Rohde & Schwarz GC 003 Manual

Stereocoder

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MANUAL

STEREOCODER

GO 003

230.8518

w—a

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M&SCHWARZ

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Summary of Contents for Rohde & Schwarz GC 003

Page 1 M&SCHWARZ Egmcwb ?¢ther 0:“ $43.3,“an @3th MANUAL STEREOCODER GO 003 mammmz< 230.8518 co> mszﬁmmhmnb :owﬁanQQmM w—a...
Page 2 Contents Table sheet Data Instructions 02erating ..Pregaration ..... Legend Fig..........Preparation ..........Local Supply 2.2.1 Adjusting ......... Preemphasis 2.2.2 Adjusting Deemphasis .......... Resistance Input 2.2.3 ..........MONO 2.2.4 Mode Operating Changing ....
Page 3 Power Supply ..nguo-nuoco-o:oo-nacoooo-n. Repairs ..IaooolonoootInocclnooouo-I Required Measuring Equipment ....Ialoooloono Trouble-shooting ......aoolitnllnalllnao ..5.2.1 Power Supply ........... 5.2.2 Generator, Input Amplifier, Indication ..oo-oo.co-ooaanoo...--cu.oooo no-ona-ooooo-a 5.2.3 Generation Pilot Processing Tone ... 5.2.4 -Coding Output Amplifier Iainooao-oouc-oooono-uoa ...o-ooan Adjustments ......
Page 4 Instructions aration Operati Legend Fig. with Input selector following positions: ®L,R R switched through inputs switched inputs built—in feeds generator selected mode; inputs —R adjusted frequency internally. Q-(off) ;_2_ L=-Ra_ndL=R. switches level Attenuator common channels INP. adjustment ”1 ‘0‘ ‘1 (2), LEVEL steps...
Page 5 indication Selector type MPXl PILOT MPX2 meter L&R é meter § switch Sensitivity "0": direct reading Position ”+10 dB": must Position added reading tone control pilot Level —-- tone control pilot Phase with tone Mode selector pilot following positions: signal pilot tone signals)
Page 6 IIIIIIIIIIiiiiEEHIIIIIIIII STEREO normal operation remote—con— These functions maintained trolled even failure supply case 0115 switch with pilot lamp Power match with supply 0.16 must Power fuse, V/125 0.08 shown voltage V/235 label with indicating Power connector STlO — supply voltage selected separate outputs,...
Page 7 This soldering- transformer. soldering—lug strip power terminal wiring which diagram below located cover, strip stereocoder removed after having above accessible from printed, insert (lg) and, necessary, fuse value Check rack. from label below value power voltage correct value. Change (g1) accordingly.
Page 8 Instructions Brief Operating coded standard generating required switch positions following signal: (:>(on). selector Input ﬂ. with channels g, 2 level adjustment Common switched i.e. preemphasis button pushed, PRE-EMPH. ®(on), level. standard i.e. pilot switch PILOT pushed. STEREO button Ogeration Inpgﬁs 2.4.1 Connections stereocoder...
Page 9 outputs. tone without pilot generator —R of built-in generator switch R and positions amplitude switch labelling. corresponding connected inputs dEm. Preemphasis normal with pushbutton Opera- switched preemphasis switched preemphasis i.e. button pushed tion capacitors. changing mono between also changed over since deemphasis flat...
Page 10 518%LEEQEEEEE‘BE switch selector ”MPX l” ”MPX 2" indication positions measure— meter scale level output upper observe possible indication meter switch slide with extended ment range additional (MPX pilot signal complete value peak represents signals). 2.4.} OutEut Connections available signal) floating (mono centre signal...
Page 11 Stereo Control MONO STEREO Pushbutton front panel Sthl.2a—2c Sthl.2b-20 connection ground Momentary Mono Stereo Signalling MONO STEREO front Lamps panel Sthl.lb—lc Sthl.la—lc (24 V/BO mA) External lamps Sthl.6a-6b Sthl.5a—5b contacts Floating 2.4.5 Pilot Tbne modes Operating selects modes: Switch following Operating "On”...
Page 12 coupled "on", internally phase selector pilot-mode With "ﬂuP AM" "off" 38—kHz positions whereas subcarrier, control with position adjustable voltage phase squarewave "Aw §ynch€0niza229£1 9122293399? coder synchronized entire pilot-tone processing Sthl.5a—c), g2 (contact connector l9-kHz signal external rear (external). ER104 link peak—to-peak;...
