On Chroma Dots and how to determine if they are present

[old_tv_nut]

Originally Posted by VintagePC

To answer your questions:
...I was reading about other types of noise and how one of them could be mistaken for chroma dots, but the name escapes me...

Thanks for the clarifications. 4.5 MHz sound carrier can look a bit like chroma, but it dances around and changes rapidly from vertical to diagonal to dots (possibly too fast to see) as the sound modulates the frequency. It is much more stationary during silence. This is suppressed by sound traps providing the fine tuning is correct. Even when alignment is perfect, if you tune toward the high end of the channel, you may be able to see the sound carrier as it comes out of he traps, provided the IF and video aren't too narrow to pass it.