Circuit - 7MHz trasmitter - CQ Ham Radio July 2009

You can look at the circuit diagram of 7MHz trasmitter on the July issue of CQ Ham Radio in 2009. The collpits oscillator generates the 7MHz signal and the PA stage increases the RF power to 200mW with 2SC1815GR. The LPF consists of two coils and three capacitors. There is the full break-in capability with 2SA1015GR (PNP transistor) .

The VXO with the 20pF capacitor can move the frequency between 7.000MHz and 7.003MHz.