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Four huge vans comprise the modern "TV station on wheels" developed by RCA for the U. S. Army Signal Corps. "TV Station on Wheels" for Arm y . HE most complete television station ever mounted on wheels has been constructed for the U. S. Army Sig- nal Corps by engineers of the Radio Corporation of America, and delivered recently to the Signal Corps' Fort Monmouth, N. J., Laboratories. The mobile television caravan, which was built in close cooperation with Signal Corps engineers, consists of four special 10-ton trucks, each 31 feet long. Two of the trucks are fitted with a complete line of TV trans- mitting and monitoring equipment, three TV field cameras, ten receivers, a large-screen TV projector which will show life-size pictures, and a radio intercommunica- tion system. The other two trucks contain power supply generators. The caravan will be used to explore the feasibility of television for field instruction, and to develop in- structional techniques via TV. The equipment may prove extremely valuable in televising intricate field exercises and "piping" the picture to expert observers, maneuver umpires, or to classrooms. Programs picked up in the field, will be "piped" to military classrooms, or to a broadcasting station, by microwave radio link or coaxial cable. If they go to a broadcast station, the programs will then be transmitted in the usual manner; if they are conveyed to class- rooms, the programs will be carried to a mobile display unit equipped with both direct-view and projection-type television receivers. The first vehicle in the television fieet is equipped with three complete TV field camera chains, a micro- wave transmitter for video signals, and a 46-watt FM transmitter for transmitting sound signals. Associated monitoring and switching control equipment is utilized in accordance with standard TV broadcast practice. Four microphone inputs, and tape and disc recording equipment — all with latest amplifying units — are among the audio facilities. The unit also houses a sepa- rate monitor-announce position, and an order-wire radio communication system, utilizing an RCA 15-watt Car- fone two-way mobile installation. The custom-built body of the vehicle houses a com- plete transmitting studio, which is equipped with a specially-constructed operating desk for portable moni- toring, control and power supply units used with the TV field cameras. All equipment is shock-mounted to guard against damage, including lockers provided for transporting the cameras, tripods, cables, and transmit- ting units. The operating desk is mounted in the rear of the unit, facing large shatterproof glass windows which give a clear view of pick-up activities outside. The roof of the truck is reinforced to support the weight of both equipment and operators when they 28 RADIO AGE