[time-nuts] Form factor

[bownes]

That would all depend upon the interconnect strategy, which hasn't reached consensus either. 

Based on the early module list, a bus probably isn't necessary, and individual ribbon cable and/or coax will do if speeds stay low. 



On Dec 21, 2010, at 2:34 PM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:

> Another factor to consider is that ps stability requires using coax connectors that are mechanically stable to within a few microns ie no BNCs.
> 
> Bruce
> 
> Don Latham wrote:
>> I agree about the ebay finds. Bad to design the boards form factor around
>> old chassis.
>> Maybe the thing is to find out from the electronic design how big the
>> board(s) will have to be or what the electronic footprint is, then go from
>> there? If the boards are designed so that idiosyncratic mounting is
>> possible, we can all mount them according to our own taste?
>> 
>> Don
>> 
>> Chris Albertson
>>   
>>> You can't plan a project like this around eBay junk.  How would you
>>> assemble
>>> 100 kits if each kit requires that you find a specific HP instrument on
>>> eBay?
>>> 
>>> If cost is a big issue then I'll go back to my first idea.  Make your PCB
>>> about
>>> the size os a disk drive.  Then yu get a llength od 1 x 1/4 inch aluminum
>>> L
>>> and bend it into a three sided "U" and attach it to three sides of the
>>> PCB.
>>> 
>>> The finished assembly should fit into any enclusre designed to hold SATA
>>> disk drives.  A PC case could work but there are nicer looking boxes, rack
>>> mount and diesktop
>>> 
>>> This trades a bit of metal working for the cost of a Hammond box.  But
>>> the metal work requires only a hack say and drill.
>>> 
>>> 
>>> 
>>> On Tue, Dec 21, 2010 at 8:35 AM, Bob Bownes<bownes at gmail.com>  wrote:
>>>     
>>>> I do the same with Tek 500/500series instrumentation plugins. You can
>>>> get
>>>> the TM504 mainframe for<  $50 on ebay and scrap grade modules for<  $10.
>>>> Plus you get a linear power supply, backplane and already RF rated
>>>> enclosure.
>>>> 
>>>> On Tue, Dec 21, 2010 at 11:12 AM,<EWKehren at aol.com>  wrote:
>>>> 
>>>>       
>>>>> Hi
>>>>> One source of boxes to consider is old HP equipment, some is very
>>>>> reasonably priced, like 37203 for small boxes and a 59401A makes an
>>>>> ideal
>>>>>  housing
>>>>> for a Rb with clock GPS and backup power. Some times you can even use
>>>>>  part
>>>>> of the guts. I even went as far as repackaging my 5062C into a HP case
>>>>> of
>>>>> that generation, heresy in the eyes of some of you
>>>>> Bert Kehren   Miami
>>>>> 
>>>>> 
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>>>>>         
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>>> 
>>> 
>>> --
>>> =====
>>> Chris Albertson
>>> Redondo Beach, California
>>> 
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>>>     
>> 
>>   
> 
> 
> 
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