[time-nuts] Special connector for Symmetricom X72 rubidium standard

Bob kb8tq kb8tq at n1k.org
Mon Aug 21 15:34:23 EDT 2017


A lot of the OEM’s seem to be going with a large multi layer PCB as the “heatsink” for 
the lightweight Rb’s. Apparently they have enough airflow through their racks that this
works ok for them. In that case, I think I’d prefer some sort of “cheap”  SMD PC mount 
connector. Faster to assemble that way …..those nickels add up quick :)


> On Aug 21, 2017, at 10:56 AM, Mark Sims <holrum at hotmail.com> wrote:
> I'm going to buy enough boards to get them for a decent price... way lower than you can have them built for.  Will also probably do them with a kit of parts.
> RDR Electronics has SA22's for not much more than the X72.   The problem with SA22's is the connector.  It is a dual row 18 pin connector with 2mm pitch.  It is on the bottom of the box where you want to mount the heatsink.   Not sure how one would mount it so that the full surface is on the heatsink.   It looks like they use a mating SMD PCB mounted connector.
> ---------------------
>> So if he had finished his board I would be happy to 
> get the sources to get some ordered at my local PCB manufacturer.
> I think that brings the best options for future use of the X72 
> oscillator which seems to be a very good small rubidium oscillator 
> nowerdays. SA22.c oscillators are not so spread over the known used-item 
> reseller sources and if yes they are quite expensive to buy.
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