Well now I think the smallest, albeit receive-only and I don't know for sure if any were made, was a MITE designed to fit into an aircraft instrument case. U.S. patent 3,063,540. --- "Ya can argue all ya wanna, but it's dif'rent than it was." "No it ain't! No it ain't! But ya gotta know the territory." Meredith Willson, The Music Man