The SCR-299 "mobile communications unit" was developed to provide long-range communications during World War II. The US Military sought improvements of range, flexibility and durability over its existing SCR-197 and SCR-597 transmitters. In 1942, Hallicrafters Standard HT-4 was selected as the SCR-299's transmitter, known subsequently by its military designation as the BC-610. The SCR-299 was first used on November 8, 1942 during Operation TORCH involving companies of the 829th Signal Service Battalion establishing a radio net that could exchange messages between beach-landed forces and bases in Gibraltar. Despite initial problems unloading the sets from convoy ships, the SCR-299s served until the installation of permanent Army Command and Administrative Network stations.^[1] According to US Army military historians, "General Dwight Eisenhower credited the SCR-299 in his successful reorganization of the American forces and final defeat of the Nazis at Kasserine Pass."^[2]

The range of the SCR-299 exceeded original specifications, sometime establishing contact over 2,300 miles (3,700 km).^[3]

The SCR-299 provided reliable communications with England during the North African campaign, and in Normandy on D-Day, served as a connection between two airborne divisions with Britain.^[4] The SCR-299 was also used in the invasion of Sicily and the Allied invasion of Italy.^[2]

War correspondents and press reporters frequently made use of the SCR-299 and SCR-399. Access to the sets was provided to them by US Second Army and US Third Army Group Communications Teams, and in one instance, the SCR-399 became the only means of getting press copy direct to London.^[5]

In 1944, a short subject film was produced by the Jam Handy Organization and sponsored by the Hallicrafters Company that showed the construction of the SCR-299 and dramatized its use during World War II.^[6][7]

Hallicrafters Company advertising of the period sometimes used illustrations of the shelter-mounted SCR-399 to describe the achievements of the SCR-299.^[8]

• Transmitter: BC-610 plus BC-614 (speech amplifier), BC-729 (tuning unit) and BC-211 (frequency meter)
• Transmitter output power: 350 watts.
• Receivers: BC-312 and BC-342
• Frequency coverage: HF from 2 to 8 MHz (and 1–18 MHz using conversion kits)
• Power supply: 2000 watts, with additional 1500 watts for heater and lights supplied by PE-95 (power unit) on K-52 "Ben-Hur" style trailer. Optional 12 volt storage battery, or 115 volt 60 cycle AC commercial power and two spare 6 volt storage batteries
• SCR-299 housing: K-51 van truck
• SCR-399 housing: HO-17 shelter mountable on 21⁄2-ton trucks.
• SCR-499 housing: air-transportable
• Frequency Conversion Kit MC-503: coverage down to 1 MHz.
• Frequency Conversion Kit MC-516: coverage to 12 MHz
• Frequency Conversion Kit MC-517: coverage to 18 MHz.
• Antennas: 9-foot (2.7 m) whip antenna (receiver), 15-foot (4.6 m) whip antenna (transmitter). Optional 21 ft (6.4 m) whip antenna while stationary or 45 ft (14 m) auxiliary wire antenna for 2.0 to 4.5 MHz coverage.^[9]
• Remote control: field telephones, control boxes and cable.^[10][11]

• ARC-5
• BC-348
• BC-654
• BC-610
• Collins Radio
• Hallicrafters SX-28
• M-209
• R-390A
• SCR-300
• SCR-536
• Signal Corps Radio
• Wireless Set No. 19
• List of U.S. Signal Corps Vehicles

• TM 11-227, 10 April 1944
• TM 11-280-B
• TM 11-487 Oct. 1944, page 406

• Hallicrafters HT-4, to War and home again
• The SCR299, Army Communicator United States Army Signal Center, Fort Gordon, GA
• SCR and BC list
• US Army training film featuring K-55 trailer and SCR-299
• Directory of Communications Electronic Equipment
• BC-610 data sheet
• Voice of victory