The LAB1-2240-4 Power Amplifier utilizes a Class A linear power amplifier with a built-in power supply and forced-air cooling system. High efficiency operation is assured by employing a combination of unique microstrip RF networks, low loss hybrid combiners and silicon bipolar devices with the design. Features include load VSWR protection, low distortion and low noise figure. The unit operates in the frequency range 225 to 400MHz with an output of 4 Watts