Racal Instruments 9081 Maintenance Manual Download Page 35

Page: 35 / 153

Summary of Contents for 9081

Page 2: ...RUMENTS S A 18 Avenue Dutartre 78150 Le Chesnay France Telephone 3 955 8888 TLX 697 215 RACAL DANA INSTRUMENTS GmbH Hermannstrasse 29 D 6078 Neu Isenburg Federal Republic of Germany Telephone 06102 28...

Page 3: ......

Page 4: ...hing 4 Pinch victim s nostrils 5 Take a deep breath 6 Cover the victim s mouth with yours and blow watching his chest rise Note Blow forcefully into adults but gently into children 7 Move your face aw...

Page 5: ...esistors Capacitors 20 2103 Delete 86 20 2223 Delete 87 Add new components 20 2123 Carbon Film 1 4 5 12 k R87 20 2332 Carbon Film 1 4 5 3 3k R86 20 1521 Carbon Film 0 1 5 Ik Ra 21 1512 Delete 6A T Add...

Page 6: ...the Pozidriv 1 type Phillips typeand Pozidriv type screwdrivers are not interchangeable and the use of the wrong screwdriver will cause damage POZIDRIV is a registered trade mark of G K N Screws and F...

Page 7: ...lACAlL modulation liequnncy frequency MHz...

Page 8: ......

Page 9: ...while that for Models 9082 and 9082H is 1 5 to 520 MHz b The frequency range for external AM is d c to 100 kHz for Models 9081 and 9081H and d c to 20 kHz for Models 9082 and 9082H 3 Models 908 WH and...

Page 10: ...UCTION 2 1 POWER SUPPLY AND FREQUENCY STANDARD 2 1 OPERATING 2 1 1 RF Tuning 2 1 Output Level Setting 2 2 Modulation Mode Selection 2 3 Multiple Modulation 2 3 Switching Off 2 3 DESCRIPTION OF CONTROL...

Page 11: ...DIVIDER AND PHASE DETECTOR ASSEMBLY 19 0846 4 6 Introduction 4 6 N Counter 4 7 Digit Blanking 4 7 HF Divider 4 8 Phase Detector 4 9 Read Only Memory ROM 4 10 Half Octave Output 4 11 End Stop Control 4...

Page 12: ...Shift Data 4 20 CIRCUIT DESCRIPTION 4 21 Carrier Input 4 21 Range 1 Select 4 21 Time Base Drive 4 21 Time Base Encoding and Delay 4 21 Trailing Digit Blanking 4 22 Leading Digit Blanking 4 22 Complet...

Page 13: ...AND DISTORTION CHECK 5 24 FM FREQUENCY RESPONSE CHECK 5 26 AM FREQUENCY RESPONSE CHECK 5 27 RECONNECTION OF HIGH LEVEL AMPLIFIER 5 28 LEVEL ACCURACY CHECK 5 28 DISTORTION CHECK 5 29 AM DEPTH AND DISTO...

Page 14: ...LAYOUTS AND CIRCUIT DIAGRAMS Chassis Layout Topside View Fig 1 Chassis Layout Underside View Fig 2 Parts List 1 Main Oscillator Assembly 19 0841 Component Layout Main Oscillator Assembly 1 9 0841 Fig...

Page 15: ...ssembly 19 0847 Fig 14 Circuit Audio Oscillator Assembly 19 0847 Fig 15 Parts List 8 Display Assembly 19 0848 Component Layout Circuit Display Assembly 19 0848 Fig 16 Parts List 9 1 20MHz Loop Assembl...

Page 16: ...SECTION 1 T_E_C H NJ CAL _S PEC 1FIQAI LQK...

Page 17: ...ents as follows 1 5 10 and 20 kHz 2 6 25 12 5 25 and 50 kHz 3 15 30 and 60 kHz The frequency increments in A f mode are given in Chapter 2 page 2 6 The output frequency is continuously measured and di...

Page 18: ...nics Sub Harmonically Related Signals Discrete Spurious 1 MHz 100 mV r m s 10V r m s 100V d c Approximately 1 kQ a c coupled At least 30 dB below carrier for frequencies between 5 and 520 MHz At least...

Page 19: ...minimum output level is 130 dBm into 5QQ 71nV 2 The stepped output level switch provides attenuation from OdB to 120dB 130dB for models 908 1H and 9082H in 1 OdB steps The switch is calibrated in dBm...

