[ARC5] DC11 or DC11AA crystal holder dimensions?

[Tom Lee]

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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