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CTI OCXO type OSC5A2B02

 

does anyone know if these ( cCTI OCXO type OSC5A2B02_can work at different frequencys if the internal crystal is swapped for a different freq item?.
wn4isx
 

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.
?
 

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.
?
wn4isx
 

On Sat, Feb 15, 2025 at 09:42 AM, Sam Reaves wrote:
I don't remember if they are square wave or sine wave but you could filter the square to a sine if needed.
Epson offers sine, triangle and square wave, though not all waveforms are available on all models.
They have reasonably low phase noise, I wouldn't want to use one for a VHF digital data mode, but for most applications they are very good.
?
Turn around time is 1 to 2 weeks.
?
I've used these in a variety of projects and never been dissapointed.
?
 

On Saturday 15 February 2025 11:26:30 am wn4isx via groups.io wrote:
I've used these in a variety of projects and never been dissapointed.
I don't know specific numbers offhand, but I have a whole pile of those "canned" oscillators in various frequencies. The kind where you plug 'em into an IC socket. I assume that two opposite corners are for +5v and ground and one of the two remaining pins is the output. I'm also assuming that most of these put out a square wave, though I haven't checked.

What kind of things do you find those useful for? Most of the ones I have are NOS, but I've pulled a few off of MBs and ISA video cards.

--
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