Page 20: ...se Power Protect Unit is fitted with not less than lOdB attenuation selected The output withstands reversed r f inputs up to 1W A protection unit giving protection up to 50W is available as an optiona...

Page 21: ...c up to 100kHz 9081 or 20kHz 9082 1 Up to 90 at a modulation frequency of 30kHz or less decreasing to 50 at 100kHz Adjustment internal source is by MODULATION LEVEL control 2 Using an external input 8...

Page 22: ...ntrol 3 Using an external input IV r m s into 60CQ gives 10 radians phase modulation Less than 5 at 100 radians using internal oscillator 5 of f s d Simultaneous modulation by AM and either FM or pM i...

Page 23: ...ional Accessories 1 Racal Dana Frequency Standard Type 9420M Frequency Ageing Rate Warm Up Time Temperature Stability 5MHz 5 parts in 10 per day after 3 months continous operation Better than 1 part i...

Page 24: ...SECTION 2 DESCRIPTION OPERATION _ MAINTENANCE...

Page 25: ...h the resolution is varied to suit the particular tuning mode Fast Slow or Hold in use 1 4 The Channel Spacing switch provides ten different frequency spacings which conform to the internationally agr...

Page 26: ...nel switches which provide four possible voltage selections and can be locked to the chosen positions by a screwed plate which allows the selected voltage range markings to be seen Refer to para 5 1 H...

Page 27: ...adjacent LED illuminates 4 Set the rear panel STANDARD switch to the required position according to whether internal or external frequency standard is to be used 5 From cold switch on the approximate...

Page 28: ...iable tuning between frequency increments Set the FINE TUNE lever switch to INT or to EXT if external fine tuning is to be used Check that the adjacent ON indicator illuminates To disconnect the FINE...

Page 29: ...ond to full scale readings Note that in the J M 10 Rads position the frequency range is 400 Hz to 5 kHz FM Deviation Setting 17 The f m deviation is adjusted manually as follows 18 If using internal m...

Page 30: ...djacent POWER ON l e d indicator is illuminated Thisl e d is supplied from the 12V line The five position rotary switch selects the five r f frequency ranges which are referred to by range numbers as...

Page 31: ...uency display 2 In the SLOW position the TUNE spin wheel is de sensitized to approximately 20 channels per revolution with a six digit display 3 The HOLD position electronically disengages the TUNE sp...

Page 32: ...ode is selected how ever the channel spacing reverts to the maximum possible for the band in use TABLE 1 Frequency Increments in Z f Mode Range Switch Position Frequency Increments Slow Tune Remarks 1...

Page 33: ...witch is set to INT This switch selects the amplitude modulation mode The INT position connects the internal modulation oscillator to the modulation system The EXT position permits the appli cation of...

Page 34: ...h 1 NORMAL in this position the maximum output is 3dBm 13dBm for models 9081 H and 9082H into 50Q 2 OFF in this position the r f source the synthesizer is inhibited There is no output and the display...

Page 35: ...ocket BNC 2 10 This socket accepts a 1MHz external frequency standard input The input character istics are given on page Tech Spec 2 Audio Output Socket BNC 2 11 The output from the internal modulatio...

Page 36: ...ent parts the customer is requested to include the following information a Instrument type and serial number b The type reference of the Assembly in which the particular item is located c The Part num...

Page 37: ...placement the customer is requested to include the following information a Instrument type and serial number b The type reference of the Assembly in which the particular item is located c The Part num...

Page 38: ...error voltage which tunes the VCO to bring the carrier frequency into phase lock with a multiple of the channel spacing frequency 3 3 It is essential to bear in mind that all carrier frequency changes...

Page 39: ...5 1 UCtU J c...

Page 40: ...of the FM COARSE and MODULATION LEVEL controls 3 9 The f m monitoring referred to above is carried out by feeding the Range 2 carrier signal into a mixer operating in a frequency locked loop giving an...

Page 41: ...tes the photo transistors are alternatively darkened and illuminated thereby producting two output waveforms The two photo transistors are physically aligned and there are two tracks on the transparen...

Page 42: ......

