Hi > On Mar 14, 2017, at 8:49 AM, jimlux <[email protected]> wrote: > > On 3/14/17 5:04 AM, Bob Camp wrote: >> Hi >> >>> The cost difference between a complete oscillator package and a simple >>> crystal is tiny. The osc is often cheaper if you include board space or >>> engineering time. >> >> Purchased in volume, the difference it the price of a crystal vs a complete >> XO >> is enormous. You will see at least a 10:1 cost savings on the crystal and >> likely >> more than that. Simply attaching a crystal to the internal oscillator >> inside a >> chip is nearly zero engineering cost. If your product is cost sensitive and >> not super tight tolerance … you go with the crystal. >> > > And that crystal business (gazillions of inexpensive 16 MHz crystals) is very > different from making an approximately 12 MHz crystal used in a VCXO that > will be FMed and multiplied up by 36 to make a 430 MHz transmitter, oh, and > that matches whatever temperature compensation scheme GE used in 1970.
Well, what GE did in 1970 was to test every single assembly over temperature (multiple times) and pick parts for that specific assembly to compensate it. There never was a magic single crystal design to match the compensation in a given unit …. Bob > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
