The SCR-300 was a portable backpack transceiver that was used by the United States during World War II.
Description[]
The SCR-300 had 18 vacuum tubes which were called BC-1000 and it could use either BA-70 or BA-80 batteries.[1] With the proper antenna, the range of the radio can transmit up to 4.8 km and the weight of the SCR-300 system was about 14.5 kg which made light enough to be carried by one man.