20W broadband HF/6M 1-55MHz RF power amplifier


20W HF/6M broadband RF power amplifier

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This custom designed HF broadband QRP amplifier intended for field or mobile operations or as driver for LDMOS amplifier. This amplifier produced from high quality ORIGINAL parts, such as pair RD16HHF1 (or RD15HVF1) Mitsubishi transistors, OPA2674 IC and AMIDON cores. PA’s PCB mounted on metal basement for good heat dissipation.  PA has very flat frequency response. 


Nominal power supply is 24v

Nominal current is 1A

Maximum current is 3A

Idle current is 0.4A (adjustable)

Input frequency 1-55mHz

Input and output impedance is 50 Ohm

Nominal input power is 0dBm (1mW)

Maximum input power is 4dBm (2.5mW)

Nominal output power 40dBm (10W CW)

Maximum output power is 43dBm (20W CW)

Measured IMD3 perfomance is -33dB for nominal power

Board size is 120x75mm

Additional information

Weight 0.37 kg


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20W 24v RF power amplifier schematic


20W 24v RF power amplifier wiring