RF Preamplifier by 2N2219a , 2N4427 , 2N3553

Input needs only several mWatts (e.g. BF900) -> 300 mWatts OUT. This schematic is a often used buffer. It’s easy to build, clean and cheap. When you want even more power, you can replace the 2N2219a by a 2N4427 or 2N3553. You can lower the output by adding a little resistor (10..47 Ohm 1/2W) in the emitter line of the 2N2219a.

Read More Source:
http://www.pulsarfm.nl/buffer1.htm
Thank You.

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RF Preamplifier by 2N2219a , 2N4427 , 2N3553