Standard Communications TVM 450, Owner'S Manual

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Page 2: ...ed in supplemental bulletins or later editions of this manual This document is the property of Standard Communications Corp and em bodies proprietary subject matter of Standard Communications Corp All de sign manufacture reproduction use and sale rights regarding the same are expressly reserved This manual may not be reproduced without written con sent from Standard Communications Corp All copyrig...

Page 3: ...IS EQUIPMENT TO RAIN OR MOISTURE See the IMPORTANT SAFEGUARDS on the following pages for additional safety instructions This symbol means that dangerous voltage levels are present within the equipment These voltages are not insulated and may be of sufficient strength to cause bodily injury if touched The symbol may also appear on schematics This symbol calls attention to a critical procedure or me...

Page 4: ... with a polarized AC line plug a plug having one blade wider than the other This plug will fit into the power outlet only one way This is a safety feature If you are unable to insert the plug into the outlet try reversing the plug If the plug still does not fit contact your electrician to replace your obsolete outlet Do not defeat the safety purpose of a polarized plug 9 Servicing Refer all servic...

Page 5: ...able entry as practical see Figure 1 TO SATELLITE RECEIVER 8 FEET GROUNDING ELECTRODE IN COMPLIANCE WITH NEC 810 21 NEC 820 22 NEC 820 40 GROUND CLAMP ANTENNA DISCHARGE UNIT SEE NOTE 2 CONNECT TO THE NEAREST ACCESSIBLE LOCATION ON THE STRUCTURE SYSTEM FEED LINE GROUND CONNECTIONS SEE NOTE 1 NOTES 1 USE 10 AWG 5 3 MM2 COPPER 8 AWG 8 4 MM2 ALUMINUM OR 17 AWG 1 0 MM2 COPPER CLAD STEEL OR BRONZE WIRE ...

Page 6: ... 1 INTERCONNECTION 4 1 OPERATION 4 3 TVM450 TVM550 TVM550II 4 3 TVM450S AND TVM550S 4 8 TVM550IIS 4 10 DSG2000 OPERATION 4 11 TEST TONE 4 12 CHANGING TO BTSC OUTPUT OPERATION 4 12 CHANGING TO COMPOSITE OUTPUT 4 12 MONITORING 4 13 COMMENCING OPERATION 4 13 DSG2000 USER ACCESSIBLE JUMPERS 4 13 OPTION INSTALLATION 5 1 CBP45 5 1 CBP45 1 5 3 CSG60 5 6 CIF450 1 5 10 CALT45 5 12 SAP AUDIO TVM550IIS 5 18 ...

Page 7: ...ling the Cable 5 4 5 6 CBP45 1 Installation 5 5 5 7 CSG60 Front and Rear Panels 5 6 5 8 CSG60 Cable Routing 5 7 5 9 CIF450 1 Option Package Contents 5 10 5 10 CIF450 1 Installation 5 11 5 11 CALT45 Option Package Contents 5 13 5 12 CALT45 Installation 5 14 5 13 IF Combiner PC Board Component Locations 5 14 5 14 Remote IF Select Installation 5 16 5 15 REMOTE IF SELECT and ALTERNATE COMP IF IN Rear ...

Page 8: ...is an optional Composite IF Loop kit that allows the external input of either aural visual or a composite IF signal through a special loop An alternate IF option is also available Channels are selected with a front panel rotary switch and the modulators can be set to only a legitimate output frequency When a modulator is on line and the frequency output is changed a circuit mutes the RF output unt...

Page 9: ...across the entire output ranges Seven segment calibrated audio deviation bar meter with BTSC input indicator and factory calibrated front panel controls with center detents RF output muting and visual lock indicator Visual and aural IF loop through compatible with all RF scrambling systems Automatic manual FCC offsets with RF output stability exceeding all specifications Share Assembly Program SAP...

Page 10: ...sp po on ns se e 5 50 0 H Hz z t to o 9 90 0 k kH Hz z 1 1 d dB B H Ha ar rm mo on ni ic c D Di is st to or rt ti io on n 5 50 0 H Hz z t to o 9 90 0 k kH Hz z 1 1 P Pr re e e em mp ph ha as si is s 7 75 5 s se ec c I In np pu ut t I Im mp pe ed da an nc ce e 6 60 00 0 o oh hm m b ba al la an nc ce ed d 4 4 5 5 M MH Hz z I In np pu ut t L Le ev ve el l 1 15 5 0 0 5 5 d dB B S So ou un nd d C Ca ar...