Page 13 Maintenance Maintenance Routine ______..____———————-——-———— recommended that However, maintenance required. Regular section according specifications checked occasionally against unit 3.2. Rated Specifications Checking Eguiggent 3.2.1 Reguired Measuring voltmeter voltmeter —70 +12.5 > generator +12.5 dEm, max. < 30 Rout TEKTRONIX bandwidth > Oscilloscope overload capability...
Page 14 Remarks value Measured Measure Input circuit Coder Hz/+6 ”on” Pilot wwﬁﬁﬁf‘ with Value decoder! ideal Referred Freguencz response kHz/+6 "off” Preemph. (Deemph. "off") decoder Referred Preemghasis kHz/—6 Hz/15 +lj.6b (BOus Preemph. (75¢s (Deemph. +17.07 ”off" decoder (t0.2 Pilot level "on" "MPX"...
Page 15 crosstalk Checking overload with with high capability Measure oscilloscope output (for M/S) checks) selective voltmeter according (for crosstalk with 5.3.8. sections 5.3.7 distortion Checking with level Apply signal input +12.5 Measure frequencies 30 Hz, kHz. harmonics corres- decoder. ponding output intermodulation 4540} distortion...
Page 16 Descri ption Circuit Channels 230.8518 sheet circuit diagram identical signal taken channels left right signals 8101 Switch .9abc. St101.0abc per- BulO Bull either paths sinewave generator internal switched inputs mits circuit. into buffer stages. decoupled switchable steps tors further buffers followed (R162/C115) R122/C101...
Page 17 6a). switching Fig. 3106/8107 (see oscillograms gates sequence T124 with starts each cycle 38—kHz within frequency subcarrier sequence with T125. T124 terminates T128 reversed T121, towards Amplifier Filter Outgut Lowgass Summing Amglifier, sheets 230.8518, circuit diagram differential designed input stage consists amglifier summigg...
Page 18 tone. pilot St101.4b (c). input Additional signal St101.4a (c). input traffic signal Radio R325); other signals (R357 gain signal stage amplified. follo- emitter identical design. MPX2 MPXl stages output T156/T157 controlled current sources with (T158) equipped T155 wers 0195/0196 (0198/C199), capacitors emitter resistors.
Page 19 shift register from signal adjustable phase, with tone pilot between adjusted delay B112. monostable (8108.12) triggers stage R316 "bf", phase corresponding approximately, means 100) divider 3113 tone. referred pilot (> about shift signal. l9-kHz used generate squarewave again phase synchronizes several functions.
Page 20 level. with same driven phase channels both level. with same phase channels driven both T107. control 3105 loop stabilized with amplitude BIOS amplifier R191 feeds with 101, rectification After peak direction opposite current constant flowing reference field—effect transistor T109 101. temperature-compensates R192.
Page 21 Sthl.la outputs signal front panel, lamps pilot Rle4 R3103 (24 V) well relays external lamps .6ab. Operating Sthl.5ab contacts signalling floating which provide 5108 front panel selected 8109 with pushbuttons mode connection controlled by momentary which Sthl.2a inputs earth. Power Supgly 230.8918 230.8518...
Page 22 Repairs Reouired Measuring Eguigment section 3.2.1. §.2 Trouble-shooting should checked boards Prior electrical components testing, (see faults following stages Visible defects. Then trace through diagram): level signal supply — power indication amplifier, generator, input tone pilot generation processing — coder circuitry, output amplifier...
Page 23 Amnlifier 5.2.4 Outgut Coding mode selector "MPX" pilot selector position input "off": auxiliary signal. (8107) Indication selector Input "MPX”) 8106 (with (8101) tone). (triggering with pilot Oscillogram Fig. Adjustments Vbltages 5.3.1 SuEEly St402.6/7. R406 Adjust R411 St402.l/2 Adjust St402.4/5). (chassis: Generator 5.3.2 desired...
Page 24 Indication 5.3.3 switched off. meter with mechanical Adjust zero signal) R221. (without electrical means zero Adjust BOO—Hz channel. left R218 signal with Adjust ”L". dB” "0 selector (320) indication switch sensitivity MPlO4: should level test point t0.05 Check +6-dEm scale. indication Adjust upper...