Page 43: ...r In the circuit description a particular 1C pin will be identified by a reference such as 1 IC2b 4 which indicates pin 4 on that particular gate or amplifier The logic symbols used in the circuits ar...

Page 44: ...7 Fig 20 is at OFF thus allowing the fixed 300kHz reference to pass via ICla to the divide by eight package IC2 which feeds 37 5kHz as a channel spacing reference to the channel spacing dividers in th...

Page 45: ...and IC4 and IC4 and by forming a pulse from each edge effectively multiples the spin wheel signal by four thus increasing its sensitivity 4 16 A delayed version of the spin wheel signal is fed to IC8...

Page 46: ...ch when this is operated for single step channel shifting The tuning information received by IClOb is fed to IC7a 3 where it is processed by the range and channel spacing control circuitry described b...

Page 47: ...from the spin wheel or each movement of the Step switch in Hold mode irrespective of range selection 4 28 With Channel Spacing switch S4 at Af the line from pin 27 is open circuited which turns off Q2...

Page 48: ...e IC1 1 wiM be set v a IC15d 2 An incoming tuning pulse from Cl 0b will set IC7a IC7b as previously described IC9d will be enabled but two 300kHz reference pulses will pass to pin 18 before the reset...

Page 49: ...ing The outputs from the N counter are fed direct or via the digit blanking gates described in succeeding paragraphs to the data inputs of IC5 IC9 IC21 IC14 and IC25 which operate in conjunction with...

Page 50: ...ocket SK6 into the HF Divider which is formed by the t 10 or t 1 1 divider IC30 feeding a chain of four t 2 binaries IC29b IC29a IC28b and IC28a all of which are ECL packages 4 45 Divider IC30 can div...

Page 51: ...r is IC3a and IC3b with the NOR gate IC2a The clock input to IC3a 3 is a reference frequency received via the programmed divider I C1 9 The clock input to IC3b ll is the tuning information from the N...

Page 52: ...r step down lines to the Logic Assembly This simulates operation of the STEP switch and prevents any further change in the N counter state in the direction which would drive the VCO out of range 2 It...

Page 53: ...on 4 67 Referring to circuit diagram Fig 7 the ECL circuitry on the left hand side of the diagram is concerned with division and filtering of the main oscillator signal to produce the five frequency r...

Page 54: ...owing the signal to pass through the filter formed by stubs 15 and 16 with C42 C43 and C46 When the octave level pin 8 is high it will apply forward bias to D21 thus connecting C44 which extends the f...

Page 55: ...ode D36 with R107 and C97 forms a peak detector on the output waveform which provides a d c level for automatic level control and meter information Output Metering 4 81 The r f output is peak detected...

Page 56: ...s setting the carrier level as described in the previous paragraph At the same time the other half of S 1 2 1 F inserts the attenuating resistor R26 into the meter drive path causing the meter to read...

Page 57: ...ut via Cl to SK8 The range logic at pin 15 is an inverted level obtained via Q8 in the Counter Assembly 4 92 The output at Q3 source drives the 4 package IC8a IC8b From IC8b a 30MHz signal is fed to t...

Page 58: ...but with no external standard applied the display blanking will operate because the phase detector cannot lock COUNTER ASSEMBLY 19 0845 Fig P Introduction 4 98 A portion of the carrier frequency spec...

Page 59: ...n Range 1 Table 3 gives full details of the binary and decade division and main gate periods Reference Frequency 4 102 A 10MHz reference frequency from the 120MHz Loop Assembly is fed into the CDI Chi...

Page 60: ...I COUNTER ASSEMBLY 10 MHz REFERENCE...

Page 61: ...er IC12 which offers the decoded data to the bank of LED digital indicators The 10kHz reference is fed via a presettable decade counter IC4 to a BCD to Decimal decoder IC3 which enables each display L...

Page 62: ...s 4 and 10 of IC4 TABLE 3 COUNTER ASSEMBLY DATA Tune Control Time Base Control Code x y z Display Shift Ratio Multiplier 10 n Binary Multiplier 2 r Time Base Input Freq 1MHz 2r B Main Gate Time ms Cou...

Page 63: ...MHz output at pin 6 of the Chip which is fed via amplifier Q5 to the clock input of the binary divider network formed by the CMOS packages IC11 IClOa and IClOb 4 112 The division ratio of the binary d...

