I have been looking at some small, simple transmitter circuits (Eg. Mighty Mite) for CW on the HF frequencies around 3-10 MHz using a crystal and LC circuit in parallel. As far as I understand the LC can be used on it's own to produce and oscillation which would work but be sensitive to noise, temperature change, etc, and the crystal provides feedback which helps stabilize the frequency.
I was wondering if the crystal can be used alone, without the LC circuit. Resonating only at the crystals fundemental frequency? Is the main advantage of using the LC circuit together with the crystal to provide a bit more range and the ability to tune or does it also help in other ways?
I was wondering if the crystal can be used alone, without the LC circuit. Resonating only at the crystals fundemental frequency? Is the main advantage of using the LC circuit together with the crystal to provide a bit more range and the ability to tune or does it also help in other ways?