The TCK is a beautiful transmitter. This has to be the TCK-4, or the identical Coast Guard TCK-6, as it has the rectifier power supply. All the other models have motor-generators. Transmitter: 52 5/16" x 24 13/16" x 16" 240 lb. Rectifier: 51 25/32" x 24 13/16" x 16" 170 lb. Ref: Ships 275, Catalog of Naval Equipment Richard Brunner, AA1P