Page 64: ...coded by the OR gate network IC5a b c d 4 117 On the lowest frequency range two leading zeros will occur below 10MHz The most significant digit on this range is blanked off by applying the Range 1 Sel...

Page 65: ...ocket 4 124 Referring to Fig 20 the audio signal at the slider of the Modulation level control R33b is fed to switch S8 1 R for use on AM internal modulation The signal is also fed back into the Audio...

Page 66: ...frequency 400kHz when the loop is locked is fed via emitter followers Q37 and Q40 to Q3 and Ql which with Q2 form a limiter stage and also drive a pair of Schmitt triggers ICla and IClb in anti phase...

Page 67: ...5 MAIN OSCILLATOR METER I 1 I f RANGE 4 I FREQUENCY 1 I DIVIDERS I I RANGE 3 AUDIO ASSEMBLY 19 0047 NOTE THIS DIAGRAM SHOWS MANUAL DEVIATION SETTING INTRODUCED FROM SERIAL N 1410 ONWARDS Functional B...

Page 68: ...in the capture range of IC3 then the sweep transistors are turned off This is done by using the output from the Schmitt trigger 1C 1 b which is fed via C38 emitter follower Q18 and low pass filter LI...

Page 69: ...odulated f m is fed to Amplifier IC5 whose gain depends upon the selected carrier range as follows Carrier Range 5 4 3 2 1 Amplifier Gain x 8 x 4 x 2 x 1 x 4 4 143 The difference in gain is determined...

Page 70: ...ion Principle Fig 4 4 4 148 When 0M is selected S5 1 F and R connect Cl and R7 into the line carrying the VCO audio modulating signal This provides the necessary pre emphasis In order that the meter s...

Page 71: ...R The attenuating network R8 R9 RIO and R1 1 with switch S5 1R taps down the audio modulating level according to the deviation selected In the 100kHz deviation position the signal is fed via tags 18...

Page 72: ...e for a 94V to 130V supply is supplied in the accessories bag supplied with the instrument 4 153 The three secondary windings of Tl feed the encapsulated bridge rectifiers Dl D2 and D3 which provide n...

Page 73: ...the positions for the required voltage range The switches are referred to as left hand and right hand as seen when viewing the rear of the instrument 4 Ease the plate over the slide switches such as...

Page 74: ...nalyser 7 Millivoltmeter True RMS 8 Millivoltmeter Audio 9 Audio Signal Generator 1ft Frequency Counter 1 1 Power Meter 12 Power Supply 13 Modulation Meter 14 Signal Generator 15 Power Ampl ifier 16 O...

Page 75: ...isplace or damage the RF gasket material when removing or replacing covers POWER SUPPLY TESTS 5 3 1 Do not connect the a c mains supply Check that the mains fuse is correctly rated for the supply volt...

Page 76: ...tag strip and chassis Note the correct connection of the ohmeter leads as shown in Fig 5 1 8 Set the POWER switch to OFF and the rear panel STANDARD switch to INTERNAL 9 Finally connect the a c mains...

Page 77: ...odels 9081 H and 9082H the SMA connector between the casting and the lOdB amplifier should be disconnected at the casting The SMA to Type N test lead should be connected at the casting The Type N conn...

Page 78: ...e 1MHz output from a counter is suitable and check that the display is restored and the frequency reading has not changed 6 Set the STANDARD switch to INTERNAL 7 Set the TUNE switch to FAST SLOW and H...

Page 79: ...re obtained for the ranges and channel spacings in table 8 TABLE 8 Channel Spacing Check Frequency Channel Spacing to check 400MHz All Af 5kHz 200MHz 10kHz and Af 2 5kHz 100MHz 60kHz and Af 1 25kHz 50...

Page 80: ...l tag 12 on wafer I rear of either the TUNE or FINE TUNE switches to a flying lead Alternately apply and remove this voltage at the pin of the front panel SLOW SWEEP socket At a carrier frequency of a...

Page 81: ...eter FM System 5 9 Test Equipment Required Page 5 2 Table 5 Modulation Meter 9009 Item 3 Type N to BNC Adaptor 5 10 Procedure 1 Set FA DM switch to I NT METER switch to FM pM MODULATION FREQUENCY swit...

