It's for using an SCR-619 (BC-1335) with an AB-15. In a message dated 04/07/2012 16:55:38 PM Central Daylight Time, tbryan at nova.org writes: > I have a terminal box marked J-72/GR. Could someone tell me what it > fits? It looks like it mounts to an AB-15 and has an SO-239 on it. > > Tom Bryan > N3AJA Robert Downs - Houston wa5cab dot com (Web Store) MVPA 9480