 9_____ I 00 TERt 1INATING UNrT r I 1 I 3 6 SI2 AIOO OOO 500 SET t 10D FREQ cw INT trAOD AM M UT t tO...

Page 61: ...I klO I I L _ _ _ I T MAINS INPUT FILTER ov lOV OJ r I C92 I r I I o ts I I 10 II 11 60 11 159 10 lOk II csa 11 122 I n II INCREMENTAL II FREQUENCY II CONTROLS SIO II COARSE INe All 11 11 11 120 I J I FREQ 3 7 HIt C n n NOTES I COHPONENT VALUES Rai tor No suffix ohms k kilohms M mez ohms Capacitor No suffix microfan ds p picofarads Value seleeted durin factory tettin nominal value shown 1 VOLTAGES...

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Marconi Instruments TF 995A/5, Operating And Maintenance Handbook

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