[ARC5] DC11 or DC11AA crystal holder dimensions?

[Tim]

Hi Tom  - C Clamp?  Oh Ouch!!  But they can also be used as a metric
crescent wrench.....
I wonder if I can calibrate my 6" bench vice in microns per degree of
rotation....might come in handy!  LOL
Cheers -
Tim
N6CC

On Thu, Nov 18, 2021 at 11:20 AM Tom Lee <tomlee at ee.stanford.edu> wrote:

> I agree with your analysis—I’m sure that a combination of age and
> manufacturing tolerances accounts for the two hair-diameters difference.
>
> I’m impressed by the precision with which you made the measurements! I
> have three rulers on my bench and they visibly disagree. I do have a
> micrometer but it was once used as a C-clamp.
>
> Cheers
> Tom
>
> Sent from my iThing, so please forgive brevity and typos
>
> On Nov 18, 2021, at 10:53, Tim <timsamm at gmail.com> wrote:
>
> Hi Tom - yes, that was a surprise....(I have a very good dial indicator
> that I trust).  I have not disassembled this crystal but I note that the
> pins have hex "nuts" at their base implying they are threaded into the
> bakelite case from the outside.  So there may be room for some "slop";
> bakelite machining being somewhat non-precise.  I don't know what the pin
> spacing tolerance spec may be.
> I only have this 1 crystal so my sampling statistics are pretty poor!  But
> I am sure a "3/4" socket will be the way to go.  BTW this crystal fits
> nicely in the "big" crystal sockets on the GRC-109/RS-1 transmitters too.
> (Why?)  haha
> Tim
> N6CC
>
> On Thu, Nov 18, 2021 at 10:41 AM Tom Lee <tomlee at ee.stanford.edu> wrote:
>
>> Hmm...nine mils greater than 3/4"?
>>
>> Sent from an iThing, so please forgive the terseness and typos.
>>
>> On Nov 18, 2021, at 10:27 AM, Tim <timsamm at gmail.com> wrote:
>>
>> Hi Steve - correction on the "pre-coffee" ! spacing measurement:  This
>> DC-11-E crystal example is just slightly over 3/4" spacing.   (0.759")
>> Pins are 0.125 diameter...
>> Tim
>> N6CC
>>
>> On Thu, Nov 18, 2021 at 7:50 AM Steve WD8DAS via ARC5 <
>> arc5 at mailman.qth.net> wrote:
>>
>>>
>>> Thank you Tim!  7/8" spacing is one of the dimensions I've seen
>>> reported.
>>>
>>> Last night I finally found one DC-11A crystal in my stash and the pins
>>> were the same 1/8" as yours but the spacing was closer to 3/4" (but did not
>>> seem to be exactly 3/4, so maybe it is 13/16?
>>>
>>>
>>> Steve WD8DAS
>>>
>>> sbjohnston at aol.com
>>> http://www.wd8das.net/
>>> http://af4k-crystals.com
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>>>
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