What performance can be expected from a crystal resonator?

Good quality ‘amateur’ VHF overtone crystals will typically be within 1 part in 105 of their calibrated frequency over 0 – 30°C.
Even spending a fortune won’t get you better than 1 part in 106!
Poor oscillator design can wreck the performance of even the best crystal.

Good quality ‘amateur’ VHF overtone crystals will typically be within 1 part in 105 of their calibrated frequency over 0 – 30°C.