This is 10M band 27MHz RF Amplifier which based VN66AF MOSPOWER manufactured by Siliconix. VN66AF is an RF amplifier for 10m band frequency (26-30 MHz).
This 27MHz RF amplifier can transform a small transmitters, 200mW for example to be a 2W to 3W 10m transmitters. The band-pass filter attenuates at least 55dB. For linear applications (AM and BLU) the VMOS FET gate current has to be 20mA adjusted with P1. In case you want to apply this 10m RF amplifier circuit for FM and CW, simply adjust variable resistor P1, so there will be no current to FET gate. In our case the repose current (steady current) is about 200mA to 300mA.
Coil specification:
L1 = 12 turns / 0.6mm / 9mm
L2 = L4 = 5 turns / 1mm / 9mm
L3 = 8 turns / 1mm / 9mm
PCB layout design:
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