BC-611 ARMY RADIO RECEIVER DAMAGED AS IS
The operator pulled out or pushed in the antenna on the top to turn the radio on or off, respectively. The power was supplied by a BA-37 1.5 volt dry battery for the filament supply and a 103.5 V BA-38 battery for plate supply.[4] Battery life was about one day of normal use. 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 on any one of 50 channels. Plug in crystals and coils were used to control the frequency of the receiver and transmitter. The antenna was a 40 inch telescoping rod that slid into the case. 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.
