Specifications
The SCR-536 incorporated five vacuum tubes in a waterproof case. There was no power switch on the SCR-536.. The SCR-536 weighed 5 pounds with batteries and 3.85 lb without batteries (2.3 and 1.75 kg). The unit operated in AM voice mode between 3.5 and 6.0 MHz frequency range. The SCR-536 had an RF output power of 360 milliwatts. The range of the unit varied with terrain; from a few hundred feet, to approximately one mile over land, and 3 miles over water. The short range is accounted for by the short antenna: on transmit it shows a low radiation resistance, so it couples to free space with low efficiency. The same is true on receive, with an alternative explanation: the shorter the receiving antenna, the less energy it can intercept ("collect"), and therefore deliver to the receiver.
Under the Army Nomenclature System, the BC-611 transceiver was the core component of the SCR-536 Signal Corps Radio set. The Signal Corps technical manual number was TM 11-235.
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