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Re: CTI OCXO type OSC5A2B02

 

The crystal in these has a very special cut (SC? IIRC) that has a temperature curve that is very flat in the operation area as compared to the commonly available AT cut. The parabolic curve slope broadens out as compared to the AT. This way the oven temperature control does not have to control the temperature quite as precisely to achieve?the desired results. Perhaps if you could get the appropriate crystal and knew the?oven operating temperature?it could be made to work. They are outstanding 10MHz OCXO's?if?you don't get one where the crystal has aged out of EFC range.

There are programmable oscillators available from Digi-Key that they will program for you to a specific frequency. I think SITime makes them. I don't remember if they are square wave or sine wave but you could filter the square to a sine if needed.

Sam

Sam


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On Sat, Feb 15, 2025 at 8:07?AM wn4isx via <wn4isx=[email protected]> wrote:
A friend tried this and the answer is .... Nope.
Opening the sealed metal case is a challenge, Joey destroyed 4 before he succeeded with number 5.
Everything inside is supper small surface mount, including the crystal. And they don't use lead-tin solder, probably used silver solder.
?
What frequency do you need?
Is there anyway to get it with a divide by chain or device by chain with a PLL with divide by chain for multiplication.
For instance, I needed 60Hz, so I divided down to 20Hz, used a PLL with a divide by 6 in the loop to multiply by 6 to get 120, followed with a divide by 2 to get 60Hz.
?
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