[Helder Crespo]

Originally Posted by Argus25

Thank you.

There is a very good description of equalizing pulses and their application in Principles of Television Engineering, by Donald Fink, McGraw-Hill, 1940.

He points out that the purpose of the equalizing pulses is to make the shape of each vertical pulse the same, after separation. The shape otherwise is not the same as in one case the vertical sync block starts with a 1 line delay from the preceding H pulse and on the next field a 1/2 line delay. The equalizing pulses fix this issue.

Still, even without this issue fixed, it is still possible to have a respectable interlace. They also recommend that the filtering is not so heavy that the serrations are completely removed from the V sync, but I have found the interlace is fine if they are filtered to the extent that they are just removed as shown by V sync recordings from RCA, but gross over integration is a bad idea. Also, two stage integrators were being shown at this point in time in the American literature.

Thanks! I found the book online here: https://www.americanradiohistory.com...-Fink-1940.pdf