Came accross a piece of railroad radio equipment and am hoping you can enlighten me. The label says, "Motorola Transmitter Ser. No. 13364, Max P.I. 60 W, PA 7292C". There is a flap covering an octal scocket on the front. It is the size of two shoe boxes end to end. A friend KF0TG, thinks a xtal went on the front. Any suggestions? 73, Roger - k0rmk