[Photo] 0.8W 21MHZ CW QRP transmitter

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0.8W 21MHZ CW QRP transmitter


This circuit has an actual measured output power of 0.6-0.8W, harmonic suppression up to 40dB, frequency variable range of about a dozen KHz (related to the characteristics of the crystal used), and power consumption of about 200 mA.
In the picture, L1 and L2 use common color-coded inductors, and L3 and L4 use the commercially available 5 mm diameter M4 core. After buying it, remove the original wire as long as the skeleton, and wrap it around ten times with an enameled wire of about 0.3 mm. Tr is 10 × 10 mm mid-periphery, with 10 turns around the center tap and 3 turns around the secondary. As long as there is an oscilloscope, this circuit is easy to install successfully.

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