Looks like Mouser has a 4.8mhz Ceramic Resonator, which would put it at 7200khz.?
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?and also a 4.75mhz xtal to put it at 7225khz:
Not a lot of wiggle room with a crystal but you could get between 7222 and 7225 with a trim cap.The frequency would at least be "rock solid" if you'll pardon the pun.