Page 11: ...t L Le ev ve el l 4 41 1 2 25 5 M MH Hz z 2 25 5 1 1 d dB Bm mV V I In np pu ut t L Le ev ve el l 4 45 5 7 75 5 M MH Hz z 4 40 0 1 1 d dB Bm mV V I In np pu ut t L Le ev ve el l 4 41 1 2 25 5 M MH Hz z w w C Co on nt tr ro ol l a at t C Ce en nt te er r D De et te en nt t P Po os si i t ti io on n 2 25 5 1 1 d dB Bm mV V O Ou ut tp pu ut t R Re et tu ur rn n L Lo os ss s 4 41 1 0 00 0 t to o 4 47 ...

Page 12: ... hm ms s I In np pu ut t L Le ev ve el l R Ra an ng ge e 0 0 5 5 t to o 1 1 5 5 V V p p p p 4 4 5 5 M MH Hz z O Ou ut tp pu ut t L Le ev ve el l T Te er rm mi in na at ti io on n S Sw wi it tc ch h S S5 50 01 1 H Hi ig gh h C Co om mb bi in ne er r S Sw wi it tc ch h S S5 50 02 2 O ON N 7 70 0 m mV V 4 5 MHz OUTPUT 4 4 5 5 M MH Hz z F Fr re eq qu ue en nc cy y A Ac cc cu ur ra ac cy y 5 50 00 0 H ...

Page 13: ... tt te ed d i in n t th he e f fi ie el ld d o or r f fa ac ct to or ry y i in ns st ta al ll le ed d a at t t th he e t ti im me e o of f o or rd de er r T To o a al ls so o h ha av ve e I IF F l lo oo op p c co on nn ne ec ct to or rs s u us se e C CB BP P4 45 5 1 1 P Po ow we er r R Re eq qu ui ir re em me en nt t 1 12 2 0 0 2 2 V V C Cu ur rr re en nt t D Dr ra ai in n 3 30 0 m mA A I In np pu...

Page 14: ...J Ja ac ck k AUDIO INPUTS L R SAP AUX Processed on the Audio PC Board I In np pu ut t S St ta ag ge e T Ty yp pe e E El le ec ct tr ri ic ca al ll ly y B Ba al la an nc ce ed d D Di if ff fe er re en nt ti ia al l D Di if ff fe er re en nt ti ia al l I In np pu ut t I Im mp pe ed da an nc ce e 1 10 0 k k τ τ 6 60 00 0 τ τ S Se el le ec ct ta ab bl le e v vi ia a J Ju um mp pe er r C Co om mm mo on...

Page 15: ...d N No oi is se e F Fl lo oo or r E En nc co od de e D De ec co od de e 8 80 0 d dB B T TH HD D E En nc co od de e D De ec co od de e a at t 6 66 6 7 7 M Mo od du ul la at ti io on n 1 10 00 0 H Hz z 0 0 1 1 1 1 k kH Hz z 0 0 2 2 1 10 0 k kH Hz z 1 1 0 0 F Fr re eq qu ue en nc cy y R Re es sp po on ns se e 5 50 0 H Hz z t to o 1 14 4 k kH Hz z 0 0 3 3 d dB B 2 20 0 H Hz z t to o 1 15 5 2 2 k kH Hz...

Page 16: ... Ma ax x L L R R I In np pu ut t S Si ig gn na al l a at t 4 40 00 0 H Hz z t to o 1 15 5 k kH Hz z U Un nw wa an nt te ed d N No oi is se e F Fl lo oo or r E En nc co od de e D De ec co od de e 7 70 0 d dB B T TH HD D E En nc co od de e D De ec co od de e a at t 6 66 6 7 7 M Mo od du ul la at ti io on n 1 10 00 0 H Hz z 0 0 3 3 1 1 k kH Hz z 0 0 5 5 1 10 0 k kH Hz z 0 0 6 6 F Fr re eq qu ue en nc...

