Before revision: This prevents changes in the loading presented by the antenna from altering the frequency of the oscillator.Joseph J. Carr Microwave and Wireless Communication Technology, Newnes, 1997 page 339-341 Determining the frequency Fixed frequency systems For a fixed frequency transmitter one commonly used method is to use a resonant quartz crystal in a Crystal oscillator to fix the frequency.
After revision: This prevents changes in the loading presented by the antenna from altering the frequency of the oscillator.Joseph J. Carr Microwave and Wireless Communication Technology, Newnes, 1997 page 339-341 Determining the frequency Fixed frequency systems -=- a fixed frequency transmitter one commonly used method is to use a resonant quartz crystal in a Crystal oscillator to fix the frequency.