SCR-270

Overview

The SCR-270 was one of the first operational early warning radars. It was the U.S. Army's primary long-distance radar throughout World War II and was deployed around the world. It is also known as the Pearl Harbor Radar, since it was a SCR-270 set that detected the incoming raid about half an hour before the attack commenced.

Two versions were produced, the mobile SCR-270, and the fixed SCR-271 which used the same electronics but used an antenna with somewhat greater resolution.

components

• BC-785 transmitter
• BC-405 transmitter
• BC-404 receiver
• BC-402 keyer
• BC-424 modulator
• BC-758 keying unit
• BC-403 oscilliscope
• BC-439 freq. meter
• BC-736 reducer
• BD-99
• BD-111
• PE-74 gen-set
• AN-118-A antenna
• AN-140 antenna
• K-22 trailer
• K-64 trailer
• K-30 truck
• K-31 truck

Related Files

TM 11-1510

War Department Technical Manual

SERVICE MANUAL FOR RADIO SETS

SCR -270-B,-C,-D,-E,-BA, -CA,

SCR-271, -A,-AA, -AAA,-AB,-B,-BA,-D,-E,-F,-G,-H,-1,-K,-L, AND -M.

25 August 1944

TM 11-1410

Preventive Maintenance Manual

RADIO SETS

SCR-270-BJ, -C, -D, -E, -BA, -CA,

SCR-271, - A, -AA, -AAA, -AB, -B, -BA, -D, -E, -F, -G, -H, -J, -L, -LA

21 June 1944