What is the maximal allowed deviation of the horizontal frequency?
(The following is from: Peter Bennett VE7CEI (bennett@triumf.ca)) In Canada and the US (525 line, 60 HZ, NTSC), the horizontal frequency is 15,734.264 Hz. The colour subcarrier is 455/2 times the horizontal frequency which should come to 3.579545 MHz. I believe the tolerance on the subcarrier frequency is +/- 10 Hz. Informal comparison of TV standards Q: I heard that TV in certain part of Europe has more quality in Europe then here in North America. I’d like to know the differences between the two systems. Is that why we cant use video tapes from there? (Responses from: Mark Zenier (mzenier@netcom.com or mzenier@eskimo.com)) The first difference is that a lot of the world runs on 50 Hz power as opposed to North America’s 60 Hz power. In the olden days, before active power supply regulators got cheap, it was decided that the vertical scan rate match the power supply frequency, so that ripple in the power supply wouldn’t produce obnoxious visual effects. So the PAL/SECAM signals have 50
• 31.13) Informal comparison of TV standards • 31.14) PAL-plus • Chapter 32) Service Information • 32.1) Advanced TV troubleshooting • 32.2) Service manuals for really old TVs • 32.3) How to locate service info when all the little stickers have fallen off • 32.4) Techical assistance help numbers • 32.5) Web resources • 32.6) Parts information • 32.7) Suggested references • 32.8) FCC ID Numbers of TVs • 32.9) Interchangeability of components • 32.10) Horizontal output transistor pinouts • 32.11) How do you locate the HOT • 32.12) Replacement power transistors while testing • 32.13) Testing of replacement HOTs • 32.14) Removing and replacing the deflection yoke • 32.15) Swapping of deflection yokes • 32.16) Swapping of CRTs • 32.17) Decayed glue in electronic equipment • 32.18) Repair parts sources