Page 82: ...link Length of RG 213 U cable with N connectors 5 12 Procedure 1 On the UUT set the following controls OUTPUT switch to NORMAL AM and FM 0M modulation switches to OFF METER switch to CW OUTPUT LEVEL c...

Page 83: ...ust the UUT VERNIER control to obtain a reading of 9dBm on the millivoltmeter 17 Adjust Rl34on the p c b until the UUT meter reads 9dBm 18 Repeat adjustments 4 to 7 until the UUT and the miTlivoltmete...

Page 84: ...at least 3dB and 1 OdB can be obtained on the UUT meter 34 Tune the UUT to 1 5MHz 5MHz for 9081 on range 1 35 Set the multimeter to the 10V d c range Connect the positive lead to link LK1 on the p c...

Page 85: ...switch to I NT and the MODULATION FREQUENCY switch to 1kHz 6 Monitor the UUT rear panel audio output socket using the HP 400E millivoltmeter and adjust R20 on p c b 19 0847 to give a reading of 1 00V...

Page 86: ...ding of 8 on the top scale of the UUT meter 5 Set the UUT AM switch to I NT and the MODULATION FREQUENCY switch to 1kHz 6 Monitor the UUT rear panel audio output socket using the HP 400E millivoltmete...

Page 87: ...to FAST OUTPUT switch to NORMAL 2 Tune the UUT to 240MHz 3 Connect the multimeter to link LK1 on the FM loop p c b 19 0844 Fig 8 and if necessary adjust the core of T1 on the p c b to give a reading o...

Page 88: ...o FAST OUTPUT switch to NORMAL 2 Tune the UUT to 240MHz 3 Connect the multimeter to link LK1 on the FM loop p c b 19 0844 Fig 8 and if necessary adjust the core of T1 on the p c b to give a reading of...

Page 89: ...3 10kHz 3 and 3kHz 3 deviations are observed on the modulation meter for the corresponding positions on the PEAK DEVIATION switch 14 Disconnect the test equipment Check that all p c b assemblies are...

Page 90: ...MHz Analy Centre freq ser Scanwidth UUT Harmonic Sub Harmonically Level Related Signals 256 512 _ 0 1250MHz 128 256 500 MHz lOOMHz div At least At least 64 128 500MHz lOOMHz div 30dB 40db below 32 64...

Page 91: ...ire frequency range from 5MHz to 520MHz and verify that the millivoltmeter reading does not change by more than 0 6dB 1 1 dB if the Reverse Power Protection Option is fitted and the UUT meter by more...

Page 92: ...0 1 1 00kHz lOMHz div Off 5ms 4 Tune the spectrum analyser from 0 1000MHz and check that any spurious frequencies are below the following levels relative to carrier Frequency Spectrum Spurious Level M...

Page 93: ...st 70dB below carrier 10 Retain the spectrum analyser connection for the next test FAR OFF AND CLOSE IN NOISE CHECKS 5 23 Test Equipment Required Spectrum Analyser 5 24 Procedure Page 5 2 Table 5 Item...

Page 94: ...5 25 Test Equipment Required Page 5 2 Table 5 Modulation Meter 9009 Item 3 Millivol tmeter True RMS Item 7 Cable with N N connectors 5 26 Procedure 1 Check that all UUT modulation control switches are...

Page 95: ...ment Required Modulation Meter 9009 Millivoltmeter Audio 1kHz signal generator Item 9 5 28 Procedure Page 5 2 Table 5 Item 3 Item 8 1 Set the UUT controls as follows OUTPUT switch to NORMAL METER swit...

Page 96: ...arrier frequency repeat operation 3 for 100kHz peak deviation TABLE 11 FM Deviation Check Carrier 9081 Peak 9009 9081 Range freq Dev switch reading meter MHz setting kHz dev reading 5 520 100 100 2 10...

Page 97: ...Hz peak deviation reading on the 9009 Verify that the total harmonic distortion indicated on thedistortion analyser does not exceed 4 5 Retain the test equipment for the next test PHASE MODULATION CHE...

Page 98: ...the audio level at 1 00V r m s on the millivoltmeter Check deviation on the modulation meter and distortion not exceeding 4 on the analyser TABLE 12 Phase Modulation Check Audio freq Deviation Distor...

