The ALC module uses digital control to level the RF signal output of amplifiers from 1 to 50 watts. By continuous monitoring, the ALC adjusts the input of the amplifier to maintain a constant output level, leading to an improved amplifier performance. The ALC module can also be combined with an RF synthesizer to create an inexpensive signal generator with adjustable output levels. Modules are available to operate in bands between 800 and 3000 MHz. Output signal power is set and can be monitored by a RS 232 serial link.