[time-nuts] Re: Looking for OCXO info - MTI 250-0709-B

[Bob kb8tq]

Hi

For most oscillator manufacturers, the OEM numbers are simply 
assigned in sequence. 0709 was the next one after 0709 and the 
one before 0710. It does not relate to anything other than when
(relative to the rest) it was done. The “root number” may or may
not relate to a package size ….

Bob

> On Jul 18, 2022, at 4:59 PM, ed breya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> I've been scrounging around in the OCXO department and found two of these that I likely pulled from something junked out long ago. I found the MTI website, current catalog, model line etc, but of course no mention of this specific version, or anything close, numerically. I can't make any sense of the sub-model numbers, so assume this was a custom version for somebody, or long obsolete. Does anyone know of this particular model version, or if there's a "system" to the sub-model numbering scheme?
> 
> Frequency 10 MHz
> Model 250-0709-B
> Part # 010209-0709
> 
> I believe the date codes are 1997 and 1998
> 
> The notes I made on them say they're +12V powered, which I must have figured out back when I pulled them.
> 
> One thing different about these versus the current ones pictured is they have no screw-plug port to access mechanical/coarse tuning - they're solid all around. It might be that the "-B" suffix deletes this access. I suppose that this could be a good or a bad thing, depending on use. Maybe it's very stable, long term, or maybe it has a very wide EFC tuning range.
> 
> I'm hoping it's an SC-cut, sine out, for lowest available phase noise and utility for my needs. Worst case would be AT, HCMOS, poor phase noise and excessive tuning range, so of course, that's most likely.
> 
> If no info is available, I can fire it up and check the output type easy enough. Also, as I recall, you can tell the cut by the frequency behavior during warm up, but I forget which does which. Any suggestions on how to assess this definitively?
> 
> Anyway, here's hoping there's some actual data available, and it's a good one for my needs.
> 
> Ed
> 
> 
> 
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