Page 99: ...ser indicates not more than 4 total harmonic distortion T H D TABLE 13 AM Depth and Distortion Check Range Carrier Set UUT Carrier Mod T H D frequency Level with Vernier Depth 520MHz 3dB 5 lOdB 240MHz...

Page 100: ...the modulation meter TF2300 to the UUT 50Q output socket 4 Tune the UUT to 520MHz 5 Refer to Table 14 Apply the audio frequencies at 1 00 V r m s and adjust the front panel FM 0M COARSE control to giv...

Page 101: ...nd verify the specified modulation depth on the modulation meter TABLE 15 AM Frequency Response Check Audio freq Millivoltmeter reading Modulation meter reading 20 Hz 800 mV 80 3 100 kHz 800 mV 80 3 1...

Page 102: ...amplifier Use the front panel RF OUTPUT connector where required for the remaining tests LEVEL ACCURACY CHECK 5 40 Test Equipment Required Page 5 2 Table 5 Mil li voltmeter True RMS Item 2 Cable with...

Page 103: ...0 5dB over the frequency range 5MHz to 520 MHz In the frequency range 1 5MHz to 5MHz 9082H only the millivoltmeter reading should not change by more than 2 75dB and the UUT meter by more than ldB 9 Di...

Page 104: ...125mV 25mV on the Millivoltmeter 3 Disconnect the test equipment INTERNAL FREQUENCY STANDARD CALIBRATION 5 47 The cycle drift method of frequency calibration described below is suitable for oscillator...

Page 105: ...nectors Page 5 2 Table 5 Item 1 1 Item 14 Item 1 5 5 51 Procedure 1 Set the UUT controls as follows OUTPUT switch to NORMAL METER switch to CW OUTPUT LEVEL to 20 dBm Modulation controls OFF 2 Tune the...

Page 106: ...1 0514 Electrolytic 10 470 j C2 21 0596 Electrolytic 16 47 j Cl 21 1520 Ceramic 500 10 lOOp C3 21 5507 Polycarbonate 100 20 C4 21 1616 Ceramic 12 20 80 lOOn C5 7 21 1684 Ceramic 63 2 22p C9 21 1686 Ce...

Page 107: ...3 3k R44 45 22 471 5 Hex Inverter 4069 IC21 20 2333 Carbon Film 3 5 33k R7 1 1 22 4717 Hex Buffer Converter 4050 IC18 20 2472 Carbon Film 1 3 5 4 7k R 1 2 69 22 4727 8 Input NAND 4068 IC1 9 20 22 20...

Page 108: ...0 10 47 p cm 20 2181 Carbon Film i z 5 180 R16 50 66 77 21 1520 Ceramic 500 10 100p 021 20 2182 Carbon Film i z 5 1 8 k Rl 49 21 1522 Ceramic 500 10 150P 002 106 20 2183 Carbon Film i 5 18 k Rl 16 21...

Page 109: ...con pnp BFX48 Q19 Inductors 23 7004 Choke r f sub min 220nH LI 2 3 4 23 7006 Choke r f sub min 470nH L7 8 23 7007 Chake r f sub min 680nH L5 6 23 7010 Choke r f sub min 2 2pH LI 0 23 23 701 2 Chake r...

Page 110: ...1 1520 Ceramic 500 10 lOOp C21 53 70 130 131 132 133 136 21 1522 Ceramic 500 10 1 5Gp C29 4 R9 100 115 116 117 21 1528 Ceramic 500 10 470p C62 21 1530 Ceramic 500 10 680p C39 42 R34 93 21 1532 Ceramic...

Page 111: ...l Value Component Reference Resistors 20 2103 20 2104 Diodes 22 1029 Silicon general purpose IN4149 Transistors 22 6041 Silicon npn BC 109 Relay 23 751 7 8 pin DIL reed relay 500fl coil W _Q i 5 10k R...

Page 112: ...IC4 20 2220 Carbon Film i 5 22 R57 22 4601 Racal CD Chip 1018E IC1 2 20 2221 Corbon Film i 5 220 R7 22 4721 Dual 4 Input NOR HEF4002 LOCMOS IC10 20 2222 Carbon Film i 3 5 2 2k R4 9 23 24 29 36 54 22...

