General Instrument C6M-II Installation Manual Download

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C6M-II
Commander 6 Modulator

Installation Manual

ENT

87.5

REF OFF
VIDEO OFF
VIDEO B
AUX IF
PRGM IF
REMOTE

-20dB

TEST

OUT

VIDEO

video modulation (%)

audio deviation (kHz)

C6M-II

Summary of Contents for C6M-II

Page 1: ...C6M II Commander 6 Modulator Installation Manual ENT 20 80 87 5 95 5 20 25 30 50 REF OFF VIDEO OFF VIDEO B AUX IF PRGM IF REMOTE 20dB TEST RF OUT VIDEO video modulation audio deviation kHz C6M II...

Page 2: ...ent sur le mat riel brouilleur du Canada Special Symbols That Might Appear on the Equipment The symbol shown on the left a reaching hand in a triangle with a slash through it is intended to alert the...

Page 3: ...6M II SE Kit 2 2 Model Conventions 2 3 Front Panel Controls and Displays 2 3 Rear Panel Connectors 2 5 The Menu System 2 8 Using the Menus 2 9 Changing a Menu Item 2 9 Main Menu 2 10 Option Menu 2 11...

Page 4: ...Connection with C6M II SE 3 8 Video Scrambling 3 9 CW Output 3 10 Stereo IF Interfacing 3 11 Composite Baseband Interfacing 3 12 CMTS MVP II C6M II Connections 3 13 C6R VCII CMTS MVP II C6M II Connect...

Page 5: ...nterfacing 3 11 Figure 3 9 External composite baseband connection 3 12 Figure 3 10 C6M II MVP II CMTS interfacing 3 13 Figure 3 11 C6R VCII CMTS MVP II C6M II connections 3 14 Figure 4 1 Video to IF m...

Page 6: ...ower consumption and heat Features of the C6M II include n 1 GHz tuning capability n Frequency selection in 12 5 kHz steps or channel map n Automatic source signal switching n Front panel user friendl...

Page 7: ...ty Chart provides the priority chart for IF Appendix E Application Notes provides instructions for installing the C6 LPF600 928 363 000 or equivalent filter Related Documentation The following documen...

Page 8: ...ir is necessary call the General Instrument Repair Facility at 1 800 227 0450 for a Return for Service Authorization RSA number before sending the unit The RSA number must be prominently displayed on...

Page 9: ...p to 149 channels with a typical performance of 63 dB c n normalized to 4 MHz The precision frequency stability of the C6M II meets the band frequency accuracy requirements for the FCC The FCC mandate...

Page 10: ...hing priority The PRGM IF switch is used for program switching or automatic program replacement when video A and or video B are absent The MOB accessory also accepts the external 4 5 MHz input The 4 5...

Page 11: ...front panel of the C6M II modulator which includes an operational display test ports a keypad for adjustments a bar graph and a status display is illustrated in Figure 2 1 Figure 2 1 C6M II front pane...

Page 12: ...a comb generator signal is not applied to the rear panel REF IN connector or when the reference signal level is too low or missing for phase lock operation This function applies only to units with pha...

Page 13: ...ote All external jumpers take precedenc e over menu selection This includes AUX IF VIDEO B SUBCARRIER and PRGM IF WARNING RF OUT is a high performance RF connector Using a cable with a male connector...

Page 14: ...dBmV minimum unmodulated picture IF carrier for use with the MVP II video processor This is an F type coaxial connector F REMOTE connectors See the remote control option installation manual for detai...

Page 15: ...input is normally a balanced 600 ohm input with a ground This can be switched using the menu to a high impedance input 15 kohms To switch to the high impedance input choose AUDZ HI on the Audio menu...

Page 16: ...nual The Menu System The C6M II is operated by menus which are accessed by the four push buttons and the ENT key located on the front panel The relationship of the menus is shown graphically in Figure...

Page 17: ...licable Changing a Menu Item When changing any menu item follow these general procedures If the item is located on the Main menu display it using the up and down arrow keys If the item is located on t...

Page 18: ...pth of modulation Audio Deviation Adjusts the deviation of FM modulation Increase or decrease by holding down the up or down arrow key until the desired deviation is reached Press ENT to implement the...

