general catalog - Index of

ClassA HEADENDSCRF. Free-To-Air Digital Cable TV Reception EquipmentCable TV reception, standard DVB-C / MPEG-2 (EN 300 429).Digital-to-Analogue Transmodulation Process (QAM → AM) that presents the clear TV programmes transmitted in QAM Cable-TV channels on conventionalvestigial side band VHF/UHF channels (any TV system and Colour system).QAM receiversMODEL CRF-111 CRF-121REF. 4086 4087Output channel TV System B / G D / K / I / LAudio modeMonoOutput channel Colour SystemPAL , SECAM , NTSCRemote Programming FunctionYESInput channel located between MHz 51 - 858Input level dBm -64 ... -20 (64QAM modulation)Selectable output channel located between: MHz 45 - 862Adjustable output level dBµV 65 to 80Supply voltage VDC +12Consumption mA 690FUNCTIONAL DESCRIPTION OF THE CRF RECEIVERSA CRF receiving module carries out the complete channel processing from the input to the output:- tunes a QAM modulated RF carrier in the 51-858 MHz band,- selects a TV programme from the multiplex being received, and- directs it on a conventional TV channel which is selectable throughout the 45-862 MHz band.Programming of each module involves the following selections and settings:- Central Input Frequency (250 kHz increments).- Input Symbol Rate (0.001 MS/s increments).- Input Modulation Scheme (16, 32, 64, 128 or 256QAM)- TV Programme and Audio Service.- Parameters of the output TV channel (video carrier frequency, TV system, colour system,video modulation depth, audio modulation index, carrier level ratio, output level).- Image Format. Possible conversions are 16:9 to 4:3 Pan&Scan and 16:9 to 4:3 Letter-Box.Example of «CRF» headend for eight clear digital cable TV programmes.ClassA Headends63