Scientific Atlanta 6275 Frequency Agile Demodulator

S-A 6275 Demodulator

 Description

 The Model 6275 Demodulator is a high-performance, frequency agile demodulator designed for CATV, off-air as well as IF applications. Your headend will deliver superior quality video signals free from quadrature distortion by using the demodulator’s synchronous detection capability. The Model 6275 Demodulator’s IF section uses SAW filter technology to provide optimum VSB detection performance. In addition to providing off-air demodulation for primary applications, the Model 6275 Demodulator is ideal for backup of existing fixed channel demodulators. The Model 6275 Demodulator can also be used as a CATV headend signal monitor for loss detection and quality assurance of delivered video.

Applications

 In Demod/Remod headend applications, off-air signals are integrated with CATV signals. This is accomplished by using the separate video and audio outputs from the Model 6275 Demodulator as inputs to conventional modulators. The audio output from the Model 6275 Demodulator is directly compatible with either the 4.5 MHz subcarrier input or baseband audio inputs of most common CATV modulators. The subcarrier interface is preferred to maintain optimum BTSC stereo audio performance. For mono audio applications, the baseband audio is available from the left and right XLR connector on the Model 6275 Demodulator rear panel. This connector interfaces to the baseband audio input on the modulator.

 Features

__ Tuner covers all range from 55.25 MHz to 801.25 MHz

__ Predefined Channels for CATV and off-air

__ Random access, search or single up/down tuning

__ HRC/IRC offset tuning with storage capability

__ Demodulation with automatic frequency tilt correction (+/- 2 dB)

__ 2 Video outputs with auto AGC or manually adjustable between -3 dB and +3 dB

__ Audio Line output, adjustable between -6 dB and +6 dB

__ Simultaneous outputs provided for BTSC L&R, SAP, wideband and 4.5 MHz audio

__ Headphone output on the front (BTSC/SAP selection and level via soft keys)

__ ZRP function, line selectable

__ Keyboard and LCD Control

__ Full monitoring and control with ROSA/TNCS via SNMP

__ Full range 100-240 V AC power supply or -48 V DC power supply