Hi Chris,

That makes things a lot clearer. Some where I read that a square wave only used the positive parts of the wave and never went below zero. That created the confusion.

The link you sent is great.

The freq. analyzer in Cool Edit show the main freq. as well as all the harmonics and in most cases it does show the odd harmonics decreasing in amplitude as predicted but not at all freq. At some freq I see the even harmonics creeping in and increasing in amplitude. I am trying to make a file of the charts so I can post some of it. The problem is it is inside the application.

Thanks again, you hit the nail right on the head.

Spiritlrp