Page 17: ...NEL OUTPUT Red dual digit LED numeric display Displays the current channel number being output to the RF OUT jack 6 CHANNEL SELECT Rotary switch Rotating this switch clockwise or counterclockwise changes the channel number sequentially higher or lower respectively When rotated to a different channel RF OUT is muted for ap proximately four seconds The RF OUTPUT LED goes out during this period 7 VID...

Page 18: ... TVM550II TVM550IIS 9031 Figure 3 1 Controls and Connections 11 AUDIO DEVIATION Potentiometer The center detent position is cali brated for 25 kHz peak deviation on the aural output with 0 dBm peak pro gram audio input level Rotating this pot changes the input levels ...

Page 19: ...ignal 21 RF OUT 75 ohm F connector For the 54 to 450 MHz TVM450 or 550 MHz TVM550 modulator output signal 22 REMOTE Special connector This jack is used when the CALT45 option is installed 23 VISUAL IF IN 75 ohm F connector For a visual IF input from other equipment The input level required is 40 1 0 dBmV NOTE If an IF input is used the frequency stability of the modulator is determined by the freq...

Page 20: ...rogram audio input level Rotating the potentiometer varies input levels 32 STEREO INPUT Red LED Lights when a BTSC stereo signal is present 33 VIDEO LOCK Green LED Lights when the BTSC signal is synchronized with the internal horizontal sync frequency 34 RIGHT CHANNEL Seven segment LED bar display A representation of the right channel audio input level When the sixth bar is lit a 25 kHz peak devia...

Page 21: ...M ROM Slide switch Selects either the FCC assigned standard fre quency format or a format stored in the optional FX450 PROM Power to the equipment needs to be disconnected and reconnected to activate the PROM after installation TVM550IIS with DSG2000 Digital Stereo Module See Figure 3 3 for locations of items described in this section DSG2000 Front Panel 1 L LEVEL Potentiometer Adjusts level for t...

Page 22: ...Controls and Connections Page 3 6 Owner s Manual TVM450 S TVM550 S TVM550II TVM550IIS 9982A Figure 3 3 DSG2000 Front and Rear Panels ...

Page 23: ...onitor SAP AUDIO when the SAP2000 option is installed and AUX AUDIO 12 VIDEO LOCK Green LED Lights when a video lock is accomplished 13 STR SAP Green LED Lights when unit is set up for stereo and SAP operation 14 STR Green LED Lights when the unit is set up for stereo mode 15 MONO Amber LED Lights when the unit is set up for MONO operation 16 MODE Momentary pushbutton Selects between Mono Stereo a...

Page 24: ...n for the L and R chan nels 25 and 27 27 R and Screw terminals The balanced audio input for the right channel attaches here 28 SAP and Screw terminals The SAP balanced audio input attaches here when the SAP option is installed 29 GROUND Screw terminals The ground connection for the SAP channel input 28 when the SAP2000 option is installed 30 AUX and Screw terminals The auxiliary balanced audio inp...

Page 25: ...play the channel number stored in the nonvolatile read only memory ROM Approximately four seconds after power is applied the RF OUTPUT LED will light If the selected channel has an assigned FCC offset frequency the FCC OFFSET indicator will also light NOTE When installing more than one TVM modulator into an equipment rack always leave at least one rack unit between each of them for ventilation INT...

Page 26: ...adcasts on the TV channel se lected on the TVM450 550 550II front panel 3 The third configuration illustrates the video stereo digital audio hookup for the TVM550IIS with its standard equipment DSG2000BD module 4 The fourth configuration allows direct connection between the satellite re ceiver and the modulator for stereo installations This is accomplished in the TVM450S or TVM550S models which ha...

Page 27: ...TVM550S modulators have a built in CSG60 BTSC Stereo Generator for integrated BTSC Modulator opera tion At the rear panel a Left Right baseband audio signal 10 to 10 dBm peak program 0 dBm optimum balanced 600 ohm signal can be inserted This input can be triggered by connecting the rear panel CONT Control and GND Ground screw terminals for commercial insertion When triggered the Left Right inputs ...

