The Drake DC-4 is an external DC power supply, converter for
the 4-Line transceivers and transmitters, including the TR-4, TR-4C and TR-4Cw.
Input: 12 VDC (negative ground)
Output: 650 VDC at 300 mA average (500 mA peak)
250 VDC at 175 mA
-45 to -65 Volts DC adjustable bias into 33k Ohms
115 VAC at 600 mA for receiver operation.
Frequency: 330 Hz square wave
Size: 4.25 x 3.5 x 8.5 inches
Weight: 7 lbs.