[time-nuts] Salvaged OCXO by ar electronique

[Bob kb8tq]

Hi

If you have not already spotted a Vref pin on the unit, your magic 
8V pin may be the Vref for the EFC. It also could be “factory use only /
do not connect “. 

There are OCXO’s on eBay in the < $30 range that should do about as
well as what the spec sheet shows for the part you have. The unanswerable
question is of course “which ones?”. As noted in many posts sorting
through this and that to find a good part is never easy.

Bob

> On Apr 30, 2020, at 3:27 AM, Andreas Seltenreich <seltenreich at gmx.de> wrote:
> 
> Hi,
> 
> I recently bougnt two used DVB modulators by Teamcast for salvaging
> parts.  There were a couple Mini Circuits VCOs, mixers and filters in
> them as well as a 300Msps DAC and a beefy FPGA.  But the most treasured
> part for now is an OCXO (my first one!) labelled:
> 
>    ar electronique micrOSTAR-FB 509 A 10 AR1275
> 
> My usual searching the list archives on time related parts didn't turn
> anything up.  I'm having a really hard time to find a data sheet for it.
> A mail to the manufacturer remains unanswered. The closest I could come
> to one is this Product matrix:
> 
>    http://www.ec-m.it/docs/OCXO.pdf
> 
> This reveals some marketing specs and also that it is a 12V-supply-only
> part, but no pinout or ratings.
> 
> I got the OCXO running by analyzing the PCB a bit, which is not that
> easy because it appears to have infinite layers and I'm getting blinded
> by the gold plating.
> 
> However, there is one pin left which measures open on the PCB and 8V
> when leaving it unconnected.  Maybe I'm supposed to buffer that? I also
> still have no idea how regulated that single-supply must be or what load
> it expects on the 10MHz output…
> 
> I'm having a hard time finding these answers myself since this is the
> most stable oscillator in my shack by far and I can't really measure
> what happens when wiggling the unknown PIN or the 12V, or changing the
> load on the output.  Any input appreciated!
> 
> regards,
> Andreas
> 
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