ENI Model ACG-3 RF Power Generator 30W - 300W, ACG-3LP2 - Made in USA

Power Supply 

The Power Supply provides unregulated DC voltage (approximately 40-48 volts) to the RF Chassis Assembly. The circuit is a single phase full wave bridge rectifier, capable of an output current of 15A. The main power transformer has primary winding taps that allow the unit to accept line voltages of 100-120VAc and 200-240VAc. Both sides of the AC Line are fused and a double-pole contactor provides disconnection from the mains within the unit. Initial set-up is aided by a line voltage test that allows the unregulated DC voltage to be read on the power output meter. The power supply also provides bias voltages to the control board. 

The main power transformer has two center-tapped secondary windings. Both windings are rectified by separate full wave bridge rectifiers and provide outputs of (+) and (-) 1W. One is referenced to the unregulated DC for biasing the current sensing circuit on the control board. The rectifiers and regulators are located on the control board. A +25 V regulator is located on the RF Chassis Assembly for biasing of the driver amplifier. This regulator is fed from the unregulated supply voltage. An ENI-1 transistor regulator is used for high reliability. 

RF Section 

The RF Amplifier Module consists of a Driver Amplifier assembly, Power Amplifier, VSWR Bridge Assembly, Driver Regulator, and the Harmonic Filter. The Driver amplifies the OdBm RF output from the control board to about 20W to drive the power amplifier. This is a Class A, linear driver with the first two stages operating from the regulated +25 V. The output stage uses the unregulated DC for the collector supply while the base bias is taken from the regulated +25V. The Power Amplifier operates in push-pull Class B mode and is feedback-stabilized for operation into high VSWR loads without spurious oscillations. Collector bias is unregulated DC at 13.0 A maximum (limited by circuitry on the control board). The resistor used for current sensing is located on the Power Amplifier. The VSWR Bridge Assembly senses the forward and reverse power simultaneously and provides DC outputs to the control board for monitoring and protection functions. These DC levels are applied to a voltage squaring circuit on the control board so that all control and interface functions are linear and directly proportional to power outputs. The VSWR Bridge was designed specifically for the ACG-3 and has a residual null reading of less than 1W at full output into a 5012 load. The harmonic filter is a seven-section Chebyshev design using high voltage capacitors for reliable operation into high VSWR loads. The filter insures that all harmonics from the power are more than 55dB below the fundamental. 

Condition:

• AS IS government surplus item. 
• Untested due to incompatible power plug.
• Picked up from laboratory environment. 
• Photos represent the exact item that will be shipped. Please refer the photos.

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