UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Question about scanning and "sync pulses"

TonyDuell · 4th Nov 2017, 5:49 am

As I understand it the sync pulse does re-start the sawtooth to begin a new line or frame.

The scan lines do slope down slightly due to the ongoing vertical deflection signal). But its not noticeable for 2 reasons, firstly the slope is small (you have 525 or 625 lines, so <1mm 'error' between the ends) and secondly (at least in a traditional TV system) the camera tube was scanned in the same way so the scan lines on the photosensitive target slope in the same way.

4th Nov 2017, 5:49 am	#2
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,224	Re: Question about scanning and "sync pulses" As I understand it the sync pulse does re-start the sawtooth to begin a new line or frame. The scan lines do slope down slightly due to the ongoing vertical deflection signal). But its not noticeable for 2 reasons, firstly the slope is small (you have 525 or 625 lines, so <1mm 'error' between the ends) and secondly (at least in a traditional TV system) the camera tube was scanned in the same way so the scan lines on the photosensitive target slope in the same way.