[R-390] Crystal Oscillator Identification .

[W4QG]

Hi Bob,
No, its not like the oven. Its like the main oscillator assembly.
23 crystals installed. I should have been more clear that it is not a 
calibrator crystal but a whole assembly.
Thanks for the response and 73,
Paul

On 5/29/2018 6:19 PM, Bob kb8tq wrote:
> 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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>