I have just completed the back to back test of a total of TEN brand new C. Crane FM Transmitter 2 units. My goal was to test for consistency in field strength across a sampling of the same devices.
I also did some other interesting tests with one unit while I had everything setup. Available for your study as a pdf at:
http://www.ironrangecountry.com/ccranetest2.pdf
Also if anyone might be interested in a very slightly used C. Crane transmitter let e know ;)
TIB