Page 19: ...s the choice e g STD to flash The up or down arrow key pages through the flashing choices IRC HRC STD FRQ EIA The ENT key implements the choice If FRQ is chosen the RF output frequency appears and the...

Page 20: ...est Inputs Selects the input sources to the unit The selection is not permanent Used for testing or troubleshooting input sources CMP SUB VB and PGM are available only if the modulator option board is...

Page 21: ...es automatic switching to VIDEO B AUDIO B when VIDEO A is missing Available only when the modulator option board is installed Audio Menu To access the Audio menu display AUD MENU on the Main menu To r...

Page 22: ...ncoder option is in operation it is set to OFF displays MTS and cannot be changed The stereo encoder has built in AGC circuitry Remote Menu When the optional C6 RC II is installed the following items...

Page 23: ...t source is being used This message is displayed when the user selected input is absent or below threshold level MTS UNKD Stereo encoder is not operating properly Ensure that the video input to video...

Page 24: ...ions on the terminal block Five screws with split ring washers Provided as spares parts for the terminal block If you are installing the C6M II in a system that currently has a C6M and will operate in...

Page 25: ...ion of the unit follow this procedure Install an F type coaxial cable jumper between the PIF IN and PIF OUT connectors on the rear panel Install an F type coaxial cable jumper between the SIF IN and S...

Page 26: ...m the speaker Figure 3 2 Operational check connections Switching Capabilities The applications below describe a few of switching features of the C6M II For other switching applications refer to Append...

Page 27: ...y the PRGM IF terminal on the rear panel can be activated by connected ground The unit will remain switched until the terminal is connected to 5V dc Refer to Rear Panel Connections in Section 2 The re...

Page 28: ...nal When the stereo encoder option is installed in the unit the following audio parameters cannot be changed audio input range input impedance pre emphasis and AGC Audio A can be stereo encoded while...

Page 29: ...on C6M II Installation Manual Typical Interconnections Basic Video and Audio Interfacing Figure 3 3 shows the standard connections for a video and audio input and RF output Figure 3 3 Basic video audi...

Page 30: ...Installation 3 7 C6M II Installation Manual Satellite Link Connection Figure 3 4 shows the connection between the C6R VCII satellite receiver and the C6M II Figure 3 4 Satellite link connection...

Page 31: ...n Manual Satellite Link Connection with C6M II SE Figure 3 5 shows the connection between the C6R VCII satellite receiver and the C6M II with the Stereo Encoder option installed Figure 3 5 Satellite l...

Page 32: ...C6M II Verify that the MVP II is in standby mode Select video A input INPT VA on the Main menu and activate IF AGC on the Option menu display Tune to a test channel Ensure that appropriate test equipm...

Page 33: ...ontrol on the Option menu to set RF level Do not use RF level control to set the RF output level at this stage CW Output The CW output is a 45 75 MHz carrier signal that can be used with the MVP II wh...

Page 34: ...7 if the MOB option board is installed To activate the subcarrier input select the Input selection menu item INPT SUB on the Main menu or short the subcarrier terminal on the rear panel to the ground...

Page 35: ...posite baseband input connect the unit as shown in Figure 3 9 To activate select the Input selection menu item INPT CMP on the Main menu or short the subcarrier terminal on the rear panel to the groun...

Page 36: ...Installation 3 13 C6M II Installation Manual CMTS MVP II C6M II Connections Figure 3 10 shows the connections between the CMTS MVP II and C6M II Figure 3 10 C6M II MVP II CMTS interfacing...

Page 37: ...stallation C6M II Installation Manual C6R VCII CMTS MVP II C6M II Connections Figure 3 11 shows the connections between the C6R VCII CMTS MVP II and C6M II Figure 3 11 C6R VCII CMTS MVP II C6M II conn...

Page 38: ...se with varying video signal levels and when switching between video sources at different levels C The video system is applied to a dc clamp circuit The dc clamp can be disabled through the menu D The...

Page 39: ...ce AUDZ LOW which is 600 Ohms balanced or high impedance AUDZ HI which is 15 kohms may be selected D A variable gain stage sets the FM deviation to the required 25 kHz This can be adjusted through the...

Page 40: ...4 5 MHz audio source J The subcarrier is mixed with the unmodulated 45 75 MHz signal to create the 41 25 MHz sound IF frequency K The sound IF carrier is bandpass filtered and applied to an amplifier...