Page 28: ...1 25 275 75 12 5 33 T 277 25 281 75 12 5 34 U 283 25 287 75 12 5 35 V 289 25 293 75 12 5 36 W 295 25 299 75 12 5 37 AA 301 25 305 75 12 5 38 BB 307 25 311 75 12 5 39 CC 313 25 317 75 12 5 40 DD 319 25 323 75 12 5 41 EE 325 25 323 75 12 5 42 FF 331 25 329 75 25 0 NCTA Number FCC Channel Number Video Freq MHz Audio Freq MHz Offset Freq kHz 43 GG 337 25 341 75 12 5 44 HH 343 25 347 75 12 5 45 I I 349...

Page 29: ...al Audio Input slide the AUDIO switch to the MONO position and apply a 0 dBm input to the IN and IN terminal screws on the rear of the CMA60 Monaural Audio Module The BTSC INPUT LED lights when the AUDIO slide switch is moved to the BTSC position Other wise this LED remains unlit 2 The position of the 4 5 MHz switch is in either the INT internal or EXT ex ternal position depending on where the 4 5...

Page 30: ...odulation peaks Then back off the adjustment CCW until the flickering just ceases If the VIDEO OVER MOD LED is lit continuously rotate the VIDEO MODULATION adjustment CCW until the LED just starts to flicker indi cating modulation peaks Then further rotate the adjustment CCW until the flickering just ceases 120 IRE MV 800 600 400 200 110 100 90 80 70 60 50 40 30 20 10 10 30 200 40 20 40 80 100 120...

Page 31: ... programmable ROM to select the offset as pro grammed for each channel 9038 Figure 4 4 FCC Offset Switches CAUTION Care must be taken when using the FCC OFFSET switch to select a man ual offset frequency TVM450 only If a channel is selected that has an FCC assigned offset and the FCC OFFSET switch is set to any of the manual offset frequencies the actual offset frequency is not as selected For ins...

Page 32: ...n the LEFT CHANNEL LED bar display when the MONO INPUT LEVEL potentiometer is in the center detent position The STEREO INPUT LED will not light 4 5 MHz OUTPUT LEVEL Adjustment This potentiometer should not be adjusted because the 4 5 MHz signal is internal and there is no way to monitor this signal externally to make an accurate adjustment INPUT LEVEL R Adjustment 1 Make sure that a balanced 600 o...

Page 33: ...e reading this section 9000A Figure 4 5 Agile IRDII TVM450S TVM550S and Jerrold Interconnection 1 Connect the MVP IF OUT to the TVM450S TVM550S VISUAL IN connector 2 Connect the MVP INTERCARRIER to the TVM450S TVM550S 4 5 MHz OUT connector 3 Connect the MVP VIDEO IN to the TVM450S TVM550S VIDEO OUT con nector 4 Connect the TVM450S TVM550S VIDEO IN to the receiver VIDEO OUT connector 5 Connect the ...

Page 34: ...WER switch to turn the unit on 600 τ τ τ τ or 10 k τ τ τ τ Operation If a change from the stock 600 τ to 10 k τ impedance operation is needed use the following procedure to make the changes 1 Unplug the main power cable from the AC outlet 2 Remove all cables from the rear panel connectors and terminals 3 Remove the top cover by removing the two screws from each side of the unit and lifting the cov...

Page 35: ...y rectangular ones to match the LED meters on the front panel The reference numbers are the same for both configurations See Chapter 5 for accessory installation 1 To select this mode press the MODE push button 16 until the STR LED 14 lights 2 While watching the LEFT AUDIO LED string 3 adjust the L LEVEL poten tiometer 1 until the first red LED just lights 3 While watching the RIGHT AUDIO LED stri...

Page 36: ...st tone is used to calibrate the aural modulation level CHANGING TO BTSC OUTPUT OPERATION The DSG2000 module is set at the factory for video output at the VIDEO BTSC OUT connector To change to BTSC output 1 Disconnect power and remove the unit top cover 2 There are two black insulated wires jumped across the VIDEO BTSC OUT and VIDEO IN connectors inside the unit Cut them both near the middle 3 Loc...

Page 37: ...ut t D De ef fa au ul lt t P P3 3 3 3 4 4 I In n 1 10 0 k k O Oh hm m I Im mp pe ed da an nc ce e S SA AP P I In np pu ut t 1 1 2 2 I In n 6 60 00 0 O Oh hm m I Im mp pe ed da an nc ce e A AU UX X I In np pu ut t D De ef fa au ul lt t P P4 4 3 3 4 4 I In n 1 10 0 k k O Oh hm m I Im mp pe ed da an nc ce e A AU UX X I In np pu ut t P P1 14 4 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 1 10 0 R Re em mo ov v...

