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?
Larry
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 it?
Hi,
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:
http://www.leapsecond.com/museum/e1938a/
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.
--
Best wishes,
Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
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