Specifications

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Section 1: Headend Equipment
Modulators
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1 - 28
Analog Signal Processing Commander 8 Modulator NTSC
The Commander
TM
8 Modulator (model C8M) is the next generation headend television modulator that delivers superior
performance in all areas with an unprecedented feature and option set. Two frequency agile models, the C8M-L (50 to 600
MHz) and the C8M-H (550 to 1000 MHz), cover all current and future broadband frequency requirements up to 1 GHz, with a
convenient 50 MHz frequency overlap between models. Superior individual CNR performance of the C8M guarantees
combined Commander 8 CNR of 65 dB for 149 channels.
The C8M uses a bright, two-line vacuum fluorescent display (VFD) that provides access to all modulator controls and is
accessed via a convenient menu system. Front panel RF, IF, aural subcarrier and video test points are provided. Easy rear
panel fuse access is also available.
The C8M provides as a standard feature two video/audio inputs and two IF inputs for redundancy, emergency alert or
programming purposes, providing operational flexibility. The input sources may be switched automatically or manually.
Provisions for adjusting peak-to-average audio level in four steps is provided with the audio AGC. The video DC clamp can be
referenced to sync level, burst level or both, and an adjustable video white level clip function is also provided. Video AGC is
also a standard feature.
The C8M is network management ready, and is compatible with the NETsentry Network Management Systems via the
LIFEnet proxy as well as with the Headend Control Software (HCS).
The C8M is compatible with many commercial scrambling systems, offering a composite IF input connection to facilitate
interfacing with model MVP-II in all scrambling modes, and dual IF loop-through connections for other encryption systems.
The C8M also interfaces easily with the model CMTS BTSC stereo encoder; DSR-4500 DigiCipher
®
satellite receiver; C6BD
television broadcast demodulator; and OAPL-* VHF off-air phaselock generator.
The C8M also supports IF to RF upconversion of digital signals including 64 QAM, 256 QAM, 8-VSB and QPSK signals.
Ordering Information
Part Number Description
C8M-L-XX NTSC Modulator, 50-600MHz
C8M-L-XD NTSC Modulator, 50-600MHz, DC pwr
C8M-L-SX NTSC Modulator, 50-600MHz, Stereo (No SAP)
C8M-L-SD NTSC Modulator, 50-600MHz, Stereo (No SAP) DC pwr
C8M-L-BX NTSC Modulator, 50-600MHz, Stereo & SAP
C8M-L-BD NTSC Modulator, 50-600MHz, Stereo & SAP, DC pwr
C8M-H-XX NTSC Modulator, 550-600MHz
C8M-H-XD NTSC Modulator, 550-600MHz, DC pwr
C8M-H-SX NTSC Modulator, 550-600MHz, Stereo (No SAP)
C8M-H-SD NTSC Modulator, 550-600MHz, Stereo (No SAP) DC pwr
C8M-H-BX NTSC Modulator, 550-600MHz, Stereo & SAP
C8M-H-BD NTSC Modulator, 550-600MHz, Stereo & SAP, DC pwr
• Superior carrier-to-noise performance
• 1 GHz bandwidth in two models
• Frequency selection in 12.5 kHz steps
• Video/audio AGC standard feature
• Integrated DSP based BTSC stereo/SAP encoder
option
• Video loop for baseband scrambling compatibility
• Network management ready
• DC power capable
• Downloadable firmware