Page 38: ...block The component side of the PC board mounts facing the rear panel with the solder side toward the up down converter see Figure 5 1 8007 Figure 5 1 CBP45 Wiring and PC Board Locations CBP45 Installation Procedure NOTE The CBP45 option package see Figure 5 2 for contents and the CBP45 1 option package see Figure 5 3 for contents contain connectors and wiring to install an external composite IF l...

Page 39: ...the 7 inch RCA to TMP cable in the CBP45 package is a spare for this cable 5 Connect one end of the supplied 7 inch TMP to TMP coaxial cable to J303 on the IF combiner board Connect the other end to JH51 on the CBP45 board 6 Locate the supplied 2 pin connector with the red and brown wires attached a Solder the red wire to jumper U9 on TVM PC board P800 b Solder the brown wire to jumper U8 on the s...

Page 40: ... front mounting brackets b Remove the screws from the side panel toward the rear of the unit c Remove the cover screw from the rear panel d Remove the top cover 4 Remove the black paper tape covering two openings in the rear panel to the left of the VISUAL IF IN and AURAL IF IN connectors as seen in Figure 5 4 9395 Figure 5 4 Connector Sites 5 Install the F to solder terminal connector in the lowe...

Page 41: ... wire 10 Securely solder the exposed wire to the center conductor of the F to solder terminal connector as shown and the shield bundle to the ground terminal 11 Install the F to RCA connector in the upper hole with the F connector facing outward 12 Locate the supplied 2 pin connector with the red and brown wires attached a Solder the red wire to jumper U9 on TVM PC board P800 b Solder the brown wi...

Page 42: ... Remove the two screws anchoring the rear facing half of the up down con verter to the chassis 16 Align the CBP45 PC board mounting bracket holes with the up down converter board bracket holes and reinstall the screws removed in step 15 17 Reinstall the modulator top cover 18 Affix the COMP IF label to the unit rear panel as shown in Figure 5 4 19 Reconnect all cables removed in step 1 ...

Page 43: ...5 ohm coaxial cable One 3 wire cable 2 Remove the power cord from the modulator and disconnect all exterior cables 3 To remove the modulator top cover a Remove the front mounting brackets b Remove the screws from the side panel toward the rear of the unit c Remove the cover screw from the rear panel d Remove the top cover 4 Remove the plate from the front panel of the unit labeled CMA60 monaural a...

Page 44: ...he PC Boards 1 Install the P500 board in the spot where the PK00 board was removed ear lier Orient the board so the side with crystal X501 faces the rear panel 2 Removethescrewsfromtheirpostsontherightsideoftheunit lookingatthefrontpanel and install the double decked PK00 board as seen in Figure 5 8 Orient the board so the black inductors along its short edge are closest to the heat sink SCC s DBX...

Page 45: ...me gauge and color wire and use shrink wrap tubing to cover the exposed splice areas Then plug this as sembly into the PK00 board at JK03 Connector Modification On the CMA60 unsolder the longest coaxial cable from its connector and resol der it to the VIDEO OUT connector on the CSG60 Electrically the VIDEO IN and VIDEO OUT jacks will be parallel A wire connecting the center pins of the two jacks s...

Page 46: ... VIDEO IN P500 J501 Coaxial Cable MCP Rear Plate VIDEO OUT PK00 JV01 Coaxial Cable P500 J502 PK00 JK04 Coaxial Cable P500 J503 P500 JB02 2 Wire Plug PX00 JX07 PK00 J504 2 Wire Plug PX00 JX02 PK00 W502 3 Wire Plug PX00 JX06 PK00 WK01 3 Wire Plug PX00 JX03 PK00 WK04 3 Wire Plug PX00 J551 PK00 WK02 3 Wire Plug PX00 JX05 PK00 WK09 2 Wire Plug PX00 JX01 PK00 WK10 3 Wire Plug PX00 JX04 PK00 WK03 5 Wire ...

Page 47: ...r power cord from the wall socket and disconnect all exterior cables 2 Remove the modulator top cover a Remove the front mounting brackets b Remove the screws from the side panel toward the rear of the unit c Remove the cover screw from the rear panel 3 Remove the paper tape covering two openings in the rear panel to the right of the covered REMOTE CONTROL opening as seen in Figure 5 4 4 Install t...