Page 25 inputs Auxiliary dEm. approximately points specified signal Apply EU40. Measure output ERlOé inserted). (E3107 removed StllO.7 Sthl.4a SthlJer must voltage tO.5 three output caSes Level adjustment with 5107. Switch pilot Apply BU4O load with Measure R288. with (1:0.1 Adjust STEREO. modes MONO Check...
Page 26 Pilot Ehase (8101) ”R” selector "L" input (8106) Selector indication antiphase channels ”on". signal Apply —16 dBm. about with with externally trigger oscilloscope; with output multiplex Measure oscillograms show which Figs from Sthl.jb. pilot sensitivity difference signal, with tone pilot tone pilot pure...
Page 27 Crosstalk 5.3.7 ”off". (8105). preemphasis Switch (8107) selector mode pilot with high over- (BUAO) oscilloscope using output multiplex Measure load capability. specified frequency; measure with channel Drive 7d). (see Sequence crosstalk Fig. i.e. line, from deviation zero signal. with C146. oscilloscope R263, C147,...
Page 28 57891011121311. 151E Fig. FRONT- rear-panel controls SCA-MUD. ( OPTION) Ehunge-over BR1U7, STHU BR103 BR105 BldstlOIQI‘QtotolnmUninio” unamcop... unnoqwnynvuvann auto: «v.00 >M§¢zw i’ ‘. Q‘. 0’ RIM/ R182 BR10L generator (Pilot int./ext,) Fig. Interior View 38122...
Page 29 28188 SISVHcINEEIHcI sgsoqdmaud Kouanbnd zuanbud '313 lUSUJuBISSB EOLaa pazsnﬁpe-Kloqova “1“ (ozna Iarrexad) 4nd“: 4381 (oxna ISIIBJBd) 1nd“? zuﬁta Ietteled) (ogre 1nd1no a-vq (oéna/ovna IaIIBJBd) 1ndzno mdzno zxaw Ieuﬁgs oaxags zndut 211219 1.0.33 ———————l terms Iwomppv Hv— ., q ﬁbr— Ieuﬁts 01pm 013.18% 11:!
Page 30 :ogo aegis: 4593359: A9530 Hazmﬂm — 23:» 35:68.“ 25.25 3.5382 ueoaam 3.:8... oohaaw 00.3.5 6:62 0:02 xmom «um |Ilul|/ lv‘lllll ﬁlmIOumﬂm KGB. 50:5 omhoa 0:9: £32 Ho... Ho>on I.m— m—Ez omaza 388.5 “a .801: Emumn \lllll "8 5:533 33:23 3.55" 933.3 Level Fig.
Page 31 MP 111. Oscillator 1111-2 4.250 Clock 8113.5 (=14 kHz) 11:58 ..us ‘ 8106.11 —~1 14—18805 8106.10 13106.2. 1“ 8106 " Trigger pulses ’ coder ‘ ‘1'sz B107. 8107.10 8107.4 ’ 8107.3 8108.7 Data 3» 1.1.5 1142/12275 ‘1 R 333/341 Pilot (A1? (S107TQ) B113...
Page 32 MPHB 1‘ Pilot tone level Input 4.3”) 1.55V (vpp >‘64 ans) 2.73 < aVss) <1,oa > i.e. times overload, division approx. C Oder circuitry Qscillograms 38122...
Page 33 Diagrams Drawings Translations Ausgangsverstgrker Output amplifier Coding Codierung input Eingang input Eingang input Eingang output Ausgang Mono signal Monomeldung Mono relay Monorelais lOWpéss filter Tiefpass — Line filter Netzfilter Pilot amplitude Pilotamplitude Pilot phase Pilotphase Pilot tone Pilotton Pilot-tone output Pilottonausgang Pilot—tone generation...
Page 34 Additional-signal input .Zusatzeingang Additional signal Zusatzsignal filters lB-kHz lowpass Tiefpasse 38122-55...
Page 35 nonoeascnwmz STEREOCODER GO 003 for the most exacting requirements (channel separation dB); stereo multiplex signal according CCIR, EBU and generates recommendations modulate transmitters (pilot-tone system) Data sheet...
Page 36 STEREOCODER GO 003 Characteristics Uses ”left“ and "right“ infor- the GO 003 is with Stereocoder GO 003 combines checking equipped high-grade purposes, L+Ft for the forms coded floating Signal ( mation stereo signal (multiplex signal, output for transmitter modulation signal) according pilot-tone Recommendation...
Page 37 STEREOCODER Description SCA modulator be fitted in the In conventional either multiplex signal. optional stereocoders, encoding performed time— method Stereocoder shorting plug. frequency-division multiplex (matrix method) by removing division method switching multiplex (switching method) using electronic switches. After modulator consists eight adding that...
Page 38 SPECIFICATIONS GmbH & Co. KG D-BOOO Miinchen Miihldorfstr. Tel. (089) 4129-1 +49894129-1 Telex 523703 “OHDE&SCHWARZ Printed in the Fed. Data tolerances: Rep. Germany Subject change without order magnitude only ‘...

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