This amplifier is useful for applications where a 10- to 15-W peak-envelope-power (PEP) signal is needed in the 420- to 520-MHz range. C1,C2,and L1 form a matching network for amplifier Q1. L3,C3, and C4 form an output matching network for a 50 ohm load.

L2,R2,D1,and R3 through R6 (with bias adjust R1) form a biasing network for Q1. D2 and D3 provide polarity protection for Q1,which must be heat-sinked.

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