>BTW, I wanted to use a 1Mhz on the petfeeder, but the
>odd thing is that digikey lists these for $7+ ea, while
>131.072khz, and 4MHz crystals are approx $2 ea.

I believe there is manufacturing hassles at around the 1MHz area. I am not
really sure what they are, but I suspect that it is a point where you cross
between two different modes of operation of the crystal physical vibration.
I remember when the HF Marine bands went to SSB the company I worked for
designed a receiver using a 1.4MHz filter, and had a horrible job getting
crystal filters for it, because the crystals were right in a difficult to
process frequency range.

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