[time-nuts] HP E1938
orin.eman at gmail.com
Sat Apr 15 15:34:57 EDT 2017
There's a link on the second ebay auction page:
On Sat, Apr 15, 2017 at 10:42 AM, Larry McDavid <lmcdavid at lmceng.com> wrote:
> Ok, so a standard DB 25-pin socket-contact connector will mate with the
> on-board connector with the center hole and missing pins. That's good!
> I now notice a comment on your webpages about this device in which you
> mention a schematic. Do you have a schematic of this board? If so, can you
> point to it or send me a copy.
> I was unaware of the complete packaged unit on eBay; thanks for that.
> Another poster mentioned the wiring of the connector on the full
> instrument version power connector; is that pin-out and spec available?
> On 4/15/2017 5:05 AM, Tom Van Baak 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
>> 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/290829
>> 077542 -- 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.
> Best wishes,
> Larry McDavid W6FUB
> Anaheim, California (SE of Los Angeles, near Disneyland)
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