Bob,
The Renesis repair manual shows a picture of the signal in the CAS section. It looks like a stretched out spring with two of coils stretched more than the rest, followed by more short sections and finally another stretched section of one coil. There are 13 narrow coils followed by two stretched coils, then 12 narrow coils followed by one stretched section, then three narrow coils. Below is my lame attempt to illustrate what it should look like.
/\/\/\/\/\/\/\/\/\/\/\/\/\J\J\/\/\/\/\/\/\/\/\/\/\/\/\J\/\/\/\
You really ought to get hold of a Renesis shop manual.
Mark S.