Page 113: ...1 9 20 21 21 20 2472 Carbon Film 1 z 5 4 7k R78 25 20 2473 Carbon Film 1 z 5 47k R50 72 74 77 81 22 4713 Quad 2 Input NOR CD 400IAE IC6 20 2560 Carbon Film z 5 56 Rl 5 22 4715 Hex Inverter CD 4069BE...

Page 114: ...0 23 7086 Inductor 20 2224 Carban Film i 4 5 220k R6 30 31 20 2225 Carbon Film 1 Z 5 2 2M Rl 2 20 2393 Carbon Film 1 3T 5 39k R 19 20 2473 Carbon Film i 5 47k R18 20 4024 Metal Oxide 2 1 2k R 1 1 1 5...

Page 115: ...s 20 2470 Carbon Film i 5 47 R29 20 2471 Carbon Film i 5 470 R4 44 22 6017 Silicon npn metal can 2N2369 Q4 5 6 7 20 2472 Carbon Film i 5 4 7k Rl 3 21 30 31 38 40 22 6041 Si 1 icon npn BC 1 09 Q2 43 22...

Page 116: ...Dl 2 22 1662 Bridge Rectifier 6A VH 248 D3 22 1846 Voltage Reg 6 8V 1S 6006RA D4 22 6104 Silicon npn high power MJE 3055 Q1 Integrated Circuits 22 4220 Regulator 24V MC 7824CP IC1 22 4219 Regulator 1...

Page 117: ...ULATION FREQUENCY SWITCH ASSEMBLY 11 1215 20 4056 Resistor metal oxide z 2 47Q R17 21 Miscel laneous 20 4046 Resistor metal oxide z 1 56Q R 1 8 22 20 4020 Resistor metal oxide i 2 680Q R19 24 23 4090...

Page 118: ...Attenuator Assembly Model 9082 and model 9081 with serial numbers after 21 09 11 1414 Manual Attenuator Assembly Models 9081 H and 9082H 11 1404 Amplifier Models 908 1H and 9082H 14 1499 Coaxial conn...

Page 119: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 120: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 121: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 122: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 123: ...ing page 5 25 insert new page 5 25 a Remove Parts List pages 3a 3b Fig 6 7 Fig 14 10 11 12 and substitute new pages 3a 3b Fig 6 7 Fig 14 10 11 12 Remove existing Figs 7 15 19 20 and 22 and substitute...

Page 124: ...he 9082C Page 1 1 Paragraph 1 5 First line amend 0 5 dB 1 to read 1 dB Third line amend 130 dB to read 129 dB 1 Page Reference Amend to read 9082C Vol 2 Page 2 2 Paragraph 2 3 11 Second line amend 13...

Page 125: ...V Page Reference Amend to read 9082C Vol 2 Page 5 14 Paragraph 5 16 5 Amend 380 kHz to read 370 kHz Page Reference Amend to read 9082C Vol 2 Page 5 17 Paragraph 5 19 Cable with N N connectors delete I...

Page 126: ...line amend 800 mV1 to read 400 mV1 Table 15 amend all 800 mV to read 400 mV Amend to read 9082C Vol 2 Amend paragraph to read Tune the UUT to 500 MHz Adjust the UUT Vernier to bring signal to the top...

Page 127: ...nerator 9082C has improved AM sensitivity and better AM depth stability with carrier level change An improved vernier control of output level attenuation has been incorporated comprising an eleven tim...

Page 128: ...matic level control and meter information Output Metering 4 81 The r f output is peak detected by D36 and the information stored on C97 this level being applied via the filter L22 C98 and R128 to the...

Page 129: ...reviously described Simultaneously wafer S 1 2 1 F inserts attenuating resistance R26 into the meter path causing the meter to read half the true output level The X2 facility is inoperative In the a m...

Page 130: ...not to displace or damage the RF gasket material when removing or replacing covers POWER SUPPLY TESTS 5 3 1 Do not connect the a c mains supply Check that the mains fuse is correctly rated for the su...

Page 131: ...witch to OFF and the rear panel STANDARD switch to INTERNAL 9 Finally connect the a c mains supply lead to the rear panel plug 10 Plug in the a c mains supply 11 Switch POWER to ON Check that the Powe...

Page 132: ...o the audio output from the TF2300 and the multimeter to its d c output 17 Select AM switch to EXT on the UUT Connect a 1 kHz low distortion audio source to the AM 600Q socket of the UUT and monitor t...

