[time-nuts] Upgrading TS2100 from TCXO to OCXO

Greg Broburg semiflex at comcast.net
Sat Mar 26 05:14:03 UTC 2011


I have MTI 240 OCXOs

Greg

On 3/25/2011 10:02 PM, Robert Watzlavick wrote:
> Ok, thanks.  I was so focused on the IRIG and 10 MHz parts I didn't
> think about the NTP function (which is what the unit is for after all).
>
> BTW - I had some misinformation in my original post.  The Abracon
> AOCJY1A is probably pin compatible with the TS2100 but it's not voltage
> compatible.  The OCXO supply voltage on PC board pads is 12 not 5
> volts.  So unless I can get the same MTI 240 OCXO, then I'm looking at
> just putting one in the case somewhere and running wires to it.  I'd
> prefer not to cut traces.  Anybody know of an inexpensive OCXO that
> meets the following criteria?
>
> 10 MHz sine output
> 12V or 5V supply voltage (either will work since it will be installed
> off board)
> 5V EFC (TS2100 DAC is 0.5-4.5V)
> Small enough to fit in a 1U rack enclosure (the Morion MV89A is too tall)
>
> I'm not striving for perfection, just some that is significantly better
> than the stock TCXO.
>
> -Bob
>
>
>
> On 03/25/2011 02:11 AM, Hal Murray wrote:
>>> Not sure what the "precision" setting is for (it's currently -19).
>>>
>> That's probably for NTP.  Roughly, it's how many useful bits of data you get
>> when you read the clock.  I can probably find a description if anybody is
>> curious.
>>
>> -19 is 2 microseconds which is a reasonable ballpark for an embedded system.
>>
>>
>>
>>
>>
>
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