The SCR-203 was a low power, short range, portable command set designed to clamp onto a Phillips pack saddle for animal-pack transportation and operation. It was used primarily by the cavalry, and field artillery. It consisted of the BC-228 transmitter, the BC-227 receiver, and BC-235 control box and could transmit 7.5 watts AM voice, MCW, or CW for a range of approximately 30 miles. Its radio frequency coverage was approximately 2.0 to 3.0 Mhz. The unit was powered by various battery packs and a GN-35 hand cranked generator and used a 25 ft whip antenna.
The mule-packed radio concept dates back to before World War I, but due to the decline of the Horse Cavalry and the miniaturization of radio components, the SCR-203 was the last of the U.S. Army's radio sets designed to be animal-mounted. The SCR-203 was replaced by the SCR-245.
- TM 11-227 Radio Communications Equipment 1944
- TM 11-487 Electrical Communication Systems Equipment 1944
- TM 11-293 operators manual
- https://web.archive.org/web/20100413132056/http://www.gordon.army.mil/ocos/museum/equipment.asp scr and bc lists
- https://web.archive.org/web/20090530030151/http://pages.cthome.net/fwc/SCR.HTM SIGNAL CORPS RADIO SETS, F. W. Chesson
- http://sill-www.army.mil/FAMAG/1942/APR_1942/APR_1942_PAGES_312_317.pdf in use