For a crystal to operate at its specified frequency, the electronic circuit has to be exactly that specified by the crystal manufacturer. Note that these points imply a subtlety concerning crystal oscillators On this frequency assortment: the crystal will not normally oscillate at exactly both of its resonant frequencies. SPXO https://ledbookmark.com/story4646278/5-tips-about-smd-crystal-oscillators-you-can-use-today