Sounds better however I don't know if it exists in English. Obviously the line is referring to frequency synthesizer based on quartz oscillators... "quartz-controlled" exists as a word (check out this website http://www.classle.net/bookpage/frequency-synthesizer-0 ).
Would "Activate quartz-controlled frequency synthesizer" work? Doesn't it sound too long? Or maybe "quartz-based"?
Any electronic components expert around here guys?