Page 48: ...le from connector J101 on the up down con verter to the top F connector as shown Use the supplied RG 59 A U cable to jumper the new IF connectors when this option is not being used 11 Reinstall the modulator top cover 12 Reconnect all cables removed in step 1 CSG60 OR CMA60 BOARD EXISTING JACKS EXISTING RCA TO RCA CABLE F TO TMP CABLE MODIFIED IF COMBINER BOARD NEW CONNECTORS OUTPUT AMP MODULE RF ...

Page 49: ...module Because of the proximity of other boards complete the cable connections before installing the board Make sure the component side of the CALT45 board faces the unit rear panel NOTE The CALT45 has a built in CBP45 The CALT45 is not compatible with TVM series modulators containing a CIF450 composite loop kit or a CBP45 or CBP45 1 filter module and loop connectors Later TVM450 and TVM550 series...

Page 50: ...Remove the top cover 4 Measure IF combiner board R302 resistance a Locate and remove the IF combiner PC board from the TVM450 TVM550 rear panel see Figure 5 12 b Remove the coaxial cable connected to J303 on the IF combiner board Set the cable aside for later use in installing the CALT45 PC board c On the IF combiner PC board measure the resistance of resistor R302 see Figure 5 13 d Find the measu...

Page 51: ...J301 MEASURE RESISTANCE 7079 Figure 5 13 IF Combiner PC Board Component Locations 5 Reinstall the IF combiner PC board a Connect one end of the supplied seven inch TMP to TMP coaxial cable to location J303 on the IF combiner board b Reinstall the IF combiner board in the unit rear panel c Connect the other end of the coaxial cable to JN01 on the CALT45 board ...

Page 52: ...stall the supplied F to RCA connector in the TVM rear panel ALTERNATE IF COMP IN See Figures 5 12 and 5 15 for placement Here is where a hole may have to be drilled on an early TVM450 a Remove the paper cover from the REMOTE IF SELECT hole in the rear panel b Insert the F to RCA connector into the hole with the F connector on the outside of the rear panel and the RCA connector on the inside of the...

Page 53: ...on the CALT45 board to the ALTERNATE IF COMP IN RCA jack installed in step 7 see Figure 4 15 PART NO TVM450 REMOTE IF SELECT ALTERNATE COMP IF IN VISUAL IF 45 75MHz COMP IF IN IN OUT OUT AURAL IF 41 25MHz RF OUTPUT VIDEO IN 120V AC 50 60MZ 40W JAPAN SER NO LABEL 7078 Figure 5 15 REMOTE IF SELECT and ALTERNATE COMP IF IN Rear Panel Locations 12 Remove the two screws from the up down RF converter mo...

Page 54: ... the backup modulator To switch to the alternate modulator power the unit up The REMOTE IF SELECT switch can be used to manually switch to ALTERNATE COMP IF IN input for manual control systems However the Auto mode must be disabled by grounding the REMOTE IF SELECT CALT45 Installation Verification Procedure 1 Connect the IF output from another modulator to the ALTERNATE COMP IF input 2 Verify that...

Page 55: ...ocate the DSG2000 Stereo PC board see Figure 5 16 3 Position the SAP2000 PC board above the DSG2000 stereo PC board so jack J6 on the SAP2000 PC board is as shown in the figure 4 Connect the flat ribbon cable from jack P6 on the SAP2000 PC board to jack P6 on the DSG2000 stereo board 5 Install the SAP2000 PC board on the four existing standoffs and secure it with the four screws 6 Install the supp...

Page 56: ...igure 5 16 DSG2000 SAP2000 Component Locations SAP Audio Activation 1 To activate the SAP mode press the MODE push button on the DSG2000 front panel until the STR SAP LED lights 2 While watching the SAP AUDIO LED string adjust the SAP LEVEL potenti ometer until the first red LED just lights ...

Page 57: ...ld be used if in doubt The jumper has four positions that indicate an average audio level over time see Figure 5 17 Users may move the jumper to give lower average audio levels for coordination with other channels in the system However users cannot move the jumper to give higher audio level if the amplitude excursions exceed the limiting value As a rule of thumb signals with minimal excursions in ...

