[time-nuts] HP E1938
bruce.griffiths at xtra.co.nz
Sat Apr 15 08:41:03 EDT 2017
#1 proved useful when this sub assembly failed (no 10MHz output) in my E1938A.
Someday I'll disassemble it to see what exactly failed.
Also have #3 which works well when one figures out the connections on the PCB and the unusual backplane connector.
> On 16 April 2017 at 00:05 Tom Van Baak <tvb at LeapSecond.com> wrote:
> > >
> > I purchased one of these HP E1938 OCXO recently on eBay but have not yet
> > received it.
> > Is that special D-Submin connector a receptacle-shell, pin contact
> > version? Will a standard plug-shell, socket contact 25-pin D-Submin fit it?
> > >
> I'll cc the group here since we may get some useful comments.
> I'm not exactly sure what you mean. The E1938A oscillators that I've seen and tested look like this:
> And those can be interfaced with a simple D-sub DB25 connector on the PCB. For connections, see that page, or any number of postings about the E1938 in the time-nuts archives.
> Note that on eBay there are at least three variations of E1938A oscillator. The item#'s below are just random search picks (I have no affiliation with any buyers or sellers) and I also know not all surplus refurbished surplus recycled surplus stuff works. But we do this because when they did work, they are sometimes totally amazing.
> 1) There's the bare "puck" alone, as in http://www.ebay.com/itm/290829077542 -- and I have no idea where one would start with that item since all the support circuitry on the PCB would have to be re-created by hand.
> 2) There's the integrated PCB assembly, as in http://www.ebay.com/itm/181043193416 -- which is more like what I tested.
> 3) There's the full instrument version, as in http://www.ebay.com/itm/171293069062 -- which is most likely to work, or be less hacked up, or dented, or salvaged, or rusted. It even has all the connectors and power supplies, and GPS, etc.
> If any other time nuts have experience with each of these methods to obtain a E1938 oscillator, please let us know.
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