My thanks to all who helped me out on my transducer problem and
special thanks to Dico Reijers for sending me a
spare transducer even tho UPS sent it halfway across Canada on its
way to California.  It got here finally.

I ran my original transducer at specified RPM and then again with the
spare transducer.  Results listed below (TSIO-550E)



    RPM            Orig Transducer        Spare Transducer         % original

   1700