Page 58: ...e more than 18 dB This prevents gain increases from outputting background noise when no signal is present To prevent overmodulation the unit includes a limiter circuit with extremely fast time constants It aggressively slows the gain increase in a smooth manner to prevent distortion byproducts The last 2 dB of output 0 to 2 dB are reserved for the limiting process Hard clipping can occur only when...

Page 59: ... make sure the DSG2000B digital stereo generator option has been installed properly and is operating 2 Disconnect power and remove all cables attached to the rear panel 3 Remove the top cover of a unit that contains at least one DSG2000 digital stereo module a Remove the front mounting handles b Remove the screws from the side panel toward the rear of the unit c Remove the cover screw from the rea...

Page 60: ...Range Application Based on Maximum Excursion 6 dB Highly Compressed Off Air Broadcasts 9 dB Slightly Higher Range Audio Talk Shows etc 12 dB Midrange Audio Typical Satellite Feed Factory Default Setting 15 dB Premium Movie Channels with High Range Audio Action Features etc 8 Reinstall the unit top cover reversing step 2 9 Reconnect all cables disconnected in step 1 AGC Activation To activate the A...

Page 61: ...75 MHz CRYSTAL OSCILLATOR 41 25 MHz BPF PIN DIODE ATT IF AMP LPF WATCHDOG TIMER NOV RAM ROM PROM SWITCH OFFSET SWITCH CHANNEL UP DOWN SWITCH LED DRIVER 1ST PLL PROM AUDIO DEVIATION METER VISUAL IF IN AURAL IF IN 1ST VCO TUNING SERIAL DATA SERIAL DATA 12 MHz UNLOCK SIGNAL 20V RF OUTPUT INDICATOR RF AMP POWER SWITCH OFFSET INDICATOR RF LEVEL CONTROL 1ST LO OUT 2ND VCO TUNING 2ND LO OUT COMBINER RF A...

Page 62: ...F PIN DIODE ATT IF AMP LPF WATCHDOG TIMER NOV RAM ROM PROM SWITCH OFFSET SWITCH CHANNEL UP DOWN SWITCH LED DRIVER 1ST PLL PROM AUDIO DEVIATION METER VISUAL IF IN AURAL IF IN 1ST VCO TUNING SERIAL DATA SERIAL DATA 12 MHz UNLOCK SIGNAL MUTE RF OUTPUT INDICATOR OFFSET INDICATOR RF LEVEL CONTROL 1ST LO OUT 2ND VCO TUNING 2ND LO OUT COMBINER RF AMP MODULE UP DOWN CONVERTER MODULE MICRO PROCESSOR VIDEO ...

Page 63: ...TVM450 S TVM550 S TVM550II TVM550IIS Owner s Manual 9029S TVM450S TVM550S Block Diagram ...

Page 64: ...Owner s Manual TVM450 S TVM550 S TVM550II TVM550IIS 9032II TVM550IIS Block Diagram ...

Page 65: ...upon examination by SCC shall appear to be defective or not up to factory specifications SCC will pay all labor charges incurred in providing such warranty service To obtain warranty service the Purchaser must first obtain a repair order R O number from SCC The defective product must then be returned to SCC freight prepaid SCC will examine the product and respond to the Purchaser in approximately ...

Page 66: ... SCC and provide a purchase order for the estimated freight costs A special 24 hour shipping program has been arranged with FedEx All shipping arrangements are taken care of by the SCC Customer Service Administrator The customer will receive a package consisting of a a special shipping case b SCC specified loaner equipment and c shipping and agreement documents A purchase order number must be prov...

Page 67: ... then be shipped to SCC freight prepaid SCC will return the equipment freight prepaid Repair charges will be applied at the out of warranty rate in the event of physical or electrical abuse to in warranty equipment If SCC in its sole discretion determines that a major engineering design change is required SCC will supply free parts service information and technical personnel to assist the customer...

Page 68: ...Corp P O Box 92151 Los Angeles California 90009 2151 Shipping Address 1111 Knox Street Torrance CA 90502 Telephone 310 532 5300 Extension 316 or TOLL FREE 800 745 2445 FAX Nos Calif Int l ONLY 310 532 0397 S09485105A All other states 800 722 2329 Printed in U S A ...