Page 133: ...r reads 9 dBm 0 2 dB On the OUTPUT LEVEL switch solder AOT resistor 33kQ nominal across R27 to bring the UUT meter reading within 0 1 dB of the 9301 reading Operate the 1 dB STEP ATTENUATOR and ensure...

Page 134: ...nuation selected 34 On the UUT set The AM switch to OFF The OUTPUT switch to X2 The RANGE MHz switch to 256 512 position 35 Tune the UUT across the range and adjust R94 on the p c b output amplifier b...

Page 135: ...sket is correctly positioned and not damaged Screw the covers down tightly but avoid using excessive force which might strip the threads DISTORTION CHECK 5 17 Test Equipment Required Page 5 2 Table 5...

Page 136: ...Range MHz Analy Centre freq ser Scanwldth UUT Harmonic Sub Harmonica My Level Related Signals 256 512 _ 0 1250MHz 128 256 500MHz lOOMHz div At least At least 64 128 500MHz lOOMHz div 30dB 40db below 3...

Page 137: ...th the HP400E 4 Set the UUT controls FM 0M to OFF AM to EXT METER to read CW1 5 Tune UUT to 520 MHz and adjust the attenuator controls of the UUT to give 3dBm on the UUT meter Select 12dB on external...

Page 138: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 139: ...68 R6 20 21 62 99 0 2681 Carbon Film 1 S 5 680 R37 38 1 60 0 2682 Carban Film A 5 6 8k R93 111 155 0 2683 Carbon Film A 5 68k Rl 14 159 20 2273 Carbon Film A 5 27k Rl 61 R 1 59 5 AOT The nominal valu...

Page 140: ...con general purpose 1N4149 D1 5 16 20 22 23 7127 Ferrite coil 60 120MHz orange LI 1 25 29 39 23 7128 Ferrite coil 60 l20MHz yel low L 1 6 22 1053 Silicon u h f switch BA244 D21 26 30 23 7129 Ferrite c...

Page 141: ......

Page 142: ...de 2 lk R4 2 001 W 022 Voriable cermet 500 R8 Variable cermet 10k R20 Part No Description Rat To I Transistors 22 6017 Silicon npn 2N2369 Wigan m tici 109 Wi N ilWifiel 22 6102 FET N Channel W300D 22...

Page 143: ......

Page 144: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 145: ...846 Voltage Reg 6 8 V IS 6006RA D4 22 6104 Silicon npn high power MJE 3055 Q1 Integrated Circuits 22 4220 Regulator 24 V MC 7824CP IC1 22 4219 Regulator 1 2 V MC 781 2CP IC2 4 22 4218 Regulator 6 V MC...

Page 146: ...arbon Film a 5 270 R37 54 v DULATION FREQUENCY SWITCH ASSEMBLY 11 1215 20 3471 Carbon Film i 5 470 Rl 30 20 6028 Variable dual linear 20 50k R31 a 3 1 b 3 4056 Resistor metal oxide a 2 470 Rl 7 21 20...

Page 147: ...THIS PAGE INTENTIONALLY LEFT BLANK 9081 9082 Vol 2...

Page 148: ...ed items in the power supply refer to Fig 19 and Parts List 10 ITEMS MOUNTED ON MAIN CHASSIS other than p c b assemblies Manual Attenuator Assembly 10 dB steps Attenuator Assembly 1 dB steps Coaxial c...

Page 149: ...m h ufpuf SWITCH J flQDULAsTQE PEE amp...

Page 150: ...FM COASSE COfsTTEOL POT R3 3 3 SET metee EEADING C18 lOOn...

Page 151: ......

Page 152: ......

Page 153: ...Qju LB 1 Qu w 34 BL W BL V w Bn v w 5n BL w Bn y W V 6 w 3w e w Bn VAEACTOR 37 3 LHl gER STEP UP STEP DOWN UP DOWN PulSE EC1AL CHANNEL SELECT w o S OUTPUT SYSTEM ASSY 13 1004 1 1 ii in ii m i 24 26 2...

Search results

Summary of Contents for 9081

Reviews:

Related manuals for 9081

Brands by name

Popular brands

Racal Instruments 9081, Maintenance Manual

Search results

Summary of Contents for 9081

Reviews:

Related manuals for 9081

Brands by name

Popular brands