Are "overtone" crystals cut differently than "fundamental" crystals? Or are they just specified differently?
In particular, say I took a garden-variety 20MHz fundamental microprocessor crystal and instead used it at its fifth overtone, trying to hit 100 MHz. The LC network is there to make sure that it's on its fifth overtone. Will this "misuse" mean that the oscillator will be harder to start up, less stable, more noisy, ???, than a crystal oscillator made out of a real overtone crystal? I don't mind if I "miss" 100 MHz by a several tens or hundreds of ppm, as long as it's stable there.
If anyone knows of a place that ships off-the-shelf 100 MHz fifth or seventh overtone crystals, I can avoid this whole exercise.... :-)