Revision as of 06:02, 9 April 2013 edit Vegaswikian (talk \| contribs) 270,510 edits Disambiguated: RF → radio frequency ← Previous edit		Revision as of 08:52, 9 April 2013 edit undo Nedim Ardoğa (talk \| contribs) Extended confirmed users, Pending changes reviewers 69,709 edits m →Measurement Next edit →
Line 11: ==Measurement== [[File:0 pulse.svg\|thumb\|525px\|Left: Input CVS (1000 mV., sawtooth) – Right: Demodulated output with zero ref pulse]] To adjust the modulation index, an input of maximum level CVS (1000 mV) is applied to the modulator. The modulated RF signal is ~~than~~then applied to a professional TV receiver . The receiver has a facility to switch off RF for a short interval in each consecutive line. So during this interval, modulation ratio is effectively 0%. The interruption on all lines in a frame is observed as a vertical white bar on a visual monitor. This bar is named as 0 reference pulse (or simply 0 pulse). The oscillogram of the 0 pulse is a pulse with a level more than the maximum level of the CVS. Taking the level difference between the [[Analogue television synchronization\|sycn]] tip and the 0 pulse as % 100, the maximum CVS should be 10% or 12.5%. The adjustment of the modulation index is simply the level adjustment of the modulating signal (CVS) at the input of the modulator.

Zero reference pulse: Difference between revisions