[time-nuts] Form factor

[Bruce Griffiths]

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
>>>>
>>>>
>>>> _______________________________________________
>>>> time-nuts mailing list -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>> and follow the instructions there.
>>>>
>>>>          
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>>        
>>
>>
>> --
>> =====
>> Chris Albertson
>> Redondo Beach, California
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>      
>
>