Page 41: ...relay switch When not in use the composite IF output should be terminated with 75 Ohms F The second input to the relay is normally from the AUX IF input connector G After IF switching operations the...

Page 42: ...LL according to the channel or frequency setting F The channel frequency output signal from the second mixer is applied to a variable loss PIN attenuator The circuit s loss is controlled by the RF out...

Page 43: ...n channel 50 to 750 MHz 13 dB minimum within channel 750 to 1000 MHz Sound Carrier Level adjustable 10 to 20 dB relative to video carrier C N Ratio normalized to 4 MHz In band 68 0 dB minimum 70 0 dB...

Page 44: ...ase 1 0 degree p p maximum 87 5 modulation Tilt 1 maximum Audio Input Level Range Low 10 to 10 dBm Z0 600 Ohm High 5 to 25 dBm Z0 600 Ohm Input Impedance Low 600 Ohms balanced High 15 kOhms minimum Fr...

Page 45: ...25 199 2500 199 2500 11 12 204 0102 205 2625 205 2500 205 2500 12 13 210 0105 211 2625 211 2500 211 2500 13 14 120 0060 121 2625 121 2625 121 2625 14 A 15 126 0063 127 2625 127 2625 127 2625 15 B 16 1...

Page 46: ...312 0156 313 2625 313 2625 313 2625 39 Z 40 318 0159 319 2625 319 2625 319 2625 40 DD 41 324 0162 325 2625 325 2625 325 2625 41 EE 42 330 0165 331 2750 331 2750 331 2750 42 FF 43 336 0168 337 2625 337...

Page 47: ...Y 70 450 0225 451 2625 451 2500 451 2500 62 ZZ 71 456 0228 457 2625 457 2500 457 2500 63 72 462 0231 463 2625 463 2500 463 2500 64 73 468 0234 469 2625 469 2500 469 2500 65 74 474 0237 475 2625 475 25...

Page 48: ...7 2500 93 102 642 0321 643 2625 643 2500 643 2500 94 103 648 0324 649 2625 649 2500 649 2500 100 104 654 0327 655 2625 655 2500 655 2500 101 105 660 0330 661 2625 661 2500 661 2500 102 106 666 0333 66...

Page 49: ...3 2500 823 2500 129 133 828 0414 829 2625 829 2500 829 2500 130 134 834 0417 835 2625 835 2500 835 2500 131 135 840 0420 841 2625 841 2500 841 2500 132 136 846 0423 847 2625 847 2500 847 2500 133 137...

Page 50: ...3 948 0474 949 2625 949 2500 949 2500 150 154 954 0477 955 2625 955 2500 955 2500 151 155 960 0480 961 2625 961 2500 961 2500 152 156 966 0483 967 2625 967 2500 967 2500 153 157 972 0486 973 2625 973...

Page 51: ...The illustration below shows the frequency 503 2625 1 Press the right arrow key In this case the digit 3 flashes as shown below Press the up arrow key The digit 4 appears and flashes as shown below I...

Page 52: ...e appears A summary To reach any item in a menu Use the up or down arrow key menu wraps vertically To get into a submenu e g Option Use the right arrow key To get out of a submenu Use the left arrow k...

Page 53: ...C6M II Installation Manual Appendix D Signal Priority Chart...

Page 54: ...D 2 Signal Priority Chart C6M II Installation Manual...

Page 55: ...Signal Priority Chart D 3 C6M II Installation Manual...

Page 56: ...D 4 Signal Priority Chart C6M II Installation Manual...

Page 57: ...Signal Priority Chart D 5 C6M II Installation Manual...

Page 58: ...C6M RF output and may cause interference with analog and digital channels or data carriers operating above 600 MHz To minimize this potential problem install a C6 LPF600 The C6 LPF600 is a high perfor...

Page 59: ...2 Application Notes C6M II Installation Manual Specifications Passband Stopband Bandwidth 10 to 600 MHz 600 to 1000 MHz Insertion Loss 2 0 dB maximum 40 dB minimum 673 MHz Return Loss 14 dB minimum N...

Page 60: ...General Instrument Corporation GI Communications Division Printed in U S A 410515 001 99 3 97...

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