70MHz RF FM Power Amplifier

This 70MHz rf power amplifier circuit uses the SD1143 transistor which provides a gain of about 14dB in this design. It uses the fact that a 175MHz device has a much higher gain when used at lower frequencies. The amplifier was originally designed to be used with a transverter. The output is 8 to 10W for a 300 to 500 mW input power. Unfortunately, we dont have the coils values. With a few modifications you can use this amplifier for different frequencies.

70MHz power amplifier circuit diagram


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