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

[Lux, Jim]

On 7/18/22 5:59 PM, ed breya via time-nuts 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
>
MTI-250 is a standard series for Milliren

http://www.mti-milliren.com/pdfs/250.pdf


The catalog (page 20) lists a dozen or so variants (the chart extends to 
Page 21) does give some examples, so maybe you can figure out a pattern?

http://www.mti-milliren.com/pdfs/mti_catalog.pdf


Given that there's a series of 0788, 0789, 0790, 0791, 0792, I'd guess 
the last 2 digits are a sequential number to successive orders or customers.



> 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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