[R-390] Crystal Oscillator Identification .

[Bob kb8tq]

Hi

If the gizmo is a round can like the R-390A uses for the calibrator crystal, it’s simply a crystal oven. It may or may not have a crystal in 
it at the moment. The basic device was made by the millions over several decades. Lots of devices used them. Lots of products incorporated
them. Until things like TCXO’s and OCXO’s came along, they were pretty much “the only way” to do reasonable stability in a normal 
piece of gear.

Bob

> On May 29, 2018, at 5:58 PM, W4QG <w4qg at cfl.rr.com> wrote:
> 
> All,
> Please excuse the somewhat off topic post.
> 
> I came across a pair of crystal oscillators at the Hamvention in a box of miscellaneous 390A parts.
> Almost no information on the net about them except for a NSN number and they appear to be made by Collins. Similar to 390(A) oscillators but definitely not identical.Info I found on the net indicates the NSN was applied for in 1963.
> 
> NSN 5963-00-503-2533
> Nomenclature on the module is:
> "Crystal Oscillator Unit
> 506 2641 003
> S.W.E G-573071
> SERIAL NO 3515"
> 
> Whatever it is, it would appear at least a few thousand were made. I couldn't find any info on the next higher assembly. I do have pictures if anyone is interested.
> 
> Anyone have a clue what radio this is from?
> 
> Thanks!
> 
> 
> 
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