Quote:
Originally Posted by Chris K
Goodness I think I’m starting to understand some of this! The 21.25 and 27.25 suppression in the video if by the traps thereby expands the video bandwidth?
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The importance of setting the 27.25MHz traps is to help ensure the video carrier is at about 45% on the Nyquist slope. The 21.25MHz traps provide the sharp attenuation below 22.1MHz to allow a wider video bandwidth without the sound interfering with the video. If the 21.25MHz traps are misaligned, you may see a sound carrier beat with the video carrier which is a fine pattern interference. Also the first 21.25MHz trap is the sound take off point for the sound IF amplifier.