Colpitts Xtal Osc / Class E Power

From 2007 Amateur Radio magazine, full article from the index in Week 3. The oscillator is a Xtal Colpitts, then two digital inverters driving a BUZ90A Mosfet in Class E (saturated and off). Note the Amplitude Modulation transformer which is only a 240:30 Volt power tranny, in series with the drain circuit of the BUZ90A.
The transmitter is designed for 1.8MHz (just above the AM broadcast band).
1.8MHz transmitter
Full Size image in New Page


MAP

Top